roteiro - sefidvash.nethistory of nuclear energy 1942 first nuclear reactor. enrico fermi in...
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Version 14/07/2009
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FBNR Workshopwww.sefidvash.net
Farhang [email protected]
Federal University of Rio Grande do SulPorto Alegre, Brazil
Fixed Bed Nuclear Reactor
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History of Nuclear Energy
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History of Nuclear Energy
1942First nuclear reactor. Enrico Fermi in Chicago.
1945 Hiroshima & Nagasaki bombs. UN is born in San Franciso.
1946 UN forms UN Atomic Energy Commission (UNAEC).
1949 Soviet’s first nuclear weapon test.
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History of Nuclear Energy continue1952
UK first nuclear weapon test. US hydrogen bomb test.
1953Atoms for Peace program.Calling for the formation of IAEA.
1954World’s first nuclear power plant in Obninsk.
1955 Formation of IAEA.
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History of Nuclear Energy continue1956
In New York 82 countries approve the IAEA Statute.1957
IAEA officially comes into existence. NEA of the OECD was established. Sputnik-1 is launched.
1958Ireland raises the idea of nuclear non-proliferation.
1959First civilian nuclear powered ship “the Lenin” is built.
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History of Nuclear Energy continue
1960France’s first nuclear weapon test becoming the 4th.
1961Eklund becomes the IAEA Director General.
1962Cuban missile cricis.
1963Ban on nuclear tests in the atmosphere, underwater and in outer space.
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History of Nuclear Energy continue
1964FAO is formed. ICTP is formed. China tests a nuclear bomb becoming the 5th.
1967Tlatelolco Treaty (TT): ban nuclear weapon in Latin America.
1968Nuclear Non-Proliferation Treaty (NPT) open for signature.Nuclear weapon states: US, Russia, UK, France, China Mexico becomes first country under IAEA safeguard according TT.
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History of Nuclear Energy continue
1969Apollo mission place an atomic generator on the moon.
1970IAEA forms a safeguard committee under Kurt Waldheim.International Nuclear Information System (INIS) is formed.
1971Finland becomes the first country to sign NPT safeguard agreement with the IAEA.
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1972International Maritime organization (IMO) bans sea dumping of wastes.
1973Organization of Petroleum Countries (OPEC) quadruple the price of oil.
1974India conducts “peaceful nuclear explosion”.
1975NPT countries reach 91.
1976IAEA with WHO establish global network of dosimetry laboratories.
History of Nuclear Energy continue
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1977In Vienna, the International Nuclear fuel Cycle Evaluation (INFCE) assess problems of peaceful uses of nuclear energy.
1978US puts restrictions on exports of nuclear technology.
1979Three Mile Island (TMI) accident.
1981Israel atacks the French built Tamuz research reactor in Iraq.Hans Blix becomes the Director General of IAEA.
History of Nuclear Energy continue
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History of Nuclear Energy continue
1982ARCAL for promotion of nuclear science and technology in Latin America is formed.
1983IAEA conference held in Seattle declares that the technology for the safe disposal of radioactive materials exists.
1984China joins the IAEA.
1985Gorbachev & Reagan meet agree on fusion machine ITER under IAEA.
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History of Nuclear Energy continue1986
Chernobyl accident.
1987China gains a seat on the IAEA Board of governors.Goiânia radiological accident.
1988The IAEA, FAO & others join forces to eradicate livestock disease screwworms in Libya.
1989Berlin Wall falls.For the first time USSR issues a public report on the 1957 radiological accident in Kyshtym.
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History of Nuclear Energy continue
19904th NPT Review Conference takes place in Geneva.Brazil and Argentine declare common nuclear policy under IAEA.AFRA enters in force where African countries join in nuclear research programs.
1991USSR is dissolved.Gulf War due to invasion of Quwait by Iraq occurs. China & France declare intention to sign NPT.
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History of Nuclear Energy continue1992
The “Earth Summit” meets in Rio de Janeiro and adopts Agenda 21 calling for sustainable development.UN Security Councils declaration on weapons of mass destruction.North Korea signs NPT.
1993IAEA strengthens the safeguard program.
1994The states adopt the International Convention on Nuclear Safety, which is the first global legal instrument binding the countries to basic safety standards for land based nuclear power plants.
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History of Nuclear Energy continue
1995NPT is indefinitely extended.
1996The UN General assembly approves the Nuclear Test Ban Treaty.
1997Mohamed ElBaradei becomes the General Director of IAEA after Hans Blix.Kofi Annan becomes the UN Secretary General succeeding Boutros Boutros Ghali.Kyoto Protocol is formulated.
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History of Nuclear Energy continue1998
India and Pakistan perform a series of nuclear tests.
1999The world’s first geological repository for disposal of nuclear waste opens in USA.A criticality accident occurs at a fuel conversion plant in Japan (Tokaimura).IAEA helps solving Y2K Bug problem.
2000Sigvard Eklund passed away.Hans Blix is appointed to head the United Nations Monitoring & Verification Commission (UNMOVIC) for Iraq.
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History of Nuclear Energy continue2001
9/11 terrorist attack in USA.ElBaradei is appointed to a second term as IAEA Director General.Kofi Annan is reappointed to a second term as Secretary-General.
2002US & Russia sign a nuclear arms treaty to reduce their respective nuclear aresenals.Cuba signs NPT.
2003North Korea withdraws from NPT.Iran becomes under suspect.Libya announces dismantlement of its weapons of mass destruction (WMD) program.USA commemorate the 50th anniversary of the “atoms for peace” proposal in December 1953 that lead to the IAEA’s creation.
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History of Nuclear Energy continue2004
The need for a single set of international standards for nuclear power plants is endorsed by safety experts from 37 countries meeting in Beijing.
2005Nobel Peace Prize is given to IAEA & its Director General.ElBaradei appointed to a third term as IAEA Director General.A new IAEA Board resolution for Iran abandon uranium enrichment. A US & India agreement.France is selected to host the US $10 billion ITER project on nuclear fusion.
2006Ban Ki-moon becomes the 8th Secretary General of the UN. Nuclear test done by North Korea.UN Security Council imposes sanction on Iran.
2007IAEA’s 50th birthday on July 29th.
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Fundamentals Point of view of an engineer
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Structure of an atom
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ZXA
A = Atomic Mass (Z+N)Z = Atomic Number (number of protons)N = Number of Neutrons
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Isotopes
The same element (same Z) having different number of neutrons (N).Have the same chemical properties but different physical and nuclear properties.
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Common Nuclear Fuel
Natural Uranium = 0.7% 92U235 +99.3% 92U238
Enriched Uranium = e% 92U235 +(100 - e)% 92U238
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Fuel Enrichment by Centrifugal Method
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Questions
How do you transform copper (29Cu64) into gold (79Au197) ?Can you enrich uranium by a chemical process?
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Change Copper into Gold
3 29Cu64 + 21 n 79Au197 + 8O16 (Fusion)
92U235 + n 79Au197 + 13Al27 + 12n (Fission)
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Neutron Energy
E = ½ m v2 , m =1.67e-24 gr ; ev=electron voltThermal neutrons 0 < E < 1 ev
V = 2200 m/sec = ~ 1/40 ev
Thermal neutrons V =~ 8000 Km/hrFission neutrons ~2 Mev =~ 9000 X 8000 Km/hr
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Questions
What is the velocity of a neutron having 1ev energy ?What is the velocity of a neutron having 1Kev energy ?What is the velocity of a neutron having 1Mev energy ?
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Macro to Micro
The nuclear field works with very small and very large numbers at the same time.Let us get a feel for large and small numbers.
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.
ZOOMZOOM
POWER OF 10
FROM MICRO TO MACROCOSMOS
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This is a trip at high speed, jumping distances by factor of 10.
Start with 100 equivalent to 1 meter, and increasing sizes by factor of 10s ,or 101 (10 meters), 102 (10x10 = 100 meters, 103 (10x10x10 = 1.000 meters), 104 (10x10x10x10 = 10.000 meters),
so on, until the limit of our inmagination in direction to the macrocosmos.
Later let’s return, a little faster, up to the point where we started and continue our trip in the opposite direction reducing distances of travel by factors of 10 into the
microcosmos.
Observe the constancy of the laws of the universe and think about how much the human race still needs to learn...
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BON VOYAGE!
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Distance to a bunch of leaves, in the garden
1001 meter
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Start our trip upwards .... We could see the foliage.
101 10 meters
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At this distance we can see the limits of the forest and the edifications
102100 meters
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We will pass from meters to kilometers..
Now it is possible to jump with a parachute ...
1031 km
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The city could be observed but we really can not see the houses
10410 km
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At this height, the state of Flórida - USA, can be seen..
105100 km
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Typical sight from a satellite
1061.000 km
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The north hemisphere of Earth, and part of South America
10710.000 km
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The Earth starts looking small...
108100.000 km
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The Earth and the Moon’s órbit in white....
1091 millón de km
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Part of the Earth’s Orbit in blue
1010 10 Millons de km
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1011100 millons de km
Órbits of: Venus and Earth...
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Órbits of: Mercury, Venus, Earth, Mars and Júpiter.
1012
1 billón de km
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At this height of our trip, we could observe the Solar System and the orbits of the planets
101310 billons de km
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1014
100 Billons de km
The Solar System starts looking small...
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The Sun now is a small star in the middle of thousands of stars...
10151 trillón de km
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At one light-year the little Sun star is very small
10161 light-year
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Here we will see nothing in the infinity....
101710 light-year
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“Nothing” Only stars and Nebulae...
1018100 light-years
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10191,000 light-years
At this distance we started travelling the Via-Láctea (Milky Way), our galaxy.
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We continued our travel inside the Via-Láctea.
102010,000 light-years
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We started reaching the periphery of the Via-Láctea
1021100,000 light-years
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At this tremendous distance we could see all the
Via-Láctea & other galáxies too...
10221 millión light-years
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From this distance, all the galaxies look small with inmense empty spaces in between.
The same laws are ruling in all bodies of the Universe.
We could continue traveling upwards with our imagination, but now we will return home quickly
1023 - 10 million light-years
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1022
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1021
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1020
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1019
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1018
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1017
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1016
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1015
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1014
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1013
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1012
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1011
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1010
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109
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108
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107
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106
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105
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104
Questions that come to our minds ...
Who are we? Where are we going? From where did we come from?
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103
Or... What do we represent in the Universe?
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102In this trip “upwards” we went to the power of 23 of 10
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101
Now we are going to dig inside of the matter in an inverse trip...
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We arrived at our starting point. We could reach it with our arms...
100
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Getting closer at 10 cm ...We can delineate the leaves.
10-110 Centímeters
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At this distance it is possible to observe the structure of the leaf.
10-21 Centímeter
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The cellular structures start showing...
10-31 Millímeter
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The cells can be defined.
You could see the union between them.
10-4100 microns
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Start our trip inside the cell...
10-510 microns
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The nucleus of the cell is visible.
10-61 micrón
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Again we changed the messuring unit to adapt to the minúscule size. You could see the chromosomes.
10-71.000
Angstroms
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In this micro universe the DNA chain is visible.
10-8100 Angstroms
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...the chromosómes blocks can be studied.
10-910 Angstroms
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It appears like clouds of electrons... These are carbon átoms that formed our world.
You could notice the resemblance of the microcosmos with the macrocosmos...
10-101 Angstrom
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In this miniature world we could observe the electrons orbiting the atoms.
10-1110 picómeters
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An inmense empty space between the nucleous and the electron orbits...
10-121 Picómeter
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At this incredible and minuscule size we could observe the nuceous of the atom.
10-13100 Fentómeters
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Now we could observe the nucleous of the carbon atom
10-1410 Fentómeters
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Here we are in the field of the scientific imagination, face to face with a proton.
10-151 Fentómeter
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Examine the ‘quark’ partícules
There is nowhere more to go...
At the limits of current scientific knowledge .
This is the limit of matter...
10-16100 Atómeters
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And now ...Are you the center of the universe?
Are you the special creature of the Creatión?
What is behind those limits? Are there any limits?
Note that going “downwards” we could only go to the power of minus 16ªof 10 and reached the (known?) limits of matter... But upwards we went to the power of 23ª of 10 and stopped... But really we could have continued our trip with out limits to our imagination!!!!
... then?
...who says that we are alone in the universe?
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Questions
How far is one light year?What is the maximum distance that we can imagine?What is the minimum size that we can imagine?
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Neutron spectrum in thermal & fast reactor
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Moderator
To reduce the neutron energy (E=1/2 m v2)Good moderator:
Low mass to reduce neutron velocity.Low neutron absorption property.
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Neutron Moderation & Nuclear Fission
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Coolant
To remove the heat and cool the reactor.Examples: – Water– Gas (i.e.; He)– Liquid Metals (i.e.; Na, Pb, Pb-Bi)
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Heavy Water & Light Water Reactors
1D22O vs 1H1
2O Reactors
1D22O / 1H1
2O = 1 / 6400D20 + Unat = possible (i.e. CANDU)H20 + Unat = impossibleH20 + Uenr = possible (i.e. PWR)
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Thermal vs Fast Reactors
Thermal reactors have moderator and consume U-235.Fast reactors do not have moderator and consume U-238.
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Research vs Power Reactors
We use radiations from research reactors and discard the heat.We use heat from the power reactors and discard the radiation.
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Questions
Can moderator and coolant be the same material ?What is the advantage of heavy water over light water?What kind of moderator is used in a fast reactor?
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Radioactivity
Radioactive decayHalf life (T1/2)N(t) = No exp (- lambda . t) lambda = 0.693/ T1/2
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Radioactivity Calculation
N=N0e-λt
Decay constant λ= 0.693/T1/2
T1/2: Half-life is the time during which the activity
falls by a factor of two.
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Questions
What percent of radioactive material is left after 5 half-life has passed ?How can one change the half-life of a radioactive material ? Through heating or submitting to high pressure?
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Nuclear fissionThe process of fission occurs through the interaction of particles called neutrons with the nucleus of the atoms of a nuclear fuel element such as uranium. As the result of this interaction, new radioactive elements called fission products, some neutrons, and a relatively large amount of heat are produced. These neutrons in turn are capable of causing further fissions and thus producing what is called chain reaction. The fission products are kept inside the fuel cladding in order to avoid contamination. The main concern of the reactor designers and operators in respect to safety is to guarantee that the cladding temperature will not go above its designed temperature and thus the integrity of the fuel cladding in maintained.
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Nuclear Fission
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Neutron Moderation & Nuclear Fission
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Decay Heat
The fission products that are radioactive materials as decay they produce heat.It is called “decay heat” or “residual heat”.
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Decay HeatTime after shutdown
Time Power
0 7%
1 hour 1%
1 day 0.4 %
1 weak < 0.2%
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QuestionsWhat is the difference between nuclear fission and nuclear fusion?
What is chain reaction in nuclear fission?
What is radioactive decay?
Are fission products radioactive materials?
How fission products produce heat?
Why this heat is important to the reactor safety?
How are we protected against fission products?
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Basic Reactor Physics
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Microscopic Cross Section – σ(barn = 10-24 cm²)
It is the measure of the probability of interaction between a neutron and a nucleus.
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Cross Sections Types
σ = f(Energy, Material)
σ = σa+ σs
σa = σf+ σc
σs = σse+ σsi
σr = resonance cross section
a= absorption, f= fission, c= capture, s= scattering,se= elastic scattering, si= inelastic scattering.
Cross Section Library: BNL-325
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Resonance Cross Section - σr
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Number Density – N(#/cm³)
N=ρAv/Mρ = gr/cm3 Av=0.602x1024 (Avogadro Number)M=gr/mole
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Macroscopic Cross Section – Σ(cm-1)
It is a measure of probability of interaction between one neutron and N nucleus.
Σ = N σ
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Spectrum.Neutron )( ,)(
)()(
section crossneutron Effective
==∫
∫ EdEE
dEEEψ
ψ
ψσσ
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Neutron Flux - Φ(n/cm2.sec)
Φ = Φ(r, t) The number of neutrons that passes an
area of 1 cm2 in one second.
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Questions
Is cross section the probability of interaction between neutrons and nucleus? What is barn?Resonance cross section is the type of absorption or scattering cross section? How many atoms are inside 1 cm3 of iron of density 7 gr/cm3 ?What is the difference between microscopic and macroscopic cross sections?
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ρ = 1 g/cm³, Av= 0.602 x 1024, σaH = 0.332 b, σaO = 0.178 mb, σsH= 38 b, σsO= 4.2 b
Solution:
N=ρAv/MNH2O = 1 x 0.602 x 1024 / (16 + 2x1) = 0.0334 x 1024
NH = 2 x NH2O = 0.0668 x 1024
NO = 1 x NH2O = 0.0334 x 1024 ΣaH20 = NH σaH + NO σaO. = (0.0668 x 1024 x 0.332 x 10-24) + (0.0334 x 1024 x 0.178 x 10-3 x 10-24) = 0.0222 + 0.0000059 = 0.022 1/cmΣsH20 = NH σsH + NO σsO = 2.682 1/cm
Σt = ΣaH20 + ΣsH2O = 2.704 1/cm
Calculation of the macroscopic cross section of water for thermal neutrons
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Diffusion Equation
Conservation of neutrons
Neutrons produced – neutrons absorbed – neutron leakage = variation of neutron density.
Equation of Diffusion of Neutrons
∇2Φ - Σa Φ + S = 1/v ∂n/∂t Leakage absorption Source variation
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Reaction Rate – R(Interaction/cm3sec)
R = Σ Φ
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Question
If every fission produces G joule of heat, how do you calculate the power (P) produced in a nuclear reactor ? Derive the formula: P=?
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Energy from fission
200 Mev / fission1 w = 6.24 e+12 Mev/sec1 w = 3.12 e+10 fission/sec
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Solution:
NU = 0.60 x19 x 0.602 x 1024 / (238x0.95 + 235x0.05) = 0.0288 x 1024.
Σf = NU σf = 0.0288 x 1024 x 582 x 10-24 = 16.76
V = 523599 cm³
Q = 3.04 x 10-11 x 16.76 x 107 x 523599 = 2.67 KW
Heat GenerationCalculate the heat generation in a 1 m diameter spherical homogeneous reactor made of 5% enriched uranium metal and water having fuel to moderator volume ratio of 60%. Assume uranium density of 19 g/cm3, σf = 582 b, heat generation of 3.04 x 10-11 Joule/Fission and average neutron flux of 107.
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Neutron flux distribution
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Neutron Multiplication Factor - K
Number of fissions in one generationK = Number of fissions in preceding generation
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Neutron multiplication factor
Ke = K-effectiveKinf= K-infinitiveρ = Reactivity = (Ke – 1)/ Ke
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Reactivity - ρ
ρ = (Ke - 1)/KeKe = 1 / (1 - ρ)Temperature Coefficient = dρ/dT
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Criticality of reactor
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Reactor Period - T(sec-1)
P(t) = P0 et/T
t=time
• T<0 Sub-critical reactor (power decreases).
• T>0 Super-critical reactor (power increases).
• T=infinite Critical Rector (power remains constant).
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Questions
What is the difference between Ke and reactivity? Why do we use both of them?A high excess reactivity causes high or low reactor period?Is a reactor with an excess reactivity of > 0.0065 (beta) controlable?What is the period of a nuclear bomb?
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reactor. infinite 1,issionNeutrons/F
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fpkLkk
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Spectrum.Neutron )( ,)(
)()(
section crossneutron Effective
==∫
∫ EdEE
dEEEψ
ψ
ψσσ
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buckling0
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Neutron Flux Distribution
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Section Cross Absorption cMacroscopilocityNeutron ve
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Neutron Flux Distribution in a Finite Cylindrical Reactor
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+
=
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==
=∂∂+
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Critical Cylindrical Reactor
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evkTPeak
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Maxwellian Neutron Spectrum
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Fuel Burnup
U-235 depletion due to fuel burnup (MWD/T).
Pu production as a function of burnup (U-238 + n Pu-239 ).
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SCALE Code
A computational reactor code that among other things calculates Ke, Kinf, and Φ.
We need to define as input the geometry and material composition in every region of the reactor. It is available from ORNL in U.S.A.
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Height Variation - CERMET FUEL
0.9
1.0
1.1
1.2
1.3
1.4
1.5
0 50 100 150 200 250 300
Height [cm]
Kef
f
2.0% Enrichment2.2% Enrichment5.0% Enrichment9.0% Enrichment19.0% Enrichment
Criticality of FBNR Reactor
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BurnupKe as a function of Burnup
0.7
0.8
0.9
1.0
1.1
1.2
0 10000 20000 30000 40000
Burnup [MWD/T]
Ke Enrichment 5.0%
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Fuel Burnup (MWD/T)
1 amu = 931 Mev (transformation E=mc²)1 gr U235 = 1 MWD (fission)
Burnup of PWR Fuel ~ 40.000 MWD/T-metal
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Plutonium Production
92U238 + n 94Pu239 + 2β
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Thorium Utilization
90Th232 + n 92U233 + 2β
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Minor Actinides in a PWR
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Zircaloy
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Thermal & Hydraulics
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Power Generation
(KJ/Kg)enthalpy exit coolant h(KJ/Kg)enthalpy inlet coolanth
(Kg/sec) rateflow mass m(MW) power thermalQ
where
)h(h mQ
exit
inlet
inletexit
==
==
−=
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s)-(Kg/mviscosity fluid μ1.75 of value determinedally experiment constant, empirical C150 of value determinedally experiment constant, empiricalC
where
ρgdZDε
(dL)ε)ρU(1CDε
μU(dL)ε)(1CdP
2
1
p3
22
2p
3
21
===
+−+−=
Pressure Loss in Bed
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Pressurized Water Reactors (PWR)
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Nuclear Fuel
U-235 is found in nature.
U-233 and Pu are produced artificially.
Uranium Mineral
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Uranium Mining
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A PWR Fuel Rod
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Structure of a PWR Fuel Assembly
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PWR Fuel Assembly
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PWR Fuel Storage Pool
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Questions: Consider Angra II
What is the composition of uranium sold in the market?What is the size of a PWR fuel pellet?What is the material composition of the fuel pellet? Why this composition was chosen?What is the size of fuel assembly?What is cladding?What is the importance of cladding?
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Fuel Enrichment by Centrifugal Method
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Neutron Moderation & Nuclear Fission
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Pressurized Water Reactor - PWR
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PWR Pressure Vessel
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Reactor Core in a Pressure Vessel
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Fuel Assembly distribution in the
Reactor Core
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Primary Circuit Pump
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Upper View of
the Reactor
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QuestionsWhat is the size and weight of a pressure vessel?What is the reactor core?How many types of enriched fuel is in the reactor? How much are the enrichments?Why the reactor has different enriched fuel? How many loops the reactor has?What is the size (flow rate) of each of the main reactor pump?
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Steam Generator
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Steam Generator
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Nuclear Power Plant under construction
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Containment under construction
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Containment
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Containment
(Spherical)
German
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Containment
(Cylindrical)
U.S.A
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QuestionsWhat is the size of the steam generator?How many steam generators the Angra II plant has?What is loss of coolant accident (LOCA) and what is its importance?What is the emergency core cooling system (ECCS) and how does it work?Compare spherical to cylindrical containment building and discuss the advantages and disadvantage of each.Discuss the necessity or not of cooling towers.Discuss the necessity or not of containment building.
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Nuclear Fuel Cycle
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Nuclear Fuel Cycle
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Nuclear Fuel Cycle
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QuestionsWhy there exists prohibitions on enrichment and reprocessing processes?What is the composition of uranium that goes to enrichment plant?What are the principles of gas diffusion and centrifugal processes for enrichment? What is vitrification and what is its purpose?Discuss two types of repositories proposed for long time deposition of long life radioactive materials. Do you find any problem with these proposals?
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Nuclear Reactor Safety
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Nuclear fissionThe process of fission occurs through the interaction of particles called neutrons with the nucleus of the atoms of a nuclear fuel element such as uranium. As the result of this interaction, new radioactive elements called fission products, some neutrons, and a relatively large amount of heat are produced. These neutrons in turn are capable of causing further fissions and thus producing what is called chain reaction. The fission products are kept inside the fuel cladding in order to avoid contamination. The main concern of the reactor designers and operators in respect to safety is to guarantee that the cladding temperature will not go above its designed temperature and thus the integrity of the fuel cladding in maintained.
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Inherent and Passive Safety
It is very desirable to develop concepts of inherently safe nuclear reactors whose safety features are easily demonstrable without depending on the interference of active safety devices which have some probability of failing, or on operator skills and good judgment, which could vary considerably.
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Sources of heat in a nuclear reactorThere are two sources of heat generation in a nuclear Reactor:
1. Heat produced by nuclear fission;2. Heat produced by decay of radioactive materials that
are produced by the fission of nuclear fuel.
The reactor safety requires that the fission process be under control and the cooling of residual heat due to the decay of fission products is achieved by natural convection
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Heat sources in a reactor accidentThere are only four significant sources of energy in a reactor accident: Nuclear power excursion, Thermal reactions (steam explosion), Chemical reactions (zirconium/water and core/concrete), and Radioactive decay heat. The first three can be limited or controlled by proper selection of materials - a form of inherent safety. The fourth energy source, decay heat, is a slow and inherently restricted form of energy release.
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Nuclear safety & decay heat
All current reactors need to include safety systems to remove decay or residual heat produced after the chain reaction in a reactor has ceased. It is this decay heat that threatens to produce the most serious of nuclear accidents namely the core melt. The inherently safe reactors are transparently incapable of producing a core melt. They are "forgiving" reactors, able to tolerate human and mechanical malfunctions without endangering public health. Also they are called "walk away" reactors as the key feature of these reactors is their reliance upon passive or non-mechanical, safety systems.
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Active and passive safety systems
Active systems depend on the well functioning of the physical components.Passive systems depend on the functioning of the law of nature.
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Inherent Safety
Inherent safety is obtained by the law of nature or what is called the law of physics.There is no active system involved.
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Passive cooling
Passive cooling is obtained by cooling through the phenomena of natural convection.
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New safety philosophy
The advent of innovative nuclear reactors is a shift in paradigms. It is based on a new safety philosophy. It will make the occurrence of accidents such as TMI and Chernobyl impossible.It challenges the scientists and technologists of the world to invent a new nuclear reactor where practically “total safety” is achieved. It promotes inherent safety philosophy meaning that the law of nature should govern the safety of the future reactors and not the manmade safety systems. For example, the safety of FBNR is obtained by utilizing the law of gravity that is inviolable. The cooling of residual heat produced by the radioactive fission products is done by natural heat convection.
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QuestionsWhat is the principle source of danger in a reactor and how it will comes about?How is the process of active safety in a reactor?How is the process of passive safety in a reactor?Give an example of inherent safety in an area different than nuclear reactor.What is passive cooling in a reactor and how is accomplished? When is needed?
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Global Warming
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Global Warming
Fossil fuels such as coal, oil, and gas pollute the atmosphere with CO, CO2, Sox, Nox, etc., providing acid rains and changing the global climate by increasing the greenhouse effect, while Nuclear energy does not produce these pollutants.
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1000 MWe Nuclear Reactor(per year)
• Uses 2.5 Million Tons Coal• Produces
– 5 000 000 tons CO2– 100 000 tons SO2– 75 000 tons NOx– 5 000 tons Cinzas
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Concentration of carbon dioxide.Variation in global temperature.
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If sea levels rise at the rates they are predicting, we may see hundreds of millions of refugees. Where will they go? Who will take them in? What does it mean about immigration regulations?
Some forecasts suggest that small island states will disappear entirely under the rising ocean.
This is the time to remind the international community that ethics and morality do play a very important role in any human activity. Especially when we have a situation affecting such a large number of poor and vulnerable populations.
UN panel on global warming made impressive observations
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Solution to Global Warming
• Energy Conservation Aspect • Energy Production Aspect
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Questions
Does conservation alone solves the problem of global warming? Why?Why global warming is considered also a moral problem?Explain some of the consequences of global warming.
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Energy Problem
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Source: International Energy Annual 2003
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Solution to the problem of energy
None of the energy resources alone is a panacea.
The solution to the ever increasing demand for energy to satisfy the needs of growing world population and improving its standard of living lies in the combined utilization of all forms of energy.
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Intensity of energy production
1 gr U-235 produce 1 MWD energy. 15 Ton fossil fuel produce 1 MWD energy. 2-3 Km2 solar collector produce 1 MWD energy.
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Equivalent energy
• 1 kg U = 100 tons coal • 1 Kg U-235 = 24 000 000 KWh
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1000 MWe Power Plant (per year)
• Requires 225 tons yellow cake, • 25 tons enriched uranium• Produce 23 m3 nuclear waste• 1 Kg high radioctivity waste
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Energy mix in Brazil
• 92% Hydroelectric • 3% Nuclear • 5% Others
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Electric Network
Brazil
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Evolution Of The Brazilian Energy Matrix Per Fuel (Mtep)
FUEL 2005 FUEL SHARE(%)
2030 FUEL SHARE(%)
Petroleum derivatives 85.3 39 161.2 29
Natural gas 19.7 9 88.9 16
Mineral coal and derivatives 13.1 6 38.9 7
Uranium oxide & derivatives 2.2 1 16.7 3
Hydropower and electricity 32.8 15 77.8 14
Vegetal coal and firewood 28.4 13 33.4 6
Sugar cane and derivatives 30.6 14 100.0 18
Other non-renewable primary sources
6.6 3 38.9 7
Total 218.7 100.0 555.8 100.0
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Electricity Capacity Expansion From Hydropower
2005(*) 2015(*) 2020 2025 2030
Installed capacity, GWe
68.6 99.0 116.1 137.4 156.3
Increase in the period,GWe
30.4 17.1 21.3 18.9
Annual average increase, MWe
3,050 3,400 4,300 3,800
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Electricity Capacity Expansion FromThermal Sources
2005(*) 2015(*) 2020 2025 2030 Increase2005-30
Installed capacity, MWe 16,900 24,300 26,800 30,300 39,800 22,900
Natural gas 8,700 13,000 14,000 15,500 21,00 12,300
Nuclear 2,000 3,300 4,300 5,300 7,300 5,300Coal 1,400 2,500 3,000 4,000 6,000 4,600
Other thermal sources 4,800 5,500 5,500 5,500 5,500 700
Increase in the period 7,400 2,500 3,500 9,500
Annual average increase,MWe
740 500 700 1,900 920
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Electricity Capacity Expansion From Alternative Sources
2005(*) 2015(*) 2020 2025 2030 Increase 2005-30
Installed capacity, MWe 1,415 5,533 8,783 13,983 20,883 19,468
PCH (small hydropower plants) 1,330 2,330 3,330 5,330 8,330 7,000
Wind plants 29 1,382 2,282 3,482 4,682 4,653
Biomass plants 56 1,821 2,971 4,521 6,571 6,515
Industrial residues plants 0 0 200 650 1,300 1,300
Increase in the period 4,118 3,250 5,200 6,900
Annual average increase, MWe 410 650 1,040 1,380 780
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Renewable Energies
Renewable energies such as solar and wind, though have their merits,
They are not able to deliver sufficient energy required by the developing and developed countries.
They are not constantly available. They also have adverse environmental effects.
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Electric Energy
About 30% of world’s primary energy consumption is electrical energy.About 15% is used in transport.About 55% is converted into steam, hot water and heat.
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Importance of Eletricity
XX century belonged to petroleum (fóssil fuel).XXI century belongs to eletrons (eletricity).
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Nuclear Energy
The solution to the problem of global warming lies both in the processes of energy conservation and energy production.
Nuclear energy produced safely will have an important role in solving the world energy problem without producing greenhouse gases.
The public objections to nuclear energy most often expressed are reactor safety, cost and nuclear waste disposal.
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Existing nuclear reactors
Presently, 438 nuclear power reactors are in operation
in 31 countries around the world, generating electricity
for nearly 1 billion people.
They account for approximately 17 percent of worldwide
electricity generation.
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QuestionsWhy the demand for energy is growing so fast?What is the solution to the energy problem?Why wind and solar energy are not total solution for the problem?What are the problems of present day nuclear energy?What is the importance of electricity in modern society? What countries are the bigest consumers of nuclear energy?
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Water Desalination
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Countries with water stress or scarcity by 2025
20% Moderate stress
40% High stress
0% No stress
80% Very high stress
10% Low stress
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The possibility of a dual purpose FBNR Plant to
produce electricity and desalinated water at the
same time.
Water Desalination
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Importance of Water
¾ of a body is water.97.0% of world water resource is salt water.2.6% is sweet water.Only 1.0% sweet water is available for consumption.Desalination Requires 2800 KWh/m3 of energy.
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Water Consumption
500-3000 m3/ton to produce grains.30 m3/Kg to product meet.1000-2500 m3/ton to produce synthetic materials.
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Dual purpose plant
The FBNR can operate within a cogeneration plant producing both electricity and desalinated water. A MultiEffect Distillation (MED) plant may be used for water desalination. An estimated 1000 m3/day of potable water could be produced at 1 MW(e) reduction of the electric power.
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Questions
Discuss the importance of water.How water desalination is done?Why a dual purpose plant for electricity and water production is more economic than a single purpose plant to produce water or electricity?
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New era of nuclear energy and
INPRO
International Project on Innovative Nuclear Reactors
and Fuel Cycles
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A new era of nuclear energy is emerging.
The International Atomic Energy Agency through its INPRO Project has committed itself to:
“Help to ensure that nuclear energy is available to contribute in fulfilling energy needs in the 21st century in a sustainable manner; and to bring together both technology holders and technology users to consider jointly the international and national actions required to achieve desired innovations in nuclear reactors and fuel cycles.”
New era of nuclear energy through INPRO
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0
5
10
15
20
25
30
Num
ber
of IN
PRO
mem
bers
2001 2002 2003 2004 2005 2006
27 Members Argentina, Armenia, Belarus, Brazil, Bulgaria, Canada, Chile, China, Czech Republic, France, Germany, India, Indonesia, Japan, Republic of Korea, Morocco, Pakistan, Russia, Slovakia, South Africa, Spain, Switzerland, The Netherlands, Turkey, Ukraine, USA and EC(+ announcements from Algeria, Kazakhstan and Belgium)
A s o f M a y 2 0 0 7
INPRO Members
Uruguay ?
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Structure of INPRO Methodology
Basic Principal
UserRequirement
Criterion(Indicator +Accept. Limit)
rules to
guide
RD&D
(14)
conditio
ns for
acce
ptance
of
User (
38)
enab
les ju
dgemen
t of
potentia
l of IN
S (94)
Fulfilment of hierarchy
Derivation of hierarchy
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Structure of INPRO Methodology
Infrastructure Economics
ProliferationResistance Safety
WasteManagement
Environment
Sustainability
Holistic approach to assess INS in seven areas to assure its stainability
Physical Protection
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TECDOC-1434 describes basis of the methodology
Manuals to describe how to make assessment. •Overview
•Economics•Safety (NPP)•Safety (FC facilities)•Environment•Waste Manag.•Prolif. Resistance•Physical Protection•Infrastructure
9 volumes
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Possible Modes of Participation in the INPRO
Direct monetary contributions (‘extra budgetary’).Providing Cost-Free-Experts;Performing agreed Innovative Nuclear System (INS) assessment studies;Participating in Collaborative Projects.
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Questions
Discuss how INPRO is capable of bringing about a new era of nuclear energy?What areas the INPRO evaluation of new innovative nuclear reactor cover? How can a country become a member of INPRO?
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Advantages of
small nuclear reactors
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Adequate for countries with small electric grids. Economy of power transmission to long distances.
Low capital investment.Good choice for countries with insufficient nuclear infrastructure and limited human resources.
They provide an attractive domain for fuel leasing and facilitate an option of factory fuelled reactors for those who prefer to be just the end users of nuclear power.
They provide means for learning knowledge and technology from a small prototype plant.
Some of the Important Advantages of the Small Nuclear Reactors
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Questions
What are the most important advantages of small reactors? Why nuclear industry does not construct small conventional nuclear reactors? Discuss the advantages and disadvantages of nuclear fuel leasing.Discuss the feasibility of establishing a World Nuclear Energy Company (WONEC).
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Description of the
innovative nuclear reactor
FBNR
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The Fixed Bed Nuclear Reactor (FBNR) is based on the
Pressurized Water Reactor (PWR) technology. PWR is a proven technology.
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Fuel OptionTRISO
A 15 mm diameter spherical fuel element made of compacted TRISO type coated particles in a graphite matrix cladded by silicon carbide.
MFE are coated particles and are similar to TRISO fuel with outer diameters about 2 mm. They consist of 1.5 - 1.64 mm diameter uranium dioxide spheres coated with 3 layers. The inner layer is of 0.09 mm thick porous pyrolytic carbide (PYC) with density of 1 g/cm3 called a buffer layer, providing space for gaseous fission products. The second layer is of 0.02 mm thick dense PYC (density of 1.8 g/cm3) and the outer layer is 0.07 - 0.1 mm thick corrosion resistant silicon carbide (SiC). Ceramic protection films, manufactured by chemical vapor deposition (CVD) method, create resistance of graphite components against water and steam at high temperatures (450°- 550° C at normal operating conditions and up to 1400° C at accidental conditions ). Small fuel elements are able to confine fission products indefinitely at a temperature less than 1400° C.
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TRISO Fuel Element
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TRISO Fuel Element
15mm diameter SiC cladded fuel element
TRISO type particles
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Fuel OptionCERMET
A 15 mm diameter spherical fuel element made of compacted UO2 coated particles in a zirconium matrix cladded by zircaloy.
The cermet fuel design is a fine dispersion of UO 2 or MOX micro-spheres that have uranium U-235 enrichment below 20%. The fuel micro-sphere diameter is 0.5 mm cladded by 0.025 mm thick Zr. The microspheres are embedded in Zr matrix with a porosity of 0.40. The fuel element is cladded with 0.30 mm thick Zr.
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CERMET Fuel Element(15 mm diameter)
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Zircaloy
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FBNR nuclear power plant with underground containment
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CERMET Fuel Element(15 mm diameter)
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QuestionsDiscuss the advantages and disadvantages of CERMET versus TRISO nuclear fuel.How inherent safety is accomplished in FBNR?How passive cooling is accomplished in FBNR?Discuss the advantages and disadvantages of underground containment.
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Characteristics of FBNR
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Diversity of applications
The FBNR is a landbased nuclear power plant for urban or remote localities The FBNR is designed to produce electricity alone or to operate as a cogeneration plant producing simultaneously:
electricity desalinated water steam for industrial purposes heat for district heating.
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FBNR is a small, simple in design, inherently safe and passively cooled nuclear reactor with reduced adverse environmental impact
The FBNR is shop fabricated, thus it guarantees the high quality fabrication and economic mass production process.
FBNR uses a proven technology namely that of the conventional pressurized water reactors (PWR).
FBNR is small in nature. The optimum size is about 40 MWe. The larger size can be achieved at the cost of a lower thermodynamic efficiency.
The obvious simplicity of the design and the lack of necessity for complicated control system, make the reactor highly economic. The steam generator is housed within the pressure vessel having an integrated primary circuit. Easy dismantling and transportability.The reactor can be operated with a reduced number of operators or even be remotely operated without any operator on site.
Some Characteristics of FBNR
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High conversion ratio
The moderator to fuel volume ratio of FBNR is about 0.7-0.8, compared to 1.8-2.0 for a conventional PWR. Thus, the neutron spectrum in the FBNR is harder resulting in a higher conversion ratio than the 0.55 for PWR that may be about 0.7-0.8. It may permit using MOX fuel, even in the beginning of the fuel cycle needing lower uranium enrichment, resulting in a Higher conversion ratio.
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Fuelling of FBNRThe FBNR has a very long lifetime according to the user’s need (more than 10 years) and will not be refueled on the site. Refueling is done in the factory. The fuel elements are confined in the fuel chamber. The FBNR modules are fabricated, fueled, and sealed in the factory under the supervision of the IAEA safeguard program. They are taken to the site and installed in the reactor and the spent fuel chamber will return to its final destination as sealed. The fuel chamber is stored in a passively cooled intermediate storage at the reactor site before going to the final disposal site or to the reprocessing plant or any other future destination.
Refuelling is done by the replacement of fuel chamber.
No unauthorized access to the fresh or spent fuel is possible because the fuel elements are either
In the core or,
In the fuel chamber under sealed condition
Therefore, no clandestine diversion of nuclear fuel material is possible.
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O FBNR allows utilization of variety of fuel cycles and can benefit from the concept of multilateral fuel cycle. The infrastructure needs for the plant using FBNR is a minimum. The important processes are performed in the regional centers serving many reactors.
Multilateral Fuel Cycle Centers
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New safety philosophyThe advent of innovative nuclear reactors is a shift in paradigms. It is based on a new safety philosophy. It will make the occurrence of accidents such as TMI and Chernobyl impossible.It challenges the scientists and technologists of the world to invent a new nuclear reactor where practically “total safety” is achieved. It promotes inherent safety philosophy meaning that the law of nature should govern the safety of the future reactors and not the manmade safety systems. For example, the safety of FBNR is obtained by utilizing the law of gravity that is inviolable. The cooling of residual heat produced by the radioactive fission products is done by natural heat convection.
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The spherical fuel elements are fixed in the suspended core by the flow of water coolant. Any malfunction in the reactor system will cut off the power to the coolant pump causing a stop in the flow. This results in making the fuel elements fall out of the reactor core by the force of gravity and become stored in the passively cooled fuel chamber under sub critical condition. Reactivity excursion accident cannot be provoked, because the reactor core is filled with fuel only when all operational conditions are met. A heat transfer analysis of the fuel elements has shown that, due to a high convective heat transfer coefficient and a large heat transfer surfacetovolume ratio, the maximum fuel temperature and power extracted from the reactor core is restricted by the mass flow of the coolant corresponding to a selected pumping power ratio, rather than by design limits of the materials.
FBNR Safety
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High level of safety
Strong reliance on Inherent safety (rely on the law of gravity)Passive cooling (rely on natural convection)Passive control system: The normal state of control system is “switch off”. The pump is “on” only when all operating conditions are simultaneously met.
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Resistance to any unforeseen accident scenarios
Any conceivable accident results in the cutting off the power to the pump,
That causes the fuel elements to fall out of the core by the force of gravity.
The normal state of control system is “switch off”. The pump is “on” only when all operating conditions are simultaneously met.
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Emergency Planning Zone (EPZ)
There is no core damage possibility, so there is no need for Emergency Planning Zone (EPZ).
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Underground containment and environment
The inherent safety and passive cooling characteristics of the reactor eliminate the need for containment. However, an underground containment is envisaged for the reactor to mitigate any imagined adverse event, but mainly to help with the visual effects by hiding the industrial equipments underground and presenting the nuclear plant as a beautiful garden compatible with the environment acceptable to the public.
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Utilization of spent fuel, nuclear waste and environment
The spent fuel from FBNR is in a form and size (15 mm dia. spheres) that can directly be used as a source of radiation for irradiation purposes in agriculture, industry, and medicine. Therefore, The spent fuel from FBNR may not be considered as waste as it can perform useful functions. Should reprocessing not be allowed, the spent fuel elements can easily be vitrified in the fuel chamber and the whole chamber be deposited directly in a waste repository. These factors result in reduced adverse environmental impact.
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Proliferation Resistance – Definition
Proliferation resistance is that characteristic of a nuclear system that impedes the diversion or undeclared production of nuclear material, or misuse of technology, by States in order to acquire nuclear weapons or other nuclear explosive devices.
Como II, IAEA STR-332, December 2002
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Proliferation Resistance – Definition
Intrinsic proliferation resistance features are those features that result from the technical design of nuclear energy systems, including those that facilitate the implementation of extrinsic measures.
Extrinsic proliferation resistance measures are those that result from States’ undertakings related to nuclear energy systems.
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Proliferation Resistance – Definition
Safeguards is an extrinsic measure comprising legal agreements between the party having authority over the nuclear energy system and a verification control authority (e.g. IAEA or a Regional Safeguards System)
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Proliferation Resistance Fundamentals
• Proliferation Resistance will be enhanced when taken into account as early as possible in the design and development of a nuclear energy system.
• Proliferation Resistance will be most effective when an optimal combination of intrinsic features and extrinsic measures, compatible with other design considerations, can be included in a nuclear energy system.
IAEA STR-332, December 2002
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INPRO Hierarchy of Demands on Innovative Nuclear Energy Systems (INS)
Basic Principle
User Requirement
Criterion
b
b
a
a
a = Derivation of hierarchyb = Fulfilment of demands on INS
= rule to guide RD&D
= conditions for acceptance by User
= enables judgement of potential of INS
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PR - Overall Structure
UR1.1 UR1.2 UR1.3
BP1
UR2.1 UR2.2
BP2
Poliferation Resistance
Criteria - Indicators, Evaluation Parameters
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Fool proof nuclear non-proliferation characteristic The non-proliferation characteristics of the FBNR is based on both the extrinsic concept of sealing and the intrinsic concept of isotope denaturing. Its small spherical fuel elements are confined in a fuel chamber that can be sealed by the authorities for inspection at any time. Only the fuel chamber is needed to be transported from the fuel factory to the site and back. There is no possibility of neutron irradiation to any external fertile material. Isotopic denaturing of the fuel cycle either in the U-233/Th or Pu-239/U cycle increases the proliferation resistance substantially. Both concepts of “sealing” and “isotope denaturing” contribute to the fool proof non-proliferation characteristics of FBNR.
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Definition of Terrorism
“An act or thread of violence against non-combatants with the objective of expecting revenge , intimation, or otherwise influencing an audience”
Jessica Stern
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Highly enriched uranium
• 1850 Tons in the world
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FBNR MEETS THE GOALSProviding sustainable energy generation that meets clean air objectives and promotes long-term availability of systems and effective fuel utilization for worldwide energy production,Minimize and manage their nuclear waste and notably reduce the long term stewardship burden in the future, thereby improving protection for the public health and the environment,Increase the assurance that it is a very unattractive and least desirable route for diversion or theft of weapons-usable materials, Excel in safety and reliability, Eliminate the need for offsite emergency response, Have a low level of financial risk comparable to other energy projects.
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Questions
Criticize the claimed features of the FBNR reactor from
all aspects.
Discover how a terrorist can affect the safety of the
reactor.
Discover how a bad intentioned country can misuse the
reactor for military purposes.
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Economic Considerations
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Low capital investment
The simplicity of design, Short construction period, and An option of incremental capacity increase
through modular approach, result in a Much smaller capital investment.
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Economy of Scale
Innovation creates a new paradigm.FBNR utilizes the "Economy of Numbers" instead of "Economy of Scale".
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Approximate Cost Estimate
Capital Investment = US$ 1000/KWe
Generation Cost 21 US$/MWh Capital Cost 16 US$/MWh Fuel Cost 3 US$/MWh Operational Cost 2 US$/MWh
A detailed cost study needs to be done.
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RAISING FUNDS
Leverage Factor
How a small investment by an investor/country can
raise a large capital for the project through a multi
national program.
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Financial Scheme
CountryCi
Private Investors
Industry
Research Centres
Government
CRP- IAEA Coordinated Research Project, the embryo of WONEC – World Nuclear Energy Company
EC
IAEA
If at least 3 European countries take part in the project, the European Community will contribute with 50% of the cost.
Some governments such as Italy contribute with 60% of the cost of energy projects that are considered to be “clean”.
Some governments give free money to help technology deveopment in their countries.
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Investment
$ 1.00
Government subsidy
$ 1.50 = $ 2.50
European Community’s “Matching Fund”
$ 2.50
+
+ $ 2.50 = $ 5.00
20 countries participate in the Projeto
$ 5.00X20 = $ 100.00
Leverage of Fundos for WONEC
Therefore, an investment of $ 1.00 raises $ 100.00 for the project.
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Universal Participation In the
FBNR Project
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The reactor that all can become stakeholders
The technology should be available to all the nations of the world under the supervision and control of the international authorities such as IAEA.
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Patent
There is no patent on FBNR.An example is IRIS that started by Politechnic of Milan. There is no patent for the idea, but Westinghouse has patents for technological aspects of its development.
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FBNR meets the requirements of the IAEA's INPRO
standards as a future reactor:
Safety
Economy
Non-proliferation
Nuclear waste
Environmental impact.
Infrastructure
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The benefits of the project for a country
Economic development
Energy without causing global warming.
High technology development.
Avoid brain drain
Influence of high technology on other Industries.
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Workshops
Training courses
Teaching at distance
Other methods
Transfer of the present knowledge on FBNR to a group of researchers can be done through
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“Help to ensure that nuclear energy is available to contribute in fulfilling energy needs in the 21st century in a sustainable manner; and to bring together both technology holders and technology users to consider jointly the international and national actions required to achieve desired innovations in nuclear reactors and fuel cycles.”
Exist the commitment of the International Atomic Energy Agency
To the World Community
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IAEA - International Atomic Energy Agency
www.iaea.org
INPRO - International Project on Innovative Nuclear Reactors and Fuel Cycles.
www.iaea.org/INPRO
SRWOSR - Small Reactors Without On-Site Refuelling
www.iaea.org/NuclearPower/SMR/CRP1
FBNR - Fixed Bed Nuclear Reactor
www.rcgg.ufrgs.br/fbnr.htm
CPP - Collaborative Project Proposal
www.iaea.org/INPRO
TC - Technical Cooperation
http://tc.iaea.org/tcweb/default.asp
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Form in the country a FBNR Group responsible for the research and development of the Fixed Bed Nuclear Reactor (FBNR).
The participating country will supply funds and scientific manpower (Researchers, Ph.D, and M.Sc. students).
These students may become involved in a “sandwich” type study, performing research on FBNR, but do their other academic activities according to the requirements of their university of origin.
The government provides research funds.
The participating country request the IAEA-INPRO to become a member of the Collaborative Project Proposal (CPP) on FBNR to get involved in the IAEA-INPRO activities including the evaluation of FBNR by INPRO Methodology.
The participating country will request the IAEA for financial assistance through the program of Technical Cooperation (TC).
Some preliminary actions
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FBNR is being developed under the auspices of the IAEAat the service of humanity
YOU ARE INVITED TO PARTICIPATE IN THE PROJECT
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