fusion technology r & d in japan - the fire placeitc-12/apfa'01 december 10-14, 2001 toki,...
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ITC-12/APFA'01December 10-14, 2001Toki, Gifu, Japan
Fusion Technology R & D in JapanFusion Technology R & D in Japan
Akira KohyamaAkira KohyamaInstitute of Advanced Energy,Institute of Advanced Energy,
Kyoto UniversityKyoto University
-- Goes into the 21st Century under the Unified Structure Goes into the 21st Century under the Unified Structure --
Fusion Program in JapanFusion Program in Japan
Japan intends to develop fusion as a viable energy option for the futureConstruction of experimental reactor has the highest priority Serious discussions have been and are being made to make a confident decision on ITER constructionIn parallel, Japan studies various concept improvements in plasma confinement, as well asmaterials development and reactor technology
by N. Inoue (Chair of Fusion Council, Japan)by N. Inoue (Chair of Fusion Council, Japan)Institute of Advanced Energy
, Kyoto University
Fusion Development Strategy in Japan
Second Phase Third Phase Basic Program Fourth Phase Program
JT-60Experimental
Reactor (ITER)
DEMO
Steady State
Improved Confinement
Advanced Divertor
Ignition Long-Burn (steady state)
Electricity Generation
Equivalent Q > 1~
Advanced Tokamak Study
Reactor Technologies
Core Program
Universities and National Lab. Helical System, RFP, Mirror, ICF, etc.
Power Plants
Safety Improvement
Demo Blanket
Reactor Relevant Technology R&D
SC, Heating,Tritium, Blanket Remote Maintenance, High Heat Flux etc.
Alternative and/or Innovative Concept Researches
High Field, High Temperature SC Coil
Low Activat ion Materials (Ferritic Steel etc.) Advanced Materials (SiC etc.)
Selection of Concept
By N. Inoue (FESAC at Snowmass, 1999)
IFMIF
Material/Blanket R & D StrategyMaterial/Blanket R & D StrategyInstitute of Advanced Energy
, Kyoto University
Fusion Technology R & D in JapanFusion Technology R & D in Japan-- Goes into the 21Goes into the 21stst Century, under the Unified Structure Century, under the Unified Structure --
From April, 1, 2001:From April, 1, 2001:
MOE (MOE (MonbushoMonbusho))
Universities/NIFSUniversities/NIFS
STASTA
JAERI/Nat. Labs.JAERI/Nat. Labs.
MEXTMEXT
Ministry of Education, Ministry of Education, Culture, Sports, Science Culture, Sports, Science
and Technologyand Technology
Institute of Advanced Energy,
Kyoto University
Fusion Technology R & D in JapanFusion Technology R & D in Japan-- In the past, under the dual structure In the past, under the dual structure --
MOE (MOE (MonbushoMonbusho))
Universities/NIFSUniversities/NIFS
STASTA
JAERI/Nat. Labs.JAERI/Nat. Labs.
NearNear--Term R & D IssuesTerm R & D IssuesEnergy Emphasized EffortsEnergy Emphasized Efforts
LongLong--Term R & D IssuesTerm R & D IssuesBasic/Fundamental ResearchBasic/Fundamental Research
There have beenThere have been ManyMany efforts forefforts forInteraction/CollaborationInteraction/Collaboration
Institute of Advanced Energy,
Kyoto University
Fusion Engineering NetworkMOE/US-DOE Collaboration
ITER-EDAJAERI/ORNL Collaboration
Fusion Engineering Network ActivityFusion Engineering Network ActivityInstitute of Advanced Energy
, Kyoto University
Fusion Engineering Network ActivityFusion Engineering Network ActivityInstitute of Advanced Energy
, Kyoto University
Materials/FuelMaterials/Fuel
MagnetoMagneto--electric/Magnetelectric/Magnet
System/SafetySystem/Safety
ICFICF
Structural MaterialsStructural Materials
InIn--reactor Componentreactor Component(PWI)(PWI)
Blanket TechnologyBlanket Technology
Tritium Science/EngineeringTritium Science/Engineering
Tritium BioTritium Bio--chemical effectschemical effects
ThermoThermo--mechanicsmechanics
Reactor DesignReactor Design
System/Safety DesignSystem/Safety Design
NeutronicsNeutronics
A Good Example can be seen in Materials R & D A Good Example can be seen in Materials R & D -- In the past, under the dual structure In the past, under the dual structure --
MOE (MOE (MonbushoMonbusho))
DOE/DOE/MonbushoMonbushoCollaborationCollaboration
STASTA
JAERI/ORNLJAERI/ORNLCollaborationCollaboration
RTNS-II (14MeV effect) Austenitic Stainless Steel (Fundamental)
FFTF/MOTA (High dpa effects) Austenitic S. S. (Weldment/Component)
JUPITER (Dynamic/Varying/ Reduced Activation Ferritic SteelsCumulative effects) ( Fundamental)
JUPITER-2 (Integration for Reduced Activation Ferritic SteelsAdvanced Blanket) (weldment/He effects,,)
Institute of Advanced Energy,
Kyoto University
AnotherAnother Good Example can be seen in ITER EDA Good Example can be seen in ITER EDA -- ITER/Japan Team with University participations ITER/Japan Team with University participations --Institute of Advanced Energy
, Kyoto University
There are many extinguished accomplishmentsThere are many extinguished accomplishmentsIn Fusion Engineering R & D In Fusion Engineering R & D ( well known 7 accomplishments)( well known 7 accomplishments)
Many supporting activities by Japanese UniversitiesMany supporting activities by Japanese UniversitiesShould be acknowledged. Should be acknowledged.
AnotherAnother Good Example can be seen in ITER EDA Good Example can be seen in ITER EDA -- ITER/Japan Team with University participations ITER/Japan Team with University participations --Institute of Advanced Energy
, Kyoto University
There are many extinguished accomplishmentsThere are many extinguished accomplishmentsIn Fusion Engineering R & D In Fusion Engineering R & D ( well known 7 accomplishments)( well known 7 accomplishments)
Many supporting activities in Japanese Universities Many supporting activities in Japanese Universities
Development of New Cooling Structure- Save space and cost -
The vertical target mock-up with annular flow has successfully withstood a heat load of 20 MW/m2, 10s for 1000 cycles.
CFC MonoblockL5 Divertor Project
Cassette body; US Vertical target; JA
Integration Tests of JA and US components were successfully completed.
Annular Flow
SS Sliding Support
Structure
~1 m
Development of ITER Divertor
AnotherAnother Good Example can be seen in ITER EDA Good Example can be seen in ITER EDA -- ITER/Japan Team with University participations ITER/Japan Team with University participations --Institute of Advanced Energy
, Kyoto University
There are many extinguished accomplishmentsThere are many extinguished accomplishmentsIn Fusion Engineering R & D In Fusion Engineering R & D ( well known 7 accomplishments)( well known 7 accomplishments)
Many supporting activities in Japanese Universities Many supporting activities in Japanese Universities
(1) Development of ITER Shielding Blanket
Beryllium-armored full-width First Wall panel (DSCu/SS) has successfully fabricated by HIP technique first time.
Blanket Technology
(2) Development of Breeding Blanket• Effects of thermal cycles on the
pebble bed structure has been investigated.
• World’s first mass production technology of Beryllium neutron multiplier pebbles has successfully been developed by the Rotating Electrode Method.
Be armour
He gas
Be rotatingelectrodeElectric arc
Be Pebbles
AnotherAnother Good Example can be seen in ITER EDA Good Example can be seen in ITER EDA -- ITER/Japan Team with University participations ITER/Japan Team with University participations --Institute of Advanced Energy
, Kyoto University
There are many extinguished accomplishmentsThere are many extinguished accomplishmentsIn Fusion Engineering R & D In Fusion Engineering R & D ( well known 7 accomplishments)( well known 7 accomplishments)
Many supporting activities in Japanese Universities Many supporting activities in Japanese Universities
Accum ulate the Behavior Data of Tritum in Large Space ・ Im prove the Behav ior Ana lysis Code Good tr it iium behavior simu lation could be ob tained by considering the ex perimental da ta , m ateria l p roperty data, optimum analysis mode l and eff ect o f trit ium absorp tion & desorption on the wall. It w as confirm ed that heavy wall con tam ination w as resu lted in case tha t t r it iu m v apo r (HTO) wa s released in the d ry atm osphere.
Trit ium Safe-Handling Technolo g y
0 6 0 1 20Time[sec]
Mon itor① Experim ent Analysis
Experim ent Analysis monitor②
Tri
tium
co
ncen
trat
ion
[ M
Bq
/m3
]
0
2 0
3 0
1 0
1 0sec 2 0 sec 30 sec 4 0 sec 50 sec 6 0sec
Diff usion behavio r o f the released tr it ium (a nalysis)
Leak Tig ht Chamber (Caisson)
2 .0 x2 .3 x2 .6 = 1 2 m3
Trit ium Re lea se
Vento lation
5 0m3 /hr
Mo n it o r
① ②
Trit ium Re lea se Po in t
1
1 0
1 00
1 00 0
0 1 5 0
Detrit iation st art
10 050T
riti
um c
onc
entr
atio
n [
M B
q/m
3]
Expe rim ent Analysis a t No con tamination
at Contam inatio n on t he w a ll Expe rim ent Analysis
Tim e[m in]
Accum ulate the Behavior Data of Tritum in Large Space ・ Im prove the Behav ior Ana lysis Code Good tr it iium behavior simu lation could be ob tained by considering the ex perimental da ta , m ateria l p roperty data, optimum analysis mode l and eff ect o f trit ium absorp tion & desorption on the wall. It w as confirm ed that heavy wall con tam ination w as resu lted in case tha t t r it iu m v apo r (HTO) wa s released in the d ry atm osphere.
Trit ium Safe-Handling Technolo g y
0 6 0 1 20Time[sec]
Mon itor① Experim ent Analysis
Experim ent Analysis monitor②
Tri
tium
co
ncen
trat
ion
[ M
Bq
/m3
]
0
2 0
3 0
1 0
1 0sec 2 0 sec 30 sec 4 0 sec 50 sec 6 0sec
Diff usion behavio r o f the released tr it ium (a nalysis)
Leak Tig ht Chamber (Caisson)
2 .0 x2 .3 x2 .6 = 1 2 m3
Trit ium Re lea se
Vento lation
5 0m3 /hr
Mo n it o r
① ②
Trit ium Re lea se Po in t
1
1 0
1 00
1 00 0
0 1 5 0
Detrit iation st art
10 050T
riti
um c
onc
entr
atio
n [
M B
q/m
3]
Expe rim ent Analysis a t No con tamination
at Contam inatio n on t he w a ll Expe rim ent Analysis
Tim e[m in]
AnotherAnother Good Example can be seen in ITER EDA Good Example can be seen in ITER EDA -- ITER/Japan Team with University participations ITER/Japan Team with University participations --Institute of Advanced Energy
, Kyoto University
There are many extinguished accomplishmentsThere are many extinguished accomplishmentsIn Fusion Engineering R & D In Fusion Engineering R & D ( well known 7 accomplishments)( well known 7 accomplishments)
Many supporting activities in Japanese Universities Many supporting activities in Japanese Universities
Development of Blanket Remote Handling Equipment with High Positioning Accuracy
Installation C ondition for B lanket M odule H a ndling
Installation of 4-ton M odule under C learance of ±0.25 m m betw een K ey and G roove
T est R esult for B lanket Installation
B lanket m odule has been successfully installed under the required ITE R condition by the passive com pliance due to the flaxibility of the m anipulator and the assistance of the cham fer configuration of the key.
K ey
G roove
C ham fer(10m m )
M oduleE nd-EffectorM anipulator
E nd-E ffector Blanket M odle
R ail K ey
G rooveModule Weight :4ton Key/Groove Clearance : ±0.18 mm (measured) Positioning Accuracy :±2 mm Max.Allowable Misalignment :±10 mm (axis) ± 0.5 degree (angle)
Performances of Manipulator
Development of Blanket Remote Handling Equipment with High Positioning Accuracy
Installation C ondition for B lanket M odule H a ndling
Installation of 4-ton M odule under C learance of ±0.25 m m betw een K ey and G roove
T est R esult for B lanket Installation
B lanket m odule has been successfully installed under the required ITE R condition by the passive com pliance due to the flaxibility of the m anipulator and the assistance of the cham fer configuration of the key.
K ey
G roove
C ham fer(10m m )
M oduleE nd-EffectorM anipulator
E nd-E ffector Blanket M odle
R ail K ey
G rooveModule Weight :4ton Key/Groove Clearance : ±0.18 mm (measured) Positioning Accuracy :±2 mm Max.Allowable Misalignment :±10 mm (axis) ± 0.5 degree (angle)
Performances of Manipulator
AnotherAnother Good Example can be seen in ITER EDA Good Example can be seen in ITER EDA -- ITER/Japan Team with University participations ITER/Japan Team with University participations --Institute of Advanced Energy
, Kyoto University
There are many extinguished accomplishmentsThere are many extinguished accomplishmentsIn Fusion Engineering R & D In Fusion Engineering R & D ( well known 7 accomplishments)( well known 7 accomplishments)
Many supporting activities in Japanese Universities Many supporting activities in Japanese Universities ITER
requirement
May, 2000
SMES
Mag.Lev.
60
40
20
0
Coi
l Cur
rent
(kA
)
6 8 10 12 13 14
Success in 1)10,000 cyclic operation 2)charge up to 13T with 1.2T/S
46kA
Typical current pattern
60s
Latest technology before this project
US
France
Results : 1) ITER coil design was validated. 2) Coil fabrication under the international task shearing was successfully demonstrated.
Magnetic Field ( T)
EUSwissJapan
USA
GermanyGermanyJapanJapan
Japan
Japan
Japan
Japan
Experiment was performed from March to the end of August, 2000.
Success of the ITER CS Model Coil Experiment
New Project JUPITER-II (2001 - 2006)
Materials integration utilizing reactor irradiation and related basic research for advanced blankets
Co
ola
nt
Tem
per
atu
re (
C)
Energy Conversion Efficiency to Electricity (%)
RAFs (JLF-1, F82H) /H2O
20 30 40 50
300
500
700
900
1100
316 SS /H2O
Targets of Fusion Power ReactorsTargets of Fusion Power Reactors-- Attractive Options Attractive Options --
SiC/SiC/He
RAF-ODS(JLF-OD, F82H-OD) /H2O
V-4Cr-4Ti(Si,Al,Y) /Li
Institute of Advanced Energy,
Kyoto University
JUPITER-II Tasks
Subtask 1: System Design and modeling
Subtask 2: Multi-scale modeling
Task 3: Modeling for System Integration
Task 1: Self-cooling Liquid Blanket
Task 2: High TemperatureGas-cooling Blanket
Subtask 1:Key Tech. R&D
Subtask 2: System Performance.*.
Subtask 1: Key Tech. R&D
Subtask 2: System Performance.*.
*:System Performance evaluation under neutron irradiation.
Blanket R&D in JapanBlanket R&D in Japan
“Medium-term research plan for power generating breeding blanket”August 2000, by Fusion Council
- R&D for DEMO blanket. Blanket module test in ITER: important milestone.- Three C&Rs and selections scheduled
- JAERI: core institute for solid blanket developmentUniversities (NIFS): fundamental studies to obtain perspective on liquid blanket,
material development, various fundamental studies on solid and liquid blankets
Reference blanket JAERI: lithium ceramics cooled by supercritical waterNIFS: FFHR, flibe as breeder and coolant
Advanced blanket concepts with high coolant temperature, advanced safety,high resistance for large neutron flounceFlibe Blanket, Liquid Lithium with Vanadium Alloy, Solid Breeder and SiC/SiC
JUPITER-II: Japan-MEXT US-DOE collaborative project on advanced blankets2001-2006, mainly using facilities at INEEL, UCLA, ORNL, ANL
Institute of Advanced Energy,
Kyoto University
Since ’92 for a decade, Under the Japanese initiative, RAF database has been constructed ( IEA RAF WG)
Display Modes (Example)Display Modes (Example) Data Plot (Example)Data Plot (Example)
Creep Property(F82H)
RAF Database (F82H/JLF-1)
Institute of Advanced Energy,
Kyoto University
Reduced Activation Ferritic Steel R&D in JapanReduced Activation Ferritic Steel R&D in Japan
Improvement in DBTT
Institute of Advanced Energy,
Kyoto University
Reduced Activation Ferritic Steel R&D in JapanReduced Activation Ferritic Steel R&D in Japan
DBTT trend band for JLF-1
100
150
200
250
300
0 20 40 60 80 100
Displacement Damage (dpa)
DB
TT
(K)
Unirradiated0.01dpa 570K JMTR13.1dpa 646K22.9dpa 681K34.5dpa 680K43.8dpa 700K59.3dpa 680K
Unirradiated17.7dpa 663K44.0dpa 700K
F82H
Unirradiated17.7dpa 663K44.0dpa 700K
F82H
JLF-1
F82H
JLF-1 680K
W3 660K 22.9dpaW4 660K 22.9dpa
W1 660K 22.9dpaW2 660K 22.9dpa
W steels
W3 660K 22.9dpaW3 660K 22.9dpaW4 660K 22.9dpaW4 660K 22.9dpa
W1 660K 22.9dpaW1 660K 22.9dpaW2 660K 22.9dpaW2 660K 22.9dpa
W steels
W steels
Radiation Effect on Stress AmplitudeRadiation Effect on Stress Amplitude
JMTR ~0.005dpa (3.1x1019cm-2 / Irr. Temp. ~90C)
• The increase of initial stress amplitude was 292MPa at ∆εa= 2%, and 116MPa at ∆εa= 1%.
• Number of cycles to failure of ∆εa= 2% case was reduced to 13% of unirradiated case.
1 10
400-400
500600
700
800
-500
-600
-700
-800102 103 104
Number of cycles
Pea
k st
ress
(M
Pa)
Unirradiated□ ∆εa=2%, Nf:9.8x102
◆ ∆εa=1%, Nf:4.6x103
Post irradiation□ ∆εa=2%, Nf:1.3x102
◆ ∆εa=1%, Nf:2.3x103
Unirradiated□ ∆εa=2%, Nf:9.8x102
◆ ∆εa=1%, Nf:4.6x103
Post irradiation□ ∆εa=2%, Nf:1.3x102
◆ ∆εa=1%, Nf:2.3x103
1 10
400-400
500600
700
800
-500
-600
-700
-800102 103 104
Number of cycles
Pea
k st
ress
(M
Pa)
Unirradiated□ ∆εa=2%, Nf:9.8x102
◆ ∆εa=1%, Nf:4.6x103
Post irradiation□ ∆εa=2%, Nf:1.3x102
◆ ∆εa=1%, Nf:2.3x103
Unirradiated□ ∆εa=2%, Nf:9.8x102
◆ ∆εa=1%, Nf:4.6x103
Post irradiation□ ∆εa=2%, Nf:1.3x102
◆ ∆εa=1%, Nf:2.3x103
F82H IEA HeatF82H IEA Heat
Institute of Advanced Energy,
Kyoto University
Data base development toward DEMO.
Ferromagnetic effects.
Development of high heat-resistant super steels and ODS steels.
Development of welding/joining technology and ODS-clad processing.
Compatibility with pressurized water and super critical water.
Technology/Engineering Integration for
Blanket/Reactor Components Fabrication
Performance Evaluationand Improvement under
Neutron EnvironmentBlanket Environment
SSTR or ASSTR
R & D of Ferritic Steels for FusionR & D of Ferritic Steels for Fusion-- fromfrom Fundamental Materials R & D tFundamental Materials R & D to Technology/Engineering Integration o Technology/Engineering Integration --
Institute of Advanced Energy,
Kyoto University
Impurity level of NIFS- and US- HEATs
Fabrication of High Purity Large Products of VFabrication of High Purity Large Products of V--4Cr4Cr--4Ti4Ti(NIFS(NIFS--HEATsHEATs) )
Large V-4Cr-4Ti ingots with reduced impurity levels were produced in NIFS
Feasibility of recycling by quasi-remote (simply shielded) processing was verified
The resulting products were used for Round-robin test by international collaboration
100
200
300
400
100 200 300 400
Oxy
gen,
CO
/ m
ass
ppm
Nitrogen, CN / mass ppm
V metal
IngotPlate
V metal
PlateIngot
US-DOE-HEAT
NIFS-HEAT-1
0
NIFS-HEAT-2
Ingot
Improved
(Muroga, Nagasaka, Heo, NIFS)
US832665US832864NIFS-HEAT-1NIFS-HEAT-2
0
200
400
600
800
1000
1200
Al Nb Ag Mo(x10) (x100)
Impu
rity
Leve
l (w
ppm
)
Recycling Limit Single remote recycling Single quasi-remote recycling Single hands-on recycling Multiple remote recycling
less than*# not available
***#
Impurity level and recycling criteria
Improvement of Welding PropertyImprovement of Welding Property
Reduction of oxygen level in NIFS-HEAT resulted in significant enhancement of the mechanical property of the weld joint
Impact property of the TIG weld joint
Weld joint
0
2
4
6
8
10
12
14
-200 -150 -100 -50 0 50 100 150A
bsor
bed
ener
gy /
JTest temperature / C
NIFS-HEAT-1
USDOE-HEAT
(Muroga, Nagasaka, Heo, NIFS)
TIG weld joint of NIFS-HEAT-1
Improvement of Resistance to Radiation and Improvement of Resistance to Radiation and Oxidation by Addition of Si, Al and YOxidation by Addition of Si, Al and Y
Ductility after irradiation at 300~400C was significantly enhanced
Oxidation during exposure to air was strongly suppressed to 973K
Weight gain by exposure to airUniform elongation of irradiated alloys
0
0.02
0.04
0.06
0.08
0.1
773 873 973 1023
V-4Cr-4TiV-4Cr-4Ti-0.5SiV-4Cr-4Ti-0.5AlV-4Cr-4Ti-0.5Y
Oxidation temperature (K)
Wei
ght g
ain
(mg/
mm
2 )
Oxidation in air for 1 hr
(Abe, Satou, Fujiwara, Chuto, Tohoku University)
Melted
Institute of Advanced Energy,
Kyoto University
Irradiation Effects Irradiation Effects on Mechanical Properties of SiC/SiC on Mechanical Properties of SiC/SiC
1: 500C, HFIR2: 400C, HFIR 3: 200-500C, HFIR4: 300-500C, JMTR5: 430-500C, EBR-II
◆ Hi-Nicalon Type-S/PyC/FCVI-SiC■ Hi-Nicalon/PyC/FCVI-SiC▲ Nicalon/PyC/FCVI-SiC◇ Tyranno-SA/PyC/FCVI-SiC○ Monolithic CVD-SiC
6: 300C, HFIR7: 800C, HFIR8: 800C, JMTR9: 740C, HFIR10: 630, 1020C, ETR
0
1
0.1 1 10 100Neutron Dose [dpa-SiC]
S uIr
rad./S
uUni
rrad
.
3
2
2
7
6
7
7
4
5
5
5
5
2
2
3
1
1
1
888
82
2
6 7
710 9
7
7
6
Improvements inImprovements inFiber and processingFiber and processing
Improvement in Thermal Stress Figure of MeritImprovement in Thermal Stress Figure of Merit-- by LPSby LPS--SiC/SiC SiC/SiC --
0
5
10
15
20
25
30
35
40
45
50
200 700 1200 1700
Temperature [K]
M [k
W/m
]Steel (Fe-8Cr-2W)V-alloy (V-4Cr-4Ti)SiC/SiC (SNECMA Cerasep N3-1)SiC/SiC (MER CVR)SiC/SiC (CREST-ACE LPS Lab-grade)
LPS-SiC/SiCMass-production grade
( )E
KM
th
thUTS
ανσ −
=1
Institute of Advanced Energy,
Kyoto University
Institute of Advanced Energy,
Kyoto University
SiC/SiC R & D Goals and StatusSiC/SiC R & D Goals and Status-- 2000 2000 --
TAURO
ARIES-AT
D-SSTR
CERASEP
CREST-CVI
?
?
UnirradiatedTensile Strength
(500MPa/FS)
Young’smodulus
(300GPa/FS)
Mass Density(3.0Mg/m3/FS)
UnirradiatedThermal
Conductivity(20W/m-K/FS)
UnirradiatedUpper
Temp. Limit(1500℃/FS)
Additional IssuesFatigue lifetimeCreep strength
JoiningHermetic sealing
Chemical compatibilityTritium retentionFabrication costImpurity control
IrradiatedTensile
Strength (500MPa/FS)
IrradiatedUpper
Temp. Limit (1500℃/FS)
IrradiatedThermal
Conductivity (20W/m-K/FS)
?
TAURO
ARIES-AT
D-SSTR
CERASEP
CREST-CVI
?
?
UnirradiatedTensile Strength
(500MPa/FS)
Young’smodulus
(300GPa/FS)
Mass Density(3.0Mg/m3/FS)
UnirradiatedThermal
Conductivity(20W/m-K/FS)
UnirradiatedUpper
Temp. Limit(1500℃/FS)
Additional IssuesFatigue lifetimeCreep strength
JoiningHermetic sealing
Chemical compatibilityTritium retentionFabrication costImpurity control
IrradiatedTensile
Strength (500MPa/FS)
IrradiatedUpper
Temp. Limit (1500℃/FS)
IrradiatedThermal
Conductivity (20W/m-K/FS)
?
Major Subjects
(1)(1) High Z plasma facing materialsHigh Z plasma facing materials and interaction with plasmaNagoa Univ., Doshisha Univ., Fukuoka Univ. of Education, Kyoto Univ., NIFS, etc. (IEA-TEXTOR Collaboration)
(2) Measurement of tritium in the plasma facing materials of fusion experimental devices
Toyama Univ., Nagoya Univ., NIFS (IEA-TEXTOR Collaboration)
(3) Developments and evaluation of high-Z plasma facing materialsTohoku Univ., Kyushu Univ., NIFS, Kagoshima Univ., etc.(LHD Joint Projects)
(4) H and He irradiation experiments of W-coated materials with plasma simulators
Kyushu Uinv., NIFS (J-US Collaboration)
(5) Analysis of the first wall of TRIAM-1M and LHD Hokkaido Univ., NIFS (LHD Joint Projects, NIFS Joint Projects)
PWI and Plasma Facing Materials PWI and Plasma Facing Materials Institute of Advanced Energy
, Kyoto University
Deposit of TRIAMDeposit of TRIAM--1M 1M TokamakTokamakFusion Group RIAM Kyushu University
TRIAM-1M deposit
Due to the co-deposition of Mo with residual Oxygen, structure and properties of the wall surface chanagecompletely. High D retention change hydrogen recycling.
Critical issue for the control of steady state plasma
Fine fcc crystals, 1nm0
5 1017
1 1018
1.5 1018
2 1018 Mo+O2
on SUS
Mo BulkSUS
D2
des
orp
tio
n[D
2/m2 s
]
D injection:RT, 3x1021 D/m2
300 400 500 600 700 800 900 1000 1100Temperature[K]
TDS of D2
0
5 1017
1 1018
1.5 1018
2 1018 Mo+O2
on SUS
Mo BulkSUS
D2
des
orp
tio
n[D
2/m2 s
]
D injection:RT, 3x1021 D/m2
300 400 500 600 700 800 900 1000 1100Temperature[K]
300 400 500 600 700 800 900 1000 1100Temperature[K]
TDS of D2
Loss
Fusion PlasmaTest Blanket
Main Fuel CycleDeuterium
【Tritium Flow in Fusion Reactor】
Ash
EmergencyRecovery
(Heat, Tritium)
Loss
Loss
Loss
FUEL CYCLE!, SAFETY!
Tritium
ITER
( I ) ( II ) ( III )Preparatory Plasma D-T Burning Plasma Controlled Plasma Experiment Experiment Operation
preparatorytritiumstudy
safetyconfinement
biologicalassessment
safety confinement (remote control)
environmentalassessment
fueling systemeach
unit operation
fueling systemwith
one throughmode
fueling systemremote controland continuous
operation
self-sustainedfuel cycle
improved fueling system
(preparation, settlement, measurement, control, regulation, waste treatment)
Where are we struggling ?Where are we struggling ?--Radiation EffectsRadiation Effects--
5 nm
Peak damage state iniron cascades at 100K
50 keVPKA(ave.
fusion)
10 keV PKA(ave. fission)
0.04 psec 0.1 psec
0.2 psec 0.26 psec
Institute of Advanced Energy,
Kyoto University
ConclusionConclusion
Fusion Engineering Activities in Japan are quite active Fusion Engineering Activities in Japan are quite active and efficient under the newly unified structure, MEXT.and efficient under the newly unified structure, MEXT.
Near term issues, for ITER, and long term issues, for Near term issues, for ITER, and long term issues, for DEMO and Power reactor are simultaneously carried DEMO and Power reactor are simultaneously carried out, well balanced and well managed condition.out, well balanced and well managed condition.
Fusion Engineering Activities in Japan will be Fusion Engineering Activities in Japan will be strengthened and accelerated with the decision of the strengthened and accelerated with the decision of the ITER invitation to Japan, in the near future. ITER invitation to Japan, in the near future.