[email protected] nuclear facilities decommissioning & design an introduction to senac activities...
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Nuclear Facilities Decommissioning & Design
An introduction to SENAC activities
JM. Dumas
CEA Saclay, DSM/DAPNIA/SENAC, F-91191 Gif-sur-Yvette, France
Bucharest May 2006 [email protected]
[email protected] 07-11 Nov 2005 [email protected]
Main objectives
to contribute to the design of nuclear facilities
(accelerators, reactors, laboratories,…)
to develop methodologies in radioactive waste management
and in radiological impact evaluations
to maintain a high level of expertise in decommissioning
(experience feedback in dismantling of accelator facilities)
to take part in educational programs
(decommissioning & radioactive waste management)
Bucharest May 2006 [email protected]
The SENAC activities
[email protected] 07-11 Nov 2005 [email protected]
Main applications
design studies for small facilities (ARRONAX cyclotron,…)
to large nuclear facilities (ITER, SPIRAL2,...)
biological shielding (adaptation to dose rate limits, application of
ALARA method to operate,…),
choice of materials (limitation of radioactive waste produced
by activation of components,…)
limitation of release of radioactive gases or particles to
environment
nuclear safety & security report to authorities
Bucharest May 2006 [email protected]
The SENAC activities
[email protected] 07-11 Nov 2005 [email protected]
Main applications
global strategy and studies of decommissioning based on
radioactive waste management and radioprotection
application of nuclear safety authority requirements,
radioactive waste zoning (nuclear / non nuclear waste),
radioactive waste characterization and classification
radioactive waste processing (treatment, conditioning,transport to storage)
safety of the final state to terminate the nuclear Licensing process
(evaluation of the radiological & residual impact)
Bucharest May 2006 [email protected]
The SENAC activities
[email protected] May 2005 [email protected]
From decommissioning to design at DAPNIA/SENAC
Target station design at ARRONAX cyclotron facilityBeam line dismantling at SATURNE accelerator
SATURNE proton accelerator Emax~3 GeV (Saclay) *
ALS electron accelerator Emax~700 MeV (Saclay) *
RUS research reactor P=100 KW (Strasbourg)
ULYSSE research reactor P=100 KW (Saclay)
RAPSODIE research reactor P=40 MW (Cadarache)
→ SILOE research reactor P=35 MW (Grenoble)
→ PHENIX power reactor P=250 MW (Marcoule)
ARRONAX cyclotron facility (Nantes) *
→ SOPHI positron source (Saclay)
→ SPIRAL-2, EURISOL RIB production facilities
→ CPO proton therapy facility (Orsay)
→ LHC & SPS accelerators (CERN)
[email protected] May 2005 [email protected]
Decommissioning of RUS research reactor
Conventional39%
LA waste20%
VLA waste41%
[email protected] May 2005 [email protected]
Decommissioning of ULYSSE research reactor
Conventionalzone 78,4%
Nuclear zoneFA
6,6% Nuclear zoneTFA15%
[email protected] May 2005 [email protected]
Decommissioning of RAPSODIE research reactor
LA waste
VLA waste
Conventional waste
36%
16%
47%
LA waste
VLA waste
Conventional
[email protected] May 2005 [email protected]
Residual activity in beam line components at CPO
Chambred'ionisation
monitrice
Diffuseur pyramidalPlexi/Plomb
Prédiffuseur 0.5 mm Plomb
Collimateurpersonnalisé
Bolus plexi
0 cm250
C0F 3 C2F 5 C3 F 7 C4F 8 cm200 150 100 50
Collimateur
200MeV
Modulateur d'énergieAluminium
Filtre binairePlomb / Lexan
Proton therapy beam line at CPO
→ Beam collimators Cu 58.7%, Zn 39.2%, Pb 2.1%
→ Irradiation time 6 minutes with 200 MeV protons
→ Average mass 7 Kg
→ Present stock 4.5 tons of irradiated material
Residual activity of a collimator
Cooling time (days)
Act
ivity
(B
q/g)
[email protected] May 2005 [email protected]
High intensity positron source SOPHI
• Shielding calculations for neutrons and photons
• Electron beam dump design for low neutron production
Neutron transport in biological shielding
Design of ARRONAX nuclear facility
TR1
TR2
TR3
TR5
TR4
EX1CYCLOTRON
70 MeV protons sur la cible
Bucharest May 2005 [email protected]
Beam-target configuration / radioisotope yield
Application to waste zoning of SATURNE accelerator facility
Conventional waste zone
Nuclearwaste zone
Waste zoning of nuclear facilities
Bucharest May 2005 [email protected]
Saturne facility
Application to waste zoning of ALS linear accelerator facility
Conventional waste zone
Nuclearwaste zone
Waste zoning of nuclear facilities
Bucharest May 2005 [email protected]
ALS facility