vtt technical research centre of finland …...fir1 research reactor (triga mark ii, 250 kw)...
TRANSCRIPT
VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTD
FiR 1 TRIGA research reactordecommissioning project
Current and Emerging Methods for OptimisingSafety and Efficiency in Nuclear Decommissioning,Sarpborg, Norway. 7.2.2017Antti Räty ([email protected])
227/01/2017 2
Contents
FiR1 TRIGA reactorProject road map and recent progressWaste characterisationPlanned dismantling techniquesLicence applicationChallenges and lessons learned
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
327/01/2017 3
FiR1 research reactor (TRIGA Mark II, 250 kW)
Operation for years 1962-2015. Around 11500 MWh.Early operation: intensive neutron beam research,activation analysisIn-core irradiations for isotope production (82Br, 24Na,140La etc.), activation analysis and irradiation testingFacility for Neutron Capture Therapy constructed
BNCT treatments (> 200 patients) in 1997–2012Special materials to be managed indecommissioning
Operating license valid until 2023Final shutdown 30.6.2015
License to be amended for decommissioningInventory estimates (excluding fuel):
Mass 75 tons (mainly concrete)Volume 40 m3
Activity ~5 TBq (BNCT moderator and steel > 1 TBq)
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
427/01/2017 4
Decommissioning project road map
Amendment tooperatinglicense
SNF removal &transport Dismantling
LILW storageDecontamination
Etc.
2017 2018 2019 2020 2021 2022Indicative time scale
Applicationto State Council
Safety caseCompletion of
inventory estimatesDismantling andpackaging plan
AgreementsSNF (US)
LILW interim storage (domestic)Various services
Procurements
etc.
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
527/01/2017 5
Recent progress and on-going work
Fuel inspection by Idaho National Laboratories in 4/2016Technical dismantling plan and work instruction finalised in1/2017Decommissioning licence application to be send in spring2017On-going negotiations on options for SNF and dismantlingwaste intermediate and final disposal.Material characterisation by measurements to validatecomputational estimates.
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
627/01/2017 6
Radionuclide inventory calculation at VTT
Component-wise calculations. Altogether around 200 cases.
REACTOROPERATIONALHISTORY
REACTORGEOMETRICSAND MATERIALDISTRIBUTION
MATERIALCOMPOSITION
INPUT FORNEUTRON FLUXCALCULATIONS
CALCULATIONOF NEUTRONFLUXES ANDSPECTRA
INPUT NEUTRONACTIVATIONCALCULATIONS
POINT-DEPLETIONCALCULATIONOF NEUTRONACTIVATION
INVENTORY OFACTIVATEDCOMPONENT
MCNP ORIGEN-S
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
727/01/2017 7
Measurement scheme
Samples
-spectrometry Chemical sepation forhard-to-measure nuclides
ICP-MS LSC Other specialmethods
Material-wise nuclide vectors
Packeddismantlingwaste
-spectrometry Activity in awaste package
Data on hard-to-measure nuclides
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
827/01/2017 8
Dismantling planning by BNG
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
Phase Work Duration(weeks)
1 Preparatory measures 42 Dismantling of reactor than internals (high activity) 83 Dismantling of cooling circuits and heat exchangers 44 Dismantling of beam tubes and active concrete 135 Dismantling of rest of the systems (low activity) 66 Concluding measures 47 Clearance measurements 13SUM 52
• Remove active parts and continue with normal industrialdismantling
927/01/2017 9
Decommissioning licence applications
First nuclear facility to be decommissioned in FinlandEnvironmental Impact Assessment was carried out in2014-15Decommissioning licence application to state council inspring 2017. Evaluation takes about a year.Application requires reports e.g. on dismantling plan, riskanalysis, safety & security, decommissioning organisation etc.
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
1027/01/2017 10
Challenges and lessons learned
Project requires several agreements on SNF anddecommissioning waste. Keep all the options open.SNF nuclear fuel still in the reactors restricts many actions.Lack of operational and material data. Prepare for suprises andpay attention to documentation.Research reactors are also nuclear facilities, same requirementsfor licencing and documentation as for NPP’s.Waste activities and masses are small, but research reactorsoften include special materials. Especially important in wastefinal disposal planning.Train personnel for waste characterisation methods, clearancemeasurements etc. before starting the dismantling.
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor
1127/01/2017 11
Thank you for your attention!
http://www.vttresearch.com/services/low-carbon-energy/nuclear-energy/decommissioning-of-finlands-first-nuclear-reactor