Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 102 / 257 Years from Decommissioning No. Task -1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 DISMANTLING OF 1 EPR UNIT 2 Cessation of unit operation 3 Permanent shutdown of the unit 4 Dismantling of the unit 5 Nuclear Auxiliary Building 6 Fuel Building 7 Reactor Building 8 Auxiliary circuit dismantling prior to primary circuit 9 Dismantling of primary circuit 10 Dismantling of the 4 loops with SG evacuation 11 Dismantling of the SG in a dedicated workshop 12 Dismantling of RPV, intervals and reactor pit 13 End of dismantling of auxiliary equipment 14 RB decontamination and cleaning 15 Other buildings (safeguard building, waste building…) 16 Demolition of buildings SG – Steam Generator RPV – Reactor Pressure Vessel RB – Reactor Building FIGURE 26: INDICATIVE DISMANTLING PROGRAMME FOR ONE EPR UNIT
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 103 / 257 The dismantling scenario for the primary circuit is as follows: · Preliminary decontamination of the primary circuit with CORD-UV type process in order to: o o Reduce dose rates to allow contact (“hands-on”) dismantling of many of the primary circuit components; Minimise volume of packed waste (reduction of required biological shielding) even with production of secondary waste (Ion exchange resins). · Preparation for primary circuit dismantling, dismantling of last auxiliary pipes; · Export of the steam generators out of the reactor building for dismantling in a dedicated workshop: o o Separation and export of the upper sections of the steam generators to a noncontamination area workshop (the upper sections will have only contacted fluids from the secondary reactor circuits and thus would be highly unlikely to be significantly contaminated); Export of the lower steam generator section (containing the primary circuit tube bundle) to the contamination area workshop constructed to accommodate this size of component. · Export and dismantling of the reactor coolant pumps; · Dismantling and export of the main coolant pipes; · Export and dismantling of the pressuriser; · Preparation for internals dismantling with adjustment of the water level in the reactor compartment; · Dismantling of upper core internals associated with the pressure vessel head under water on its storage stand in the reactor pool (the pressure vessel head is removed for refuelling the reactor and has a dedicated storage stand within the reactor pit; · Dismantling of thermal shield in the reactor compartment pool; · Dismantling of lower core internals under water, on its storage stand in the reactor compartment pool; · Dismantling of reactor pressure vessel; · Dismantling of reactor vessel head; · Dismantling of activated part of the reactor compartment (the first 60 cm depth of concrete at the level of the reactor core); · End of primary circuit dismantling - Radiological decontamination and demolition of the buildings. This scenario for primary circuit dismantling and, by extrapolation, the complete reactor site dismantling, is based on: · Use of currently practised, realistic and achievable operations and techniques guaranteeing the control of the dismantling; feasibility is demonstrated through the use of techniques validated worldwide. · Technical choice and operation modes reducing dose uptake to operators and members of the public:
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A 2008-11-26 Sarah Greenwood Gary C
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