Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 214 / 257 Aircraft crash Facilities are designed against an aircraft crash. 13.2.5 Building Operations 13.2.5.1 General Considerations There will be three broad operational periods for the storage facility. The first period will be when spent fuel is being received and placed into the interim storage pools. This period will start within 10 years of the reactor start date, since the fuel will need to be stored in the reactor cooling pool for up to 10 years before it can enter interim storage. This first period will finish about 10 years after the reactor ceases operations and the last batch of fuel has completed its initial cooling period. (Note, the reactor is designed for an operational lifetime of 60 years.). There will then be a period when there are no loading or unloading operations, although monitoring of storage conditions will continue. This is expected to last 30 or 40 years, depending upon developments in the UK radioactive waste strategy and the availability of the Geological Disposal Facility. The final period is when the stored fuel assemblies are retrieved and exported to another facility. After this the facility will be decommissioned. The facility is therefore expected to have an operational life of around 100 years. An EPR reactor core has 241 fuel assemblies and it is assumed that the core renewal is completed every 18 months, with about one third of the fuel assemblies being replaced each time. The baseline design assumption for the interim storage facility is that it will serve a single reactor with an average of 3400 fuel assemblies requiring storage. 13.2.5.2 Operational Data Operations in the transport container reception, preparation and shipping building are performed manually by operators, using overhead cranes for transport container handling and a protective platform for transport container preparation operations before docking. In the process building, all operations are performed remotely from a centralised control room, namely: · Transport container docking/undocking operations; · Spent fuel unloading operations and subsequent cooling/rinsing; · Loading of baskets into the transfer device and movement through the transfer channel. The mast crane operations in the pool storage building are also fully automated and remotely controlled from the centralized control room although all systems can be operated manually if necessary. It should be noted that optimal operating conditions are maintained by routine maintenance of pool equipment. The exposure of workers to radiation is minimised by appropriate ventilation, shielding, minimisation of waste, routine monitoring and maintenance of dose records.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 215 / 257 13.3 Dry Interim Storage Facility 13.3.1 The Metallic Flasks Technology – The TN DUO Spent fuel assemblies can be safely stored in a dual purpose metallic flask, the TN DUO, which is designed for both transport and storage configurations. (TN DUO is an evolution of the TN 24 cask family). 13.3.1.1 Functions and Process system Dry flask storage allows spent fuel that has already been cooled in the spent fuel pool to be surrounded by inert gas inside a container called a flask. The flasks are typically steel cylinders that are either welded or bolted closed. The steel cylinder provides a leak-tight containment of the spent fuel. Each cylinder is surrounded by additional steel, concrete, or other material to provide radiation shielding to workers and members of the public. Some of the flask designs can be used for both storage and transportation. The dry flasks could be stored outside or inside a dedicated building. From the technical point of view, the safety of the storage facility is based on the flask. Indeed the flask has been designed to withstand all accident conditions without taking into account complementary protection system such as a building 13.3.1.2 General description of the TN DUO dual purpose flask The TN DUO dual-purpose flask is mainly constituted of: · Two truly redundant and independent containment barriers: a canister (first containment barrier), and a flask body (second containment barrier) closed by two bolted lids; · A basket to host the spent fuel assemblies; · The shock absorbing covers in transport configuration, an anti-aircraft crash cover in storage configuration. The safety is mainly ensured by the mechanical properties of the flask body equipped with its shock absorbing covers. It insures shielding and the transfer/dissipation of the decay heat.
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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