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Safe Controlled Storage of SVBR-100 Spent Nuclear Fuel in the Extended-Range Future

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Document pages: 13 pages

Abstract: Experience of operating reactorfacilities (RF) with lead-bismuth coolant (LBC) has revealed that it ispossible to perform safe refueling in short terms if the whole core is replacedand a kit of the special refueling equipment is used. However, comparing withRFs of nuclear submarines (NS), in which at the moment of performance ofrefueling the residual heat release is small, at RF SVBR-100 in a month afterthe reactor has been shut down, at the moment ofperformance of refueling the residual heat release is about 500 kW. Therefore,it is required to place the spent removable unit (SRU) with spent fuelsubassemblies (SFSA) into the temporal storage tank (TST) filled with liquidLBC, in which the conditions for coolant natural circulation (NC) and heat removalvia the tank vessel to the water cooling system are provided. After the residualheat release has been lowered to the level allowing transportation of the TSTwith SRU in the transporting-package container (TPC), it is proposed toconsider a variant of TPCs transportation to the special site. On that site after the SRUhas been reloaded into the long storage tank (LST) filled with quicklysolidifying liquid lead, the TPCs can be stored during the necessary period.Thus, the controlled storage of LSTs is realized during several decades untill the time when SNF reprocessing and NFC closing are becoming economicallyexpedient. On that storage, the four safety barriers are formed on the way of the release of radioactive products into the environment, namely: fuel matrix, fuelelement cladding, solid lead and steel casing of the LST.

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