Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 208 / 257 To ensure criticality control, baskets are stored in fixed locations to maintain a safe geometry. This fixed layout also ensures that there is adequate space for moving baskets as a part of normal storage and retrieval operations. 13.2.2.4 Cooling Of Storage Pool The decay heat produced by the stored fuel assemblies is dissipated by the pool water. To maintain the pool water temperature below 45°C during normal operating conditions (and below 70°C during accidental modes) the interim storage pool includes a cooling system. The system is based on the AREVA-designed heat exchangers composed of: · A set of heat exchangers submerged in the storage pool (each having a nominal power dissipation of 1 MW); · A set of compact forced draught external cooling towers dissipating the heat (with an individual power dissipation of 2 MW). A key feature of this design is that the radioactive portions of the cooling network remain within the pool and the use of closed-circuit systems drastically limits the amount of effluent generated. The base case of storing EPR spent fuel from a single reactor in an interim storage pool has been calculated to generate up to 5 MW of residual heat. The pool will therefore contain 5 heat exchangers and 3 external cooling towers. The cooling towers will be constructed outside the spent fuel facility. a) Heat exchanger functional description The heat exchangers are submerged vertically and fixed on the storage pool side walls. Each is composed of 3 removable and distinct parts: · A supporting structure, including a stirring mechanism; · A bundle of tubular heat exchangers; · A pump (above the water level) to circulate the pool water inside the heat exchanger tubes. b) Equipment outside the pool The cooling towers are located outside the pool building. Their tubular water/air heat exchangers have fans to induce forced cooling. A set of pumps circulates the cooling water between the heat exchanges and the cooling towers.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 209 / 257 FIGURE 79:TYPICAL COOLING SYSTEM OPERATING DIAGRAM 13.2.2.5 Purification Of Storage Pool Water The chemical contamination of the water must be controlled to ensure the integrity of the fuel cladding, the pool steel lining and the process equipment. Pool cleaning also serves to keep the water clear and to prevent or minimise the build up of material on the bottom of the pool. a) Ion exchanger Units - functional description and sizing To maintain acceptable chemical conditions in the pool, water is continuously purified by AREVA-designed ion exchangers. These are submerged in the storage pool and each unit is able to purify the storage water of the equivalent of 500 tonnes of uranium fuel. For the UK EPR spent fuel interim storage pool, assuming an average of 1800 tonnes of uranium produced, a total of 3 or 4 units would be needed. As with the heat exchangers, the ion exchangers are submerged vertically and fixed on the side walls of the storage pool. Each is composed of: · A supporting structure with water inlet and outlet; · An above water pump to circulate water. · Anionic resin and cationic resin, each conditioned in removable cartridges for ease of maintenance.
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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