Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 146 / 257 The concrete structure of the vault ensures the protection of fuel assemblies from external events and protects workers and local residents from irradiation. The sealed canisters and the closed wells prevent radioactive releases to the environment. In France, the CASCAD facility, designed for 50 years of interim storage, was the first to use natural convection to cool the storage wells where the canisters containing spent fuel are kept. FIGURE 57:CASCAD DRY STORAGE FACILITY: CANISTER LOADING This technology is also used in the Netherlands in COVRA’s Habog facility (see Figure 58). This facility accommodates not only fuel canisters but also glass canisters and intermediate level waste containers.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 147 / 257 FIGURE 58:GENERAL VIEW OF COVRA HABOG FACILITY, NETHERLANDS A multipurpose interim storage facility using vaults has been designed for ENRESA, in Spain. This facility provides storage for spent fuel (with characteristics similar to EPR fuel) in vaults cooled by natural air ventilation and also provides separate storage for solid waste stored in bunkers cooled by forced air ventilation. This type of multipurpose dry vault storage system offers a number of significant advantages including: · Multiple containment systems, with the sealed canister, the closed storage well and the building ventilation system all serving to prevent radioactive releases to the environment; · Safe and secure containment of spent fuel within the canister during any necessary handling operations. The canister also incorporates features to facilitate secure movement by overhead crane, thereby minimising the risk of a dropped load; · Passive cooling of stored spent fuel assemblies by natural air convection. The storage vault temperature is kept low so that the cladding temperature can be maintained under 380°C, even under extreme conditions.380°C, even under extreme conditions.
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A 2008-11-26 Sarah Greenwood Gary C
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