Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 142 / 257 9.3.1.2.2 Spent Fuel Dry Storage A number of dry storage technologies have been developed in the past 15 years. This report describes four potential options that have been identified for possible use in the UK EPR however, as technology in this area develops new storage products may become available and be considered for use in the EPR. The four potential options described in this report are as follows: · Dry storage in a metal flask; · Dry shielded canisters in concrete storage modules (e.g.NUHOMS); · Dry shielded canisters in vertical storage modules (TN NOVA); · Dry storage in a vault. These dry storage options are discussed in more detail below. Dry Storage in a Metal Flask The metal flask is a dual purpose technology for both spent fuel transport and interim storage. This technology is used in Germany, Switzerland and Belgium. The steel containment vessel provides the main gamma shielding and an external layer of resin covered by an outer steel shell provides shielding against neutrons. Criticality is controlled by an internal basket made of boronated alloys. FIGURE 52: DUAL PURPOSE STORAGE/TRANSPORT METAL FLASKS
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 143 / 257 Dry storage in concrete storage modules (e.g. NUHOMS® ) NUHOMS® is a proven system for dry storage which has been in use at reactor sites since March 1989. The NUHOMS® system provides containment, shielding, criticality control and passive heat removal independent of any other facility structures or components. NUHOMS (NUTECH Horizontal Modular Storage) technology involves: · A Dry Shielded Canister (DSC) is inserted inside a site transfer cask; · Placing spent fuel in a Dry Shielded Canister (DSC) underwater; · The DSC is drained, sealed, vacuum-dried and filled with helium (line removed); · The transfer cask is placed in a horizontal position on a transport trailer and moved to the HSM site; · The cask including the loaded DSC is used to transport the spent fuel to the interim storage facility; · The site transfer cask is aligned with a Horizontal Storage Module (HSM). The HSMs are massive concrete structures and provide shielding and security for safe interim storage; · The DSC is pushed out of the site transfer cask and into the HSM; · The HSM is sealed and the site transfer cask reused to transfer other DSCs. The HSM provides radiological shielding and physical protection for the Canister against a wide range of postulated natural hazards. The Module has internal air flow passages to provide natural convection cooling for removal of decay heat from the Canister’s spent fuel. FIGURE 53: THE NUHOMS SYSTEM
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A 2008-11-26 Sarah Greenwood Gary C
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