Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 248 / 257 14.1.2 Guides The following safety guides are used for the transport of radioactive material: · Guide to an Application for UK Competent Authority Approval of Radioactive Material in Transport, Department of the Environment, Transport and the Regions, January 2001; · Safety Guides N° TS-G-1-1, “Advisory Material for safe Transport of Radioactive Materials”, International Atomic Energy Agency (IAEA), Edition 2002. 14.2 Waste And Spent Fuel Transport Arrangements 14.2.1 Waste Package Transportation TNI has also developed and implemented various solutions for nuclear waste packages which require specific transportation arrangements. The following are examples of suitable containers for different types of irradiated waste. Other types of packages, which also comply with international transport regulations could be chosen by a utility. 14.2.2 Spent Fuel Transportation For the transport of spent fuel offsite, an IAEA type (B) transport container is required. TN International (TNI) has already designed and implemented various solutions that comply with transport regulations. With reference to the specific case of EPR spent fuel, the first solution that would be considered would be the TN-DUO type transport and storage cask, described earlier in this document, which is a storage solution compatible with transport requirements. It is important to note that other types of package designs may be employed. For transportation purposes only, TNI has designed and implemented a number of transportation casks which have been routinely used since the 1980s. More than 200 transports of spent fuel are undertaken every year in Europe. As shown below, the TN TM 13-2 cask can be adapted for the carriage of EPR spent fuel. Main design characteristics of the TN TM 13-2: Overall length with shock absorbers: 6670 mm Maximum diameter with trunnions:2500 mm Maximum weight loaded with shock absorbers: 113.5 tons Internal diameter of the cavity: 1220 mm Weight empty: 103.4 tons Pay-load: 12 PWR 15x15 or 17x17 (reactor 1300 or 1450 MW)
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 249 / 257 SPACER FORGED STEEL BODY RESIN TRUNNION SHOCK ABSORBING COVER PROTECTION LID FIXING FLANGE PLUG DRAINING PLUG COOLING FINS SKIRT SUPPORT RING SHOCK ABSORBER Cask performance: FIGURE 105: TN TM 13-2 CASK · PWR 15x15 or 17x17 (reactor 1300 or 1450 MW); · Maximum thermal power: 64.5 kW without canopy; · Maximum enrichment in U5: 4.3%; · Maximum burn-up: 52,500 MWd/tU; · Minimum cooling time: 120 days. The TN TM 13-2 is composed of a body in forged steel structure designed for fire resistance and containment integrity, both after 9 m regulatory drop tests and the punch test. The subassemblies of the cask satisfactorily perform the various functions that are essential to safety. The transport cover acts as a mechanical shock absorber during severe impacts or shocks, and thermal insulation for the cask lid in case of fire. The body and the closing system guarantee that radioactive materials will be confined, reduction of radiological radiation emitted by radioactive materials and dissipation of thermal power released by radioactive materials. This cask is composed of the following subassemblies: · The basic structure is a cylindrical receptacle formed mainly from a thick shell made of carbon steel comprising an internal cylindrical cavity in which the spent fuel to be transported are placed. The thickness of the forged steel shell forms the main gamma shielding; · The body is equipped with bolted removable trunnions for handling, tilting and stowing, · Inside the cavity, an aluminium basket is fitted and provides a structural support for the spent fuel; · Surrounding the cylindrical forged body resin provide neutron shielding features of the cask. The lid is also equipped with a similar neutron shielding. Shaped copper plates separating resin compartments, crimped along their length by welding cover plates forming the outer envelope, and in tangential contact with the forged shell, ensure the thermal evacuation of the heat power released by the spent fuel to the outer shell, itself in contact with ambient air; · Two shock absorbers are placed on the top and the bottom of the cask for lateral and axial drops.
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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