Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 224 / 257 The design of the proposed transport and storage systems shall meet all safety requirements imposed by UK Regulations. The flask is designed to meet type B(U)F package requirements. As a consequence, its compliance with the IAEA normal and accident transport requirements is ensured. Radioactive contamination The flask must provide the containment of the nuclear material retained in the package (§ 656, TS-R-1, 2005 edition). In normal conditions of storage, the maximum allowed leakage rates for the total primary confinement boundary and redundant seal in normal conditions will be defined so as to ensure that thank to the fact that the volume between the redundant seal is pressurized and monitored, no leakage to the environment occurs. The leakage analysis will be consistent with an internationally recognized standard, such as the “Safe transport of radioactive materials – Leakage testing on packages” (ISO 12807 - 1996) or the "ANS for Leakage Tests on Packages for Shipment of Radioactive Materials" (ANSI N14.5 - 1997). Shielding The flask is designed to meet the IAEA radiation levels (§ 572, TS-R-1, 2005 edition): · Maximum dose rate in normal transport conditions: o 2 mSv/h on the external surfaces of the package, o 0,1 mSv/h at 2 meters from the vehicle lateral surface. · Maximum dose rate after regulatory accidental test: o 10 mSv/h at 1 meter from surface of the flask. In the storage configuration, the effective dose rate around the flask will meet the limits required by the regulations. The flask has either a stainless steel or painted decontaminable surface so that surface contamination should not exceed the limits defined in paragraph 656, TS-R-1, 2005 edition. Criticality The flask must maintain the fuel in a subcritical condition under all credible normal, offnormal and accident conditions (§ 671 to 682, TS-R-1, 2005 edition).. Analysis is performed for a flask in any position under normal or accident conditions. Heat dissipation The design will assure that the flask and the fuel material temperatures will remain within the allowable values and criteria for normal and accident conditions. Fuel cladding maximum temperature at the time of initial flask loading shall be below the anticipated damage-threshold temperatures for normal conditions.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 225 / 257 Tip over Tip over is postulated to occur during handling. Handling equipment will be interlocked to not exceed the maximum safe transfer speed. Fire The design will take into account all fire-related structural considerations, including increased pressures in the containment vessel, changes in material, stresses caused by different coefficient of thermal expansion and/or temperature in interacting materials in order to preserve the safety function of the storage system. The flask has been designed to withstand a fire caused by an aircraft fuel tanker releasing 6000 litres of kerosene. This fire scenario is considered to be more severe than a fire of 800°C lasting for 30 minutes. External events: Flooding The flask withstands loads from forces developed by the probable maximum flood including hydrostatic effects and dynamic phenomena. Earthquakes Flask systems shall be designed against a suite of vibratory ground motions, which together define the Design Basis Earthquake (DBE). Aircraft crashes Flask equipped with a dedicated cover is designed against an aircraft crash. Flask burial after over building collapse The safety functions of the flask shall be assured even assuming a complete collapse of the sheltering building onto the flask. The flask integrity and the heat removal conditions demonstrate that the consequences of collapse over building are acceptable when compared with those for other accident conditions.
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A 2008-11-26 Sarah Greenwood Gary C
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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