Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 124 / 257 9.1.2 Thermal Characteristics The EPR reactor is designed to use both MOX and uranium oxide fuels. For the purposes of this report it is assumed that the reactor uses uranium oxide fuel only. The uranium oxide fuel is designed with a variety of enrichments, the maximum being 5%. The isotopic composition of the spent fuel depend upon the initial enrichment, whether the fuel has been produced from natural uranium only or whether reprocessed uranium has been used and the fuel management regime conditions to which it is subject in the reactor. The average core region fuel burnup is less than 65,000 MWd/tU. Spent fuel assemblies are discharged from the reactor and placed into the spent fuel pool to cool and decay for a period of about 10 years before being moved to an interim storage facility. The decay heat generated by an EPR spent fuel assembly (fuel manufactured with natural uranium) which has undergone four 13 month reactor cycles and 10 years of cooling in the Spent Fuel Pool is approximately 1,400 Watts at the time of interim storage. A spent fuel assembly manufactured from reprocessed uranium, under the same conditions, would have a heat output of 2000 Watts. 9.1.3 Spent Fuel Quantities The UK EPR is designed for an operational life of 60 years. At any given time the operational reactor will contain around 127 tonnes of enriched uranium fuel. Reactor refuelling will take place at the end of reactor cycles which can range between 12 and 22 months depending on the fuel management regime adopted. The quantities of spent fuel discharged from the reactor during refuelling can be up to 80 assemblies. The EPR produces between 40 and 60 spent fuel assemblies per year of operation. The number of fuel assemblies produced over the operation of the EPR is 3400 (this equates to 1794 te of uranium). 9.2 Summary of Core Activated Components During the operation of the UK EPR, a number of core components used to control or measure neutron activity will need to be replaced during outages. These components when removed from the reactor are highly activated and transferred to the Spent Fuel Pool where they are left to radiologically decay.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 125 / 257 TABLE 39: WASTE STREAM DATASHEET FOR CORE ACTIVATED COMPONENTS Waste Component Waste Classification at Time of Production Rate of Production Total Quantity Expected over 60 year operational phase of EPR Rod Cluster Control Assemblies (Spider + 24 clad AIC-B 4 C absorbing rods) In core Instrumention (Aeroball finger tubes) HLW/ILW HLW/ILW 89 RCCAs replaced every 15 years 12 fingers replaced every 15 years (components) 356 48 These components could be dismantled and packaged inside the Spent Fuel Pool and transferred by flask to the Interim Storage Facility for further decay.
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Solid Radioactive Waste Strategy Report.pdf - UK EPR

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