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By International Atomic Energy Agency

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The UKAEA produced 13 t HM FBR fuel between 1970 and 1988 in a now decommissioned plant at Sellafield. In the early 1990s, UKAEA, acting for BNFL, 26 equipped the MOX Demonstration Facility (MDF) in a building at Sellafield that housed MOX fuel development facilities. Both MDF and the UKAEA team were soon thereafter incorporated into BNFL. The purpose of MDF was to gain commercial experience on manufacturing and inspecting thermal MOX fuel in preparation for the large scale Sellafield MOX Plant (SMP) project.

It minimizes fission gas release (FGR) and the resulting rod internal pressure. This aspect will be elaborated in Section 5. The degree of macrohomogeneity depends on the sophistication of the blending technology. Great efforts at optimizing the blending equipment and procedure have been made at each fabricator. All other factors being equal, the fabrication routes involving a progressive dilution of PuO2 into UO2 can more easily achieve macrohomogeneity than the processes that directly mix PuO2 and UO2 to the final required composition.

QUALIFICATION OF NEUTRONIC FUEL ASSEMBLY AND CORE DESIGN METHODS Modern low leakage core designs together with the higher enrichments of uranium and MOX fuel assemblies places increasing demands, with respect to accuracy and reliability, on the design codes. For normal applications, qualified design codes prove to be adequate, accurate and efficient. Current nuclear design 46 TABLE V.

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