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Report No.
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Research and development of FLWR

Yamaji, Akifumi

An advanced LWR concept (FLWR) is being developed based on the well experienced LWR technologies for ensuring sustainable energy supply in the future. For developing the core concept, a light water fuel rod analysis code, FEMAXI-6 has been verified with MOX fuel rods irradiated at Halden. The results showed that uncertainties in fission gas release calculations were particularly high. The basic fission gas release mechanism of MOX fuels should be the same as that of UO$$_{2}$$ fuels, but the parameters in the model need to be revised for MOX fuels. More experimental data are needed. However, frequent reactor shutdowns and restarts may cause pellet relocation changes and give difficulties in code verifications.

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