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Report No.

Breeder-type operation based on the LWR-MOX fuel technologies in light water reactors with hard neutron spectrum (FLWR)

Uchikawa, Sadao; Okubo, Tsutomu; Nakano, Yoshihiro 

An advanced LWR concept, FLWR, is a BWR type reactor, in which the moderation of neutron in the core is reduced by use of tight-lattice fuel rod configuration. It aims at realizing effective and flexible utilization of uranium and plutonium resources by two stages, corresponding to the advancement of the fuel cycle technologies and related infrastructure. The present paper has proposed advanced fuel and core designs for realization of breeder-type operation in the first stage of FLWR. To achieve a high fissile-plutonium conversion ratio over 1.0, a new design concept of the MOX fuel assembly has been developed, in which MOX rods are arranged in the central region of the assembly, while enriched UO$$_{2}$$ rods in the peripheral region of the assembly. Performance evaluation shows that the proposed concept is feasible and promising under the framework of the UO$$_{2}$$ and MOX fuel technologies and related infrastructures, which have been established for the current LWR-MOX utilization.



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