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Report No.
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Fuel assembly design for plutonium conservation in a light water reactor with hard neutron spectrum

Uchikawa, Sadao; Okubo, Tsutomu; Nakano, Yoshihiro

The FLWR is a BWR-type reactor with hard neutron spectrum based on the well-experienced LWR technologies. The present paper has proposed a new concept of the fuel assembly design for the first stage of FLWR to conserve plutonium effectively with a fissile-plutonium conversion ratio of around 1.0, keeping negative void reactivity characteristics. The enriched UO$$_{2}$$ fuel rods are arranged in the peripheral region of the assembly, surrounding the MOX fuel rods in the central region. Performance evaluation shows that the FLWR/MIX concept is effective for controlling the void reactivity characteristics in the tight-lattice fuel rod configuration 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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Category:Nuclear Science & Technology

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