Fig. 1-3

Concept of Innovative Water Reactor for Flexible Fuel Cycle (FLWR) FLWR realizes multiple recycling and breeding of Pu, which enables effective utilization of the U resource, and is based on well-developed LWR technologies. This reactor is thus expected to contribute to future sustainable energy supplies. Two steps to develop the FLWR offer flexibility for the future nuclear fuel cycle situation. In the first step, the reactor uses the same reactor plant system as a conventional LWR except for the core, which adopts MOX fuel rods arranged in a triangular lattice in the hexagonal fuel assemblies. The second step, which would start when reprocessed spent MOX fuels become available, would use the same size hexagonal fuel assemblies as in the first step, but with a different fuel configuration in the fuel assemblies to improve reactor core performance.

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