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Report No.
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Early introduction core design for advanced LWR concept of FLWR to recycle Pu or TRU

Okubo, Tsutomu; Nakano, Yoshihiro ; Uchikawa, Sadao; Fukaya, Yuji   

An advanced LWR concept of FLWR is proposed to contribute to sustainable energy supply in the future by recycling Pu or TRU based on well-developed LWR technology. The concept utilizes the tight-lattice core with MOX fuel, and consists of two steps in the chronological sequence. The first is to realize early introduction of FLWR by a high conversion type one (HC-FLWR), which is to keep the smooth technical continuity from LWR/MOX-LWR technologies. The second is represented by RMWR, which realizes a very high conversion ratio over 1.0 and is for the long-term sustainable energy supply through Pu or TRU multiple recycling. The key point is that the two core concepts utilize the compatible and the same size fuel assemblies, and hence, the former concept can proceed to the latter in the same reactor system based flexibly on the future fuel cycle circumstances. In the present paper, the design of the early introduction core for FLWR is presented as well as the core design strategy.

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