| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reactor of low Pu generation by improving the core of a BWR under operation. Ž<P>SOLUTION: Pellets having higher degree of U233 enrichment is filled into the upper part of a TMOX obtained by easy reprocessing, and pellets where enriched uranium is added to Th are deposited and filled in the bottom part, and a thorium-based nuclear fuel assembly 130, where many thorium-based nuclear fuel rods 131 are arranged in a square form and a boronized titanium control rod 101 are loaded in the core of the BWR currently in operation. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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