| 摘要 |
PROBLEM TO BE SOLVED: To prevent a void reactivity coefficient from becoming positive, when acquiring a high converter by improving the core of a BWR (boiling water reactor) in operation at present. SOLUTION: Aluminum-fluorine zircaloy tube row 200 is arranged around a dense nuclear fuel assembly 130, and slow neutrons are not decelerated in a normal operation but fast neutrons are decelerated at a coolant flow decrease accident. COPYRIGHT: (C)2007,JPO&INPIT
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