| 摘要 |
PROBLEM TO BE SOLVED: To reduce a coolant void reactivity by reducing a coolant volume ratio in an inner region of a core. SOLUTION: Metal fuel is used and the core 10 is partitioned in a plurality of regions for flattening power distribution. For the metal fuel, TRU-Zr ternary alloy with U-Pu or Pu as a main composition is used. All fuel pins have a uniform Pu enrichment in the fuel and the same pin diameter. A Zr content in metal fuel slug in inner core fuel pins 22 has larger value than that of outer fuel pins 24. Fuel assemblies have a structure installed with a multitude of fuel pins in a wrapper tube with the same array. Individual fuel pins are kept at a constant interval by wire type spacers. COPYRIGHT: (C)2005,JPO&NCIPI
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