ZIRCONIUM BASE ALLOY, FUEL ASSEMBLY FOR WATER-COOLED NUCLEAR POWER REACTOR USING THE SAME, AND CHANNEL BOX

摘要

PPROBLEM TO BE SOLVED: To prevent corrosion and hydrogen absorption of a zirconium base alloy. PSOLUTION: When it is assumed that a tin concentration, an iron concentration, and a chromium concentration are CSBSn/SB(mass%), CSBFe/SB(mass%), and CSBCr/SB(mass%), respectively, alloy components of the zirconium base alloy to be used for a fuel rod 14, a spacer 17, a water rod 22, or a channel box 23 of a fuel assembly 10 to be loaded into a water-cooled nuclear power reactor satisfy CSBSn/SB1.2, 0.5CSBFe/SB+CSBCr/SB0.8, and 0.26CSBFe/SB/CSBCr/SB1.7, and include one or more elements to be chosen from among vanadium, lanthanum, praseodymium, and germanium. When it is assumed that a total element concentration of four types of elements of vanadium, lanthanum, praseodymium, and germanium is CSBx/SB(mass%), it is desired to satisfy 0.1CSBx/SB0.31. PCOPYRIGHT: (C)2010,JPO&INPIT