Zirconium-based alloy for boiling water type light water reactor fuel assemblies and boiling water type light water reactor fuel assemblies

摘要

PROBLEM TO BE SOLVED: To provide a zirconium-based alloy for reactor fuel assembly that exhibits superior nodular corrosion resistance and hydrogen absorption resistance characteristics even in a nuclear reactor after long-time operation under a condition of a high degree of combustion, and a reactor fuel assembly using the same.SOLUTION: There is provided a Zr-based alloy that includes Sn, Fe, Cr, Ni, Si, and Zr, where a value [Ni] (unit: mass%) of a content of a Ni component is 0.005-0.04, an inequality (1) of 0.8([Cr]+[Ni])/(10×[Si])1.5 holds for a value [Cr] (unit: mass%) of a content of a Cr component, a value [Si] (unit: mass%) of a content of a Si component, and the value [Ni], and an inequality (2) of P4500×[Ni]+120 holds for a value P (unit: nm) of a particle size of a contained inter-metal compound.