MULTIDISCPILINARY DESIGN OF THE SPACER GRID ASSEMBLY FOR PWR FUEL

概要

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A spacer grid assembly is one of the structural core components of nuclear fuel assemblies for pressurized light water reactors (PWRs). Recently the spacer grid assembly with mixing vanes is prevailing to enhance the thermal hydraulic performance of the fuel assembly. Then the mixing vanes are known both to enhance the flow mixing and to be susceptible to the fuel rod vibration. However the design of the spacer grid assembly is carried out independently in the mechanical/structural view-points and thermal hydraulic view-points. In PWR fuel assemblies, spacer grid assemblies with springs and dimples should support the nuclear fuel rods laterally and vertically during 3 to 5 years in the reactors in order to maintain fuel rod and fuel assembly integrity. Therefore, various designing points, such as, spacer grid spring characteristics, fuel rod vibration characteristics, fuel rod fretting resistance, and the buckling strength of the spacer grid should be considered in the design stage of the spacer grid assembly. In this paper, the designing activities including design optimization only considering the mechanical/structural view-points and its results are introduced and discussed.
一般社団法人日本機械学会の論文
2006-12-12