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高速炉燃料集合体内詳細熱流動解析手法の開発,12; 内部ダクト型燃料集合体への適用解析

Development of a numerical simulation program for detailed thermal hydraulics in fast reactor fuel assembly, 12; Analysis of a fuel assembly with an inner duct structure

菊地 紀宏  ; 今井 康友*; 大島 宏之; 田中 正暁  

Kikuchi, Norihiro; Imai, Yasutomo*; Ohshima, Hiroyuki; Tanaka, Masaaki

高速炉燃料集合体熱流動詳細解析コードSPIRALの適用解析の一環として、炉心損傷事故対策として設計検討が進められている溶融燃料排出ダクト付き燃料集合体(FAIDUS)を対象とした小規模体系での予備的解析を実施した。解析は、内部ダクトのない37本燃料ピン体系(標準型体系)およびラッパ管コーナー部の4ピンを除いて内部ダクト領域を設定した体系(内部ダクト型体系)で実施した。内部ダクト型体系と標準型体系の燃料集合体内熱流動解析結果から、内部ダクトの存在が集合体内温度分布に与える影響は限定的であること、また、圧力損失係数もその変化がほとんど認められないことを確認し、SPIRALのFAIDUS型集合体への適用性について確認した。

A computer program SPIRAL, which has been developed for detailed thermal-hydraulic analyses in a fuel assembly of sodium-cooled fast reactors, was applied to a preliminary analysis of an FAIDUS (Fuel Assembly with an Inner Duct Structure)-type fuel assembly for investigating the applicability of the program and clarifying thermal-hydraulic characteristics of FAIDUS. Numerical simulations were conducted for a FAIDUS-type 33-pins assembly in which 4-pins located at a corner of hexagonal wrapper tube were removed to simulate inner duct part and a 37-pins assembly without inner duct part (reference case). The comparison of two cases showed that the inner duct structure had limited effect on the temperature distribution in the fuel assembly and the pressure loss coefficient was mostly unchanged. Through the numerical simulations, the applicability of SPIRAL to the FAIDUS-type assembly was confirmed.

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