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Measurement and analysis of reflector reactivity worth by replacing stainless steel with zirconium at the fast critical assembly (FCA)

ステンレス反射体からジルコニウム反射体への置換反応度価値に関するFCAを用いた実験及び解析

福島 昌宏; 北村 康則; 安藤 真樹; 久語 輝彦

Fukushima, Masahiro; Kitamura, Yasunori; Ando, Masaki; Kugo, Teruhiko

Zirconium alloy instead of stainless steel (SS) has been considered as an effective reflector to improve the neutron economy in the experimental fast reactor JOYO. The aim of the present study is to demonstrate the effectiveness of the zirconium (Zr) reflector compared with the SS reflector in a fast reactor core. The FCA-XXVIII-1(3) core was built at the fast critical facility (FCA) and the reflector reactivity worth was measured by replacing SS with Zr at the peripheral region of the core. The experimental result of the positive reflector reactivity worth demonstrates the effectiveness of the Zr reflector compared with the SS reflector in the fast reactor core. This paper also focuses on the validation of standard calculation methods used for fast reactors with JENDL-4.0. As a result, it is confirmed that the standard calculation methods for the reflector reactivity worth show agreement within the experimental error.

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