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FCAにおける低減速軽水炉模擬炉心の無限増倍率の測定

Measurement of infinite multiplication factor in the mock-up core for reduced-moderation water reactor at FCA

小嶋 健介; 岡嶋 成晃; 山根 剛; 安藤 真樹; 片岡 理治*; 岩永 宏平

Kojima, Kensuke; Okajima, Shigeaki; Yamane, Tsuyoshi; Ando, Masaki; Kataoka, Masaharu*; Iwanaga, Kohei

低減速軽水炉の重要な炉特性であるボイド係数の評価の一環として、FCA-XXII-1(65V)の炉心テスト領域の無限増倍率を測定した。4種類の小型核分裂計数管を用いて測定した軸方向・径方向の核分裂率分布からテスト領域の材料バックリングを求め、計算により得られた移動面積を用いて無限増倍率を評価した。その結果、同炉心テスト領域の無限増倍率は1.344$$pm$$0.034となり、無限増倍率の計算値の測定値に対する比は1.008$$pm$$0.026となった。また、測定精度の向上のための方策について検討した。

To investigate the void coefficient in the Reduced-Moderation Water Reactor (RMWR), an infinite multiplication factor was measured in the FCA-XXII-1 (65V) core. Axial and radial fission rate distributions were measured by micro fission chambers with four different kinds of nuclides. The infinite multiplication factor was derived from the material buckling, which was obtained from both the axial and radial fission rate distributions, and the migration area calculated. The value of it in the test region of the FCA-XXII-1 (65V) core was 1.344$$pm$$0.034. It was compared with the calculation, the ratio of the calculation to the measurement was 1.008$$pm$$0.026. The improvement in measurement accuracy was also considered.

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