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JOYO MK-III performance test at low power and its analysis

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千葉 豪; 横山 賢治   ; 関根 隆 ; 前田 茂貴   

Chiba, Go; Yokoyama, Kenji; Sekine, Takashi; Maeda, Shigetaka

「常陽」MK-III炉心において、低出力性能試験が行われ、制御棒価値、等温温度係数、過剰反応度といった核特性パラメータを測定した。測定値の誤差も詳細に評価した。サイクル機構の標準核特性解析システムを用いた解析を実施し、測定値とのよい一致を得た。標準解析手法に加えて、反射体領域の実効断面積評価手法および断面積の不確かさに起因する計算値の誤差の評価も行った。

Performance test at low power had been carriod out in the experimental fast reactor JOYO. In the test, several neutronics characteristics had been measured. For the analysis, a deterministic standard calculation route of JNC was adopted and good agreements with the measured values were obtained. We also evaluated a sensitivity of the evaluation method of the self-shielding effect in the reflector subassemblies to the neutronics characteristics and the calculation uncertainty indeced by the uncertainty of cross sections.

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