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新型転換炉実証炉核設計コードの計算精度解析(II); 制御棒反応度価値及びDCA出力分布

The Calculation accuracy analysis of the core design code for ATR (Advanced Thermal Reactor) demonstration plant; Control rod reactivity worth and DCA power distribution

川太 徳夫*; 小綿 泰樹*; 若林 利男*

not registered; not registered; not registered

DCA制御棒挿入炉心実験データ及び「ふげん」起動試験実績データに基づいて、WIMS-ATRコードによる制御棒反応度価値及びチャンネル出力分布の計算精度解析を実施した。本検討で得られた主要な結果を以下に示す。(1)METHUSELAH-2コードと比べWIMS-ATRコードは制御棒反応度価値を4%$$sim$$9%大きく評価する傾向を示す。(2)拡散係数としてセル定数を使用した"新"吸収面積法を使用すればWIMS-ATRコードによる制御棒反応度価値の計算精度は-6%$$sim$$+8%であり、$$pm$$10%の設計誤差で十分と考えられる。(3)マルチセル計算手法は非均質の核定数を使用すれば$$pm$$5%程度の計算精度で制御棒反応度価値を計算することが可能と思われ、設計バックアップ手法として適宜使用することが望ましい。(4)WIMS-ATR/LAYMON-2Aコードによるチャンネル出力分布の計算誤差はRMSで2$$sim$$3%であり、実験値とよく一致している。

The calculation accuracy evaluation of the control rods reactivity worths and channel power distributions were performed on the basis of DCA experimental data and "Fugen" start-up test data by using the WIMS-ATR code. The main results which have been obtained are as follows. (1)It is proved that calculation values by the WIMS-ATR code over-estimates the B$$_{4}$$C control rods worths about 4%-9% compared with the METHUSELAH-II code. (2)The calculation accuracy of the B$$_{4}$$C control rods worths based on the "new" absorption area method used cell averaged diffusion constants by the WIMS-ATR code is about -6% $$sim$$ +8%. From this result, it is proposed to use $$pm$$10% as the design margin to the control rod reactivity worths. (3)It is considered that the multi-cell method using imhomogenious nuclear constants by using the WIMS-ATR code is able to estimate the control rods reactivity worths with the errors of about $$pm$$5%. Therefore, it is proposed to use the multi-cell analysis method as a detailed calculational method for reevaluation of design values for control rods reactivity worths. (4)The RMS (Root Mean Square) of the calculation errors of the cannel power distributions is about 2 $$sim$$ 3%. Therefore, it is shown that the calculational values by the WIMS-ATR code are in good agreement with the experimental data.

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