提高子群法共振自屏计算精度研究

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Improvement of Accuracy of Resonance Self-Shielding Calculation Based on Subgroup Method

1. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China;
2. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 基于自行研制的子群法与特征线法相结合的中子共振自屏计算程序SGMOC,研究提高子群法计算精度的2种方法。数值验证表明,2种方法都能提高共振自屏计算精度。其中,采用随机干涉近似求解条件概率的共振干涉效应处理的修正效果约为（0.02%~0.23%）△k/k;考虑共振散射的修正效果约为0.1%△k/k;综合运用2种方法的修正效果约为（0.03%~0.27%）△k/k。
- 共振自屏 /
- SGMOC /
- 共振干涉效应 /
- 条件概率 /
- 共振散射
Abstract: Based on the neutron self-shielding calculation code SGMOC,which is the combination of subgroup method and characteristics method that developed by ourselves,we studied the two techniques to improve the SGMOC calculation accuracy.The numerical results prove that both techniques have the capability to improve the resonance self-shielding calculation accuracy.The resonance interference effect treatment which uses a new method to obtain the conditional probabilities,has a correction effect about 20~230 pcm.When the impact of the resonance scattering is considered,the correction effect is about 100 pcm.When utilizing the above two techniques simultaneously,the correction effect is about 30~270 pcm.
- Resonance self-shielding /
- SGMOC /
- Resonance interference effect /
- Conditional probability /
- Resonance scattering