MCNP程序分段-衔接计算方法研究

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Research on MCNP Bootstrapping Calculation Method

Reactor Engineering Department, China Nuclear Power Engineering Co., Ltd. Beijing, 100840, China

摘要: 蒙特卡罗方法在处理大系统或小概率事件的问题时,计算结果偏低甚至根本得不到结果,这时就要考虑将大模型分成几部分,即用分段-衔接的办法,经过多次计算完成对整个系统的模拟。本文讨论了分段-衔接的具体方法,简单介绍了面源记录、边界条件的选择等方面的初步研究成果。结果表明,使用程序自带的SSW/SSR卡读/写面源,并用反射/真空外边界条件进行分段-衔接计算,能得到与直接计算非常接近的结果。
- 分段-衔接计算 /
- 边界条件 /
- 面源记录 /
- SSW/SSR
Abstract: Monte Carlo method lacks accuracy,or even fails to get a result when dealing with compli-cated models or cases with very low possibility.At this time we may consider dividing the model into several parts（bootstrapping） and calculate the problem in separate steps.In this paper,the application of bootstrap-ping is discussed,including recording surface source,selecting boundary geometry.A few bootstrapping ex-amples show that the best estimated results can be obtained using SSW/SSR card and reflective/vacant boundary.
- Bootstrapping calculation /
- Boundary geometry /
- Recording surface source /
- SSW/SSR