蒙特卡罗模拟中分散燃料的弦长取样校正分析

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Science and Techniques Pub Date : 2024-05-09 DOI:10.1007/s41365-024-01432-2
Zhao-Yu Liang, Ding She, Yu-Tong Wen, Lei Shi
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引用次数: 0

摘要

分散燃料以其出色的安全性能而著称,被广泛应用于高温气冷堆等先进反应堆中。与确定性方法相比,蒙特卡洛方法在随机介质的几何建模方面更具优势。显式建模方法计算精度高,计算成本高。弦长采样(CLS)方法可以利用矩阵弦长的概率密度函数对中子传输过程中的弦长进行采样,从而提高计算效率。本研究表明,现实随机介质中的排除体积效应会给 CLS 带来一定的偏差。研究提出了一种弦长修正方法,通过开发基于等效传输概率的粒子代码来获得弦长修正系数。通过与 RMC 代码中显式建模的参考解进行数值分析,证明了采用所提修正方法的 CLS 在解决现实无限随机介质中的排除体积效应方面具有良好的准确性。
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Chord length sampling correction analysis for dispersion fuel in Monte Carlo simulation

Dispersion fuels, knowned for their excellent safety performance, are widely used in advanced reactors, such as high-temperature gas-cooled reactors. Compared with deterministic methods, the Monte Carlo method has more advantages in the geometric modeling of stochastic media. The explicit modeling method has high computational accuracy and high computational cost. The chord length sampling (CLS) method can improve computational efficiency by sampling the chord length during neutron transport using the matrix chord length's probability density function. This study shows that the excluded-volume effect in realistic stochastic media can introduce certain deviations into the CLS. A chord length correction approach is proposed to obtain the chord length correction factor by developing the Particle code based on equivalent transmission probability. Through numerical analysis against reference solutions from explicit modeling in the RMC code, it was demonstrated that CLS with the proposed correction method provides good accuracy for addressing the excluded-volume effect in realistic infinite stochastic media.

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来源期刊
Nuclear Science and Techniques
Nuclear Science and Techniques 物理-核科学技术
CiteScore
5.10
自引率
39.30%
发文量
141
审稿时长
5 months
期刊介绍: Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.
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