基于下一事件估计的定向屏蔽问题关联计算方法

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2024-10-08 DOI:10.1016/j.pnucene.2024.105465

Huayang Zhang , Bin Zhong , Ruoyang Qi , Longfei Xu , Huayun Shen , Jinhong Li

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引用次数: 0

摘要

蒙特卡罗模拟已广泛应用于各种核工程研究。然而，在蒙特卡罗研究中处理定向屏蔽问题具有挑战性。这些问题涉及低概率的深穿透和小角度统计，需要消耗大量的计算资源。本文提出了一种基于下一事件估计（NEE）的关联计算方法来解决此类问题。传统的 NEE 在近距离时会产生无限的估计值。我们开发了一种用于估计表面电流的有限方差 NEE，它允许在材料范围内设置链接表面。我们设计了自动权重窗口，通过控制链接面上的粒子数量并约束其权重，进一步优化链接计算方法。新方法可显著提高计算效率。对于空间核反应堆屏蔽模型，计算效率提高了 26 倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Linked calculation method based on next event estimation for directional shielding problems

Monte Carlo simulations have been widely used in various nuclear engineering studies. However, it is challenging to handle directional shielding problems in Monte Carlo research. These problems involve deep-penetration and small-angle tallies with low probabilities, which consume a large number of computational resources. In this paper, a linked calculation method based on the next event estimation (NEE) is proposed for addressing such problems. The conventional NEE will produce infinite estimates at close distance. We develop a finite-variance NEE for estimating surface current, which allows the linked surface to be set within the materials. The automatic weight window is designed to further optimize the linked calculation method by controlling the number of the particles on the linked surface and constraining their weights. The new method can significantly improve computational efficiency. For a space nuclear reactor shielding model, the computational efficiency is improved by a factor of 26.

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.