严重事故下安全壳气溶胶去除的不确定性和敏感性分析

IF 3.2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2025-09-07 DOI:10.1016/j.pnucene.2025.106004

Pingwen Ou , Yongzheng Chen , Peng Chen , Yong Ouyang , Chao Guo , Guanghui Su

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引用次数: 0

摘要

本研究重点使用严重事故积分代码ASTEC对严重事故条件下的安全壳气溶胶去除进行不确定性和灵敏度分析，并通过CNPRI的实验验证，以及不确定性和灵敏度耦合工具SUNSET进行验证。介绍了一种“分离”方法，该方法区分了热液压和气溶胶边界条件，以突出遏制气溶胶机制的影响。选取11个相关的不确定性输入参数进行不确定性传播，利用Spearman相关系数描述灵敏度。去除因子表现出显著的变化，其峰值是由于堆芯迁移和随后的蒸汽产生引起的扩散电泳沉积的暂时增强。去除系数的不确定性在气溶胶释放终止前是很大的，在释放终止后减小。重力沉降和扩散电泳沉降是最主要的贡献，分别约占气溶胶沉积质量的70%和20%。初始质量、介质直径、重力形状因子和团聚形状因子是影响气溶胶去除的输入参数，包括容器内沉积和环境释放，在核工程源项估计和放射性后果评价中应谨慎、保守地考虑它们。

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Uncertainty and sensitivity analysis of containment aerosol removal under severe accident

This study focuses on the uncertainty and sensitivity analysis of containment aerosol removal under severe accident conditions using the severe accident integral code ASTEC, validated by experiments carried by CNPRI, and the coupled uncertainty and sensitivity tool SUNSET. A "separated" methodology is introduced, which distinguishes between thermal-hydraulic and aerosol boundary conditions to highlight the impact of containment aerosol mechanisms. Eleven uncertainty input parameters related are selected for uncertainty propagation and the Spearman correlation coefficient is utilized to describe sensitivity. The removal factor exhibits significant variation, with peaks due to temporary enhancement of diffusiophoresis deposition caused by corium relocation and subsequent steam generation. Uncertainty in the removal factor is substantial before aerosol release termination and narrows afterward. The gravitational settling and the diffusiophoresis deposition are the most important contributors with approximately 70 % and 20 % deposited aerosol mass, respectively. The initial mass medium diameter, the gravitational shape factor and the agglomeration shape factor are the most influential input parameters in aerosol removal, including in-containment deposition and environmental release, and they should be considered discreetly with conservatism in source term estimation and radioactive consequence evaluation in nuclear engineering.

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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.