Retention analysis of aerosol inside narrow channels of the containment

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2024-10-22 DOI:10.1016/j.anucene.2024.110987

Zhang Dandi , Wang Shanpu , Tong Lili , Cao Xuewu

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Abstract

Aerosol retention inside narrow channels is the optimization direction of the leakage source term assessment for nuclear power plant containment. Based on the flow characteristics of carrier gas and the deposition characteristics of transported aerosol, a one-dimensional analysis method of aerosol retention in narrow channels is developed through considering different deposition mechanisms of inlet loss, gravity settlement, Brownian diffusion, turbulent deposition and steam condensation. The flow models of carrier gas and the retention models of aerosol are analyzed and verified, respectively. The flow of carrier gas deviates from laminar flow earlier through using the drag model of narrow channels. The prediction accuracy of aerosol penetration factor calculated by current analysis method in narrow channels is improved under laminar flow and turbulent flow through comparing with the previous calculation methods. Aerosol retention analysis is conducted on the narrow channels of steel containment under the typical severe accident. The turbulent deposition introduced by larger leakage channels increases the aerosols retention effect in narrow channels.

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安全壳狭窄通道内的气溶胶滞留分析

窄通道内气溶胶滞留是核电站安全壳泄漏源项评估的优化方向。根据载气的流动特性和气溶胶的沉降特性，考虑入口损失、重力沉降、布朗扩散、湍流沉降和蒸汽凝结等不同沉降机理，建立了窄通道内气溶胶滞留的一维分析方法。分别对载气的流动模型和气溶胶的滞留模型进行了分析和验证。通过使用窄通道的阻力模型，载气的流动偏离了早期的层流。与之前的计算方法相比，目前的分析方法计算出的气溶胶在窄通道中的穿透系数在层流和紊流情况下的预测精度都有所提高。对典型严重事故下的钢制安全壳窄通道进行了气溶胶滞留分析。较大泄漏通道引入的湍流沉积增加了气溶胶在窄通道中的滞留效果。

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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来源期刊

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.