Experimental Research for CHF Sensitivity of Heat Flux Distribution under IVR Conditions

IF 1 4区工程技术 Q3 NUCLEAR SCIENCE & TECHNOLOGY

Science and Technology of Nuclear Installations Pub Date : 2022-03-16 DOI:10.1155/2022/3522470

Shilei Han, Pengfei Liu, B. Kuang, Yanhua Yang

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引用次数: 2

Abstract

In-vessel retention (IVR) through external reactor vessel cooling (ERVC) is one of the most effective severe accident mitigation measures in the nuclear power plants. The most influential issues on the IVR strategy are in-vessel core melt evolution, the heat fluxes imposed on the lower head, and the external cooling of reactor pressurized vessel (RPV). In the molten pool research, there are mainly two different molten pool configurations: two layers and three layers. Based on the different distributions of heat flux in molten pool configurations, a new problem was raised: whether the in-vessel heat flux distribution will affect the CHF on the outer wall of RPV and further affect the effectiveness of IVR measures? A full-height external reactor vessel cooling and natural circulating facility was conducted to study the CHF sensitivity of different heat flux distributions. The experimental results show that the characteristics of natural circulation are similar and the CHF of the RPV lower head external surface is not obviously affected under the different heat flux distributions. The varying heat flux distribution during severe accident process will not threaten significantly the success of IVR strategy.

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IVR条件下热流分布对CHF敏感性的实验研究

通过反应堆容器外部冷却进行容器内滞留（IVR）是核电站中最有效的严重事故缓解措施之一。IVR策略中最具影响力的问题是容器内堆芯熔体的演变、施加在下封头上的热通量以及反应堆压力容器（RPV）的外部冷却。在熔池研究中，主要有两种不同的熔池结构：两层和三层。基于熔池结构中热通量的不同分布，提出了一个新的问题：容器内热通量的分布是否会影响RPV外壁上的CHF，并进一步影响IVR措施的有效性？采用全高堆外冷却和自然循环装置研究了不同热通量分布对CHF的敏感性。实验结果表明，在不同的热通量分布下，RPV下封头外表面的自然循环特性相似，CHF不受明显影响。严重事故过程中热通量分布的变化不会对IVR策略的成功产生重大威胁。

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

Science and Technology of Nuclear Installations NUCLEAR SCIENCE & TECHNOLOGY-

CiteScore

2.30

自引率

9.10%

发文量

审稿时长

4-8 weeks

期刊介绍： Science and Technology of Nuclear Installations is an international scientific journal that aims to make available knowledge on issues related to the nuclear industry and to promote development in the area of nuclear sciences and technologies. The endeavor associated with the establishment and the growth of the journal is expected to lend support to the renaissance of nuclear technology in the world and especially in those countries where nuclear programs have not yet been developed.