安全壳内置换料水箱子系统设计改进的PSA评价

根据一级概率安全分析（Probabilistic Safety Analysis, PSA）的结果，安全壳内置换料水箱（In-containment Refueling Water Storage Tank, IRWST）子系统的初始设计导致安注管线破裂（Safety Injection Line Break, SI-LB）始发事件对堆芯损坏频率（Core Damage Frequency, CDF）有较大的贡献。本文提出了 IRWST 子系统的设计改进方案，将 IRWST 水箱内的滤网由两个（A/B）增加为三个（A/B/C），并通过管线实现滤网之间的相互连接。通过重新构建故障树对改进后的 I...

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Bibliographic Details
Published in核技术 Vol. 38; no. 9; pp. 89 - 94
Main Author 刘晶晶 王成章 徐志新
Format Journal Article
LanguageChinese
Published 2015
Subjects
堆芯损坏频率
安全壳内置换料水箱子系统
概率安全分析
Online AccessGet full text
ISSN0253-3219

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Summary:根据一级概率安全分析（Probabilistic Safety Analysis, PSA）的结果，安全壳内置换料水箱（In-containment Refueling Water Storage Tank, IRWST）子系统的初始设计导致安注管线破裂（Safety Injection Line Break, SI-LB）始发事件对堆芯损坏频率（Core Damage Frequency, CDF）有较大的贡献。本文提出了 IRWST 子系统的设计改进方案，将 IRWST 水箱内的滤网由两个（A/B）增加为三个（A/B/C），并通过管线实现滤网之间的相互连接。通过重新构建故障树对改进后的 IRWST 子系统进行建模分析，并对相应的事件树以及一级 PSA 模型进行详细的定量化计算。结果表明，IRWST 子系统这一改进能够显著降低堆芯损坏风险。IRWST 子系统的改进将 SI-LB始发事件的 CDF 降低了53.5%，将整个一级 PSA 的 CDF 降低了21.5%。
Bibliography:PSA, IRWST sub-system, CDF
31-1342/TL
LIU Jingjing, WANG Chengzhang, XU Zhixin （China Nuclear Power Design Company, Shanghai Branch, Shanghai 200241, China）
Background： Probabilistic safety analysis （PSA） methodology is widely used to assess the risk of nuclear power plant （NPP）. Based on the results of level 1 PSA, the vulnerability of In-containment Refueling Water Storage Tank （IRWST） sub-system makes the initiating event Safety Injection Line Break （SI-LB） contributing significantly to core damage frequency （CDF）. Purpose： This study aims to find the vulnerability of IRWST design by PSA assessment, and provide design improvement suggestion to reduce the risk of NPP. Methods： PSA methodology is used to evaluate the design improvement of IRWST, which is implemented by adding a third strainer （strainer C）, and the three strainers are connected to each other. Fault trees of IRWST are rebuilt, and related event trees and level 1 PSA model are recalculated. Results： Quantitative result shows that the contribution
ISSN:0253-3219