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首页> 外文期刊>International journal of quality, statistics, & reliability >Risk-Based Allowed Outage Time and Surveillance Test Interval Extensions for Angra 1
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Risk-Based Allowed Outage Time and Surveillance Test Interval Extensions for Angra 1

机译：基于风险的Angra 1停机时间和监视测试间隔扩展

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摘要

In this work, Probabilistic Safety Assessment (PSA) is used to evaluate Allowed Outage Times (AOT) and Surveillance Test Intervals (STI) extensions for three Angra 1 nuclear power plant safety systems. The interest in such an analysis lies on the fact that PSA comprises a risk-based tool for safety evaluation and has been increasingly applied to support both the regulatory and the operational decision-making processes. Regarding Angra 1, among other applications, PSA is meant to be an additional method that can be used by the utility to justify Technical Specification relaxation to the Brazilian regulatory body. The risk measure used in this work is the Core Damage Frequency, obtained from the Angra 1 Level 1 PSA study. AOT and STI extensions are evaluated for the Safety Injection, Service Water and Auxiliary Feedwater Systems using the SAPHIRE code. In order to compensate for the risk increase caused by the extensions, compensatory measures as (1) test of redundant train prior to entering maintenance and (2) staggered test strategy are proposed. Results have shown that the proposed AOT extensions are acceptable for two of the systems with the implementation of compensatory measures whereas STI extensions are acceptable for all three systems.
机译：在这项工作中，概率安全评估（PSA）用于评估三个Angra 1核电厂安全系统的允许中断时间（AOT）和监视测试间隔（STI）扩展。对这种分析的兴趣在于，PSA包括用于安全评估的基于风险的工具，并且已经越来越多地用于支持监管和运营决策过程。关于Angra 1，在其他应用中，PSA意味着该实用程序可以使用另一种方法来证明巴西监管机构放宽了技术规范。这项工作中使用的风险度量是从Angra 1 Level 1 PSA研究获得的核心损坏频率。使用SAPHIRE代码对安全注入，自来水和辅助给水系统的AOT和STI扩展进行了评估。为了补偿因扩建而引起的风险增加，提出了以下补偿措施：（1）进入维修之前的冗余列车测试和（2）交错测试策略。结果表明，建议的AOT扩展对于采用补偿措施的两个系统都是可以接受的，而STI扩展对于所有三个系统都是可以接受的。

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