The structured review of operating experience provides useful insights for improved operation and regulation. This paper presents insights and the related statistical analysis from the topical study of flooding-related international operating experience during the last 20 years. The study is the result of the European Clearinghouse activity and covers four databases: French, German, US Licensee Events Reports and the IAEA/NEA International Reporting System (IRS).

The methodology applied includes both a qualitative and a quantitative assessment: screening, review and statistical analysis. All relevant events (263) are characterised, and a selection of these (109) are further analysed to derive insights. The paper presents 16 generic insights synthesised from 94 specific insights. The insights are grouped based on the systems causing the events and on the purpose for corrective actions.

The statistical analysis shows the contribution, the trend and the correlation between the events databases and the insights. The US and IRS events contribute the most to insights, with important contributions from two other databases. A slightly increasing linear trend of the yearly number of events is missing only for the German events. The correlation analysis for the number of events contributing to the insights shows a noticeable correlation between the US and IRS databases’ and the BWR and PWR reactor type events.

The analysis of the relative contribution of the events to the insights shows a statistically significantly smaller or larger contribution to several insights from different databases and reactor types. This could be the basis for a decision about the relevance and the applicability of some insights in certain countries and to specific reactor types.

The fact that the most important events contributing to the insights are well distributed over the entire 20 years period shows their continuous relevance. Equally, the fact that all four databases and reactor types contribute sufficiently to the most relevant events shows that the insights are similarly relevant for all of them. The insights from this analysis seem internationally relevant recommendations and they could help the licensees and regulatory authorities to prevent flooding events from occurring, to protect safety systems from flood and to improve flooding protection and mitigation.

对运营经验的结构化审查为改进运营和监管提供了有用的见解。本文介绍了对过去 20 年与洪水相关的国际运营经验的专题研究的见解和相关统计分析。该研究是欧洲信息交换所活动的结果，涵盖四个数据库：法国、德国、美国被许可方事件报告和 IAEA/NEA 国际报告系统 (IRS)。

应用的方法包括定性和定量评估：筛选、审查和统计分析。对所有相关事件 (263) 进行表征，并进一步分析其中的一部分 (109) 以获得洞察力。本文提出了从 94 个特定见解合成的 16 个通用见解。洞察根据导致事件的系统和纠正措施的目的进行分组。

统计分析显示了事件数据库与洞察力之间的贡献、趋势和相关性。美国和 IRS 事件对洞察力的贡献最大，其他两个数据库也做出了重要贡献。仅德国事件缺少年度事件数量的略微增加的线性趋势。对有助于洞察的事件数量的相关分析表明，美国和 IRS 数据库与 BWR 和 PWR 反应堆类型事件之间存在显着的相关性。

事件对洞察力的相对贡献的分析表明，对来自不同数据库和反应堆类型的几个洞察力的贡献在统计上显着更小或更大。这可能是就某些见解在某些国家和特定反应堆类型的相关性和适用性做出决定的基础。

促成洞察的最重要事件在整个 20 年期间分布良好，这一事实表明它们具有持续的相关性。同样，所有四个数据库和反应堆类型对最相关的事件都有足够的贡献这一事实表明，这些见解对所有事件都具有相似的相关性。该分析的见解似乎具有国际相关性的建议，它们可以帮助许可证持有者和监管机构防止洪水事件的发生，保护安全系统免受洪水影响，并改善洪水保护和缓解措施。