核电厂内部水淹确定论安全评价方法及应用

为确保核电厂在内部水淹情况下仍能保证安全功能，有必要在核电厂设计时考虑对内部水淹进行防护，并对核电厂进行内部水淹安全评价以验证内部水淹防护目标的实现。通过对内部水淹防护目的、要求以及内部水淹防护措施进行研究，探索和提出内部水淹确定论安全评价的设计假设、方法和步骤。以某百万kW级核电厂硼酸输送泵间、反应堆和乏燃料水池冷却和处理系统泵间为例对方法进行了应用和验证，分析表明无需对硼酸输送泵间进行特殊防护，但须对反应堆和乏燃料水池冷却和处理系统泵间采取适当的疏水措施以确保核安全功能的实现。

Method and Application for Internal Flooding Deterministic Safety Assessment of Nuclear Power Plant

In order to ensure the safety functions of nuclear power plants in case of internal flooding, it is necessary to consider protection against internal flooding in nuclear power plant design and evaluate the consequence to verify that the target of internal flooding protection can be achieved. According to the study on internal flooding protection purposes, requirements and protection measures, assumptions, methods and steps of internal flooding deterministic safety assessment were sought and presented. Based on a boric acid transportation room and reactor cavity and spent fuel pool cooling and treatment (PTR) pump room of 1 000 MWe nuclear power plant, the method was applied and verified. The analysis result shows that the boric acid transportation room doesn’t need any protections, but the PTR pump room needs to take drain measures in order to perform the nuclear safety functions.