假想堆芯熔化严重事故下反应堆压力容器完整性的研究进展与建议

Research progress and recommendations on reactor pressure vessel integrity under hypothetical core melt down accident

堆芯熔化严重事故下保证反应堆压力容器完整性非常重要,高温蠕变失效是堆芯熔化严重事故下反应堆压力容器的主要失效模式。本文介绍了近年来在假想堆芯熔化严重事故下国内外反应堆压力容器高温蠕变行为的研究进展及现状,着重阐述了在材料高温蠕变试验、缩比模型试验和数值模拟等方面取得的成果,以及国内在RPV结构完整性高温蠕变行为研究方面的最新成果,指出了目前研究中存在的问题并提出开展多轴拉伸试验、三维耦合效应的温度场分析和缩比模型试验等研究方向。

Background： It is very important to ensure the integrity of the reactor pressure vessel under core melt down accident. The high-temperature creep failure is the main failure mode of the reactor pressure vessel under core melt down accident. Purpose： This paper is to present an overview of research status and progress on high-temperature creep behavior of reactor pressure vessel considering the hypothetical core melt down scenario. Methods： Emphasis is placed on accomplished achievements in creep tests, scale model experiments and numerical simulation, and the domestic newly research productions on high-temperature creep behavior of reactor pressure vessel structure integrity. Conclusions： This paper also discusses the limitations of existing researches and indicates future research directions, such as multi-axis tensile tests, analysis of three-dimensional coupling temperature field, scaled model tests, and so on.