SGTR事故并发碘尖峰研究

Study on Accident-initiated Iodine Spiking during an SGTR

SGTR事故是安全评审重点关注的设计基准事故之一，在三门核电一期工程安全评审中．SGTR事故放射性后果分析被列为CP条件，引起了广泛关注。SGTR事故并发碘尖峰释放机理较为复杂并且对最终剂量结果影响很大。本文结合实际电厂运行经验数据，提出了一种新的SGTR事故并发碘尖峰分析方法，然后对新方法的合理性和保守性进行了分析，最后，将现有方法和新方法运用到实际电厂进行案例分析．结果表明，新方法得到的剂量结果可以满足我国国标的剂量验收准则。

SGTR accident is one of the design basis accidents which were focused on during safety review. SGTR accident radiological consequences analysis became the Sanmen Units 1 ＆ 2 Construction Permit （CP） Condition, which was widely paid attention to. Accident-initiated iodine spiking during an SGTR with complex mechanism gives a big influence on the final dose result. This paper presents a new method based on the data collected from PWR plants, and analyzes its rationality and conservation. In the end the practical case based on the current and new methods indicate that the SGTR accident doses based on the new method can satisfy the acceptable criteria of GB.