核仪表系统系数设置影响因素分析

核电厂在投入商业运行前，需进行一系列的调试试验确保系统和运行的可靠性。2010年8月，某百万千瓦级核电厂在50％FP甩负荷到厂用电的调试中意外停堆，导致停运两天，拖延了试验的进度。经现场分析发现意外停堆与RPN系数设置不当有关。中国核动力研究设计院快速响应并对事件原因进行了分析，提出了新的RPN系数，顺利完成了50％FP和100％FP甩负荷到厂用电试验。文章首先分析了RPN系数对中子注量率变化率计算的影响，然后分析了影响RPN系数设置的主要因素，给出了RPN系数设置的基本原则，为后续电站的调试试验与运行提供了参考，以避免同类事件再次发生。

The Influence of RPN Coefficient on Normal Operation Transient and Safety Analysis

Before commercial operation of nuclear power plants, a series of pr~operational should be carried out to verify the reliability of the redundant components and auxiliary equipment. In August 2010, fl~ pre-operational tests of certain 1000 MW nuclear power plant, an unexlzeCted reactor trip wzttrred during 50%FP load rejection to houseload condition and the progress of the test was delayed for two days. After site ai~lysis, the reason of the unexpected reactor trip was that the RPN coefficient was inappropriate. The response of Nuclear Power Institute of China was fast and new RPN coefficient was raised, then the load rejection to houseload Condition from 50%FP and 100%FP initial power were sucaflilly Completed. Based on this inddent, the flffluence of the RPN coefficient on nuclear flux rate and reactor safety, and the basic principles to set RPN coefficient are discusad.