核电厂压水堆超温保护定值ΔT干扰探析

Analysis of Interference on Over-temperature Protection Value ΔT in Nuclear Power Plant

核电厂压水堆超温保护定值ΔT主要功能为防止发生偏离泡核沸腾,实现燃料包壳保护。本文描述核电厂ΔT定值信号波动大的故障,并通过对超温保护定值各个因变量的敏感度分析和仿真,对干扰源和被干扰对象进行定位。同时对波动现象及其原因采用排除分析法,确定电缆布局的设计缺陷为故障原因。之后给出了解决方案,并通过现场工程实施进行了验证,证明本方法的有效性和可行性。

In nuclear power plant, the over-temperature protection value AT prevents nucleate from boiling and protects the fuel cladding. This paper focused on the fluctuation of AT, which is one of the common-mode failures. After sensitivity analysis and simulations of explanatory variables on over-temperature protection value, the sources and objects of the interference are located. And according to investigations on the fluctuation phenomena, the cable layout design defects are confirmed as the causes. The solutions were thus given and successfully verified by on-site implementation.