压水堆DAS仪控设计思路探讨

Discussion on Instrumentation ＆amp; Control Design Features of DAS in PWR

本文从总体设计要求、多样性信号传输路径、多样性实现技术、DAS防误动、DAS与保护系统接口以及在保护系统未发生软件共因失效时防止DAS动作等方面对DAS仪控设计思路进行分析。通过分析得到2种信号传输路径的特点以及3种实现技术的优缺点，建议DAS机柜内部至少采用2／2冗余通道逻辑设置，同时推荐采用工艺状态反馈信号闭锁DAS动作逻辑结合整定值和响应时间调整的方式来防止在保护系统未发生软件共因失效时DAS动作。

The instrumentation ＆amp; control design features of DAS （diversity actuation system ） , including general design requirement , diversity signal transmission route , diversity processing technology ,prevention of DAS spurious actuation and prevention of DAS actuation under the condition of RPS without SWCCF （software common cause failure） were analyzed in this paper .As a result of the analysis ,features between two diversity signal transmission routes were presented and advantages and disadvantages of the bellow three diversity technology were discussed .The 2/2 internal logic arrangement of DAS cabinet was recommended .The regulation of set point values and response time combined with blocking DAS actuation from device status feedback signal is taken as a reference for prevention DAS actuation w hen RPS SWCCF is not appeared .