阳江核电站R棒频繁动作问题分析

Analysis of R Bank Frequent Action Problem in Yangjiang Nuclear Power Plant

阳江核电站1、2、3号机组,在第2、第3核燃料循环期间,一回路温度控制棒(R棒)每天频繁动作,严重影响机组安全运行。从R棒的逻辑控制原理、堆芯装载等方面进行分析,将一阶惯性、超前滞后、微分环节的传递函数,转换为差分方程进行理论计算,并在模拟机上进行了87%FP(满功率)平台一回路温度±4℃扰动试验,试验结果表明修改的参数正确,可以解决R棒频繁动作问题。阳江核电站2号机组实施修改参数后,R棒动作正常,机组稳定运行期间,R棒动作2次/日。

In the 2 nd and 3 rd nuclear fuel cycles of Unit 1,Unit 2 and Unit 3 in Yangjiang Nuclear Power Plant,, R bank acts frequently, seriously affecting the safety with operation of the unit. In this paper, the logic control principle of R bank and the loading of core are analyzed, and the transfer function of first-order inertia, lead lag and differential link is converted into difference equation. The theoretical calculation is carried out before the parameter is modified, and the temperature ±4 ℃disturbance simulation test upon 87%FP power platform is carried out on the plant simulator. The test results show that the modified parameters are correct and can solve the frequent action problem of R bank. After the modification of the parameters for Unit 2, the R bank acts normally, and R bank action frequency is about 1 time per 2 days.