某压水堆核电站控制棒驱动机构电流负载特性浅析

Analysis of CRDM Current Load Characteristics of Pressurized Water Reactor Nuclear Power Plant

随着某压水堆核电站棒控棒位系统(RGL)的逐步老化及备件停产,拟采用成熟的数字化技术进行整体改进。由于主流数字化技术的控制电源功耗增大,有必要对现有系统的负载和容量进行分析论证。通过控制棒驱动机构(CRDM)和控制系统在极限负载工况下对控制棒驱动机构电源(RAM)系统的负载特性及功耗进行简化分析和仿真。仿真结果表明,随着新系统控制电容量的增大,原系统供电方案不利于RAM系统的稳定运行,存在潜在风险。为确保RGL系统整体改进后系统供电容量及品质满足RGL的正常稳定运行需求,提出可行的电源系统改进方案,将原有RGL的RAM两相控制电转移至交流不间断电源系统(LNE)。该方案在有效降低RAM发电机组三相不平衡现象的同时,有利于RAM发电机组的稳定运行,确保改进后RGL控制电源系统的可靠性。

With the gradual aging of a pressurized water reactor nuclear power plant rod position indication and rod control system(RGL) and the discontinuation of spare parts, it is proposed to adopt the mature digital technology for overall improvement. Due to the increased power consumption of the control power supply of the mainstream digital technology, it is necessary to analyze and demonstrate the load and capacity of the existing system. A simplified analysis and simulation of the load characteristics and power consumption of the control rod drive mechanism power(RAM) system by the control rod drive mechanism(CRDM) and the control system under extreme load conditions is performed. The simulation results show that with the increase of control power capacity of the new system, the original system power supply scheme is not conducive to the stable operation of the RAM system and there are potential risks. In order to ensure that the system power supply capacity and quality meet the normal and stable operation requirements of the RGL system after the overall improvement of the RGL system, a feasible power supply system improvement plan is proposed to transfer the two-phase control electricity of the original RGL RAM to the AC uninterruptible power supply system(LNE).The sheme can effectively reduce the three-phase unbalance phenomenon of the RAM generator set while facilitating the stable operation of the RAM generator set and ensuring the reliability of the improved RGL control power system.