电网频率变化对压水堆机组运行的影响分析及应对措施

Analysis and Countermeasures for Effects of Grid Frequency Change on PWR Unit Operation

在世界核营运者协会(WANO)分析过的多起事件中,操纵员完全依赖反应堆保护系统来保护堆芯,而不是优先采取保守行动。尤其是在发生规程未覆盖的电网异常工况时,由于操纵员缺乏经验可能使工况进一步恶化。分析电网频率变化对压水堆机组运行的潜在不利影响,提出应对措施,使操纵员在遇到此类电网异常工况时能及时作出正确的响应,避免反应堆保护系统动作来保护堆芯,以保守地监控压水堆机组运行,始终保持电厂的安全限值有足够的安全裕度。

In many analyzed events by WANO, operators relied solely on the reactor protection system to protect the reactor core without taking pre-emptive conservative actions. Especially during this off-normal grid conditions which was beyond the procedure guidance, these conditions may be further exacerbated by a reactor operator＇s inexperience. In this paper, the potential adverse effects of the grid frequency change on PWR units operation is analyzed, the appropriate contingency plans are proposed so that the reactor operators can respond correctly in time when this off-normal grid condition occurs, to avoid causing reactor scrams to protect the reactor core, and the operators can conservatively monitor the PWR units operation, and a prudent margin to the plant safety limitations is always maintained.