压水堆核电机组停堆氧化过程中溶解氢控制策略优化  

Optimization of Dissolved Hydrogen Control Strategy in PWR Nuclear Power Plant Shutdown Oxidation Process

作　　者：赖宏宇 LAI Hongyu(Fuqing Nuclear Power Co.,Ltd.,Chemistry Department,Fuqing of Fujian Prov.350300,China)

机构地区：[1]福建福清核电有限公司化学处,福建福清350300

出　　处：《核科学与工程》2022年第1期141-150,共10页Nuclear Science and Engineering

摘　　要：在压水堆核电机组功率运行状态下,反应堆冷却剂系统内始终保持氢覆盖,然而机组在进行停堆氧化过程中,因反应堆需开口,为避免氢氧混合爆炸,需要首先除去氢气,将一回路的溶解氢含量降低到规范值以下才能开展氧化运行工作。在压水堆核电机组停堆氧化过程中,一回路溶解氢的有效控制能够决定化学控制过程是否会成为大修下行的关键路径。福清核电目前已经历了15次机组停堆氧化,积累了一些经验和教训。本文结合福清核电已商运的1~4号M310机组历次停堆氧化过程一回路溶解氢控制的实践,从反应堆冷却剂系统溶解氢化学控制的要求及基本原理出发,对停堆氧化过程中可能出现的溶解氢相关问题进行总结研究,提出溶解氢化学控制优化改进策略,以指导机组应对,最终达到提高核安全水平、缩短大修工期、提高换料大修经济效益等目的。Under the power operating state of the PWR nuclear power unit,hydrogen cover is always being maintained in the reactor coolant system.However,during the shutdown oxidation of the unit,the reactor needs to be opened.In order to avoid the explosion of hydrogen and oxygen mixture,it is necessary to remove the hydrogen first and reduce the dissolved hydrogen content of the primary circuit below the specification value to carry out the oxidation operation.In the process of PWR nuclear power plant shutdown oxidation,the effective control of dissolved hydrogen in the primary circuit can determine whether or not the chemical control process will become the key path for outage.This article combines the practice of controlling the dissolved hydrogen in the primary circuit oxidation process of the No.1-4 M310 units that have been commercialized by Fuqing Nuclear Power.Starting from the requirements and basic principles of the dissolved hydrogen chemical control of the reactor coolant system,the possibility of the shutdown oxidation process summarize and study the emergence of dissolved hydrogen related issues,and propose optimized and improved strategies for dissolved hydrogen chemical control to guide the unit to respond,and ultimately achieve the goals of improving nuclear safety,shortening the overhaul period,and increasing the economic benefits of refueling overhaul.

关 键 词：压水堆 停堆氧化 溶解氢 

分 类 号：TL48[核科学技术—核技术及应用]