秦山核电厂二回路系统水化学的改进

Improvement of Secondary Water Chemistry in Qinshan Nuclear Power Plant

核电厂二回路系统的水质控制与关键重要设备蒸汽发生器的运行寿命有着密切的关系,秦山核电厂运行16年来,随着秦山核电厂二回路系统水化学管理的不断改进,二回路系统的水质不断改善。这些管理改进主要体现在管理理念的改变,二回路系统高AVT(全会法处理方式)处理、对凝结水精处理装置的优化运行以及大修及启动过程的严格控制等。通过这些改进措施的实施,电厂的WANO(世界核营运者协会)化学性能指标从1997年的1.66下降到2006年的1.00,达到了世界先进水平。二回路水化学的改善确保了蒸汽发生器传热管的结构完整性。

The water quality control in PWR secondary system has close relationship with the service life of key important components, such as SG. With the improvement of water chemistry management of secondary system in Qinshan nuclear power plant （ QNPP ）, the water quality of secondary system becomes better and better. These improvements include renewal of management concept, adoption of high AVT of secondary system, optimized operation of condensate polisher and strictly chemical control during outage and startup period. With the implementation of these measurements, the WANO chemistry performance index improved from 1.66 in 1997 to 1.00 in 2006, reaching the advanced level of the world. The improvement of secondary water chemistry ensures the integrity of SG tubes in QNPP.