碎石过滤器阴极保护系统异常原因

Abnormal Reasons of Cathodic Protection System of a Debris Filter

国内某电站机组首轮大修期间发现一个有牺牲阳极阴极保护的碎石过滤器表面大面积出现锈蚀。对阴极保护系统进行检查,发现导致这一问题的原因是阳极与碎石过滤器、筒体与碎石过滤器之间都没有很好地连接,导致阴极保护系统失效。提出了安装固定连接导电片、系统检修后重新测量点连接性改进措施。

Corrosion was found on the out surface of a debris filter which was protected by an sacrificial anode cathodie proteetion system in a nuclear power plant in China. After eheeking the whole system, it is found that the poor connections between the anode and the filter as well as the cylinder and the fiher were the main reasons causing the failure of eathodie protection. Improvemcnt measures, sueh as adding extra conductive pieces and measuring the conduetivity after system overhaul were proposed.