核电厂主泵轴封水系统微生态研究

Effect of Microbiology Ecology in Main Seal Water System of Power Plants

核电厂的主泵轴封水系统会出现由微生物腐蚀导致的材料腐蚀、管道堵塞现象。为了系统地研究主泵轴封水系统的微生态,对多点的水样进行了微生物检测。微生物培养的结果显示来自水源点的菌落总数最高。利用最大或然数(MPN)法测量结果表明系统中主要的微生物类型为铁细菌,包括不动杆菌、假单胞菌、罗尔斯通氏菌等,及一些难培养的细菌。研究结果证实主泵轴封水系统的堵塞是多种菌共同作用的结果,要降低微生物腐蚀的副作用,必须破坏这类微生物的共生效应,定期的监控和消杀可以降低堵塞的风险。

Microbiology influenced corrosion (MIC) happens in the main pump seal water system in nuclear power plants. For systematical study of the microbiology ecology in this system, many numbers of water samples were selected and their microbiology composition was tested. Results of microbial culture indicate that the total number of colonies from the source of water is the highest. MPN method test result indicates that the iron bacteria is the main type in this system, including Ralstonia, Acinetobacter, Pseudomonas and other bacteria that hard to cultured. Study reveals that the blocking phenomenon in the main pump seal water system is caused by many types of bacteria, and to reduce the effects of MIC, microbiology ecology must be destroyed. Regular monitoring and disinfection could decrease the risk of blocking. © 2016, Editorial Board of Journal of Nuclear Power Engineering. All right reserved.