1 000MW nuclear power station pumps protect device′s research and applying

HUI Long-wei, ZHAI Ba-jing, MING Qian

（China Nuclear Power Engineering Company, Shenzhen 518124, China）

Abstract: In order to protect pump unit out of cavitation when distributed control system(DCS) couldn′t meet the pressure protection demand of pump unit starting during 1000MW nuclear power station construction, the nuclear power plant DCS system defect was analyzed, and based on the logic control circuit principle, a new type of control system including the pressure detection module, signal delay module, transmission module, power supply module was designed. The operation of the pump unit control was implemented when the pump unit suction pressure abnormal signal was detected by pressure sensor module and transferred to the time delay relay processing, finally into electrical panel. At the same time, the accident button was designed, it could manually stop the operation of pump unit quickly in the accident cases (such as pump bearing at high temperature). Finally, the protection system was tested during nuclear power plant starting and operation. The results indicate that protection system could stop pump unit automatically or manually when suction pressure or other parameters were abnormal, it could protect pump unit system safety and steady running, and also shorten construction time.

Key words: nuclear power station; pump unit; pressure protection