of nuclear power station based on fault tree

 

 

LI Li, GUO Meng, HAN Chui huang, WANG Ai bin, JIA Si lin

 

(China Nuclear Power Engineering Co., Ltd., Shenzhen 518124, China)

 

 

Abstract: Aiming at the circulating water pump motor′s guide bearing bush burning incident of Yangjiang Nuclear Power Station Unit 2, study on the cause of the incident was carried out from the perspective of equipment manufacturing quality, installation accuracy, working condition and personal operation. Based on fault tree analysis method, a fault tree of the incident was drawn and a series of basic events could be established and analyzed. By calculating the structure important degree from a qualitative perspective, the major events leading to the incident were found out. Combining with the investigation result, the cause of the incident was clear: no effective detection or monitoring was done to the bad working condition. Afterwards, this analysis was used as a guide for subsequent solution, and the major events were handled emphatically. At last, the incident was successfully resolved. On the other hand, there was some experience for the prevention of incident like this. The results of analysis and resolving indicate that fault tree is appropriate for this kind of incidents because of its correct analysis and emphatic measures.

 

Key words: circulating water pump; motor; bushburning; fault tree