Analysis and Treatment of Electrical Overspeed Protection Tripping Caused by Overspeed Test of Auxiliary Water Supply Steam Pump
Unit 6 of a certain nuclear power plant is in the normal shutdown mode of the steam generator cooler.The operators carried out the functional test of the steam driven auxiliary feedwater pump 6 ASG003 PO(hereinafter referred to as the steam driven auxiliary feedwater pump)according to the plan.After the main control started the steam driven pump,the generator gas overspeed protection trip alarm signal was triggered.It was verified that the maximum pump speed increased to 9 334 r/min(exceeding the electrical overspeed protection set value of 9 330 r/min),and the steam driven pump tripped,Repeat the experiment to verify that the fault still exists.This article conducts cause analysis through fault tree analysis method and formulates corrective measures to solve the abnormal pump tripping of the steam driven pump.
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