Beaver Valley Both Trains of Head Safety Injection Pumps Declared Inoperable

Event Number: 46208
Notification Date: 08/26/2010


"Beaver Valley Power Station Unit No.1, while operating at 100% full power, performed Ultrasonic Testing on the High-Head Emergency Core Cooling System Pump suction headers (6" and 8") following a fill and vent of the 'A' High Head Emergency Core Cooling System Pump. This is required because the fill point for the out of service Emergency Core Cooling System Pump 1CH-P-1A, is it's suction valve from the 8" Charging header, 1CH-19, which was opened. Preliminary indications were such that the 6" suction header was full of water and an air void did exist in the 8" suction header, but the size was indeterminate and had to be calculated by System Engineering. Operations commenced additional monitoring for cavitation of the running charging pump with none identified. Operations then vented the 8" suction header multiple times. At 1649 hours today, the results of the Ultrasonic Test (UT) was provided by System Engineering indicating that an air void existed in the Emergency Core Cooling System Pump 8" Suction header that was in excess of the Acceptance Criteria. At 1649 hours, both trains of High Head Safety Injection pumps were declared Inoperable but remain Available. Technical Specification (TS) 3.5.2 - ECCS operating is not met. Required Action C.1 requires entry of TS LCO 3.0.3 immediately.

"Per 10CFR50.72(b)(3)(v)(A)&(D) - Event or Condition That Could Have Prevented Fulfillment of a Safety Function, and 10CFR50.72(b)(3)(ii)(B) Unanalyzed Condition, this event is reportable to the NRC within 8 hours.

"At 1715 additional venting of the 6" Charging Pump suction header revealed no air present. Additional venting of the 8" Charging Pump suction header revealed additional air pockets. The 8" header was then vented multiple times, with a short delay in between each venting, until no air was identified.

"At 1718, follow up UT on both Charging Pump Suction headers revealed it remained full of water with no voids present. Both trains of High Head Safety Injection are declared OPERABLE restoring compliance to TS LCO 3.0.3 and 3.5.2. Reactor power remained at 100% during these evolutions.

"The NRC Resident Inspector was informed."