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| Entered date | Event description | |
|---|---|---|
| ENS 49697 | 6 January 2014 19:09:00 | At 1659 EST hours on January 6, 2014, Beaver Valley Power Station Unit 1 automatically tripped from 100% power. The cause of the reactor trip was a main transformer differential trip. All rods fully inserted into the core and the plant is stable in Mode 3. All three auxiliary feedwater pumps automatically started as expected. Normal and Emergency Busses are being powered by Offsite Power. The cause of the main transformer differential trip is being investigated. All other equipment functioned as expected. At 1757 EST hours the Emergency Operating Procedures were exited. Resident inspector has been notified. Decay heat is being removed via the turbine bypass valves to the condenser. No primary or secondary safety valves lifted. Unit 2 was unaffected. Licensee notified the States of Pennsylvania, Ohio, and West Virginia and the Counties of Beaver, PA, Hancock, OH, and Columbiana, OH. |
| ENS 46304 | 2 October 2010 15:38:00 | Approximately five hours after Beaver Valley Power Station Unit No. 1 was shutdown at 0011 hours (EDT) to enter a scheduled refueling outage, an approximate 5 drops per minute leak was identified from a drain valve on the Residual Heat Removal (RHR) System inside containment. This leak is downstream of the two series RHR isolation valves on a pipe which connects to both trains of RHR. The actual location of the leak on the valve was not immediately evident. An evaluation was requested. At 1011 hours, the evaluation reported a 270 degree circumferential crack in the socket weld on the RHR side of the valve. Without reasonable assurance of RHR System operability, both trains of RHR were declared inoperable. Both trains of the RHR System are currently in service, along with three steam generators/condenser remaining available for decay heat removal. Actions to address this condition are being pursued. This is being reported as a condition that at the time of discovery could have prevented the fulfillment of the safety function of systems needed to remove decay heat pursuant to 10 CFR 50.72(b)(3)(v)(B) since both trains of RHR were declared inoperable. Beaver Valley Power Station Unit No. 2 is unaffected by this event and remains at 100 percent power. The NRC Resident Inspector has been notified. T.S. Action 3.4.7 requires that efforts be immediately initiated to restore RHR as soon as possible. |
| ENS 45023 | 26 April 2009 21:31:00 | At 1545 on 04/26/2009, the Emergency Response Data System (ERDS) at the Beaver Valley Power Station (BVPS) Unit 1 was removed from service. The ERDS is a direct near real-time electronic data link between the licensee's onsite computer system and the NRC Operations Center that provides for the automated transmission of a limited data set of selected parameters. The ERDS supplements the existing voice transmission over the Emergency Notification System (ENS) by providing the NRC Operations Center with timely and accurate updates of a limited set of parameters from the licensee's installed onsite computer system in the event of an emergency. The BVPS Unit 1 plant computer and ERDS was removed from service due to planned maintenance on the River Water cooling to the air conditioning for the computer room. The maintenance is scheduled to be completed in approximately 48 hours. This is being reported pursuant to 10 CFR 50.72(b)(3)(xiii). Until the ERDS communication is restored, BVPS Unit 1 would utilize its pre-planned backup information flow path in event of an emergency as provided in Procedure 1/2-EPP-IP-1.4, Attachment G when the ERDS system is not operational. The BVPS Unit 2 ERDS is not affected and remains operational. The NRC Resident has been notified.
As of 1320 on 04/29/2009, the BVPS Unit 1 plant computer and the data communication link to the Emergency Response Data System (ERDS) were returned to service. The site NRC Resident Inspector has been notified. Notified R1DO (Krohn). |