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This report is being made pursuant to 10CF … This report is being made pursuant to 10CFR50.72(b)(3)(ii)(B). At 15:42 on 02/02/05 while reviewing Operation Experience from another Nuclear Site, it was discovered that the design of the AC Auxiliary Power System incorporates a common circuit which could result in a bus lockout preventing the re-energization of both the Division 1 and Division 2 Essential Safety Feature (ESF) buses from either onsite or offsite power sources due to a single failure in the common portion of the circuitry. This common circuit includes various metering circuits such as System Auxiliary Transformer Wattmeters and Ammeters. Also connected to these metering loops are ground fault devices that feed breaker lockout relays. Should a failure occur on these common circuits, all breakers supplying power to these ESF Buses would be opened, locked out, and prevented from reclosure onto the buses.</br>Due to the loss of the ability to accommodate a single failure, one offsite power source and one onsite Diesel Generator have been declared inoperable and Technical Specification 3.8.1 Condition A, Condition B, and Condition E entered. Corrective actions are in progress to isolate the common circuit and eliminate the single point vulnerability.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
21:42:00, 2 February 2005 +
41,366 +
20:59:00, 2 February 2005 +
21:42:00, 2 February 2005 +
This report is being made pursuant to 10CF … This report is being made pursuant to 10CFR50.72(b)(3)(ii)(B). At 15:42 on 02/02/05 while reviewing Operation Experience from another Nuclear Site, it was discovered that the design of the AC Auxiliary Power System incorporates a common circuit which could result in a bus lockout preventing the re-energization of both the Division 1 and Division 2 Essential Safety Feature (ESF) buses from either onsite or offsite power sources due to a single failure in the common portion of the circuitry. This common circuit includes various metering circuits such as System Auxiliary Transformer Wattmeters and Ammeters. Also connected to these metering loops are ground fault devices that feed breaker lockout relays. Should a failure occur on these common circuits, all breakers supplying power to these ESF Buses would be opened, locked out, and prevented from reclosure onto the buses.</br>Due to the loss of the ability to accommodate a single failure, one offsite power source and one onsite Diesel Generator have been declared inoperable and Technical Specification 3.8.1 Condition A, Condition B, and Condition E entered. Corrective actions are in progress to isolate the common circuit and eliminate the single point vulnerability.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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20:59:00, 2 February 2005 +
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21:42:00, 2 February 2005 +
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