ENS 41829

v t e ENS Event
23:15 Jul 8, 2005
Title	Startup Transformers Declared Inoperable Based on Potential Undervoltage Condition
Event Description	PTN (Turkey Point) received a notification from System Operations that switchyard voltage limits (based upon System Operations Contingency Analysis) was forecasted to exceed switchyard voltage limits if Unit 3 had tripped. This condition existed from 1434 to 1448 on July 8, 2005. At 1915 on July 8, 2005, PTN determined that both Unit 3 and 4 Startup Transformers were inoperable at 1434 on July 8, 2005, and entered Technical Specification 3.8.1.1 action e. This action was to notify the NRC within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; and to restore at least one of the inoperable Startup Transformers to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. At 1448 on July 8, 2005, both Startup Transformers were declared OPERABLE and PTN exited Technical Specification 3.8.1.1 action e. The licensee stated that the potential for low grid voltage at the Turkey Point Nuclear Plant was based on offsite conditions and was a postulated condition. Low voltage conditions did not actually occur. The licensee notified the NRC Resident Inspector.

ENS 41829 +/-
Where
Turkey Point Florida (NRC Region 2)
Reporting

Information Only
Time - Person (Reporting Time:+-0.43 h-0.0179 days <br />-0.00256 weeks <br />-5.89014e-4 months <br />)
Opened:	Michael Murphy 22:49 Jul 8, 2005
NRC Officer:	Bill Huffman
Last Updated:	Jul 8, 2005
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v t e Emergency Notification System
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