ENS 43518

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v t e ENS Event
21:45 Jul 24, 2007
Title	High Pressure Coolant Injection Inoperable Due To Failed Power Supply
Event Description	At 1645 on 7/24/07 during the transfer to the Normal Power Supply of the 3A 250 RMQV Board upon completion of scheduled maintenance. Unit 3 High Pressure Coolant Injection system received a 120 VAC Power Failure and was declared inoperable. 120VAC HPCI power is supplied by the Unit 3 ECCS Div 2 Analog Trip Unit Inverter. The Inverter lost power during the 250vdc board transfer and was not able to be restored to service. Investigation is still continuing on the failure of the Div 2 ECCS Inverter. This event is reportable as an 8-hour Non-Emergency Notification in accordance with 10 CFR 50.72 (b)(3)(v)(B) as; 'Any event or condition that at the time of discovery could have prevented the fulfillment of the Safety Function of structures or systems that are needed to: Remove Residual Heat' ; and 10 CFR 50.72 (b)(3)(v)(D), 'any event or condition that at the time of discovery could have prevented the fulfillment of the Safety Function of structures or systems that are needed to; mitigate the consequences of an accident.' This event also requires a 60 day written report in accordance with 10 CFR 50.73 (a)(2)(v)(B) and 10 CFR 50.73 (a)(2)(v)(D). NRC EVENT # 43518 was reported to Mr. Kozal and the NRC Resident (C. Stancil) was notified at 1925 CDST on 07/24/07.

ENS 43518 +/-
Where
Browns Ferry Alabama (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+0.33 h0.0138 days <br />0.00196 weeks <br />4.52034e-4 months <br />)
Opened:	Tim A Golden 22:05 Jul 24, 2007
NRC Officer:	Jason Kozal
Last Updated:	Jul 24, 2007
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v • d • e

v t e Emergency Notification System
Browns Ferry with 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2024-03-19T15:30:00 [Table view]
[ENS list for Browns Ferry]

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