ENS 47151

v t e ENS Event
19:29 Aug 12, 2011
Title	High Pressure Coolant Injection System Inoperable Due to Valve Body Leak
Event Description	On Friday August 12, 2011 at 1429 CDT, a through-wall leak was discovered on the body of the High Pressure Coolant Injection (HPCI) Inlet Drain Pot Inboard Drain valve to the Main Condenser, AOV 2-2301-29. This is a safety-related, ASME Code Class 2 valve. Dresden Technical Requirements Manual 3.4.a, Condition B requires the leak to be isolated which renders the HPCI System Inoperable. The Unit 2 HPCI system was isolated and declared inoperable at 1646 CDT, and Technical Specification 3.5.1 Condition G has been entered. The HPCI system is a single train system. The event is being reported pursuant to 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.' T.S. 3.5.1 condition G is a 14 day LCO and the utility can make the repair at power. The unit is in a normal electrical lineup with offsite power available and all EDG's are operable. There was a slight increase in plant risk to "yellow" as a result of this issue. The NRC Resident Inspector has been notified.

ENS 47151 +/-
Where
Dresden Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+0.85 h0.0354 days <br />0.00506 weeks <br />0.00116 months <br />)
Opened:	Phillip Prater 20:20 Aug 12, 2011
NRC Officer:	Joe O'Hara
Last Updated:	Aug 12, 2011
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v • d • e

v t e Emergency Notification System
Dresden with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2023-11-20T15:56:00 [Table view]
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