ENS 46625

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v t e ENS Event
16:45 Feb 18, 2011
Title	Unusual Event- Excessive Leakage from a Charging System
Event Description	At 1045 CST, on 2/18/11, Comanche Peak Unit 1 declared an Unusual Event related to excessive leakage from the charging system. The 40 GPM leakage was in excess of the specified limit of 25 GPM. At 1121 CST, the charging system leakage was verified isolated. Unit 1 is in stable condition and remains at 100% power. No offsite assistance is required at this time. * * UPDATE FROM TERRY MARSH TO DONG PARK AT 1438 EST ON 2/18/11 * * * At 1311 EST, Comanche Peak Nuclear Power Plant has terminated the Unusual Event. The leaking valve in the charging system has been isolated reducing the leakage to zero. Repairs to the valve are in planning." The licensee notified the NRC Resident Inspector. The licensee notified the Texas Department of Public Safety and will be making a press release to the local press. Notified R4DO (Gaddy), IRD (Gott), NRR EO (Thorp), DHS (McDonald) and FEMA (Via). * * RETRACTION FROM RAY FISHENCORD TO JOHN SHOEMAKER AT 0810 EST ON 2/24/11 * * * This is a follow-up notification to inform the NRC that Comanche Peak Nuclear Power Plant is retracting Event Number 46625, the Unusual Event declaration reported on February 18, 2011 at 10:45 Central Standard Time. The declaration was made based on EAL SU8.1, [Reactor Coolant System] RCS Leakage, and was terminated on February 18, 2011 at 13:11 Central Standard Time. The declaration is retracted because the source of the leakage was from the Chemical and Volume Control System (CVCS) and not from the Reactor Coolant System. The licensee has notified the NRC Resident Inspector. Notified R4DO (Campbell)

ENS 46625 +/- *RETRACTED*
Where
Comanche Peak Texas (NRC Region 4)
Reporting
Emergency class:	Unusual Event
10 CFR 50.72(a) (1) (i), Emergency Class Declaration
Time - Person (Reporting Time:+-4.48 h-0.187 days <br />-0.0267 weeks <br />-0.00614 months <br />)
Opened:	Alex Ibarra 12:16 Feb 18, 2011
NRC Officer:	Vince Klco
Last Updated:	Feb 24, 2011
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v • d • e

v t e Emergency Notification System
Comanche Peak with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration
WEEKMONTHYEAR2014-06-12T02:40:00 [Table view]
[ENS list for Comanche Peak]

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