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Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

Event Notification Report for February 10, 2011

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
02/09/2011 - 02/10/2011

** EVENT NUMBERS **

46605

Power Reactor	Event Number: 46605
Facility: LASALLE Region: 3 State: IL Unit: [1] [ ] [ ] RX Type: [1] GE-5,[2] GE-5 NRC Notified By: JOHN VAN FLEET HQ OPS Officer: MARK ABRAMOVITZ	Notification Date: 02/09/2011 Notification Time: 19:59 [ET] Event Date: 02/09/2011 Event Time: 18:04 [CST] Last Update Date: 02/09/2011
Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(A) - DEGRADED CONDITION	Person (Organization): ERIC DUNCAN (R3DO) PATRICK HILAND (NRR) JEFFERY GRANT (IRD)

Unit	SCRAM Code	RX CRIT	Initial PWR	Initial RX Mode	Current PWR	Current RX Mode
1	N	Y	6	Startup	0	Hot Shutdown

Event Text

PRESSURE BOUNDARY LEAKAGE

"At 1830 CST on 02/09/11, LaSalle Unit 1 commenced a Technical Specification required plant shutdown, due to identification of pressure boundary leakage. At 1804 CST on 02/09/11, it was identified that 1E51-F076, Reactor Core Isolation Cooling System Steam Supply Inboard Isolation Bypass Warmup Valve, had a one inch crack in a weld on the pressure seal joint. This qualifies as pressure boundary leakage, which requires entry into Tech Spec 3.4.5, RCS Operational Leakage, Required Action C, to be in Mode 3, Hot Shutdown, by 0604 on 02/10/11, and Mode 4, Cold Shutdown, by 0604 on 02/11/11 . At the time of discovery, Unit 1 was in startup mode following a forced outage. A repair plan is being prepared at this time and the Unit will remain in cold shutdown until repairs are complete."

This is an unisolable leak. Reactor pressure is 913 psig.

The licensee notified the NRC Resident Inspector.

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