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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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