ENS 46605
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ENS Event | |
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00:04 Feb 10, 2011 | |
Title | |
Event Description | 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. |
Where | |
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Lasalle Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
LER: | 05000373/LER-2011-002 |
Time - Person (Reporting Time:+-4.08 h-0.17 days <br />-0.0243 weeks <br />-0.00559 months <br />) | |
Opened: | John Van Fleet 19:59 Feb 9, 2011 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Feb 9, 2011 |
46605 - NRC Website
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LaSalle with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
WEEKMONTHYEARENS 532762018-03-22T08:00:00022 March 2018 08:00:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Technical Specification Required Shutdown Due to Pressure Boundary Leakage ENS 513002015-08-07T18:40:0007 August 2015 18:40:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition Due to Pressure Boundary Leakage on Vent Line Welded Joint ENS 489772013-04-28T02:24:00028 April 2013 02:24:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Technical Specification Required Plant Shutdown ENS 489432013-04-18T19:00:00018 April 2013 19:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pin Holes Leaks Identified in High Pressure Core Spray System ENS 466052011-02-10T00:04:00010 February 2011 00:04:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pressure Boundary Leakage ENS 461712010-08-13T00:52:00013 August 2010 00:52:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Environmental Conditions Resulting in Elevated Ultimate Heat Sink Temperature ENS 454262009-10-12T08:33:00012 October 2009 08:33:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Due to Unidentified Leakage from Rcs ENS 414872005-03-13T00:30:00013 March 2005 00:30:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Pinhole Leak in Instrument Drain Line Off Main Steam System 2018-03-22T08:00:00 | |
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