ENS 51300
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ENS Event | |
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18:40 Aug 7, 2015 | |
Title | Degraded Condition Due to Pressure Boundary Leakage on Vent Line Welded Joint |
Event Description | This notification is being provided in accordance with 10 CFR 50.72(b)(3)(ii)A, Degraded Condition.
At 1340 CDT on 8/7/15, on LaSalle Unit 2, a through-wall (welded joint) leak was identified on a 3/4 inch vent line off of the bonnet of the 2B33-F067B, 2B Reactor Recirculation Pump Discharge Valve. This condition qualifies as pressure boundary leakage, which requires entry into Technical Specification 3.4.5, Reactor Coolant System Operational Leakage, Required Action C, to be in Mode 4, Cold Shutdown, by 0140 on 8/9/15. This leakage is significantly less than 10 gpm [leak rate is 0.2 gpm] and therefore, does not meet the threshold for entry into the Emergency Action Plan. At the time of discovery, Unit 2 was in Mode 3 - Hot Shutdown, heading into Cold Shutdown for a planned maintenance outage. This event does not affect Unit 1. The licensee notified the NRC Resident Inspector. |
Where | |
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Lasalle Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
LER: | 05000374/LER-2015-003 |
Time - Person (Reporting Time:+1.3 h0.0542 days <br />0.00774 weeks <br />0.00178 months <br />) | |
Opened: | Steve Churchill 19:58 Aug 7, 2015 |
NRC Officer: | Jeff Rotton |
Last Updated: | Aug 7, 2015 |
51300 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Hot Shutdown (0 %) |
After | Hot Shutdown (0 %) |
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 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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