ENS 53276
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ENS Event | |
|---|---|
08:00 Mar 22, 2018 | |
| Title | Technical Specification Required Shutdown Due to Pressure Boundary Leakage |
| Event Description | This notification is being provided in accordance with 10CFR50.72(b)(2)(i), Plant Shutdown required by Technical Specifications, and 10 CFR 50.72(b)(3)(ii)A, Degraded or Unanalyzed Condition.
At 0300 CDT on 3/22/18, on LaSalle Unit 1, a through-wall (welded joint) leak was identified on a 3/4 inch vent line off of the bonnet of the 1B33-F067B, 1B 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 3, Hot Shutdown, by 1500 on 3/22/18 and Mode 4, Cold Shutdown, by 1500 on 3/23/18. This leakage is significantly less than 10 gallons per minute and therefore, does not meet the threshold for entry into the Emergency Action Plan. At the time of discovery, Unit 1 was in Mode 1 - Run. Shutdown began at 0500 CDT and the estimated completion to cold shutdown is 2000 CDT. All necessary shutdown equipment is available. There is no impact to Unit 2. NRC Resident Inspector was notified. |
| Where | |
|---|---|
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 | |
| Time - Person (Reporting Time:+-0.88 h-0.0367 days <br />-0.00524 weeks <br />-0.00121 months <br />) | |
| Opened: | Wayne Clayton 07:07 Mar 22, 2018 |
| NRC Officer: | Ossy Font |
| Last Updated: | Mar 22, 2018 |
| 53276 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (24 %) |
| After | Power Operation (19 %) |
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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