ENS 49318
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ENS Event | |
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10:46 Sep 3, 2013 | |
Title | Secondary Containment Access Air Lock Doors Opened Simultaneously Resulting in Momentary Degradation |
Event Description | During planned maintenance activities, station personnel simultaneously opened the inner and outer airlock doors from unit 2 reactor enclosure to the U2 reactor enclosure HVAC room, resulting in a lowering of reactor enclosure delta pressure to below the tech spec minimum required value. The airlock doors were closed within approximately 5 seconds and reactor enclosure delta pressure recovered to greater than the tech spec minimum required value within approximately 20 seconds.
Unit 2 secondary containment was declared inoperable for the time that reactor enclosure delta pressure was below the tech spec minimum required value, and was declared operable when reactor enclosure delta pressure recovered to greater than the tech spec minimum required value. Total Limiting Condition of Operation time was approximately 20 seconds. The licensee has notified the NRC Resident Inspector. |
Where | |
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Limerick Pennsylvania (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
LER: | 05000353/LER-2013-002 |
Time - Person (Reporting Time:+3.4 h0.142 days <br />0.0202 weeks <br />0.00466 months <br />) | |
Opened: | Chris Giambrone 14:10 Sep 3, 2013 |
NRC Officer: | Bill Huffman |
Last Updated: | Sep 3, 2013 |
49318 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 506702014-12-11T14:45:00011 December 2014 14:45:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Secondary Containment Airlock Doors Opened Simultaneously ENS 497062014-01-09T16:35:0009 January 2014 16:35:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Entry Into & Exit from Technical Specification 3.6.5.1.1 Due to Open Air Lock Doors ENS 496592013-12-18T19:09:00018 December 2013 19:09:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Unit 2 Secondary Containment Integrity ENS 496512013-12-18T14:39:00018 December 2013 14:39:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Unit 1 Secondary Containment Integrity ENS 495262013-11-10T18:51:00010 November 2013 18:51:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Integrity Momentarily Declared Inoperable ENS 493182013-09-03T10:46:0003 September 2013 10:46:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Access Air Lock Doors Opened Simultaneously Resulting in Momentary Degradation ENS 483342012-09-21T20:00:00021 September 2012 20:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Isolation Valves Could Fail to Fully Close ENS 453072009-08-28T03:10:00028 August 2009 03:10:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Non-Conservative Technical Specification Setpoints Discovered 2014-12-11T14:45:00 | |
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