ENS 50670
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ENS Event | |
|---|---|
14:45 Dec 11, 2014 | |
| Title | Both Secondary Containment Airlock Doors Opened Simultaneously |
| Event Description | Station personnel simultaneously opened the inner and outer air lock doors from Unit 2 Reactor Enclosure to the Refuel Floor. Reactor Enclosure Secondary Containment Integrity was declared inoperable per Unit 2 TS 3.6.5.1.1, due to failure to meet surveillance requirement U2 TS 4.6.5.1.1.b.2, due to the report of both containment airlock doors on 352' momentarily open at the same time. Reactor Enclosure D/P [differential pressure] remained steady at 0.35 inches vacuum water gauge.
Reactor Enclosure Secondary Containment Integrity was declared operable following verification that at least one air lock door to each access of secondary containment was closed per U2 TS 4.6.5.1.1.b.2. Total time was approximately 5 seconds. The secondary containment doors do not have a mechanical interlock and this event has been classified as a human performance error. The licensee notified the NRC Resident Inspector |
| Where | |
|---|---|
Limerick  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+0.12 h0.005 days <br />7.142857e-4 weeks <br />1.64376e-4 months <br />) | |
| Opened: | John Harkins 14:52 Dec 11, 2014 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Dec 11, 2014 |
| 50670 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 580492025-11-19T08:28:00019 November 2025 08:28:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Reactor Enclosure Recirculation ENS 506702014-12-11T14:45:00011 December 2014 14:45:00 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 2025-11-19T08:28:00 | |
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