ENS 50989
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ENS Event | |
|---|---|
18:20 Apr 16, 2015 | |
| Title | Both Secondary Containment Airlock Doors Open Simultaneously |
| Event Description | At 1320 CDT, on April 16, 2015, both doors of a Secondary Containment Airlock were reported to be open. The doors being open at the same time caused a failure to meet SR 3.6.4.1.2 to verify that either the outer door(s) or inner door(s) in each Secondary Containment access opening are closed. The identified condition caused Secondary Containment to be considered inoperable per TS LCO 3.6.4.1. Upon discovery, immediate action was taken to close the doors. The doors were open concurrently for a momentary amount of time. The action to close the door allowed SR 3.6.4.1.2 to be met, and restored Secondary Containment to an operable status.
The notification is being made pursuant to 10 CFR 50.72(b)(3)(v)(C). The NRC Resident Inspector has been notified. The licensee is investigating how the electrical interlock failed to prevent this occurrence. |
| Where | |
|---|---|
Duane Arnold  Iowa (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| LER: | 05000331/LER-2015-003 |
| Time - Person (Reporting Time:+-0.23 h-0.00958 days <br />-0.00137 weeks <br />-3.15054e-4 months <br />) | |
| Opened: | Hans Olson 18:06 Apr 16, 2015 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Apr 16, 2015 |
| 50989 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Duane Arnold with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
WEEKMONTHYEARENS 534962018-07-09T05:00:0009 July 2018 05:00:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 525112017-01-26T09:00:00026 January 2017 09:00:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Containment Valves Failed Surveillance Testing ENS 520532016-06-29T14:40:00029 June 2016 14:40:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 520222016-06-19T20:33:00019 June 2016 20:33:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 513532015-08-27T12:52:00027 August 2015 12:52:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 509892015-04-16T18:20:00016 April 2015 18:20:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Secondary Containment Airlock Doors Open Simultaneously ENS 509142015-03-21T05:30:00021 March 2015 05:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Secondary Containment Doors Opened Simultaneously ENS 505602014-10-23T06:07:00023 October 2014 06:07:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Both Airlock Doors Open Simultaneously ENS 503752014-08-15T17:18:00015 August 2014 17:18:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Standby Gas Treatment System Inoperable ENS 501532014-05-30T12:59:00030 May 2014 12:59:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Airlock Inoperable for 10 Seconds ENS 498382014-02-18T15:44:00018 February 2014 15:44:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Momentary Loss of Secondary Containment ENS 496572013-12-18T14:30:00018 December 2013 14:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Doors in Secondary Containment Airlock Opened Concurrently ENS 482122012-08-20T20:20:00020 August 2012 20:20:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Rwcu System Isolation Differential Flow - High Function Inoperable ENS 477092012-02-29T18:22:00029 February 2012 18:22:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Isolation Dampers Fail to Close During Quarterly Surveillance ENS 417852005-06-20T08:08:00020 June 2005 08:08:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Standby Gas Treatment Trains Briefly Inoperable During Testing 2018-07-09T05:00:00 | |
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