ENS 49503
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ENS Event | |
|---|---|
14:42 Nov 5, 2013 | |
| Title | Secondary Containment Declared Inoperable Due to Failure of Interlock Mechanism |
| Event Description | At 08:42 [CST] on November 5, 2013, indication was received in the Control Room that two Secondary Containment doors, in one access opening, were opened simultaneously. The interlock mechanism preventing both doors from operating simultaneously did not operate as expected. A worker in the field reported that the Turbine Building side door was opened, and simultaneously the Reactor Building side door opened several inches and then quickly re-closed. This condition represents a failure to meet Surveillance Requirement 3.6.4.1.2. As a result, entry into Technical Specification 3.6.4.1, Condition A, was made momentarily due to Secondary Containment being inoperable. The doors were secured at 08:42 and Secondary Containment was declared Operable. This event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(C) as a condition that could have prevented the fulfillment of a safety function.
The NRC Resident Inspector has been notified. See similar events 49153 and 49379. The licensee is tracking the failure as Incident Report 01581320. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+1.13 h0.0471 days <br />0.00673 weeks <br />0.00155 months <br />) | |
| Opened: | Jeff Simpson 15:50 Nov 5, 2013 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Nov 5, 2013 |
| 49503 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (91 %) |
| After | Power Operation (91 %) |
WEEKMONTHYEARENS 538512019-01-30T15:10:00030 January 2019 15:10:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 525822017-03-01T00:25:0001 March 2017 00:25:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Short Duration Loss of Secondary Containment Due to Severe Weather ENS 523552016-11-08T11:10:0008 November 2016 11:10:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Reactor Building to Atmosphere Differential Pressure Out of Specifications ENS 517212016-02-10T03:42:00010 February 2016 03:42:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable ENS 513742015-09-05T15:10:0005 September 2015 15:10:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Loss of Vacuum from Open Inspection Hatch ENS 513712015-09-04T13:10:0004 September 2015 13:10:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Both Airlock Doors Being Open Simultaneously ENS 499632014-03-27T06:51:00027 March 2014 06:51:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Failure of Secondary Containment Door Interlock ENS 495902013-11-28T08:58:00028 November 2013 08:58:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Declared Inoperable While Two Secondary Containment Doors Were Simultaneously Open ENS 495432013-11-16T16:19:00016 November 2013 16:19:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Failure of Secondary Containment Interlock Mechanism ENS 495032013-11-05T14:42:0005 November 2013 14:42:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Declared Inoperable Due to Failure of Interlock Mechanism ENS 493792013-09-23T21:55:00023 September 2013 21:55:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Secondary Containment Access Doors Opened Simultaneously ENS 491532013-06-28T12:49:00028 June 2013 12:49:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Door Interlock Malfunction Resulted in Brief Loss of Secondary Containment ENS 475402011-12-21T06:46:00021 December 2011 06:46:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Unit Two Secondary Containment Doors Were Inadvertently Left Open 2019-01-30T15:10:00 | |
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