ENS 51374
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ENS Event | |
|---|---|
15:10 Sep 5, 2015 | |
| Title | Secondary Containment Inoperable Due to Loss of Vacuum from Open Inspection Hatch |
| Event Description | At 1010 [CDT] on September 5, 2015, Reactor Building differential pressure did not meet the required 0.25 inches of vacuum due to an open inspection hatch. At 1018 [CDT], an inspection hatch was found to have fallen open and [was] subsequently closed [manually] on the Reactor Building exhaust fan damper access hatch. The damper is outside of the Reactor Building secondary containment isolation boundary. Following closure of the hatch, Reactor Building differential pressure returned to greater than or equal to 0.25 inches of vacuum water gauge.
This condition represents a failure to meet Surveillance Requirement 3.6.4.1.1. As a result, entry into Technical Specifications 3.6.4.1 condition A was made due to Secondary Containment being inoperable. 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 Senior Resident Inspector has been notified. |
| 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:+2.23 h0.0929 days <br />0.0133 weeks <br />0.00305 months <br />) | |
| Opened: | Lauren Sykora 17:24 Sep 5, 2015 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Sep 5, 2015 |
| 51374 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (80 %) |
| After | Power Operation (80 %) |
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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