ENS 51721
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ENS Event | |
|---|---|
03:42 Feb 10, 2016 | |
| Title | |
| Event Description | At 2142 [CST] on February 9, 2016, Reactor Building differential pressure did not meet the required 0.25 inches of vacuum water gauge due to failure of the control system. At 2205, the Unit 3 Reactor Building Ventilation System was secured and manually isolated. The Reactor Building differential pressure returned to [greater than or equal to] 0.25 inches of vacuum water gauge at 2207.
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 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:+-1.42 h-0.0592 days <br />-0.00845 weeks <br />-0.00195 months <br />) | |
| Opened: | Edward Burns 02:17 Feb 10, 2016 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Feb 10, 2016 |
| 51721 - 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 (100 %) |
| After | Power Operation (100 %) |
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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