ENS 53069
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ENS Event | |
|---|---|
17:18 Nov 14, 2017 | |
| Title | Unusual Event Declared Due to Hydrogen Line Leak |
| Event Description | At 1118 CST on 11/14/17, Cooper Nuclear Generating Station declared an Unusual Event due to a hydrogen leak on a main generator purge line. The leak was reported to be caused by Maintenance cutting into a one inch line. The total size of the leak is unknown, however, it is estimated to be depressurizing in the main generator at approximately 1lb per hour. The current pressure is 52 to 53 lbs. pressure and is stable. The operations staff have entered their abnormal procedure and are taking actions to isolate the leak. Operators have isolated the source of hydrogen and have opened the exterior roll up doors to increase the airflow and minimize the concentration of hydrogen in the area. The area has been evacuated and hot work has been stopped.
The NRC Resident Inspector has been notified. Notified DHS, FEMA, NICC and NNSA (via email).
On 11/14/2017, Nebraska Public Power District will issue a press release concerning the declaration of a Notification of Unusual Event (EN#53069) declared today at 1118 [CST] for a small hydrogen leak in the turbine building. This is a four hour report per 10CFR50.72(b)(2)(xi) for any event or situation for which a news release is planned or notification to other government agencies has been or will be made which is related to heightened public or government concern. Notified the R4DO (Kozal).
At 1744 CST the licensee exited from the Unusual Event. The leak was patched under a temporary repair. The patch was tested to verify the leak has stopped. The NRC Resident Inspector was notified. Notified the R4DO (Kozal), IRDMOC (Gott), NRR EO (Miller), DHS, FEMA, NICC and NNSA (via email). |
| Where | |
|---|---|
Cooper  Nebraska (NRC Region 4) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-4.6 h-0.192 days <br />-0.0274 weeks <br />-0.0063 months <br />) | |
| Opened: | Trent Slydon 12:42 Nov 14, 2017 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Nov 14, 2017 |
| 53069 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Cooper with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 567862023-10-10T20:53:00010 October 2023 20:53:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Spurious Alarm Actuation ENS 557032022-01-13T14:06:00013 January 2022 14:06:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Spurious Siren Actuation ENS 540992019-06-04T13:15:0004 June 2019 13:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Issuance of Press Release Due to Spurious Actuation of Emergency Sirens ENS 539342019-03-15T10:46:00015 March 2019 10:46:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration En Revision Imported Date 3/25/2019 ENS 538092018-12-29T06:00:00029 December 2018 06:00:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Due to Toxic Gas and Fire ENS 534162018-05-22T14:00:00022 May 2018 14:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Unplanned Public Notification During a Drill ENS 530742017-11-16T02:07:00016 November 2017 02:07:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Public Prompt Notification System Capability ENS 530692017-11-14T17:18:00014 November 2017 17:18:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Hydrogen Line Leak ENS 527652017-05-19T13:05:00019 May 2017 13:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Nonfunctional Radio Transmission Tower Affects Tone Alert Radios ENS 522792016-10-04T20:30:0004 October 2016 20:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Cooper Nuclear Station Loss of Tone Alert Radios ENS 522622016-09-25T14:15:00025 September 2016 14:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Cooper Nuclear Station Loss of Tone Alert Radios ENS 522212016-09-03T12:10:0003 September 2016 12:10:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Seismic Event Alarm ENS 518872016-04-27T13:23:00027 April 2016 13:23:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Tone Alert Radio System Tower ENS 516172015-12-22T01:55:00022 December 2015 01:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Tone Alert Radio System Tower ENS 513472015-08-26T13:50:00026 August 2015 13:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Regarding Material Being Released and Recovered ENS 509242015-03-25T22:19:00025 March 2015 22:19:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Effluent Below National Pollutant Discharge Elimination System Ph Limits ENS 505302014-10-13T18:27:00013 October 2014 18:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Dropped Control Rod During Refueling Operations ENS 503382014-08-03T20:49:0003 August 2014 20:49:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Pager Notification System Message ENS 503052014-07-24T17:13:00024 July 2014 17:13:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Message Transmitted Via Emergency Response Siren ENS 497912014-02-04T13:38:0004 February 2014 13:38:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Fatality on Site ENS 477602012-03-22T15:34:00022 March 2012 15:34:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event - Potentially Hazardous Atmosphere Due to Freon Leak ENS 469702011-06-20T00:40:00020 June 2011 00:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Release of Oil to the Missouri River ENS 469692011-06-19T09:02:00019 June 2011 09:02:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Missouri River Flooding ENS 469412011-06-09T14:20:0009 June 2011 14:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Concerning Inability to Meet Sludge Pond Discharge Permit Due to River Levels ENS 467562011-04-14T21:25:00014 April 2011 21:25:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Nebraska Department of Environmental Quality ENS 460332010-06-22T07:06:00022 June 2010 07:06:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration River Water Level Above 899 Feet ENS 460172010-06-16T17:33:00016 June 2010 17:33:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to the Nebraska Department of Environmental Quality ENS 454282009-10-12T21:03:00012 October 2009 21:03:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Small Fire Lasting Greater than 10 Minutes ENS 429852006-11-11T11:30:00011 November 2006 11:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to an Electrical Fire Involving Heat Trace ENS 427282006-07-25T20:41:00025 July 2006 20:41:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Fire Alarm ENS 424662006-04-02T19:04:0002 April 2006 19:04:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Adverse Weather Conditions ENS 424312006-03-20T13:56:00020 March 2006 13:56:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Small Fire Inside Protected Area ENS 418282005-07-08T14:15:0008 July 2005 14:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Related to Improperly Packaged Radioactive Waste Material Shipment ENS 402622003-10-20T20:26:00020 October 2003 20:26:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Nebraska Department of Environmental Quality ENS 402542003-10-16T17:30:00016 October 2003 17:30:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event at Cooper Due to Small Fire at a Turbine Bearing ENS 402142003-10-02T14:10:0002 October 2003 14:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to U.S. Fish and Wildlife Service and Nebraska Game and Parks Commission 2023-10-10T20:53:00 | |
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