ENS 41792
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ENS Event | |
|---|---|
06:21 Jun 24, 2005 | |
| Title | Licensee Declared an Unusual Event Due to Detection of a Flammable Gas in the General Services Building |
| Event Description | An NOUE was declared at the site at 2327 PDT due to the discovery of flammable gas in the General Services Building (office space) which is attached to the turbine and reactor building. The source and type of gas has not been identified and investigation is ongoing by HAZMAT trained personnel. The highest level of flammability measured is 50% of LEL (Lower Explosive Limit). The building has been evacuated.
The NRC Resident Inspector will be notified and State local and other Gov agencies have been notified.
EAL # 9.3.U.3 - Report or detection of toxic or flammable gases that could enter or have entered within the Protected Area Boundary in amounts that could affect the health of plant personnel or safe plant operation. The event has been terminated based on a thorough survey of the building by HAZMAT personnel. The building in question has been determined to be free of any flammable gases. Probable source of gas is from a sewage treatment plant. The gas was carried by a stable breeze to the building's air intake. Immediately prior to the event, initial reports of odorous gas from several building occupants was confirmed using portable instrumentation. The highest flammable gas levels were found at a building air intake. Dissipation of gas concentration was accomplished using normal building ventilation. The NRC Resident Inspector will be notified and State local and other Gov agencies have been notified. Notified R4 DO (R. Bywater), NRR EO (M. Case), IRD Manager (S. Frant), DHS (Ceasar), and FEMA (Sullivan). |
| Where | |
|---|---|
Columbia Generating Station  Washington (NRC Region 4) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.4 h-0.142 days <br />-0.0202 weeks <br />-0.00466 months <br />) | |
| Opened: | Darrell Fujiyoshi 02:57 Jun 24, 2005 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Jun 24, 2005 |
| 41792 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Shutdown (0 %) |
| After | Hot Shutdown (0 %) |
WEEKMONTHYEARENS 467392011-04-07T23:07:0007 April 2011 23:07:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Hydrogen Burn During Maintenance ENS 452452009-08-05T14:50:0005 August 2009 14:50:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Toxic Gas from a Switchgear Fire in the Turbine Building ENS 451692009-06-27T03:05:00027 June 2009 03:05:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Based on Fire Lasting Greater than 15 Minutes ENS 432902007-04-07T20:44:0007 April 2007 20:44:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Fire in the Reactor Protection System Division 2 Equipment Room ENS 424502006-03-28T21:57:00028 March 2006 21:57:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Due to Range Brush Fire Near Plant ENS 417922005-06-24T06:21:00024 June 2005 06:21:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Licensee Declared an Unusual Event Due to Detection of a Flammable Gas in the General Services Building ENS 415652005-04-06T00:12:0006 April 2005 00:12:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Under E.A.L. 9-3.U.1 ENS 409102004-07-30T17:00:00030 July 2004 17:00:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared at Columbia Generating Station 2011-04-07T23:07:00 | |
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