ENS 44864
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ENS Event | |
|---|---|
16:21 Feb 19, 2009 | |
| Title | Unusual Event Declared Due to Main Generator Hydrogen Gas Leak |
| Event Description | An Unusual Event was declared at 1021 CST due to toxic, corrosive, flammable gasses in amounts that have or could adversely affect normal plant operations. Licensee estimated that a plume of hydrogen gas 20 feet high was leaking in the Turbine Building at the North Generator Bearing. Licensee entered EAL HU3.1. There was no release above normal operating limits (0.1 Mr/hr at EAB). No offsite response required. Gas is being dissipated via emergency degassing of Main Generator. Presently, the Main Generator degas has been completed and no flammable environments remain. The Unusual Event will stay in effect until the area is accessible to personnel, as evaluated by chemistry.
There was no fire or personnel injury related to this event. The Plant was already in Mode 3 due to an earlier event requiring a Technical Specification Action 3.3.2.Q shutdown. The licensee has notified the NRC Resident Inspector, and local, state and other government agencies. No media press release was anticipated.
The hazard was eliminated by 1055 on 2/19/2008. The Unusual Event was closed out at 1115. The state and counties (Callaway, Gasconade, Montgomery, and Osage) were notified of the event closeout at 1126. A news release will be made by Ameren Corporate Communications. The licensee has notified the NRC Resident Inspector. Notified R4DO (Powers), DHS ( Cassandra McKentry) and FEMA (Mike Eaches). |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.48 h-0.187 days <br />-0.0267 weeks <br />-0.00614 months <br />) | |
| Opened: | Dennis Harris 11:52 Feb 19, 2009 |
| NRC Officer: | John Knoke |
| Last Updated: | Feb 19, 2009 |
| 44864 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 492192013-07-27T04:49:00027 July 2013 04:49:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 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 a Fire in the Turbine Building Lasting Greater than 15 Minutes ENS 472752011-09-18T15:56:00018 September 2011 15:56:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to a Freon Gas Release Into a Safe Shutdown Equipment Area ENS 458372010-04-13T17:00:00013 April 2010 17:00:00 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 Identified Leakage Exceeding 25 Gallons Per Minute ENS 448642009-02-19T16:21:00019 February 2009 16:21:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Main Generator Hydrogen Gas Leak ENS 436222007-09-07T04:22:0007 September 2007 04:22:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Leakage from Reactor Coolant System >10 Gpm ENS 432792007-04-05T15:23:0005 April 2007 15:23:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to a Fire in the Control Bulding 2013-07-27T04:49:00 | |
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