ENS Event | |
|---|---|
23:57 Dec 21, 2011 | |
| Title | Unusual Event - Hydrogen Leak in Turbine Building |
| Event Description | At 1641 CST, during preparations to synchronize the generator, hydrogen pressure began to lower. Personnel were dispatched to identify the source of the leak. At 1752 CST reports from personnel in the turbine building identified high hydrogen levels and the turbine building was evacuated. An Unusual Event [HU7] was declared at 1757 CST and state notification was completed at 1809 CST. Turbine building roof vents were opened to ventilate the turbine building and all elevations were verified to be clear of hydrogen. Access to the turbine building was restored.
The Unusual Event was terminated at 1838 CST. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Clinton  Illinois (NRC Region 3) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.02 h-0.168 days <br />-0.0239 weeks <br />-0.00551 months <br />) | |
| Opened: | Dale Shelton 19:56 Dec 21, 2011 |
| NRC Officer: | John Knoke |
| Last Updated: | Dec 21, 2011 |
| 47544 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (18 %) |
| After | Power Operation (18 %) |
WEEKMONTHYEARENS 580382025-11-14T20:02:00014 November 2025 20:02:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Loss of All Offsite Power to Vital Busses ENS 475442011-12-21T23:57:00021 December 2011 23:57:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Hydrogen Leak in Turbine Building 2025-11-14T20:02:00 | |