ENS 47720: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 03/06/2012 06:24 CST | | event date = 03/06/2012 06:24 CST | ||
| last update date = 03/06/2012 | | last update date = 03/06/2012 | ||
| title = Notification | | title = Notification of Unusual Event Due to Unidentified Rcs Leakage Greater than 10 Gpm | ||
| event text = Unidentified or pressure boundary leakage greater than 10 gpm [was indicated] due to changing Reactor Coolant System (RCS) level. Investigation of the event indicates that the reactor vessel head vent spool piece was removed at the time the RCS level started decreasing. A vacuum existed in the RCS at the time of removal of the spool piece which caused air to enter the reactor vessel head. The RCS level decrease was due to this. The charging system was placed in service at 80 gpm to regain the RCS level back to the original level. A walk down of all plant areas where leakage could have occurred has been completed with no leakage found. The charging system has been secured and RCS level is stable at this time. | | event text = Unidentified or pressure boundary leakage greater than 10 gpm [was indicated] due to changing Reactor Coolant System (RCS) level. Investigation of the event indicates that the reactor vessel head vent spool piece was removed at the time the RCS level started decreasing. A vacuum existed in the RCS at the time of removal of the spool piece which caused air to enter the reactor vessel head. The RCS level decrease was due to this. The charging system was placed in service at 80 gpm to regain the RCS level back to the original level. A walk down of all plant areas where leakage could have occurred has been completed with no leakage found. The charging system has been secured and RCS level is stable at this time. | ||
The licensee notified the NRC Resident Inspector, the State of Minnesota, the State of Wisconsin, and local authorities in both states. The licensee will be issuing a press release. | The licensee notified the NRC Resident Inspector, the State of Minnesota, the State of Wisconsin, and local authorities in both states. The licensee will be issuing a press release. | ||
Latest revision as of 21:04, 1 March 2018
| Where | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.13 h-0.172 days <br />-0.0246 weeks <br />-0.00566 months <br />) | |
| Opened: | Steve Schmidt 08:16 Mar 6, 2012 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Mar 6, 2012 |
| 47720 - NRC Website
| |