ENS 47720
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ENS Event | |
|---|---|
12:24 Mar 6, 2012 | |
| Title | Notification of Unusual Event Due to Unidentified Rcs Leakage Greater than 10 Gpm |
| Event Description | 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.
NUE [Notification of Unusual Event] CU1.1, unidentified or pressure boundary leakage greater than 10 gpm that was entered at 0624 [CST] on 3/6/2012 at the Prairie Island Nuclear Plant has been terminated at 1136 on 3/6/2012. The entry criteria for CU 1.1 is no longer met as validated by a stable reactor coolant system level and no leakage found by plant walk downs. The licensee will notify the NRC Resident Inspector. Notified the R3DO (Ring), NRR-EO (Chernoff), IRD (Kozal) and the following federal agencies: DHS-SWO, FEMA, USDA, HHS, DOE, EPA, NuclearSSA and DHS-NICC. |
| 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
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 565432023-05-27T23:34:00027 May 2023 23:34:00
[Table view]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 Notification of Unusual Event Due to Multiple Fire Alarms in Containment Not Verified within 15 Minutes ENS 521782016-08-14T04:59:00014 August 2016 04:59:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Excessive Reactor Coolant System Leakage ENS 516092015-12-17T19:18:00017 December 2015 19:18:00 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 Fire Alarm in Containment Not Verified within 15 Minutes ENS 508662015-03-05T10:06:0005 March 2015 10:06:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 2 Declares Unusual Event Due to Inability to Validate a Containment Fire Alarm within 15 Minutes ENS 484642012-10-31T19:18:00031 October 2012 19:18:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Due to Security Condition ENS 477202012-03-06T12:24:0006 March 2012 12:24:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Unidentified Rcs Leakage Greater than 10 Gpm ENS 475692012-01-05T09:53:0005 January 2012 09:53:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Sodium Hypochlorite Leak Resulted in Airborne Concentrations Potentially Dangerous to Life and Health ENS 443802008-08-03T08:52:0003 August 2008 08:52:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Hydrazine Leak in Non-Vital Area of the Turbine Building 2023-05-27T23:34:00 | |
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