ENS 51013
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ENS Event | |
|---|---|
02:25 Apr 25, 2015 | |
| Title | Loss of Emergency Assessment Capability Due to Out-Of-Service Radiation Monitors |
| Event Description | At 2125 on 4/24/15, 1R-2, Containment Vessel Area Radiation Detector failed. Previously, 1R-7, Incore Seal Table Area Radiation Detector, had failed on 4/20/15. The compensatory measure for 1R-2 out-of-service is to verify 1R-7 operating properly and the compensatory measure for 1R-7 out-of-service is to verify 1R-2 operating properly. With both monitors out-of-service and Unit 1 operating in Mode 5, no compensatory measure is available that will allow timely classification of two Emergency Action Levels (EALs) - Notification of Unusual Event (NUE) classification (RU2.2) and Alert classification (RA3.2). This results in a Loss of Emergency Assessment Capability while 1R-2 and 1R-7 are concurrently out-of-service. This is a reportable condition per 10 CFR 50.72(b)(3)(xiii).
Monitoring of radiological conditions in Unit 1 Containment showed no indication of RCS leakage or elevated radiation levels prior to the failure of 1R-2. Unit 1 Containment also remains monitored by 1R-48, Containment Hi Range Area Radiation Detector A and 1R-49, Containment Hi Range Area Radiation Detector B, which currently indicate normal radiation levels. Unit 1 Shield Building Stack is also monitored by 1R-50, Shield Building High Range Vent Gas Radiation Detector, which also currently indicates normal radiation levels. Additionally, a temporary portable radiation monitor has been placed near the location of 1R-2 and is being continuously monitored. The plant remains in a safe condition and there was no effect to the health and safety of the public. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+1.75 h0.0729 days <br />0.0104 weeks <br />0.0024 months <br />) | |
| Opened: | Nathan Bibus 04:10 Apr 25, 2015 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Apr 25, 2015 |
| 51013 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 568042023-10-19T16:10:00019 October 2023 16:10:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Seismic Monitoring Capability ENS 548032020-07-29T00:49:00029 July 2020 00:49:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Failed Radiation Detector ENS 537002018-10-28T05:00:00028 October 2018 05:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitoring Panel System Inoperable ENS 532862018-03-23T21:35:00023 March 2018 21:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 515282015-11-11T14:26:00011 November 2015 14:26:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Shield Building Vent Gas Radiation Monitor Out of Service for Planned Maintenance ENS 512662015-07-27T14:02:00027 July 2015 14:02:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Outage for Plant Computer Systems ENS 510132015-04-25T02:25:00025 April 2015 02:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Due to Out-Of-Service Radiation Monitors ENS 509482015-04-02T17:30:0002 April 2015 17:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Not Available for Emergency Plan Assessment ENS 506722014-12-12T08:48:00012 December 2014 08:48:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Auxiliary Building Normal Ventilation Radiation Monitor Failed ENS 506522014-12-03T15:50:0003 December 2014 15:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Control Room Area Radiation Monitor Failed Low ENS 504872014-09-24T12:28:00024 September 2014 12:28:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Shield Building Vent Gas Radiation Monitor Out of Service for Planned Maintenance ENS 504462014-09-11T15:09:00011 September 2014 15:09:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Shield Building Vent Gas Radiation Monitor Out of Service for Planned Maintenance ENS 504242014-09-04T13:43:0004 September 2014 13:43:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness 1R-50 Shield Building High Range Vent Gas Radiation Monitor Out of Service for Planned Maintenance ENS 502662014-07-10T13:38:00010 July 2014 13:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness High Range Shield Building Vent Stack Gas Monitor Removed from Service for Maintenance ENS 500512014-04-23T15:00:00023 April 2014 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness 2R-22 Shield Building Vent Gas Radiation Monitor Removed from Service for Planned Maintenance ENS 500012014-04-04T19:53:0004 April 2014 19:53:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Seismic Monitor Declared Non-Functional Due to Spurious Alarm ENS 499432014-03-21T18:00:00021 March 2014 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Shield Building Vent Gas Rad Monitors Out of Service for Planned Maintenance ENS 498242014-02-12T17:13:00012 February 2014 17:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Circulating Water Discharge Monitor Out of Service ENS 498062014-02-07T12:20:0007 February 2014 12:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Shield Building Vent Gas Radiation Monitor Failure ENS 497992014-02-06T13:30:0006 February 2014 13:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitor Out of Service for Maintenance ENS 497452014-01-20T08:16:00020 January 2014 08:16:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Shield Building Gaseous Radiation Monitor ENS 495072013-11-06T06:58:0006 November 2013 06:58:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness R-21 Circulating Water Discharge Radiation Monitor Planned Outage ENS 492592013-08-09T15:00:0009 August 2013 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitor Out of Service ENS 486202012-12-21T13:30:00021 December 2012 13:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Data System (Erds) ENS 448282009-02-04T19:20:0004 February 2009 19:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Sirens Out of Service Due to Planned Maintenance ENS 441752008-04-29T12:50:00029 April 2008 12:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Tsc Ventillation During Scheduled Maintenance ENS 441572008-04-23T09:10:00023 April 2008 09:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Ventilation System Considered Non-Functional ENS 440712008-03-17T13:00:00017 March 2008 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Degraded Habitability Control ENS 440572008-03-12T19:30:00012 March 2008 19:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Long Term Habitability of Technical Support Center Under Accident Dose Analysis Exceeds Acceptance Criteria ENS 435152007-07-24T07:56:00024 July 2007 07:56:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Ventilation Inoperable ENS 422502006-01-11T13:43:00011 January 2006 13:43:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Modification to the Unit 2 Process Computer That Will Impact Erds and Spds ENS 421882005-12-05T15:00:0005 December 2005 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Process Computer System (Ppcs) Will Be Taken Out of Service for Approximatley 2 Weeks. 2023-10-19T16:10:00 | |
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