ENS 47543
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ENS Event | |
|---|---|
18:00 Dec 21, 2011 | |
| Title | Plant Computer Calculation Incorrect for Back-Up Meteorological Data |
| Event Description | During specification review of the computer points for the Monticello Nuclear Generating Plant backup meteorological tower (MET), it was identified by the station that the computer program software for the backup MET had not calculated the correct 15 minute average wind direction in all instances, A review and analysis of the historical data revealed that there were times that this condition existed when the site's primary MET had been out-of-service for maintenance or equipment issues. During those times the backup MET was relied on for determination of wind direction. Analysis determined that during those times the potential existed to incorrectly report affected sectors for Protective Action Recommendations.
Currently the station's primary MET has been verified to be in service and functioning properly. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Monticello  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-2.37 h-0.0988 days <br />-0.0141 weeks <br />-0.00325 months <br />) | |
| Opened: | Randy Sand 15:38 Dec 21, 2011 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Dec 21, 2011 |
| 47543 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 532852018-03-23T17:30:00023 March 2018 17:30:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessement Capability ENS 527812017-06-01T21:45:0001 June 2017 21:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Lost Ability to Receive Meteorogic Data ENS 521532016-08-04T19:15:0004 August 2016 19:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Battery Room Fire Detection System Inoperable ENS 504962014-09-26T03:00:00026 September 2014 03:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Containment Isolation Declared Inoperable Due to Relay Age ENS 504112014-08-28T14:00:00028 August 2014 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Both Discharge Canal Radiation Monitors Removed from Service for Planned Maintenance ENS 503642014-08-14T12:55:00014 August 2014 12:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Radiation Monitor Nonfunctional for Planned Maintenance ENS 503272014-07-31T12:20:00031 July 2014 12:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Radiation Monitor Out of Service for Maintenance ENS 502252014-06-25T05:00:00025 June 2014 05:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Various Telecommunication Lines and Erds Outage for Planned Maintenance ENS 501752014-06-05T21:01:0005 June 2014 21:01:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Discharge Canal Radiation Monitors Removed from Service for Planned Maintenance ENS 501362014-05-23T16:30:00023 May 2014 16:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability Due to Failed Area Radiation Monitor ENS 500772014-05-01T13:40:0001 May 2014 13:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Radiation Monitor Taken Out of Service for Planned Maintenance ENS 500052014-04-07T20:00:0007 April 2014 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Removal of Radiation Monitors from Service for Planned Maintenance ENS 498462014-02-21T07:30:00021 February 2014 07:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Failed Power Supply Affecting Radiation Monitors ENS 498202014-02-12T14:15:00012 February 2014 14:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Radiation Monitor Removed from Service for Planned Maintenance ENS 495862013-11-27T13:40:00027 November 2013 13:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Service Water Radiation Monitor Removed from Service ENS 495802013-11-26T10:00:00026 November 2013 10:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Discharge Canal Radiation Monitor Removed from Service ENS 493902013-09-27T18:30:00027 September 2013 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Due to Radiation Monitors Out of Service ENS 493882013-09-27T13:20:00027 September 2013 13:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Planned Maintenance ENS 490482013-05-17T20:27:00017 May 2013 20:27:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Process Computer Removed from Service for Maintenance and Upgrades ENS 486182012-12-21T13:30:00021 December 2012 13:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Data System (Erds) ENS 483782012-10-04T21:00:0004 October 2012 21:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Primary and Backup Meteorological Towers Out of Service ENS 483452012-09-26T13:00:00026 September 2012 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Planned Maintenance Activity ENS 481092012-07-16T19:03:00016 July 2012 19:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Ac Power to Emergency Operations Facility ENS 479502012-05-22T22:32:00022 May 2012 22:32:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Fifty-Eight Sirens Were Not Functional in Wright County Minnesota ENS 475432011-12-21T18:00:00021 December 2011 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Computer Calculation Incorrect for Back-Up Meteorological Data ENS 472122011-08-29T11:00:00029 August 2011 11:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Planned Maintenance Activity ENS 468332011-05-10T14:15:00010 May 2011 14:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 467272011-04-05T19:30:0005 April 2011 19:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Loss of Emergency Assessment Capability for Scheduled Maintenace ENS 462802010-09-25T07:57:00025 September 2010 07:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Erds, Spds and Tsc Phone Lines Due to Uninteruptable Power Supply Failure ENS 461522010-08-06T12:00:0006 August 2010 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center (Tsc) Planned Maintenance Activity ENS 460162010-06-16T15:15:00016 June 2010 15:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Sirens ENS 458302010-04-10T13:00:00010 April 2010 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Phone System Out of Service for Planned Maintenance ENS 452472009-08-06T11:00:0006 August 2009 11:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance to Affect Technical Support Center ENS 447972009-01-22T15:30:00022 January 2009 15:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Phone Communications ENS 438472007-12-17T08:03:00017 December 2007 08:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability (Spds) ENS 437882007-11-16T17:00:00016 November 2007 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Degredation of Emergency Preparedness Response Capabilities ENS 434922007-07-17T12:00:00017 July 2007 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Inoperable Due to Planned Relocation 2018-03-23T17:30:00 | |
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