ENS 49702
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ENS Event | |
|---|---|
18:10 Jan 8, 2014 | |
| Title | Loss of Assessment Capability - Non-Functional Area Radiation Monitors |
| Event Description | At [1010 PST] on 1/08/14, during performance of a surveillance the power supply for ten area radiation monitors in the Reactor Building was found with voltage out of specification. As a result, the affected area radiation monitors were declared non-functional. This condition represents a major loss of assessment capability and is being reported as such under 10 CFR 50.72 (b)(3)(xiii). As directed by station procedures, compensatory measures have been enacted until the power supply is restored.
The Resident Inspector has been notified.
The power supply voltage has been restored to specification per applicable station procedures. All affected area radiation monitors have been declared functional. Compensatory measures have been suspended. The licensee has notified the NRC Resident Inspector.
Licensee is retracting this event notification based on the following: Energy Northwest performed an evaluation for the reported out-of-specification voltage condition for the power supply to several radiation monitors in the Reactor Building. The evaluation concluded that the voltage deviation from the -24 VDC set point was small and within the calculated uncertainty for the instrument, and did not result in equipment failure. Therefore, it was concluded that the radiation monitors were functional and that the reported major loss of assessment capability did not occur. The licensee has notified the NRC Resident Inspector. Notified R4DO (Farnholtz). |
| Where | |
|---|---|
Columbia Generating Station  Washington (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+1.65 h0.0688 days <br />0.00982 weeks <br />0.00226 months <br />) | |
| Opened: | Russell Long 19:49 Jan 8, 2014 |
| NRC Officer: | Gerond George |
| Last Updated: | Mar 13, 2014 |
| 49702 - NRC Website | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 544662020-01-08T02:55:0008 January 2020 02:55:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Seismic Assessment Instrumentation ENS 544092019-11-25T16:54:00025 November 2019 16:54:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness En Revision Imported Date 11/28/2019 ENS 537752018-12-04T08:00:0004 December 2018 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 517332016-02-13T18:00:00013 February 2016 18:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radwaste Building Noble Gas Monitor Out-Of-Service ENS 510942015-05-28T05:17:00028 May 2015 05:17:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Area Radiation Monitors Non-Functional During Planned Bus Outage ENS 510272015-04-30T01:11:00030 April 2015 01:11:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Rod Position Indicator System (Rpis) Unplanned Outage ENS 510682015-04-03T07:00:0003 April 2015 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Radiological Assessment Capability Due to Non-Functional Radiation Monitor ENS 505692014-10-23T17:46:00023 October 2014 17:46:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Turbine Building Exhaust Sample Rack Declared Non-Functional ENS 503802014-08-19T14:33:00019 August 2014 14:33:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability ENS 503412014-08-05T00:01:0005 August 2014 00:01:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radwaste Building Radiation Monitoring Sample Rack Declared Nonfunctional ENS 502942014-07-22T13:35:00022 July 2014 13:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitoring Sample Rack Declared Non-Functional ENS 502592014-07-04T09:33:0004 July 2014 09:33:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Turbine Building Process Radiation Monitoring Non-Functional ENS 501822014-06-09T14:15:0009 June 2014 14:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitoring Sample Rack Declared Non-Functional ENS 500842014-05-03T02:20:0003 May 2014 02:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Reactor Building Stack Radiation Monitor Failure ENS 498412014-02-19T16:29:00019 February 2014 16:29:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Primary Containment Oxygen and Hydrogen Monitoring ENS 497652014-01-27T08:45:00027 January 2014 08:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Turbine and Rad Waste Buildings Radiation Monitors Inoperable Due to Planned Maintenance ENS 497022014-01-08T18:10:0008 January 2014 18:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability - Non-Functional Area Radiation Monitors ENS 497002014-01-07T20:10:0007 January 2014 20:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Reactor Building Stack Monitor Temporarily Out of Service for Maintenance ENS 496612013-12-19T16:38:00019 December 2013 16:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Both Divisions of Primary Containment Oxygen and Hydrogen Atmospheric Monitors Inoperable for Maintenance ENS 496452013-12-17T19:33:00017 December 2013 19:33:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Reactor Building Stack Radiation Monitor Inoperable Due to Scheduled Maintenance on Supporting Equipment ENS 496262013-12-12T12:36:00012 December 2013 12:36:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Both Trains of Primary Containment Hydrogen and Oxygen Monitors Out of Service for Maintenance ENS 496032013-12-03T16:22:0003 December 2013 16:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Reactor Building Stack Radiation Monitor Non-Functional Due to Scheduled Maintenance ENS 495452013-11-17T17:55:00017 November 2013 17:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Drywell Sampling Capability ENS 494732013-10-24T17:35:00024 October 2013 17:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Failure of Radwaste Building Effluent Radiation Monitor ENS 493322013-09-09T11:07:0009 September 2013 11:07:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Maintenance on Technical Support Center / Operations Support Center Ventilation ENS 493282013-09-06T13:07:0006 September 2013 13:07:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Radiation Monitoring Sample Rack Declared Non-Functional ENS 493272013-09-06T05:44:0006 September 2013 05:44:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Turbine Building Stack Radiation Monitor Out of Service ENS 493062013-08-24T23:14:00024 August 2013 23:14:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Malfunction of Stack Radiation Monitor Supporting Equipment ENS 492902013-08-19T17:13:00019 August 2013 17:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Increasing Background Noise in Stack Radiation Monitor Renders It Non-Functional ENS 491932013-07-16T11:30:00016 July 2013 11:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Maintenance on Technical Support Center / Operations Support Center Ventilation ENS 490522013-05-19T21:21:00019 May 2013 21:21:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Outage of Radiological and Seismic Monitoring Capability ENS 490312013-05-14T22:02:00014 May 2013 22:02:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Power Outage at Tsc and Osc ENS 489122013-04-10T16:52:00010 April 2013 16:52:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Reactor Building Stack Access Door Not Fully Closed ENS 481702012-08-08T20:50:0008 August 2012 20:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 481012012-07-12T20:15:00012 July 2012 20:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Power Supply Problems to Various Area Rad Monitors ENS 479212012-05-14T10:00:00014 May 2012 10:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out-Of-Service Due to Planned Maintenance ENS 476812012-02-21T08:55:00021 February 2012 08:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Data Processing Network Failure Impacted Emergency Response Data System ENS 474292011-11-10T22:39:00010 November 2011 22:39:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Technical Support Center Emergency Filtration System During Maintenance ENS 474412011-11-05T20:30:0005 November 2011 20:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Major Loss of Emergency Preparedness Capability Due to Network Isolation Device Failure ENS 473432011-10-11T16:50:00011 October 2011 16:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System Inoperable ENS 480052011-09-17T19:00:00017 September 2011 19:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Major Loss of Emergency Assessment Capability Due to Degraded Dose Projection ENS 456712010-02-02T03:13:0002 February 2010 03:13:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Tsc Unavailable for Planned Hvac Maintenance ENS 454872009-11-10T08:00:00010 November 2009 08:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Tsc Due to Planned Mantenance ENS 451112009-06-01T23:50:0001 June 2009 23:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Tsc Air Conditioning Unit Compressor ENS 417372005-05-31T17:00:00031 May 2005 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss and Subsequent Restoration of Emergency Response Data System (Erds) 2020-01-08T02:55:00 | |
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