ENS 51717
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ENS Event | |
|---|---|
14:12 Feb 9, 2016 | |
| Title | Planned Maintenance of the Plant Computer System |
| Event Description | Planned maintenance of the Plant Computer System (PCS) will cause a loss of emergency assessment capability.
Beginning February 9, 2016, PCS data will not be available to the following Comanche Peak Nuclear Power Plant (CPNPP) facilities due to planned PCS software modifications: -Emergency Operations Facility [EOF] -Backup EOF -Operations Support Center The Emergency Response Data System [ERDS] will also be unavailable. The planned maintenance of the PCS is being reported as a loss of assessment capability in accordance with 10 CFR 50.72(b)(3)(xiii) because the duration is expected to be more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> and the data to the Backup EOF is also affected. CPNPP has compensatory measures in place to ensure timely emergency classification, protective action recommendation and emergency notification, as needed. The PCS modification is expected to be complete by February 18, 2016. A follow-up ENS [Emergency Notification System] communication will be made when the EOF assessment capability is restored. The Licensee has notified the NRC Resident Inspector.
The planned maintenance of the Comanche Peak Plant Computer System (PCS) that began on February 9, 2016 is complete. Assessment capability in the following facilities was restored effective 1300 [CST] February 18, 2016: -Emergency Operations Facility (EOF) -Backup EOF -Operations Support Center The Emergency Response Data System availability has also been restored. The Licensee has notified the NRC Resident Inspector. Notified the R4DO(Werner). |
| Where | |
|---|---|
Comanche Peak  Texas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-4.3 h-0.179 days <br />-0.0256 weeks <br />-0.00589 months <br />) | |
| Opened: | John Rasmussen 09:54 Feb 9, 2016 |
| NRC Officer: | Steven Vitto |
| Last Updated: | Feb 18, 2016 |
| 51717 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 574772024-12-18T20:30:00018 December 2024 20:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Emergency Notification System Capability ENS 556942022-01-07T07:20:0007 January 2022 07:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Meteorological Emergency Assessment Capability ENS 553052021-06-13T03:27:00013 June 2021 03:27:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line (Msl) Radiation Monitor Non-Functional ENS 553042021-06-12T22:25:00012 June 2021 22:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line (Msl) Radiation Monitor Non-Functional ENS 549292020-09-30T13:15:00030 September 2020 13:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitors Required for Event Assessment Out of Service for Planned Maintenance ENS 544332019-12-10T15:20:00010 December 2019 15:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Loss of Emergency Response Facilities and Equipment ENS 544302019-12-10T03:26:00010 December 2019 03:26:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line (Msl) Radiation Monitor to Be Non-Functional ENS 543672019-11-03T14:00:0003 November 2019 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness En Revision Imported Date 12/11/2019 ENS 543292019-10-14T14:11:00014 October 2019 14:11:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line (Msl) Radiation Monitor Removed from Service for Planned Maintenance ENS 534722018-06-26T05:00:00026 June 2018 05:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line Radiation Monitor Determined to Be Non-Functional ENS 534232018-05-23T13:48:00023 May 2018 13:48:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 533802018-05-03T17:20:0003 May 2018 17:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 532122018-02-15T09:06:00015 February 2018 09:06:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line Radiation Monitor Determined to Be Non Functional ENS 531542018-01-06T17:26:0006 January 2018 17:26:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line Radiation Monitor Determined to Be Non-Functional ENS 531432018-01-02T17:37:0002 January 2018 17:37:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unplanned Loss of Emergency Response Equipment Due to Loss of Plant Computer ENS 531052017-12-06T02:00:0006 December 2017 02:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unplanned Loss of Multiple Radiation Monitors During Maintenance ENS 529372017-08-30T07:10:00030 August 2017 07:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unplanned Loss of Emergency Response Equipment ENS 523632016-11-13T16:12:00013 November 2016 16:12:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness One Main Steam Line Radiation Monitor Failed ENS 519552016-05-24T15:22:00024 May 2016 15:22:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unplanned Loss of Emergency Assessment Capability ENS 518712016-04-19T18:43:00019 April 2016 18:43:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Main Steam Line Radiation Detector Determined to Be Non Functional ENS 517172016-02-09T14:12:0009 February 2016 14:12:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance of the Plant Computer System ENS 516392016-01-07T13:59:0007 January 2016 13:59:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Both Meteorological Towers Due to Power System Failure ENS 509652015-04-07T16:00:0007 April 2015 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Inoperable Seismic Instrumentation Identified During Historical Review ENS 509552015-04-05T13:52:0005 April 2015 13:52:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Both Primary and Backup Meteorological Towers Due to Partial Loss of 25Kv Power Distribution ENS 507732015-01-28T16:18:00028 January 2015 16:18:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Unavailable Due to Planned Ventilation Maintenance ENS 507152015-01-03T11:38:0003 January 2015 11:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Meteorological Emergency Assessment Capability ENS 507132015-01-02T09:14:0002 January 2015 09:14:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Meteorological Emergency Assessment Capability ENS 503502014-08-07T14:25:0007 August 2014 14:25:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Air Conditioning Operating at Reduced Capacity ENS 489532013-04-22T14:00:00022 April 2013 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Not Available ENS 483522012-09-27T17:54:00027 September 2012 17:54:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Emergency Assessment During Planned Modifications ENS 483182012-09-18T15:55:00018 September 2012 15:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Outage of Plant Radiation Monitoring System Remote Readout Due to Planned Modification ENS 482472012-08-29T13:57:00029 August 2012 13:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Plant Radiation Monitoring System Remote Readout ENS 447642009-01-13T08:19:00013 January 2009 08:19:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communications Capability Due to a Fiber Optic Cable Cut ENS 442822008-06-10T15:11:00010 June 2008 15:11:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of the Safety Parameter Display System ENS 441912008-05-07T16:00:0007 May 2008 16:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Multiplexer Power Supply ENS 422042005-12-13T19:45:00013 December 2005 19:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Offsite Notification ENS 408842004-07-20T20:39:00020 July 2004 20:39:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability Exceeding 8 Hours 2024-12-18T20:30:00 [Table view] | |
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