ENS 45280
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ENS Event | |
|---|---|
20:43 Aug 20, 2009 | |
| Title | Loss of Plant Integrated Computer System Resulting in Loss of Erds and Spds |
| Event Description | At 0950 the Plant Integrated Computer System started to fail as indicated by a loss of computer link to Generation. Investigation by computer maintenance personnel was initiated. The failure mode of the computer precluded accessing screens to allow use of Safety Parameter Display System (SPDS) and Emergency Response Data System (ERDS). Computer core thermal power indication remained available to the control room operators. Redundant, normal control room indications are still available to the operators. At 1217 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.630685e-4 months <br /> on 08/20/09, a planned loss of computer core thermal power indication occurred due to ongoing computer maintenance activities.
At 1458 hours0.0169 days <br />0.405 hours <br />0.00241 weeks <br />5.54769e-4 months <br /> on 08/20/09, the Plant Integrated Computer System was fully restored to service, including the Safety Parameter Display System (SPDS) and Emergency Response Data System (ERDS) functions. At 1643 hours0.019 days <br />0.456 hours <br />0.00272 weeks <br />6.251615e-4 months <br /> on 08/20/09, the Plant Integrated Computer System started to fail again as indicated by loss of computer link to Generation. This problem with the computer again precluded accessing Safety Parameter Display System (SPDS) and Emergency Response Data System (ERDS). Core thermal power indication remained available via the plant computer system. However, anticipated troubleshooting actions will require a reduction in power by approximately 0.25-0.33% by reducing core flow. Due to the cumulative impacts of the loss of the plant computer system, this notification is being communicated ahead of the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> unavailability of the Unit 2 SPDS and ERDS computer system. This is considered a Loss of Emergency Assessment Capability and therefore reportable under 10CFR50.72(b)(3)(xiii). The licensee notified the NRC Resident Inspector.
As of 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br />, Unit 2 ERDS and SPDS (Safety Parameter Display System) were restored to normal operation. The licensee has notified the NRC Resident Inspector. Notified R1DO (White). |
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-0.48 h-0.02 days <br />-0.00286 weeks <br />-6.57504e-4 months <br />) | |
| Opened: | Dave Borger 20:14 Aug 20, 2009 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Aug 25, 2009 |
| 45280 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (94 %) |
| After | Power Operation (94 %) |
WEEKMONTHYEARENS 497532014-01-21T18:40:00021 January 2014 18:40:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Vent Stack Radiation Monitors Out of Service ENS 482112012-08-20T15:06:00020 August 2012 15:06:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Data System ENS 480202012-06-13T04:00:00013 June 2012 04:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Safety Parameters Display System Out of Service ENS 478202012-04-11T01:48:00011 April 2012 01:48:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Spds and Erds Removed from Service Due to Planned Maintenance ENS 473722011-10-24T21:15:00024 October 2011 21:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operation Facility Out of Service Due to Planned Maintenance Activity ENS 453362009-09-09T13:30:0009 September 2009 13:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Sirens Out of Service ENS 452802009-08-20T20:43:00020 August 2009 20:43:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Plant Integrated Computer System Resulting in Loss of Erds and Spds ENS 452702009-08-17T16:10:00017 August 2009 16:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Data System and Safety Parameter Display System Due to Computer Problems ENS 445132008-09-23T11:30:00023 September 2008 11:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operating Facility Unavailable ENS 443422008-07-10T19:38:00010 July 2008 19:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capabilities Due to Plant Computer Failure ENS 440872008-03-22T14:35:00022 March 2008 14:35:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Spds/Erds Computer System Greater than 8 Hours ENS 440702008-03-17T15:50:00017 March 2008 15:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Safety Parameter Display System (Spds) and Emergency Response Data System (Erds) Unavailable Due to Planned Maintenance ENS 432392007-03-15T03:00:00015 March 2007 03:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Outage of Spds and Erds ENS 432282007-03-10T05:30:00010 March 2007 05:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Maintenance for Unit 2 Spds and Erds System ENS 424232006-03-15T10:57:00015 March 2006 10:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability - Safety Parameter Display System ENS 422902006-01-27T13:00:00027 January 2006 13:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Unit 2 Emergency Response Data System (Erds) Modem Failed ENS 421832005-12-02T05:49:0002 December 2005 05:49:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Safety Parameter Display System (Spds) Failure on Unit Two ENS 420812005-10-26T14:20:00026 October 2005 14:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Power at the Emergency Operations Facility ENS 416402005-04-26T11:31:00026 April 2005 11:31:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Spds (Safety Parameter Display System) Is Down for Planned Maintenance ENS 416312005-04-25T02:30:00025 April 2005 02:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Spds (Safety Parameter Display System) Is Down for Planned Maintenance ENS 410292004-09-09T08:24:0009 September 2004 08:24:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Assessment Capability ENS 409562004-08-15T00:45:00015 August 2004 00:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Safety Parameter Display System ENS 409482004-08-13T12:00:00013 August 2004 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of the Safety Parameter Display System (Spds) for Greater than 8 Hours ENS 405732004-03-07T03:10:0007 March 2004 03:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Spds Will Be De-Energized for More than 8 Hours Due to Refueling Outage Activities ENS 401822003-09-19T20:00:00019 September 2003 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Sirens Due to Storm 2014-01-21T18:40:00 | |
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