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At 0950 the Plant Integrated Computer Syst … 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 hours on 08/20/09, a planned loss of computer core thermal power indication occurred due to ongoing computer maintenance activities.</br>At 1458 hours 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 hours 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.</br>Due to the cumulative impacts of the loss of the plant computer system, this notification is being communicated ahead of the 8 hour 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).</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM RICHARD KLINEFELTER TO CHARLES TEAL AT 1222 EDT ON 8/25/2009 * * * </br>As of 1200 hours, Unit 2 ERDS and SPDS (Safety Parameter Display System) were restored to normal operation.</br>The licensee has notified the NRC Resident Inspector. Notified R1DO (White).esident Inspector. Notified R1DO (White). +
20:43:00, 20 August 2009 +
45,280 +
20:14:00, 20 August 2009 +
20:43:00, 20 August 2009 +
At 0950 the Plant Integrated Computer Syst … 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 hours on 08/20/09, a planned loss of computer core thermal power indication occurred due to ongoing computer maintenance activities.</br>At 1458 hours 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 hours 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.</br>Due to the cumulative impacts of the loss of the plant computer system, this notification is being communicated ahead of the 8 hour 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).</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM RICHARD KLINEFELTER TO CHARLES TEAL AT 1222 EDT ON 8/25/2009 * * * </br>As of 1200 hours, Unit 2 ERDS and SPDS (Safety Parameter Display System) were restored to normal operation.</br>The licensee has notified the NRC Resident Inspector. Notified R1DO (White).esident Inspector. Notified R1DO (White). +
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94 +
00:00:00, 25 August 2009 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
02:11:26, 2 March 2018 +
20:14:00, 20 August 2009 +
true +
false +
-0.02 d (-0.48 hours, -0.00286 weeks, -6.57504e-4 months) +
20:43:00, 20 August 2009 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.