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This report is made in compliance with Tec … This report is made in compliance with Tech spec 2.7, 4 hour NRC notification of inoperable house service transformers. The 161 Kv electrical supply to both house service transformers T1A-3 and T1A-4 was lost at 21:03 EDT. Fast transfer to 22 Kv was successful. AOP-31, 161 Kv Grid Malfunctions, abnormal operating procedure was entered. Technical Specification 2.7 (2) c, 72 hour LCO was entered.</br>Background: The site was in a tornado warning between 20:30 and 21:00 EDT. Wind speeds were observed in excess of 60 mph by the site weather tower. One of the two switchyard breakers 3451-5 on the 345 Kv system opened at 20:50 EDT. The 345 Kv output breaker 3451-4 remained closed.</br>The EDG are in standby and ready for service if required.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE ON 08/21/07 AT 0400 EDT FROM K. BOSTON TO MACKINNON * * *</br>The 161Kv electrical supply has been returned to service and Tech Spec 2.7(2)c has been exited at 0029 EDT on 08/21/07. Breaker 3451-5 remains open. System walk downs have to be completed before breaker 3451-5 can be closed. R4DO (J. Clark) notified. </br>The NRC Resident Inspector is presently in the control room.nspector is presently in the control room. +
02:03:00, 21 August 2007 +
43,582 +
22:06:00, 20 August 2007 +
02:03:00, 21 August 2007 +
This report is made in compliance with Tec … This report is made in compliance with Tech spec 2.7, 4 hour NRC notification of inoperable house service transformers. The 161 Kv electrical supply to both house service transformers T1A-3 and T1A-4 was lost at 21:03 EDT. Fast transfer to 22 Kv was successful. AOP-31, 161 Kv Grid Malfunctions, abnormal operating procedure was entered. Technical Specification 2.7 (2) c, 72 hour LCO was entered.</br>Background: The site was in a tornado warning between 20:30 and 21:00 EDT. Wind speeds were observed in excess of 60 mph by the site weather tower. One of the two switchyard breakers 3451-5 on the 345 Kv system opened at 20:50 EDT. The 345 Kv output breaker 3451-4 remained closed.</br>The EDG are in standby and ready for service if required.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE ON 08/21/07 AT 0400 EDT FROM K. BOSTON TO MACKINNON * * *</br>The 161Kv electrical supply has been returned to service and Tech Spec 2.7(2)c has been exited at 0029 EDT on 08/21/07. Breaker 3451-5 remains open. System walk downs have to be completed before breaker 3451-5 can be closed. R4DO (J. Clark) notified. </br>The NRC Resident Inspector is presently in the control room.nspector is presently in the control room. +
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100 +
00:00:00, 21 August 2007 +
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>.
22:36:15, 24 September 2017 +
22:06:00, 20 August 2007 +
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false +
-0.165 d (-3.95 hours, -0.0235 weeks, -0.00541 months) +
02:03:00, 21 August 2007 +
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.