Browse wiki
Jump to navigation
Jump to search
100 +
This 60-day ENS report is being made per 1 … This 60-day ENS report is being made per 10CFR 50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1) to report an invalid automatic actuation of systems listed in paragraph (a)(2)(iv)(B), namely emergency service water (ESW).</br>On Sunday July 9, 2006, at 18:49 hours, an invalid actuation of the B ESW pump occurred. The B ESW loop start was a partial actuation and the loop functioned successfully following the invalid actuation. The A ESW loop was not affected.</br>An investigation identified that corrosion on the D12 emergency diesel generator (EDG) jacket water pump discharge pressure switch caused the invalid partial actuation. The cause of the pressure switch failure was due to a cracked supply tube, which allowed moisture to enter the cabinet causing the corrosion. EDG jacket water pump discharge pressure is utilized to initiate logic that starts the ESW pump when the EDG is running. ESW is the cooling medium for the EDG. The switch failure also caused inoperability of D12 EDG since it defeated the capability for the EDG to start. The failed pressure switch and associated tubing were replaced and successfully tested. D12 EDG was declared operable on Monday July 10, 2006 at 12:46 hours.</br>An inspection of the other seven EDGs identified that the D11 EDG pressure switch was also corroded. The D11 EDG pressure switch was replaced. The inspection determined that the jacket water pressure switches on the other six EDGs were not degraded.</br>This event is reportable per 10CFR50.73(a)(2)(iv)(A) since B ESW pump automatically actuated on an invalid signal.</br>Component data:</br>Equipment number: PSH-GA-110B</br>Manufacturer: A160 Allen-Bradley Co.</br>Model number: 636-C3</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
22:49:00, 9 July 2006 +
42,830 +
16:23:00, 6 September 2006 +
22:49:00, 9 July 2006 +
This 60-day ENS report is being made per 1 … This 60-day ENS report is being made per 10CFR 50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1) to report an invalid automatic actuation of systems listed in paragraph (a)(2)(iv)(B), namely emergency service water (ESW).</br>On Sunday July 9, 2006, at 18:49 hours, an invalid actuation of the B ESW pump occurred. The B ESW loop start was a partial actuation and the loop functioned successfully following the invalid actuation. The A ESW loop was not affected.</br>An investigation identified that corrosion on the D12 emergency diesel generator (EDG) jacket water pump discharge pressure switch caused the invalid partial actuation. The cause of the pressure switch failure was due to a cracked supply tube, which allowed moisture to enter the cabinet causing the corrosion. EDG jacket water pump discharge pressure is utilized to initiate logic that starts the ESW pump when the EDG is running. ESW is the cooling medium for the EDG. The switch failure also caused inoperability of D12 EDG since it defeated the capability for the EDG to start. The failed pressure switch and associated tubing were replaced and successfully tested. D12 EDG was declared operable on Monday July 10, 2006 at 12:46 hours.</br>An inspection of the other seven EDGs identified that the D11 EDG pressure switch was also corroded. The D11 EDG pressure switch was replaced. The inspection determined that the jacket water pressure switches on the other six EDGs were not degraded.</br>This event is reportable per 10CFR50.73(a)(2)(iv)(A) since B ESW pump automatically actuated on an invalid signal.</br>Component data:</br>Equipment number: PSH-GA-110B</br>Manufacturer: A160 Allen-Bradley Co.</br>Model number: 636-C3</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
100 +
00:00:00, 6 September 2006 +
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>.
02:18:06, 2 March 2018 +
16:23:00, 6 September 2006 +
true +
false +
58.732 d (1,409.57 hours, 8.39 weeks, 1.931 months) +
22:49:00, 9 July 2006 +
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.