Browse wiki
Jump to navigation
Jump to search
92 +
At 0806 EDT, a loss of offsite power occur … At 0806 EDT, a loss of offsite power occurred when the 115 KV line #4 was lost combined with the unavailability of 115 KV line #1 which was out of service at the time for planned maintenance. Both EDGs started and loaded on the safety busses as expected. The licensee declared an Unusual Event at 0825 EDT per EAL 6.1.1 based on loss of offsite power for greater than 15 minutes. </br>The Unit 1 recirc pump #13 tripped as a result of the event and spent fuel pool cooling was also lost. The licensee remained at power and there was no impact on Nine Mile Unit 2.</br>Power for 115 KV line #1 was restored at 0845 EDT. Cause of the loss of Line #4 is still under investigation. </br>The reactor is stable and the safety busses continue to be power by the EDGs. Restoration of a normal electrical power lineup and termination of the UE is still under review.</br>The licensee notified the NRC Resident Inspector, the State, and local authorities.</br>* * * UPDATE AT 10:29 EDT ON 5/13/08 FROM HELKER TO HUFFMAN * * *</br>The licensee terminated the Unusual Event at 10:22 EDT based on restoration of offsite power to safety bus 103 from line #1. Bus 102 still remains energized by the EDG at this time. Investigation into the loss of line #4 continues. The loss of line #4 has been attributed to a Fitzpatrick protective relay 87B actuation for the B phase differential current. Investigation continues.</br>The NRC Resident has been notified by the licensee. </br>NRR EO (Thorp), Rg 1 (Dentel), IRD (McDermott), R1DO (Krohn), DHS (Dwight) and FEMA (McKentry) notified.</br>* * * UPDATE AT 12:53 EDT ON 5/13/08 FROM HELKER TO SNYDER * * * </br>This condition is also reportable under 10 CFR 50.72(b)(3)(v)(D) 'Any event or condition that at the time of discovery could have prevented fulfillment of a safety function of systems that are needed to mitigate the consequences of an accident.' Specifically, both offsite power 115 KV lines were not available.</br>The second paragraph which applies is 10 CFR 50.72(b)(3)(iv)(B) 'Any event or condition that results in the valid actuation of the systems listed in paragraph (b)(3)(iv)(B).' Specifically, the auto start of the Emergency Diesel Generators on a valid loss of offsite power signal.</br>The cause of the loss of line 4 is still being investigated. Offsite power has been restored to onsite buses including PB 102, 103 and 101.</br>The licensee will notify the NRC Resident Inspector of this update.</br>Notified R1DO (Krohn).tor of this update.
Notified R1DO (Krohn).
12:25:00, 13 May 2008 +
44,206 +
08:59:00, 13 May 2008 +
12:25:00, 13 May 2008 +
At 0806 EDT, a loss of offsite power occur … At 0806 EDT, a loss of offsite power occurred when the 115 KV line #4 was lost combined with the unavailability of 115 KV line #1 which was out of service at the time for planned maintenance. Both EDGs started and loaded on the safety busses as expected. The licensee declared an Unusual Event at 0825 EDT per EAL 6.1.1 based on loss of offsite power for greater than 15 minutes. </br>The Unit 1 recirc pump #13 tripped as a result of the event and spent fuel pool cooling was also lost. The licensee remained at power and there was no impact on Nine Mile Unit 2.</br>Power for 115 KV line #1 was restored at 0845 EDT. Cause of the loss of Line #4 is still under investigation. </br>The reactor is stable and the safety busses continue to be power by the EDGs. Restoration of a normal electrical power lineup and termination of the UE is still under review.</br>The licensee notified the NRC Resident Inspector, the State, and local authorities.</br>* * * UPDATE AT 10:29 EDT ON 5/13/08 FROM HELKER TO HUFFMAN * * *</br>The licensee terminated the Unusual Event at 10:22 EDT based on restoration of offsite power to safety bus 103 from line #1. Bus 102 still remains energized by the EDG at this time. Investigation into the loss of line #4 continues. The loss of line #4 has been attributed to a Fitzpatrick protective relay 87B actuation for the B phase differential current. Investigation continues.</br>The NRC Resident has been notified by the licensee. </br>NRR EO (Thorp), Rg 1 (Dentel), IRD (McDermott), R1DO (Krohn), DHS (Dwight) and FEMA (McKentry) notified.</br>* * * UPDATE AT 12:53 EDT ON 5/13/08 FROM HELKER TO SNYDER * * * </br>This condition is also reportable under 10 CFR 50.72(b)(3)(v)(D) 'Any event or condition that at the time of discovery could have prevented fulfillment of a safety function of systems that are needed to mitigate the consequences of an accident.' Specifically, both offsite power 115 KV lines were not available.</br>The second paragraph which applies is 10 CFR 50.72(b)(3)(iv)(B) 'Any event or condition that results in the valid actuation of the systems listed in paragraph (b)(3)(iv)(B).' Specifically, the auto start of the Emergency Diesel Generators on a valid loss of offsite power signal.</br>The cause of the loss of line 4 is still being investigated. Offsite power has been restored to onsite buses including PB 102, 103 and 101.</br>The licensee will notify the NRC Resident Inspector of this update.</br>Notified R1DO (Krohn).tor of this update.
Notified R1DO (Krohn).
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, 13 May 2008 +
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>.
02:14:25, 2 March 2018 +
08:59:00, 13 May 2008 +
true +
false +
-0.143 d (-3.43 hours, -0.0204 weeks, -0.0047 months) +
12:25:00, 13 May 2008 +
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.