Browse wiki
Jump to navigation
Jump to search
100 +
Event reportability is in accordance with … Event reportability is in accordance with 10 CFR 50.72(b)(3)(v)(D), 'Accident Mitigation,' and 10 CFR 50.72(b)(2)(i), 'TS Required Shutdown,' due to potential COMMON CAUSE FAILURE of all four Emergency Diesel Generators. On 05 August 2005, at 14:31 hrs, DG2 was started for data gathering purposes, and it experienced a trip and lockout on differential current. Investigation revealed that set points for the installed DG differential current protective devices may be set too conservatively. Since each DG has the same relay with the same set point, all DGs were declared inoperable. Preparations are in progress to place both units in Cold Shutdown.</br>The site has insufficient operable backup AC sources. The current effect on the plant is minimal due to all normal AC sources being available and operable. However, due to the potential for losing a normal AC source resulting in insufficient power being available to some emergency systems, both units will be placed in cold shutdown until all emergency diesel generators can be restored to operable.</br>Corrective actions are in progress to correct differential current protective device problem in order to restore availability of DG2 and operability of all four DGs.</br>The licensee plans on commencing a down power on both units (Unit 2 first) within several hours. Technical Specifications require both units to be in Hot Shutdown within 12 hours (approximately 0700 on 08/06/05) and Cold Shutdown within 36 hours. Neither unit has any other significant systems LCOs.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM LICENSEE (BAIN) TO NRC (HUFFMAN) AT 10:38 EDT ON 8/06/05 * * * </br>This is a follow up message to the initial event reported in accordance with 10 CFR 50.72(b)(3)(v)(D), 'Accident Mitigation' and 10 CFR 50.72(b)(2)(i), 'TS Required Shutdown' due to the potential COMMON CAUSE FAILURE of all four Emergency Diesel Generators. Unit 2 entered Mode 3 (Hot Shutdown) at 04:46. Unit 1 entered Mode 3 (Hot Shutdown) at 05:31. Both units are continuing to cool down in preparation for entering Mode 4 (Cold Shutdown)." The licensee notified the NRC Resident Inspector. </br>Notified R2DO(Landis), NRR EO (Haney), and IRD (McGinty).andis), NRR EO (Haney), and IRD (McGinty).
22:40:00, 5 August 2005 +
41,895 +
21:24:00, 5 August 2005 +
22:40:00, 5 August 2005 +
Event reportability is in accordance with … Event reportability is in accordance with 10 CFR 50.72(b)(3)(v)(D), 'Accident Mitigation,' and 10 CFR 50.72(b)(2)(i), 'TS Required Shutdown,' due to potential COMMON CAUSE FAILURE of all four Emergency Diesel Generators. On 05 August 2005, at 14:31 hrs, DG2 was started for data gathering purposes, and it experienced a trip and lockout on differential current. Investigation revealed that set points for the installed DG differential current protective devices may be set too conservatively. Since each DG has the same relay with the same set point, all DGs were declared inoperable. Preparations are in progress to place both units in Cold Shutdown.</br>The site has insufficient operable backup AC sources. The current effect on the plant is minimal due to all normal AC sources being available and operable. However, due to the potential for losing a normal AC source resulting in insufficient power being available to some emergency systems, both units will be placed in cold shutdown until all emergency diesel generators can be restored to operable.</br>Corrective actions are in progress to correct differential current protective device problem in order to restore availability of DG2 and operability of all four DGs.</br>The licensee plans on commencing a down power on both units (Unit 2 first) within several hours. Technical Specifications require both units to be in Hot Shutdown within 12 hours (approximately 0700 on 08/06/05) and Cold Shutdown within 36 hours. Neither unit has any other significant systems LCOs.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM LICENSEE (BAIN) TO NRC (HUFFMAN) AT 10:38 EDT ON 8/06/05 * * * </br>This is a follow up message to the initial event reported in accordance with 10 CFR 50.72(b)(3)(v)(D), 'Accident Mitigation' and 10 CFR 50.72(b)(2)(i), 'TS Required Shutdown' due to the potential COMMON CAUSE FAILURE of all four Emergency Diesel Generators. Unit 2 entered Mode 3 (Hot Shutdown) at 04:46. Unit 1 entered Mode 3 (Hot Shutdown) at 05:31. Both units are continuing to cool down in preparation for entering Mode 4 (Cold Shutdown)." The licensee notified the NRC Resident Inspector. </br>Notified R2DO(Landis), NRR EO (Haney), and IRD (McGinty).andis), NRR EO (Haney), and IRD (McGinty).
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 August 2005 +
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>.
02:20:29, 2 March 2018 +
21:24:00, 5 August 2005 +
true +
false +
-0.0529 d (-1.27 hours, -0.00756 weeks, -0.00174 months) +
22:40:00, 5 August 2005 +
Technical Specification Required Shutdown Due to Inoperability of All Emergency Diesel Generators +
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.