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On August 18, 2008, during biennial (i.e., … On August 18, 2008, during biennial (i.e., every two years) non-Technical Specification related testing, Emergency Diesel Generator (EDG) No. 4 failed to start from the EDG local control panel. This occurred with the EDG aligned for Alternate Safe Shutdown (ASSD) response versus its normal alignment. The purpose of the testing is to confirm that the EDG control logic is isolated from the control room and only operable via local controls. Based on troubleshooting activities, it was discovered that this failure to start was due to improper wiring in the circuitry associated with the EDG lockout relay. The improper wiring was introduced by a modification performed on all four EDGs in 2007.</br>At 1110 hours Eastern Daylight Time (EDT) on August 19, 2008, it was concluded that this condition impacted the ability of EDG Nos. 2, 3, and 4 to perform their intended ASSD function. The 2007, modification affected the termination point for the power to the EDG lockout relay reset coil. Per the modification, this termination point was incorrectly connected to the downstream side of the alternate shutdown isolation switch which results in a loss of power to the lockout reset when the switch is placed in local control. Therefore, in the unlikely event of a fire, an induced failure could potentially initiate a lockout signal which could not be reset from the EDG local control panel. Although the modification was installed on all four EDGs, only the local control of EDGs 2, 3, and 4 is credited in the safe shutdown analysis.</br>This condition does not affect the Technical Specification operability of the EDGs and they remain fully capable of performing their intended design basis accident response functions.</br>The NRC Resident Inspector has been notified.</br>Compensatory fire watches have been established and an engineering change package to correct the condition is being developed. correct the condition is being developed. +
15:10:00, 19 August 2008 +
44,425 +
17:27:00, 19 August 2008 +
15:10:00, 19 August 2008 +
On August 18, 2008, during biennial (i.e., … On August 18, 2008, during biennial (i.e., every two years) non-Technical Specification related testing, Emergency Diesel Generator (EDG) No. 4 failed to start from the EDG local control panel. This occurred with the EDG aligned for Alternate Safe Shutdown (ASSD) response versus its normal alignment. The purpose of the testing is to confirm that the EDG control logic is isolated from the control room and only operable via local controls. Based on troubleshooting activities, it was discovered that this failure to start was due to improper wiring in the circuitry associated with the EDG lockout relay. The improper wiring was introduced by a modification performed on all four EDGs in 2007.</br>At 1110 hours Eastern Daylight Time (EDT) on August 19, 2008, it was concluded that this condition impacted the ability of EDG Nos. 2, 3, and 4 to perform their intended ASSD function. The 2007, modification affected the termination point for the power to the EDG lockout relay reset coil. Per the modification, this termination point was incorrectly connected to the downstream side of the alternate shutdown isolation switch which results in a loss of power to the lockout reset when the switch is placed in local control. Therefore, in the unlikely event of a fire, an induced failure could potentially initiate a lockout signal which could not be reset from the EDG local control panel. Although the modification was installed on all four EDGs, only the local control of EDGs 2, 3, and 4 is credited in the safe shutdown analysis.</br>This condition does not affect the Technical Specification operability of the EDGs and they remain fully capable of performing their intended design basis accident response functions.</br>The NRC Resident Inspector has been notified.</br>Compensatory fire watches have been established and an engineering change package to correct the condition is being developed. correct the condition is being developed. +
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, 19 August 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>.
02:13:50, 2 March 2018 +
17:27:00, 19 August 2008 +
true +
false +
0.095 d (2.28 hours, 0.0136 weeks, 0.00312 months) +
15:10:00, 19 August 2008 +
Alternate Safe Shutdown Local Start Capability of All Four Emergency Diesel Generators May Not Be Available Under Certain Conditions +
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