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South Carolina Electric & Gas Company … South Carolina Electric & Gas Company makes the following notification under 10 CFR 21.21(d)(3)(i) of a defect found during pre-installation testing of a Fairbanks Morse Woodward 2301 A/DRU governor. This governor was not installed on the Virgil C. Summer Nuclear Station Emergency Diesel Generators (EDG).</br>The Fairbanks failure mode effect analysis (FMEA) states that when 125 VDC power is lost to the governor Digital Reference Unit (DRU), the speed reference signal goes to 0 VDC and that the Control Module will respond to drive the EDG to rated speed of 514 rpm. When this failure mode was tested, removal of the 125 VDC power resulted in a speed reference signal of -4 VDC. This would result in the governor Control Module driving the EDG to the low speed set point of 300 rpm. The failure to achieve rated speed would prevent the EDG from performing its safety function.</br>Following a loss of 125 VDC power, the DRU must be manually reset in order for the Control Module to drive the EDG to rated speed. Users of this governor, that are not aware of this failure mode, may be unaware that the in-service EDG would be unable to meet the Technical Specification requirements unless surveillance tests were performed following the loss of power.</br>The licensee will notify the NRC Resident Inspector.censee will notify the NRC Resident Inspector. +
18:25:00, 4 December 2006 +
13:52:00, 5 December 2006 +
18:25:00, 4 December 2006 +
South Carolina Electric & Gas Company … South Carolina Electric & Gas Company makes the following notification under 10 CFR 21.21(d)(3)(i) of a defect found during pre-installation testing of a Fairbanks Morse Woodward 2301 A/DRU governor. This governor was not installed on the Virgil C. Summer Nuclear Station Emergency Diesel Generators (EDG).</br>The Fairbanks failure mode effect analysis (FMEA) states that when 125 VDC power is lost to the governor Digital Reference Unit (DRU), the speed reference signal goes to 0 VDC and that the Control Module will respond to drive the EDG to rated speed of 514 rpm. When this failure mode was tested, removal of the 125 VDC power resulted in a speed reference signal of -4 VDC. This would result in the governor Control Module driving the EDG to the low speed set point of 300 rpm. The failure to achieve rated speed would prevent the EDG from performing its safety function.</br>Following a loss of 125 VDC power, the DRU must be manually reset in order for the Control Module to drive the EDG to rated speed. Users of this governor, that are not aware of this failure mode, may be unaware that the in-service EDG would be unable to meet the Technical Specification requirements unless surveillance tests were performed following the loss of power.</br>The licensee will notify the NRC Resident Inspector.censee will notify 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, 5 December 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>.
02:17:34, 2 March 2018 +
13:52:00, 5 December 2006 +
true +
false +
0.81 d (19.45 hours, 0.116 weeks, 0.0266 months) +
18:25:00, 4 December 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.