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This 60-day optional report, as allowed by … This 60-day optional report, as allowed by 10 CFR 50.73(a)(1), is being made under the reporting requirement in 10CFR50.73(a)(2)(iv)(A) to describe an unplanned, invalid actuation of specified systems, specifically the Units 2 and 3 Primary Containment Isolation Systems (PCIS).</br>On 4/25/04, at approximately 0105 hours, the 343SU startup source tripped resulting in a fast transfer of expected 4 kV emergency busses to the alternate offsite power source. The fast transfer resulted in a half PCIS Group II isolation on both Units 2 and 3 as expected. The half isolation of PCIS Group II resulted in outboard isolation valves closing on Unit 2 and inboard isolation valves closing on Unit 3. The isolations involved various PCIS Group II process lines such as Reactor Water Cleanup (RWCU), Containment Atmospheric Control (CAC) / Containment Atmospheric Dilution (CAD) and Containment Instrument Nitrogen. The Units 2 and 3 PCIS isolations were reset by approximately 0130 hours in accordance with procedures. All required isolation valves operated as designed.</br>The offsite source (343SU) was lost as a result of a ground fault. Subsequent investigation determined that a raccoon had climbed a takeoff tower where the startup source transitions from an aerial line to underground cabling. The associated equipment was located in a small fenced area near the plant. The offsite source was inspected, tested and returned to an operable condition by approximately 2220 hours on 4/25/04. This issue has been entered into the site Corrective Action Program (CR 216811) for evaluation and implementation of further corrective actions.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
05:05:00, 25 April 2004 +
09:14:00, 15 June 2004 +
05:05:00, 25 April 2004 +
This 60-day optional report, as allowed by … This 60-day optional report, as allowed by 10 CFR 50.73(a)(1), is being made under the reporting requirement in 10CFR50.73(a)(2)(iv)(A) to describe an unplanned, invalid actuation of specified systems, specifically the Units 2 and 3 Primary Containment Isolation Systems (PCIS).</br>On 4/25/04, at approximately 0105 hours, the 343SU startup source tripped resulting in a fast transfer of expected 4 kV emergency busses to the alternate offsite power source. The fast transfer resulted in a half PCIS Group II isolation on both Units 2 and 3 as expected. The half isolation of PCIS Group II resulted in outboard isolation valves closing on Unit 2 and inboard isolation valves closing on Unit 3. The isolations involved various PCIS Group II process lines such as Reactor Water Cleanup (RWCU), Containment Atmospheric Control (CAC) / Containment Atmospheric Dilution (CAD) and Containment Instrument Nitrogen. The Units 2 and 3 PCIS isolations were reset by approximately 0130 hours in accordance with procedures. All required isolation valves operated as designed.</br>The offsite source (343SU) was lost as a result of a ground fault. Subsequent investigation determined that a raccoon had climbed a takeoff tower where the startup source transitions from an aerial line to underground cabling. The associated equipment was located in a small fenced area near the plant. The offsite source was inspected, tested and returned to an operable condition by approximately 2220 hours on 4/25/04. This issue has been entered into the site Corrective Action Program (CR 216811) for evaluation and implementation of further corrective actions.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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100 +
00:00:00, 15 June 2004 +
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>.
22:43:05, 24 September 2017 +
09:14:00, 15 June 2004 +
true +
false +
51.173 d (1,228.15 hours, 7.31 weeks, 1.682 months) +
05:05:00, 25 April 2004 +
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.