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At 1345 Prairie Island staff declared both … At 1345 Prairie Island staff declared both trains of Unit 2 Component Cooling (CC) system inoperable due to discovery that a postulated high energy line break (HELB) in the Turbine Building that could fail a CC line in the turbine building that would affect both trains of CC. The inoperability of Unit 2 CC caused entry into Technical Specification LCO 3.0.3. The CC line in question is not automatically isolated on a safety injection signal and the loss of CC inventory would eventually affect both trains of CC. Since a Unit 2 HELB could directly result in a loss of both trains of CC (a system that is required to meet the single failure criterion), the CC system does not meet the single failure criterion in the as-found configuration. Thus, in accordance with the guidance in NUREG 1022, this condition is reportable per 10 CFR 50.72(b)(3)(ii).</br>The CC line in the Turbine Building was isolated at 1614 on 7/31/08 returning Unit 2 CC to operable status. Unit 2 remained at 100% power.</br>The isolated line went to a chemistry lab cooler that can be isolated during operation. The condition was discovered during a high-energy line break vulnerability walk-down. A similar line on Unit 1 was already isolated.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
18:45:00, 31 July 2008 +
44,379 +
21:59:00, 31 July 2008 +
18:45:00, 31 July 2008 +
At 1345 Prairie Island staff declared both … At 1345 Prairie Island staff declared both trains of Unit 2 Component Cooling (CC) system inoperable due to discovery that a postulated high energy line break (HELB) in the Turbine Building that could fail a CC line in the turbine building that would affect both trains of CC. The inoperability of Unit 2 CC caused entry into Technical Specification LCO 3.0.3. The CC line in question is not automatically isolated on a safety injection signal and the loss of CC inventory would eventually affect both trains of CC. Since a Unit 2 HELB could directly result in a loss of both trains of CC (a system that is required to meet the single failure criterion), the CC system does not meet the single failure criterion in the as-found configuration. Thus, in accordance with the guidance in NUREG 1022, this condition is reportable per 10 CFR 50.72(b)(3)(ii).</br>The CC line in the Turbine Building was isolated at 1614 on 7/31/08 returning Unit 2 CC to operable status. Unit 2 remained at 100% power.</br>The isolated line went to a chemistry lab cooler that can be isolated during operation. The condition was discovered during a high-energy line break vulnerability walk-down. A similar line on Unit 1 was already isolated.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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100 +
00:00:00, 31 July 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>.
02:13:59, 2 March 2018 +
21:59:00, 31 July 2008 +
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0.135 d (3.23 hours, 0.0192 weeks, 0.00442 months) +
18:45:00, 31 July 2008 +
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