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At 1629 EDT on August 25, 2016, it was det … At 1629 EDT on August 25, 2016, it was determined that a Mechanical Draft Cooling Tower (MDCT) fan should be declared inoperable if its associated fan brake is nonfunctional. The MDCT fan brake is required to prevent fan over speed from a design basis tornado. The MDCT fans are required to support the operability of the Ultimate Heat Sink (UHS). Currently, the MDCT fans and fan brakes are operable. A past operability evaluation is being performed and has initially identified that from 0855 EDT to 1738 EDT on April 6, 2016, the Division 1 'A' fan brake was nonfunctional due to a nitrogen bottle being below the required pressure. Additionally, from 0856 EDT on April 6, 2016, to 1641 EDT on April 7, 2016, the Division 1 'C' fan brake was also nonfunctional due to a nitrogen bottle being below the required pressure. Therefore, the Division 1 UHS and associated Emergency Diesel Generators (EDGs) would have been inoperable. During this time, at 1347 EDT on April 6, 2016, the Division 2 EDG 14 was inoperable for 22 seconds for a planned testing.</br>This resulted in an unanalyzed condition because the plant configuration during the 22 seconds when EDG 14 was inoperable would not support safe shutdown capability in the event of a tornado. A past operability review is in progress to determine if declaring a MDCT fan inoperable due to a fan brake being nonfunctional results in any additional instances of unanalyzed condition within the past three years. This condition is reportable under 10 CFR 50.72(b)(3)(ii)(B), as an event or condition that results in an unanalyzed condition that significantly degrades plant safety. There was no adverse impact to public health and safety or to plant employees.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
20:29:00, 25 August 2016 +
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21:39:00, 25 August 2016 +
20:29:00, 25 August 2016 +
At 1629 EDT on August 25, 2016, it was det … At 1629 EDT on August 25, 2016, it was determined that a Mechanical Draft Cooling Tower (MDCT) fan should be declared inoperable if its associated fan brake is nonfunctional. The MDCT fan brake is required to prevent fan over speed from a design basis tornado. The MDCT fans are required to support the operability of the Ultimate Heat Sink (UHS). Currently, the MDCT fans and fan brakes are operable. A past operability evaluation is being performed and has initially identified that from 0855 EDT to 1738 EDT on April 6, 2016, the Division 1 'A' fan brake was nonfunctional due to a nitrogen bottle being below the required pressure. Additionally, from 0856 EDT on April 6, 2016, to 1641 EDT on April 7, 2016, the Division 1 'C' fan brake was also nonfunctional due to a nitrogen bottle being below the required pressure. Therefore, the Division 1 UHS and associated Emergency Diesel Generators (EDGs) would have been inoperable. During this time, at 1347 EDT on April 6, 2016, the Division 2 EDG 14 was inoperable for 22 seconds for a planned testing.</br>This resulted in an unanalyzed condition because the plant configuration during the 22 seconds when EDG 14 was inoperable would not support safe shutdown capability in the event of a tornado. A past operability review is in progress to determine if declaring a MDCT fan inoperable due to a fan brake being nonfunctional results in any additional instances of unanalyzed condition within the past three years. This condition is reportable under 10 CFR 50.72(b)(3)(ii)(B), as an event or condition that results in an unanalyzed condition that significantly degrades plant safety. There was no adverse impact to public health and safety or to plant employees.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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Loss of Safety Function +, 05000341/LER-2016-006, Regarding Inadequate Interpretation of Technical Specifications Related to Mechanical Draft Cooling Tower Fan Brake System Leads to Condition Prohibited by Technical Specifications, Loss of Safety Function, and Unanalyzed +, Regarding Inadequate Interpretation of Technical Specifications Related to Mechanical Draft Cooling Tower Fan Brake System Leads to Condition Prohibited by Technical Specifications + and And Unanalyzed +
00:00:00, 25 August 2016 +
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>.
22:16:14, 24 September 2017 +
21:39:00, 25 August 2016 +
true +
false +
0.0488 d (1.17 hours, 0.00696 weeks, 0.0016 months) +
20:29:00, 25 August 2016 +
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.