Browse wiki

The inspectors identified an unresolved it … The inspectors identified an unresolved item related to the mission time of the TDAF</br>pumps. The licensee assumed a four hour mission time for the TDAFW pump; however</br>TS requirements for the condensate storage tank, which provides the inventory for th</br>TDAFW pump, requires a nine hour water inventory. The inspectors could not resolve the discrepancy during the inspection period. While reviewing inoperability of Cook TDAFW pump room coolers, the inspectors noted that the licensee had calculated that as long as the room temperature remained below 110F, room temperature would not challenge pump operability for four hours. The inspectors recognized that current technical specification bases establish condensate storage tank inventory sufficient for 9 hours of AFW use. The inspectors inquired as to the difference between condensate storage tank inventory requirements and AFW mission time. While the licensee provided technical data to support AFW capability to mitigate that accident, the data provided did not address AFW mission times to cool the plant down to RHR entry criteria. Subsequent review by the inspectors of the licensing basis has yet to resolve the required mission time of the TDAFW pumps. The licensee has provided additional perspective on their position of a 4 hour mission time; however, the information provided raises additional questions that require review. The inspectors concluded that a safety concern does not exist because all room coolers are operable and reasonable assurance exists that the TDAFW can run indefinitely. Therefore, until the inspectors can determine the license basis for TDAFW pump mission time, this issue is an URI. (URI 05000315/2014004-02; 05000316/2014004-02, Turbine-Driven Auxiliary Feedwater Mission Time)e-Driven Auxiliary Feedwater Mission Time) +

Discovered date

23:59:59, 30 September 2014 +

Docket

05000315 + and 05000316 +

Event date

23:59:59, 30 September 2014 +

Finding

05000315/FIN-2014004-02 + and 05000316/FIN-2014004-02 +

Finding integer

2 +

Finding type

URI +

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>.

Hours

1.041667e-4 d (0.0025 hours, 1.488095e-5 weeks, 3.4245e-6 months) + and 4.62963e-5 d (0.00111 hours, 6.613757e-6 weeks, 1.522e-6 months) +

DM.2 +

IP 71111.15, Operability Determinations and Functionality Assessments +

Inspection report

IR 05000315/2014004 +

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>.

00:51:21, 21 February 2018 +

Person