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Inspectors identified a Green non-cited vi … Inspectors identified a Green non-cited violation (NCV) of Technical Specification (TS) 6.8.1 for failure to promptly implement actions to recover the Unit 1 skimmer surge tank (SST) level during the 1R12 Unit 1 refueling outage. Prompt action by the operators would have prevented entrainment of the air into the residual heat removal (RHR) system, elevated radiation levels on the refuel floor, and subsequent entry into off-normal procedure ON-120, Fuel Handling Problems. Exelon entered this issue into their CAP for resolution. This finding is more than minor because it affects the human performance attribute of the Initiating Events cornerstone and the objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The inspectors evaluated this finding using IMC 0609, Appendix G, Shutdown Operations Significance Determination Process, Attachment 1. This finding is of very low safety significance (Green) because the finding did not require quantitative assessment per Checklist 7 of Attachment 1 to IMC 0609 Appendix G. The reactor time-to-boil during this event was approximately 26 hours and adequate time was available to vent and restart the affected RHR pump in the Alternate Decay Heat Removal (ADHR) mode of operation. Additionally, during the time that ADHR was secured, natural circulation provided reactor coolant flow. This finding has a human performance cross-cutting aspect in the area of work practices. Specifically, operators did not follow OP-AA-103-102, Watchstanding Practices, in that they did not promptly implement actions required by the applicable alarm response procedure to recover SST level following receipt of the associated control room alarm (H.4(b))the associated control room alarm (H.4(b)) +

Discovered date

23:59:59, 31 March 2008 +

Docket

05000352 + and 05000353 +

Event date

23:59:59, 31 March 2008 +

3 +

Non-cited violation +

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Hours

3.009259e-4 d (0.00722 hours, 4.298942e-5 weeks, 9.893e-6 months) +

INPO aspect

WP.4 +

Identified by

NRC identified +

Inspection Manual Chapter

NRC Inspection Manual 0609, Appendix G + and NRC Inspection Manual 0609 Appendix G +

Inspection procedure

IP 71111.02 +

Inspection report

IR 05000352/2008002 +

Inspector

J Caruso +, Paul Krohn +, E Gray +, T Moslak +, Elise Burket +, Jeffrey Kulp +, Carey Bickett +, Eugene Dipaolo + and Cherie Crisden +

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>.

03:04:30, 30 May 2018 +

Person