05000498/FIN-2009003-03
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Finding | |
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Title | Failure to Ensure a Reliable Fire Suppression Water Supply system |
Description | The inspectors identified a noncited violation of License Condition 2.E, Fire Protection, for failure to ensure that equipment required for post-fire safe shutdown system remains free of fire damage. Specifically, the licensee credited manual actions to mitigate the effects of fire damage in lieu of providing the physical protection required by 10 CFR Part 50, Appendix R, Section III.G for the two series-connected volume control tank outlet valves (motor-operated Valve 112B and motor-operated Valve 113A). Failure to ensure that the volume control tank outlet valves relied upon for achieving post-fire safe shutdown were protected from fire damage was a performance deficiency. This finding is of greater than minor safety significance because it impacted the Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to external events (such as fire) to prevent undesirable consequences. Specifically, 13 fire areas contain unprotected cables that had the potential to spuriously close at least one of the volume control tank outlet valves which could result in a loss of suction and damage to the only charging pump credited for post-fire safe shutdown. Based on the senior reactor analyst Phase 3 analysis of the Significance Determination Process, this finding was determined to have very low safety significance |
Site: | South Texas ![]() |
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Report | IR 05000498/2009003 Section 4OA5 |
Date counted | Jun 30, 2009 (2009Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | |
Inspectors (proximate) | J Dixon C Smith B Tharakan C Graves G Pick W Walker J Mateychick N Okonkwo J Watkins |
INPO aspect | |
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Finding - South Texas - IR 05000498/2009003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (South Texas) @ 2009Q2
Self-Identified List (South Texas)
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