05000315/FIN-2013003-01
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Finding | |
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Title | Failure to Identify Through-Wall Leak |
Description | The inspectors identified a finding of very low safety significance with an associated non-cited violation of Technical Specification (TS) 5.4.1 for failure to implement procedures listed in Regulatory Guide 1.33. Specifically, the licensees boric acid control program requires boric acid leakage conditions be identified and documented. However, licensee personnel failed to identify a boric acid deposit indicative of a through-wall leak on the reactor coolant system (RCS) B loop flow indicator instrument line, which was identified by the inspectors. Corrective actions included replacing the section of pipe with the leak and entering the condition into the corrective action program (CAP). The inspectors determined that the failure to identify the boric acid leakage as required by licensee procedures was a performance deficiency that warranted a significance determination. The performance deficiency adversely impacted the initiating events cornerstone objective of limiting the likelihood of events that upset plant stability in that the through-wall leak impacted the equipment performance attribute of barrier integrity. Specifically, the through-wall leak could further deteriorate and result in higher leakage. The inspectors determined the finding was not of more than very low safety significance (Green) using Exhibit 1 of IMC 0609, Appendix A, because the finding could not reasonably result in exceeding the RCS leak rate for a small break loss-of-coolant accident (LOCA); and could not have likely affected other systems used to mitigate a loss of coolant. The finding includes a cross-cutting aspect of planning of work activities (H.3(a)) in the area of human performance. Specifically, the planning did not account for job site conditions, including systems, structures and components that may impact the ability to identify boric acid residue. |
Site: | Cook |
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Report | IR 05000315/2013003 Section 1R20 |
Date counted | Jun 30, 2013 (2013Q2) |
Type: | NCV: Green |
cornerstone | Initiating Events |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.2 |
Inspectors (proximate) | B Bartlett J Cassidy J Lennartz J Laughlin J Ellegood P Laflamme E Sanchez |
Violation of: | Technical Specification - Procedures Technical Specification |
CCA | H.5, Work Management |
INPO aspect | WP.1 |
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Finding - Cook - IR 05000315/2013003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2013Q2
Self-Identified List (Cook)
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