05000440/FIN-2016004-03
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Finding | |
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| Title | RCS Pressure Boundary Leakage Operation Prohibited by TSs |
| Description | Green. A finding of very low safety significance and an associated non-cited violation (NCV) of Technical Specification (TS) 3.4.5, RCS Operational Leakage, was self-revealed when the licensee operated with reactor coolant system (RCS) pressure boundary leakage, as a result of the failure of the weld connecting the root appendage of the vent line on the recirculation loop A discharge valve, between January 19, 2016, and January 24, 2016, which is a condition prohibited by TS. The licensee entered this issue into the Corrective Action Program (CAP) as Condition Report (CR) 201601071 and performed a significant condition adverse to quality root cause evaluation due to a principal safety barrier being seriously degraded, replaced the vent line appendage on the recirculation loop A discharge valve with a more robust pipe and cap, and developed plans to replace ten additional vent and drain line appendages on the reactor recirculation loops prior to the end of the 1R17 refueling outage in 2019. The inspectors determined that the licensees operation with RCS pressure boundary leakage, a condition prohibited by TSs, was a performance deficiency requiring evaluation. The inspectors determined that the finding was more than minor because it adversely impacted the Initiating Events cornerstone attribute of equipment performance-barrier integrity, and affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The inspectors determined this finding was of very low safety significance because the leak would not have exceeded the RCS leak rate for a small loss-of-coolant accident (LOCA) and would not have likely affected other systems used to mitigate a LOCA resulting in a total loss of their function. The inspectors concluded that this finding had no additional cross-cutting aspects than what was discussed in Inspection Report 0500440/2016001. |
| Site: | Perry  |
|---|---|
| Report | IR 05000440/2016004 Section 4OA1 |
| Date counted | Dec 31, 2016 (2016Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71151 |
| Inspectors (proximate) | A Dahbur G Hansen J Cameron J Nance J Robbins M Bielby M Doyle M Jones M Marshfield N Feliz-Adorno R Baker R Ng S Bell T Briley V Petrella |
| Violation of: | Technical Specification |
| INPO aspect | |
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Finding - Perry - IR 05000440/2016004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Perry) @ 2016Q4
Self-Identified List (Perry)
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