05000395/FIN-2014008-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Degraded Emergency Feedwater System Piping Supports |
| Description | An NRC-identified non-cited violation of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to identify and correct conditions adverse to quality. Specifically, inspectors determined the licensee failed to identify three degraded emergency feedwater (EF) system piping supports during the May 27, 2014, water hammer post transient event walkdown. These included one upstream of the turbine driven EF pump discharge check valve XVC01016-EF (EFH-4018), one downstream of the turbine driven EF pump discharge valve, XVG01036-EF (EFH-0050), and one downstream of the C SG turbine driven EF pump supply stop check valve, XVK0120CEF (EFH-5048) during a routine plant walkdown. Failure to identify three damaged pipe supports as conditions adverse quality during a previous licensee evaluation for the water hammer event was a performance deficiency. This finding was more than minor because it adversely impacted the Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to external events (such as seismic) to prevent undesirable consequences. Specifically, these damaged piping supports resulted in a condition where there was a reasonable doubt on the operability of the EF system. Subsequently, the licensee performed pipe stress calculations and concluded that the EF system was degraded, but operable. In accordance with Manual Chapter 0609.04, Phase 1 - Initial Screening and Characterization of Findings, a significance determination screening was performed and determined this finding was of very low safety significance (Green) because it was not a design or qualification deficiency, and did not represent an actual loss of system safety function. This finding had a cross-cutting aspect in the area of human performance resource because the licensee did not have an approved plant procedure to support the piping walk-downs post water hammer event. H.1 of IMC 0310. |
| Site: | Summer  |
|---|---|
| Report | IR 05000395/2014008 Section 4OA2 |
| Date counted | Sep 30, 2014 (2014Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | P Braxton R Taylor S Ninh S Rose |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
| ' | |
Finding - Summer - IR 05000395/2014008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Summer) @ 2014Q3
Self-Identified List (Summer)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||