05000293/FIN-2016004-02
From kanterella
(Redirected from 5000293/FIN-2016004-02)
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Ineffective Corrective Actions to Correct High Pressure Coolant Injection System Vibrations |
| Description | Green. A self-revealing Green NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, was identified in that Entergy did not identify and correct a condition adverse to quality related to high pressure coolant injection (HPCI) pump degraded performance, as required by EN-LI-102, Corrective Action Program. EN-LI-102, requires, in part, that individuals closing corrective actions verify that the required action has been taken ensuring that the response is adequate, answers all aspects of the assigned action, and the intent of the action is met. Specifically, vibrations on the HPCI main pump to speed reducer coupling were not addressed during HPCI system maintenance, despite a degrading trend starting May 21, 2015. This led to the HPCI system being declared inoperable on November 7, 2016, after vibration levels exceeded the in-service testing (IST) action range threshold. Entergys corrective actions included modeling vibrations of the HPCI system during operation and installing a stiffening plate on the HPCI pump support pedestal in order to dampen vibrations associated with the system. Entergy has entered this into their CAP as CR 2016-8657. The inspectors determined that this performance deficiency was more than minor because it is associated with the equipment performance attribute of the Mitigating Systems cornerstone and adversely affected its objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage.) Specifically, Entergy did not address the increase in HPCI pump vibrations from May 21, 2015, to November 7, 2016, when the vibrations increased into the IST Action range and resulted in pump inoperability. In accordance with IMC 0609.04, Initial Characterization of Findings, issued October 7, 2016, and IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, issued June 19, 2012, the inspectors determined that the finding was of very low safety significance (Green) because the finding did not affect the design or qualification of a mitigating structure, system, or component (SSC), represent a loss of system and/or function, involve an actual loss of a function of at least a single train or two separate safety systems for a greater time than allowed by technical specifications (TS), or represent an actual loss of function of one or more non-TS trains of equipment designated as high safety-significant in accordance with the licensees maintenance rule program. The inspectors determined that this finding had a cross-cutting aspect in the area of Human Performance, Design Margins, in that the organization operates and maintains equipment within design margins, and margins are carefully guarded and changed only through a systematic and rigorous process. Specifically, Entergy did not demonstrate that the work process supports nuclear safety and maintenance of design margins by minimizing long-standing equipment issues, preventive maintenance (PM) deferrals, and maintenance and engineering backlogs. Entergys failure to effectively manage design margins regarding HPCI system vibrations led to a continuing degradation of the system, and the eventual need to declare the HPCI system inoperable on November 7, 2016. [H.6] |
| Site: | Pilgrim |
|---|---|
| Report | IR 05000293/2016004 Section 4OA2 |
| Date counted | Dec 31, 2016 (2016Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Burritt B Deboer B Dionne B Pinson E Carfang J Deboer J Nicholson J Vasquez N Embert P Cataldo P Ott |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
| ' | |
Finding - Pilgrim - IR 05000293/2016004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Pilgrim) @ 2016Q4
Self-Identified List (Pilgrim)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||