05000413/FIN-2016002-02
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Implement Effective Corrective Actions to Prevent Diesel Generator Connecting Rod Bearing Rotations |
| Description | An NRC identified Green NCV of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, was identified for the licensees failure to implement effective corrective actions to prevent repetition of a significant condition adverse to quality regarding connecting rod bearing rotations on the 1A diesel generator (DG). Specifically, the number 6 connecting rod was found rotated approximately 190 degrees following a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> diesel run. The licensee replaced the rotated bearing and implemented modifications on all four Catawba DGs to minimized voiding in the engine driven lube oil pump suction piping. The licensee entered this issue into their corrective action program as CR 2021799. The licensees failure to identify a lubricating oil design discrepancy during the root cause investigation for 1A and 1B DG bearing rotations in 2014 was a PD. The PD was more than minor because it was associated with the equipment performance attribute of the mitigating systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that that respond to initiating events to prevent undesirable consequences. Specifically, the rotation of the 1A DG number 6 bearing resulted in approximately 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br /> of unavailability to replace the bearing. The finding was determined to be of very low safety significance, Green, based on the Phase 1 screening criteria found in IMC 609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions, as the finding did not represent a loss of a system and/or function, and did not represent an actual loss of function of at least a single train for greater than its TS allowed outage time. This finding had a cross-cutting aspect of evaluation, as described in the problem identification and resolution cross-cutting area because the licensee failed to fully evaluate diesel lube oil system discrepancies that contributed to DG connecting rod bearing rotations during the root cause investigation of previous bearing rotation events in 2014. (P.2) |
| Site: | Catawba  |
|---|---|
| Report | IR 05000413/2016002 Section 4OA2 |
| Date counted | Jun 30, 2016 (2016Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Hutto C Scott F Ehrhardt |
| Violation of: | 10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion XVI |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
| ' | |
Finding - Catawba - IR 05000413/2016002 | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Catawba) @ 2016Q2
| |||||||||||||||||||||||||