05000348/FIN-2016003-03
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Perform Adequate Preventive maintenance on Circuit Breaker Cell Switch |
| Description | An NRC-identified, non-cited violation of Technical Specification (TS) 3.8.9 Distribution Systems Operating, occurred when the shared 600 VAC 1-2R load center (LC) was inoperable for longer than allowed by technical specifications for Unit 1. The failure to perform adequate preventive maintenance on the ER05-2 circuit breaker cell switch in accordance with licensee procedure FNP-0-EMP-1322.01 was a performance deficiency. This event was entered in the licensees corrective action program as CR 10209365. The licensee cycled the ER05-2 cell switch which cleaned the electrical contact enough to establish continuity to power the closing circuit for the ER02-1 supply circuit breaker and reenergize the 1-2R 600VAC load center. An additional corrective action to replace the cell switch is pending. The performance deficiency was more than minor because it was associated with the equipment performance attribute of the mitigating systems cornerstone and adversely affected the cornerstone objective because inadequate preventive maintenance on the ER05-2 circuit breaker cell switch led to the inability to detect a degraded electrical contact which resulted in the inoperability of the 1-2R 600 VAC load center on April 13, 2016. This finding required a detailed risk evaluation because it represented an actual loss of function of a single train for greater than the TS allowed outage time. The inspectors used the NRC SPAR model for plant Farley to evaluate the significance of this finding. The regional senior reactor analyst reviewed this evaluation and determined that the increase in risk as a result of the performance deficiency was less than 1E-6 per year, a GREEN finding of very low safety significance. This finding was associated with the cross-cutting aspect of Field Presence in the Human Performance area because if deviations from standards and expectations were corrected promptly, the practice of checking a single electrical contact during the cell switch continuity verification would not have existed. [H.2] |
| Site: | Farley  |
|---|---|
| Report | IR 05000348/2016003 Section 4OA3 |
| Date counted | Sep 30, 2016 (2016Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | D Bacon J Dymek K Miller P Niebaum R Baldwin S Sandal |
| Violation of: | Technical Specification |
| CCA | H.2, Field Presence |
| INPO aspect | LA.2 |
| ' | |
Finding - Farley - IR 05000348/2016003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Farley) @ 2016Q3
Self-Identified List (Farley)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||