05000387/FIN-2011004-07
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | On July 29, 2011, the Unit 1 RCIC system was declared inoperable when the pump discharge check valve failed to fully shut and consequentially failed the surveillance acceptance criteria. PPL declared the system inoperable and took several days of unplanned unavailability to troubleshoot and repair the check valve. The apparent cause of the check valve failure was sticking or binding as the result of the right hinge pin having excessive axial clearance. The maintenance procedures for disassembly of the check valve, last performed in July 2QQ7, did not specify a tolerance for sideto-side hinge pin clearance. This issue was determined to be a violation of Susquehanna Unit 1 TS 5.4.1, Procedures, which requires that written procedures be established, implemented and maintained as recommended in Regulatory Guide 1 .33, Revision 2, Appendix A, February 1978. Regulatory Guide 1.33, Appendix A, requires procedures to perform maintenance on the RCIC system. The performance deficiency was determined to be more than minor because the finding was associated with the Mitigating Systems cornerstone attribute of Equipment Performance, and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors evaluated the finding using IMC 0609, Attachment 4, lnitial Screening and Characterization of Findings, and determined the finding was of very low safety significance (Green) because it was not a design or qualification deficiency, did not iesult in a loss of safety function or the loss of a train for greater than its TS allowed outage time, and was not potentially risk significant due to external event initiators. The issue was entered into PPL\'s CAP as CR 1444679. |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2011004 Section 4OA7 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Rosebrook E Burket J Greives M Orr P Finney P Krohn S Pindale |
| INPO aspect | |
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Finding - Susquehanna - IR 05000387/2011004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2011Q3
Self-Identified List (Susquehanna)
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