05000387/FIN-2011005-04
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Finding | |
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| Title | |
| Description | An NRC-identified, Green NCV of 10 CFR 50, Appendix B, Criterion XI, Test Control, occurred when the Unit 2 RCIC ramp generator signal converter (RGSC) failed during maintenance but post maintenance testing (PMT) failed to identify the failure, which went unrecognized until RCIC tripped on overspeed during its normal operating pressure surveillance on June 29, 2011. Consequently, from June 26, 2011, when PPL commenced a reactor startup and transitioned to plant conditions under which RCIC was required to be operable, until June 29, 2011, PPL RCIC was inoperable. After the RGSC was replaced, RCIC was re-tested via SO-250-002 on July 1 and declared operable on July 2. In response to the event, PPL initiated an apparent cause evaluation (ACE), an RCA, and RGSC post mortem investigation. PPL entered this issue into their CAP as CRs 1430270, 1450534, and 1516769. The failure to conduct adequate post-maintenance testing (PMT) that demonstrates RCIC would perform satisfactorily in service via test procedures was a performance deficiency that was reasonable for PPL to foresee and correct. The finding was more than minor since it affected the equipment performance attribute of the Mitigating Systems cornerstone and its objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, reliable operation and the capability of RCIC in automatic were affected by a failure of its RGSC during the refueling outage. The inspectors evaluated the finding in accordance with IMC 0609 Attachment 4, Phase I Initial Screening and Characterization of Findings, and determined it to be Green, since it was not a design or qualification deficiency, was not a loss of system safety function, and was not risk significant due to an external initiating event. This finding had a cross-cutting aspect in the area of Problem Identification and Resolution (PI&R) - Operating Experience (OE), in that licensees are to implement and institutionalize OE through changes to station processes, procedures, equipment, and training programs. Specifically, PPL did not implement and institutionalize various OE pertinent to RCIC in maintenance, PMTs, and system monitoring. |
| Site: | Susquehanna  |
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| Report | IR 05000387/2011005 Section 4OA3 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Rosebrook C Crisden D Schroeder E Miller J Furia J Greives J Noggle K Modes P Finney P Krohn R Fuhrmeister S Ibarrola T Fish W Schmidt |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Susquehanna - IR 05000387/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2011Q4
Self-Identified List (Susquehanna)
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