05000244/FIN-2011005-02
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Finding | |
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| Title | Inadequate Maintenance Resulted in the Failure to Properly Tighten Turbine-Driven Auxiliary Feedwater System Threaded Connections |
| Description | A self-revealing NCV of TS 5.4.1.a, Procedures, was identified for Ginna\'s failure to properly tighten turbine-driven auxiliary feedwater (TDAFW) system threaded connections. Specifically, the performance of procedure MMP-GM011-00012, AFW Pump Turbine Major Mechanical Inspection and Mechanical Overspeed Trip Testing, Revision 00200, did not ensure that low pressure trip switch mount threaded connections remained tight. Consequently, high turbine outboard bearing vibrations were noted, and the TDAFW system was declared inoperable. Corrective actions included additional testing and inspection to ensure that no bearing damage had occurred, revising applicable portions of the TDAFW system maintenance procedures, and providing additional guidance for mechanical maintenance and planning personnel. This finding was entered into Ginna\'s corrective action program (CR-2011-8098). This finding is more than minor because it is similar to IMC 0612, Appendix E, Example 3.j., in that, the high vibration resulted in a reasonable doubt on the operability of the system. The performance deficiency is associated with the Mitigating Systems cornerstone attribute of equipment performance (reliability, availability) and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). The inspectors evaluated this finding using Phase 1, Initial Screening and Characterization worksheet of Attachment 4 to IMC 0609. The inspectors determined this finding was not a design or qualification deficiency, did not involve an actual loss of safety function for greater than its technical specification allowed outage time, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. Therefore, the inspectors determined this finding to be of very low safety significance. This finding has a cross-cutting aspect in the area of human performance, work control, in that Ginna failed to plan and coordinate work activities, consistent with nuclear safety. Specifically, the work planning aspects, including the TDAFW system maintenance procedure and work package, did not incorporate the risk insights associated with conducting maintenance activities on risk significant safety-related equipment |
| Site: | Ginna  |
|---|---|
| Report | IR 05000244/2011005 Section 1R15 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | D Dempsey G Hunegs J Schoppy G Dentel P Presby N Perry R Rolph D Dodson M Orr A Dugandzic N Floyd K Cronk |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Ginna - IR 05000244/2011005 | |||||||||||||||||||||||||||||||||||||||||
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Finding List (Ginna) @ 2011Q4
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