05000334/FIN-2008003-01
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Finding | |
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| Title | Inadequate Maintenance Procedure Results in Unexpected Terry Turbine Speed Increase |
| Description | A self-revealing NCV of 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified in that the licensee failed to incorporate sufficient assembly detail into the maintenance procedure for the governor linkage on the Turbine-Driven Auxiliary Feedwater (TDAFW) pump. The required gaps and tightening criteria for the reassembly of the governor valve linkage were not included in the overhaul procedure resulting in jam nuts loosening, allowing the valve stem to rotate. Rotation of the valve stem caused an uncontrolled change in position of the governor valve position. This resulted in an unanticipated speed increase of the TDAFW during the performance of surveillance test 1OST-24.4 Steam Turbine Driven Auxiliary Feed Pump Test [1FW-P-2]. Corrective actions included a change to the maintenance procedure and the installation of spacer shims for the anti-rotation block. This finding was more than minor because it affected the equipment performance attribute of the associated Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. In accordance with NRC Inspection Manual Chapter (IMC) 0609, Attachment 609.04, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to be of very low risk significance. The cause of this finding is related to the cross-cutting area of human performance, in that FENOC did not maintain a complete, accurate, and up-to-date governor overhaul procedure in regards to actuator reassembly which resulted in speed control degradation to the TDAFW [H.2.(c)] |
| Site: | Beaver Valley |
|---|---|
| Report | IR 05000334/2008003 Section 1R15 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | T Moslak D Werkheiser P Kaufman A Ziedonis D Kern D Spindler R Bellamy |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Beaver Valley - IR 05000334/2008003 | |||||||||||||||||||||||||||||||||||||||
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Finding List (Beaver Valley) @ 2008Q2
Self-Identified List (Beaver Valley)
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