05000280/FIN-2008006-03
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Finding | |
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| Title | Failure to Use Limiting Case High dP In 2-FW-MOV-260A Design Calculations (Section 1R21.2.19) |
| Description | The inspectors identified a Green non-cited violation of 10 CFR 50, Appendix B, Criterion III, Design Control, for failure to evaluate the most limiting differential pressure (dP) for opening valve 2-FW-MOV-260A, auxiliary feedwater (AFW) cross-tie motoroperated valve (MOV). This finding was entered into the licensees corrective action program as condition report 091698. Planned corrective actions included internal inspection of the valve and revision of the evaluation that identified the most limiting dP for opening. This finding is more than minor because it affects the Mitigating Systems Cornerstone objective ensuring the availability, reliability, and operability of the AFW system to perform the intended safety function during a design basis event and the cornerstone attribute of Design Control, i.e. initial design and plant modifications. The inspectors assessed the finding using the SDP and determined that the finding was of very low safety significance (Green) because the deficiency did not result in 2-FW-MOV-260A being inoperable based upon additional analysis which showed that the MOV had sufficient margin to accommodate opening against the worst case high dP. The inspectors determined that the lack of control or understanding of the actual margin to maximum allowable dP to open 2-FW-MOV-260A was a significant cause of this performance deficiency. Failure to maintain design margins is directly related to the Resources component of the cross-cutting area of Human Performance and the aspect of maintenance of plant safety by the maintenance of design margins (H.2(a)). (Section 1R21.2.19) |
| Site: | Surry  |
|---|---|
| Report | IR 05000280/2008006 Section 1R21 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | C Baron G Skinner S Rose W Fowler R Berryman J Hamman G Gardner B Desai B Collins |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Surry - IR 05000280/2008006 | |||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Surry) @ 2008Q1
Self-Identified List (Surry)
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