05000317/FIN-2008004-01
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Finding | |
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| Title | Failure to Identify and Correct a Degraded 12 CCHX SW Outlet Valve Positioner in a Timely Manner |
| Description | The inspectors identified an NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, because Constellation did not promptly identify and correct a condition adverse to quality (CAQ) related to the Unit 1 No. 12 component cooling (CC) heat exchanger (HX) saltwater (SW) outlet control valve (1-CV-5208). Specifically, Constellation did not promptly identify and correct a degraded condition associated with the valves positioner when 1-CV-5208 did not respond as expected during SW flow verifications on May 13, 2008. Consequently, on May 21, 2008, operators declared the valve inoperable because the valve went from full shut to full open with only 25 percent indicated on the controller. The valve responded erratically because the spindle for the valves positioner corroded and would not rotate to control the position of the valve. The corrosion mechanism was due to SW leaking from the valve packing to the actuator housing and onto the positioner. Constellation entered this issue into their corrective action program (CAP) for resolution as IRE-031-916. The immediate corrective actions following the May 21, 2008 event included the removal, inspection, and refurbishment of the positioner. The planned corrective action includes a modification to prevent SW from leaking outside the actuator housing and to perform preventive maintenance activities to detect degradation of the SW control valve positioners. This finding is more than minor because it is associated with the equipment performance attribute of the Mitigating System cornerstone and affects the cornerstone objective to ensure the availability, reliability, and capability of systems (i.e. component heat removal) that respond to initiating events to prevent undesirable consequences. The inspectors evaluated the significance of this finding using Phase 2 and 3 analyses and determined that the finding is of very low safety significance (Green). This finding has a cross-cutting aspect in the area of problem identification and resolution because Constellation did not thoroughly evaluate SW flow control valve issues (P.1.c per IMC 0305). (Section 1R12) |
| Site: | Calvert Cliffs  |
|---|---|
| Report | IR 05000317/2008004 Section 1R12 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | J Richmond M Davis M Patel S Kennedy N Perry R Rolph J Hawkins |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Calvert Cliffs - IR 05000317/2008004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2008Q3
Self-Identified List (Calvert Cliffs)
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