05000482/FIN-2009005-12
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Finding | |
|---|---|
| Title | Unevaluated Scaffold Against Component Cooling Water Piping |
| Description | The inspectors identified a noncited violation of Technical Specification 5.4.1.a for failure to properly implement Procedure AP 14A-003, Scaffold Construction and Use, when scaffolding was erected against operable safety-related equipment. On October 15, 2009, the inspectors walked down containment and identified scaffolding in contact with component cooling water piping. The tag on the scaffold explicitly stated that it was not seismically qualified. At the time, both steam generators were inoperable and both trains of residual heat removal were required to be operable. The inspectors reviewed the bases for Technical Specification 3.4.7, RCS Loops - Mode 5, Loops Filled, which required an operable heat sink path from residual heat removal to component cooling water to essential service water. This issue was entered into the corrective action program as Condition Report 22464. The construction of an unqualified scaffold against operable component cooling water piping was a performance deficiency. The inspectors determined that this finding was more than minor because it is associated with the equipment performance attribute for the Mitigating Systems Cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, this issue relates to the availability and reliability examples of the equipment performance attribute because a latent failure mechanism was not evaluated. The inspectors evaluated the significance of this finding using Inspection Manual Chapter 0609, Appendix G, Attachment 1, Shutdown Operations Significance Determination Process Phase 1 Operational Checklists for Both PWRs and BWRs. The inspectors determined that Checklist 3 was applicable because the unit was in cold shutdown with the refueling cavity level less than 23 feet. Using Appendix G, Attachment 1, Checklist 3, Phase 2 analysis was not needed and the finding was of very low safety significance (Green) because the licensee was able to demonstrate that the seismically unqualified scaffolding would not have resulted in a loss of safety function. The inspectors determined the cause of the finding had a human performance aspect in the area of resources. Specifically, Procedure AP 14A-003 was inadequate because it had conflicting guidance that allowed seismically unqualified scaffolds in Modes 5 and 6 H.2.c] (Section 1R20) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2009005 Section 1R20 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | G Vasquez J Drake P Jayroe R Kopriva S Alferink A Fairbanks C Alldredge C Cauffman C Long C Peabody D Graves D Loveless G Miller |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Wolf Creek - IR 05000482/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2009Q4
Self-Identified List (Wolf Creek)
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