05000461/FIN-2014005-02
Finding | |
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| Title | Potential Failure to Maintain Safety Related Cables in a Qualified Environment |
| Description | The inspectors identified an unresolved item (URI) associated with maintaining safety related cables in a qualified environment. Specifically, cable vaults that contain safety related SX cables were found to be full of water, when opened to perform cable vault inspections. DOn October 14, 2014, the licensee commenced their periodic inspection of safety related cable vaults. These cable vaults house cables related to all 3 divisions of SX and the division 3 emergency diesel generator. When the licensee opened the cable vaults, they found that 6 out of the 10 vaults contained water at a level that would cause the cables to be in a submerged condition. In response to a violation from the 2007 NRC component design basis inspection, th
licensee installed solar powered sump pumps in all of the cable vaults on site. The system included a float mechanism that would provide local indication when water was accumulating in the vaults; a yellow light would indicate water had reached a level requiring pump down of the vault. A red light would indicate water had reached the cables, and therefore immediate actions should be taken to pump down the cable vaults. 12 The licensee discovered the lights were not lit when the vaults were found to be full of water. After further investigation, the licensee concluded that in some cases the float switches that trigger the lights were not functioning properly and in other cases the light bulbs were not functional. The only maintenance performed on the sump pump stations was to replace light bulbs periodically The amount of time the cables were submerged is unknown. The licensees cable monitoring program procedure ERAA300150, Cable Condition Monitoring Program, states that cables should not be submerged for greater than 2 months. The inspectors questioned whether there was an evaluation for establishing a 2-month limit. Due to the probability the cables were submerged for greater than 2 months, the inspectors questioned whether the cables were still operable and what the technical justification was for operability. The licensee indicated the cables were currently operable because the SX pumps are tested periodically and have run without any issues. The inspectors concluded the licensees failure to maintain the safety related cable vaults in a dry condition is a performance deficiency. In order to determine whether the performance deficiency is more than minor the inspectors need to review additiona information, such as the procurement documents, cable testing results, submergence qualification records and the evaluations performed in response to this issue. The URI is opened pending the inspectors review of licensee document (URI 05000461/201400502, Potential Failure to Maintain Safety Related Cables in a Qualified Environment) |
| Site: | Clinton  |
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| Report | IR 05000461/2014005 Section 1R06 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | C Hunt E Sanchez-Santiago J Gilliam J Mcghee M Jones S Bell S Mischke W Schaupc Brownc Lipa E Sanchez-Santiago J Bozga M Jones R Jickling S Bell S Mischke W Schaup |
| INPO aspect | |
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Finding - Clinton - IR 05000461/2014005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2014Q4
Self-Identified List (Clinton)
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