05000445/FIN-2010006-06
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Finding | |
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| Title | Failure to Implement Design Features for Precluding or Minimizing Long-Term Accumulation of Water in Underground Conduits Containing Medium Voltage Safety Related Cables |
| Description | The team identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, which states, in part, that measures shall be established to assure that applicable regulatory requirements and the design basis are correctly translated into specifications, drawings, procedures, and instructions. Specifically, as of June 18, 2010, the underground duct banks connecting the safeguards buildings to the service water intake structure had installed conduit seals at a low point in the cable manholes, thereby defeating the design requirement to avoid or minimize the accumulation of water in the duct banks. This configuration could result in long-term submergence of safety related medium voltage cables and long-term degradation or failure of the cables. This finding was entered into the licensees corrective action program as Condition Report CR-2010-005843. The team determined that the failure to implement a design requirement to avoid or minimize accumulation of water in the underground duct banks was a performance deficiency. The finding is more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of safety systems that respond to initiating events to prevent undesirable consequences. The team performed a Phase 1 screening in accordance with Inspection Manual Chapter 0609, Attachment 4, Phase1 Initial Screening and Characterization of Findings, and determined that the finding was of very low safety significance (Green) because it was a design or qualification issue confirmed not to result in a loss of operability or functionality, it did not result in the loss of a system safety function, it did not represent the loss of a single train for greater than technical specification allowed outage time, it did not represent a loss of one or more non-technical specification risk significant equipment for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and it did not screen as potentially risk significant due to seismic, flooding, or severe weather. This finding did not have a crosscutting aspect because the most significant contributor did not reflect current licensee performance. |
| Site: | Comanche Peak  |
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| Report | IR 05000445/2010006 Section 1R21 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | B Rice J Leivo J Watkins K Clayton M Yeminy P Goldberg R Caniano W Sifre |
| INPO aspect | |
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Finding - Comanche Peak - IR 05000445/2010006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2010Q2
Self-Identified List (Comanche Peak)
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