05000285/FIN-2009006-04
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Finding | |
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Title | Inadequate Corrective Actions to Ensure the Reliability of the Raw Water Pump Power Cables |
Description | The team identified a Green, noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action for failure to take adequate corrective action following the discovery of water intrusion in manholes MH-5 and MH-31 in 1998, 2005, and 2009.Specifically, from 1998 to September 11, 2009, the licensee failed to take corrective action to establish an appropriate monitoring frequency that would mitigate potential common mode failure of raw water 5kV motor cables in underground ducts and manholes. The licensee entered the condition into the corrective action program as CR 2009-4216. The corrective action changed the manhole inspection schedule from an18-month schedule to a quarterly schedule. The finding is more than minor because it adversely affected the Mitigating Systems Cornerstone attribute of design control for ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was of very low safety significance (Green) because it was a design deficiency that did not result in actual loss of safety function. This finding has a crosscutting aspect in the area of human performance, decision making, because the licensee failed to use conservative assumptions in decision-making and adopts a requirement to demonstrate that the proposed action is safe in order to proceed rather than a requirement to demonstrate that it is unsafe in order to disapprove the action. Specifically, since 2005, the licensee decided to postpone installation of proposed water level control corrective actions and failed to appropriately monitor water intrusion inMH-5 and MH-31 multiple times H.1(b |
Site: | Fort Calhoun |
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Report | IR 05000285/2009006 Section 1R21 |
Date counted | Dec 31, 2009 (2009Q4) |
Type: | NCV: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | D Loveless G George G Morris N Okonkwo P Goldberg S Hedger S Wong T Farnholtz W Sherbin |
CCA | , |
INPO aspect | DM.2 |
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Finding - Fort Calhoun - IR 05000285/2009006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fort Calhoun) @ 2009Q4
Self-Identified List (Fort Calhoun)
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