05000482/FIN-2012008-12
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Finding | |
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Title | Assess Cause of Normal Diesel Fire Pump Failure |
Description | The 2011 failure of the normal diesel-driven fire pump resulted from a catastrophic failure of the pumps right angle drive during the performance of the monthly functionality test for the fire pump. The failed unit had 1060 operating hours (equivalent to 44 days of 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />s/day operation) and had been installed for 27 years. The diesel-driven pump right angle drive had had several periodic oil samples that showed evidence of high concentrations of water and iron. These oil samples were taken every six months, and indicate bearing/bushing and shaft/gear wear along with a heavy concentration of water present. The recommended actions were inspection for source of wear may be warranted at this time and check for source of water. The oil cooler for the right angle drive was replaced on August 18, 2011, as it was determined to be the only possible source of the water that continued to show up in the oil samples. The licensee speculated that the pump seized and caused excessive torque to be placed on the gearbox, which resulted in the gearbox catastrophically failing. The license was having the manufacturer of the pump, Fairbanks-Morse, perform a failure analysis on the pump to determine if the pump caused the failure. This issue will be identified as URI 05000482/2012008-12, Assess Cause of Normal Diesel Fire Pump Failure. |
Site: | Wolf Creek |
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Report | IR 05000482/2012008 Section 4OA5 |
Date counted | Mar 31, 2012 (2012Q1) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 93800 |
Inspectors (proximate) | G Replogle J Dixon J Watkins M Baquera M Runyan N O'Keefe N Okonkwoj Dixonj Robles J Watkins M Haire M Runyan N O'Keefe B Correll G Matharu |
INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2012008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2012Q1
Self-Identified List (Wolf Creek)
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