05000261/FIN-2014002-05
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Finding | |
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| Title | Defective Motor Operated Potentiometer causes failure of the DSDG during surveillance testing |
| Description | An URI was identified regarding the trip of the DSDG, on December 31, 2013, during monthly surveillance testing. The URI is being opened to provide for additional inspection of the equipment issues that led to the failure and to review the results of the vendors analysis of a defective motor operated potentiometer to determine if a performance deficiency exists. On December 31, 2013, during monthly testing of the DSDG in accordance with licensee procedure OST-910, Dedicated Shutdown Diesel Generator (Monthly), the output breaker tripped open on overcurrent while the operators were attempting to adjust DSDG output voltage. Operators in the field noted erratic voltage indication prior to the failure. Engineering identified that the likely cause was a failure of the motor operated potentiometer (MOP). The licensee replaced the MOP with a new part from stock and performed post maintenance testing. The MOP that was removed was sent offsite for forensic analysis. During examination, the licensee identified a manufacturing defect for the MOP. The licensees extent of condition investigation found the same manufacturing defect on the MOP installed in the DSDG and in a MOP in storage. The licensee replaced the MOP in the DSDG with a MOP that was verified to be acceptable. Engineering has sent the defective components back to the vendor for additional analysis. This issue will be identified as URI 05000261/2014002-05; Defective Motor Operated Potentiometer causes failure of the DSDG during surveillance testing. |
| Site: | Robinson  |
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| Report | IR 05000261/2014002 Section 1R12 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | B Collins C Scott G Hopper K Ellis M Batesc Scott D Jackson G Hopper J Dodson K Ellis M Speck S Sanche |
| INPO aspect | |
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Finding - Robinson - IR 05000261/2014002 | |||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Robinson) @ 2014Q1
Self-Identified List (Robinson)
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