05000261/FIN-2013003-02
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Finding | |
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| Title | |
| Description | An Unresolved Item was identified regarding the discovery of HVS-5, B Emergency Diesel Generator Recirculation Damper failed in the open position. The URI is being opened to provide for additional inspection of the cause of the failure and to review the licensees apparent cause evaluation. On May 1, 2013, B Emergency Diesel Generator Heating and Ventilation System Recirculation damper was found failed in the open position. Visual inspections by engineering determined that the actuator linkage was bent and contacting adjacent ductwork. This condition was identified during a walkdown of HVS-5 RECIRC-DMP following questions by inspectors regarding the position of the damper and operators ability to properly monitor the damper position during EDG surveillance testing. Following the discovery of this issue, operations declared the B EDG inoperable and took immediate corrective actions to close the damper. The HVS-5-RECIRC damper is designed to open when the B EDG is in operation and outside ambient temperature is below approximately 50F. When outside ambient temperatures are above 60F, with the EDG in service, the recirculation damper is designed to be fully closed to prevent air circulation back to the B EDG room supply fan and ensure the diesel room design limit temperature, of 130F, is not exceeded. The licensees initial investigation determined that the failure was associated with inadequacies in the original equipment design of the air actuator and damper linkage. The air actuator was replaced on October 22, 2012, as part of an engineering change to replace obsolete and aging air motors in safety related systems. At the time of discovery, outside ambient temperature was 78F. Engineering performed a past operability evaluation and determined that based on the open damper position and a historical review of outside ambient temperatures between October 22, 2012 to May 1, 2013, the component design limit temperature for the B EDG would not have been exceeded. At the end of the inspection period, inspectors had additional questions regarding vendor guidance for installation of the air motor and previously identified damper failures. Additional inspection time is required to review the licensees apparent cause evaluation. This issue will be identified as URI 05000261/2013003-02, Failure of B EDG Recirculation Damper in the Open Position Results in EDG Inoperability. |
| Site: | Robinson  |
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| Report | IR 05000261/2013003 Section 1R22 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | W Pursley G Hopper A Nielsen J Hickey C Scottc Scottg Hopper K Ellis M Bates R Williams |
| INPO aspect | |
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Finding - Robinson - IR 05000261/2013003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Robinson) @ 2013Q2
Self-Identified List (Robinson)
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