05000327/FIN-2013003-01
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Finding | |
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| Title | Lack of a Vent Hole on the 2B RHR Pump Room Flood Sensor |
| Description | The inspectors identified the lack of a vent hole on the 2B RHR pump room flood level alarm switch protective housing. During a walkdown of the 2B RHR pump room, the inspectors noted that the protective housing that surrounded the room flood sensor, SQN-2-LS-040-0028, had no predrilled vent hole. A visual inspection of several other level sensors located in various other emergency core cooling pump rooms revealed that all sensors had an installed vent hole. A cursory inspection of the housing did not reveal a vent pathway for air. Thus, a rising water level in the room would not necessarily result in a rising level within the protective sensor housing. This non-vented condition could result in an air pocket within the sensors vicinity such that a flooding condition would not be detected by the sensor. A review of the design drawing 47W600-155, detail C155, indicated that a vent hole was required to be installed. Although the sensor protruded slightly (approximately 1/4 inch) below the housing, operability was not ensured. This issue was entered into the CAP as Problem Evaluation Report (PER) 739142. The inspectors also noted that this same condition was noted by an NRC inspector on June 30, 2005 and the corrective action from the associated PER 85204 was to drill a vent hole under work order (WO) #05-777741-000. Pending additional information from the licensee which can provide reasonable assurance that the flood sensor can perform its design function in the non-vented condition, this item was identified as unresolved item (URI) 050000328/2013003-01, Lack of a Vent Hole on the 2B RHR Pump Room Flood Sensor. |
| Site: | Sequoyah  |
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| Report | IR 05000327/2013003 Section 1R06 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | S Shaeffer R Hamilton G Smith J Rivera W Deschaineg Smith P Braxton S Shaeffer W Deschain |
| INPO aspect | |
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Finding - Sequoyah - IR 05000327/2013003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Sequoyah) @ 2013Q2
Self-Identified List (Sequoyah)
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