05000498/FIN-2008008-01
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Finding | |
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| Title | Potential Fire Damage to the Fire Suppression Water Supply System |
| Description | The team identified an unresolved item associated with License Condition 2.E for Unit 1 concerning failure to adequately implement the approved fire protection program. Specifically, the team noted the possibility that the licensees fire protection program may not have ensured a reliable fire protection water supply for the fixed and manual fire suppression systems credited as part of the fire protection program defense-in-depth approach. The fire suppression water supply system has three, 100 percent capacity, diesel-engine driven fire water pumps (PA0121, 0221, 0421) located in the fire pump house. One fire pump is required to supply water for fixed water suppression systems and fire hoses. Each pump will start automatically when low pressure is sensed in the pump discharge header. Each pump can also be started manually via control switches located in the Unit 1 main control room and the fire pump house. All three pumps discharge into a common header that supplies an underground piping ring main system. The team determined that the cables for control room manual pump starting could be damaged by a fire between the control room and the fire pump house. Such damage could result in loss of both automatic pump starting and manual start from the control room. A short to ground on a single cable would prevent the automatic starting of its respective pump. The team also determined that the cables for all three fire pumps are routed in the same cable trays. Therefore, all three cables might be exposed to potential damage by a single fire. Cables N0FP1C1SC, N0FP01C2SB and N0FP01C3SB, are routed together in the same cable trays through nine fire areas (Fire Areas 01, 03, 04, 31, 34, 61, 65, 67, and 70). No water would be available for fire suppression until at least one pump was manually started in the pump house if these cables were all damaged. |
| Site: | South Texas  |
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| Report | IR 05000498/2008008 Section 1R05 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | P Qualls R Mullikin B Correll J Mateychick K Sullivan N O'Keefej Dixonc Smith B Tharakan C Graves G Pick W Walker J Mateychick N Okonkwo J Watkins |
| INPO aspect | |
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Finding - South Texas - IR 05000498/2008008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (South Texas) @ 2008Q3
Self-Identified List (South Texas)
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