05000335/FIN-2014002-02
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Finding | |
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| Title | Evaluation of January 9, 2014 RAB Flooding |
| Description | The inspectors identified an unresolved item concerning external flood water entering the RAB through conduits that did not have internal flood seals installed. On January 9, 2014, during a heavy rainfall event, the sites storm drain system reached capacity due to a partially blocked culvert. As a result, the storm water entered the Unit 1 component cooling water (CCW) area and then overflowed into the emergency core cooling system (ECCS) tunnel located adjacent to the reactor auxiliary building. The water entered two corroded electrical conduits in the tunnel and flowed into the Unit 1 reactor auxiliary building (RAB) -0.5 foot elevation. The licensee cycled drain valves to transfer the water to the ECCS room sump (RAB -10 foot elevation) and pumped the water to an internal storage tank. No safety-related equipment was affected as a result of the water intrusion into the RAB. Six conduits at RAB penetration P19, including the two degraded conduits that allowed water entry into the -0.5 foot elevation, were found not to have internal flood seals installed. A few days after the event, the licensee installed flood seals in the six non-safety-related conduits that penetrated the RAB at penetration P19. Additionally, the licensee initiated a root cause evaluation to determine the cause of the missing conduit flood seals. The issue is an unresolved item pending completion of the inspectors review of the licensees evaluation associated with this event (URI 05000335/2014002-02, Evaluation of January 9, 2014 RAB Flooding). |
| Site: | Saint Lucie  |
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| Report | IR 05000335/2014002 Section 4OA3 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | D Rich J Reyes J Rivera T Morrissey W Loo W Pursleyd Dumbacherj Reyes T Morrissey |
| INPO aspect | |
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Finding - Saint Lucie - IR 05000335/2014002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Saint Lucie) @ 2014Q1
Self-Identified List (Saint Lucie)
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