05000289/FIN-2011005-04
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Finding | |
|---|---|
| Title | Adequacy of Flood Protection without Consideration of Wind Generated Wave Activity |
| Description | UFSAR Section 2.6.5, Design of Hydraulic Facilities, stated that a system of dikes protected the site against inundation and wave action for the site design flood of 100,000 cfs. lt further stated that the licensee committed to provide component protection to the degree which would assure a safe and orderly shutdown for the level of flooding postulated by a PMF of 1 ,625,000 cfs. Exelon stated that the 1969 licensing basis commitment was to protect the site from the resultant static water level, but not any wind generated wave activity, for a PMF of 1,625,000 cfs. As a result of the TMI external flood re-analysis, Exelon modified the TMI flood barrier system to accommodate the higher maximum flood height. During site walkdowns, the inspectors observed that the modified design to the flood barrier systems, provided little additional margin for any attendant wind generated wave activity. The inspectors noted that for most site areas, the impact from wind generated waves would be minimal. However, the inspectors identified some components, such as the emergency diesel generators (EDG) could be susceptible. Specifically, the EDG day tank vent could be exposed to attendant wind generated wave activity. The result could be the potential introduction of water into the fuel oil system which could potentially result in a diesel engine failure. In addition, the EDG underground fuel oil storage tank has vent pipes that could be potentially impacted by floating water borne debris. During an external flood event, the EDGs were the credited power source because the off-site power switchyard would be unavailable due to the flooding. The inspectors concluded that the adequacy of the flood barrier system to protect the site for a PMF including the attendant wind generated wave activity was an issue requiring further NRC review to determine if TMI is in compliance with the licensing bases for flood protection. Exelon entered this issue into their corrective action program as lR 1268247, Assignment 21 |
| Site: | Crane  |
|---|---|
| Report | IR 05000289/2011005 Section 4OA2 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | J Richmond D Werkheiser G Hunegs C Cahill S Barr R Nimitz D Kern J Heinly K Cronkc Cahilld Kern D Werkheiser G Hunegs J Heinly J Richmond K Cronk R Nimitz S Barr T O'Hara |
| INPO aspect | |
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Finding - Crane - IR 05000289/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Crane) @ 2011Q4
Self-Identified List (Crane)
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