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| Entered date | Event description | |
|---|---|---|
| ENS 49374 | 20 September 2013 19:45:00 | On 9/20/2013 at 1600 EDT, R.E. Ginna Nuclear Power Plant determined that there was a potential for flooding of both battery rooms during a design basis flood due to unqualified wall penetration material and partially blocked cable vault floor drains. Testing of underground cable vault drain lines failed to demonstrate that they could pass the required flow due to debris accumulation. The penetrations are below grade and approximately five feet above the bottom of the vault floor. During a design basis flood, water could flow through the holes in the vault manhole covers and fill up the vaults to the level of the penetrations. Since the penetration barriers do not appear to be qualified for flooding, leakage into Battery Room B could be expected. Battery Room A and Battery Room B have a normally closed emergency fire door between them that allows water to pass under the door into Battery Room A where a sump pump exists. It is not currently known if the sump pump capacity would have been able to mitigate flooding of both battery rooms. The discovery of this condition is being reported as an unanalyzed condition as defined by 10 CFR 50.72(b)(3)(ii)(B). The 125VDC system is currently Operable. Current weather forecasts do not predict the conditions necessary for flooding. Additionally, compensatory measures have been implemented to provide barriers to water entry into the vault manholes until corrective actions are implemented. The NRC Resident Inspector has been notified of this condition |