05000346/FIN-2009005-01
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Finding | |
|---|---|
| Title | Ability of Medium Voltage Cable from Blackout Diesel to Function Long Term in Water Submerged State |
| Description | The inspectors determined that an unresolved item (URI) existed concerning the wetting of medium voltage cables in manhole 3045 and specifically cables BPGD302C, C1, D, and D1. These cables are normally energized and would carry the output of the station blackout diesel generator, when running, to 4160 volt bus D2. On November 5, 2009, the inspectors observed that manhole 3045 was opened for scoping of future design changes and that the manhole was flooded, with the electrical cables submerged. The inspectors subsequently determined that this manhole did not contain any safety-related medium voltage cables, but did contain medium voltage cables that were normally energized for delivering the 4160 volt output of the station blackout diesel generator to station bus D2. In discussions with plant personnel, the inspectors also learned that this manhole communicated via underground conduits with at least two other manholes and that finding the manholes flooded was a common occurrence. Manhole 3045 and the other manholes that connected to this manhole were not provided with sump pump capability. Manhole 3045 was found filled with water on June 4, 2009. The normal inspection interval for this manhole was specified as every 3 years. The inspectors noted that the cables for the output of the station blackout diesel generator were in the stations medium voltage wetted cable replacement program; the existing cables were installed in 1991. The inspectors visual observation of the cables in the manhole did not provide any indication that would question cable present operability. The inspectors did request information on the design of the cables and on commitments associated with the availability of the station blackout diesel generator. The licensee provided the requested information to the inspectors, but the inspectors did not have an opportunity to complete review of the material before the end of the inspection period. Therefore, this issue is considered an unresolved item (URI 05000346/2009005-01) pending completion of the inspectors review of the licensee provided information. The licensee entered the issue in their CAP as CR 09-67489 |
| Site: | Davis Besse  |
|---|---|
| Report | IR 05000346/2009005 Section 1R06 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | J Cassidy D Melendez-Colon J Rutkowski D Jones A Wilson T Go J Cameron P Vossj Rutkowskia Wilson F Mccreesh R Russell J Cameron |
| INPO aspect | |
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Finding - Davis Besse - IR 05000346/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2009Q4
Self-Identified List (Davis Besse)
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