ML19208A932
| ML19208A932 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 09/11/1979 |
| From: | Utley E CAROLINA POWER & LIGHT CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| GD-79-2300, NUDOCS 7909180310 | |
| Download: ML19208A932 (2) | |
Text
"T September 11, 1979 File: NG-3514(B)
Seria'l No.: GD-79-2300 Office of Nuclear Reactor Regulation ATTENTION:
Mr. T. A. Ippolito, Chief Operating Reactors Branch No. 3 United States Nuclear Regulatory Commission Washington, D. C.
20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-324 AND 50-325 LICENSE NOS. DPR-71 AND DPR-62 FIRE PROTECTION PROGRAM
Dear Mr. Ippolito:
In his letter of August 28, 1979, Mr. D. G. Eisenhut requested that we subnit, on an expedited basis, any fire protection information that is out-standing with regard to required design details. As related in a conference call on August 31, 1979 between representatives of Carolina Power & Light Company (CP&L) and Mr. H. George of the NRC Fire Protection Review Team, CP&L has updated its fire protection design basis in two locations of the Brunswick Steam Electric Plant (BSEP) to account for the results of recent NRC sponsored cable fire tests conducted at Sandia Laboratories.
Since these tests indicate that electrically initiated cable fires do not spread beyond the cable tray of origin in IEEE 383 qualified cable, and that cable coatings prevent the propagation of fira between cable trays, CP&L's concern has been redirected to center on the protoction of cable from an exposure fire. An exposure fire might
.cause a cable fire to propagate between trays of unprotected IEEE 383 qualified cable or destroy t able integrity due to thermal breakdown.
For these reasons, we have modified :he design of the water suppression system in such a manner that an exposure fire at the floor level will be suppressed before it can-damage cables in the 12 mediate area. In the Service Water Building, Elevation +2', and the Diesel Gerarator Building, Elevation
+2', sprinkler head locations are being modified to spray the general floor area to protect cable trays against an exposure fire. Sprinklers will be installed in conformance with NFPA 13 at the ceiling where feasible; however, where interferences or obstructions prevent effective spray patterns, sprinklers will be lowered and heat collectors utilized.
In isolated cases, specific sprinkler heads and passive protection have been in-stalled to protect cable and conduits where divisionalized cables cross or localized fire hazards exist.
CP&L feels that this revised design basis will provide fire protection for these cables which will be an improvement over the approach discussed pre-viously with members of the NRC Fire Protection Review Team. CP&L requests z
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.-g that your staff review these proposed improvements and notify us of your con-currence so that we may proceed with these modifications in an expeditious manner, in accordance with Mr. Eisenhut's letter of August 28, 1979.
Yours very truly, N
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E. E. Utley Executive Vice President Power Supply & Customer Services EEU/t1
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