ML20082C348
| ML20082C348 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 12/13/1983 |
| From: | PENNSYLVANIA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20079F008 | List: |
| References | |
| FOIA-94-137 F1000, NUDOCS 9504060308 | |
| Download: ML20082C348 (3) | |
Text
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SPECIFICATION CHANGE NOTICE NO.1 IA ET O
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SPECIFICATION NO.
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FILE NUMBER saa riooo DESIGN VERIFICATION YEs O NO O PAGE 1
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SPECIFICATION CHANGE NOTICE NO.
1 FOR TECHNICAL SPECIFICATION glll FOR ELECTRICAL RACEWAY DESIGN AND INSTALLATION OF EXPOSURE FIRE BARRIERS AND FIRE STOPS SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1 AND 2 PENNSYLVANIA POWER & LIGHT COMPANY ALLENTOWN, PENNSYLVANIA
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4.2.2 If the cable tray is not completely filled with cables, Insulation Blanket, the same width as the cable tray shall be inserted over the cables in sufficient layers to bring the outer surface of the Insulation Blanket even with the top of the tray sides and completely fill all void spaces.
The insulation material is to be sandwiched between the cables and the cover.
g The covers are secured per drawing E-49.
4.2.3 The open ends of the Fire Break shall be packed with Bulk Insulation Fiber and sprayed with Mastic Coating to a 1/2 inch wet thickness so as to completely seal the cable tray / cable / Insulation Blanket interface.
4.3 EXPOSURE FIRE BARRIER DESIGN 4.3.1 Exposure Fire Barriers shall be installed as necessary on electrical cable trays, conduits and junction / terminal boxes at locations specified per Susquehanna Fire Protection Review Report Appendix "A".
4.3.2 Exposure Fire Barriers shall be made by encasing the cable trays, ggs conduits and junction / terminal boxes in one or three hour rated barrier system.
4.3.3 The purpose of Exposure Fire Barriers is to prevent damage, during complete engulfment fire, to slestrical cables serving one division of equipment required for stfe shutdown of the plant when redundant safe shutdown divisione occupy the same fire area.
4.3.4 The Exposure Fire Barrier construction system shall also encase all raceway support steel and all metal which could transfer heat within 18 inches of the protected raceway when a 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> rating is specified, and within scs 36 inches when a 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. rating is specified.
4.4 EXPOSURE FIRE BARRIER CONSTRUCTION (Typical For Insulation Blanket Material Only) 4.4.1 Exposure Fire Barriers shall completely encapsulate the indicated cable tray or conduit for the entire length specified.
4.4.2 If the cable tray is not covered and is not completely filled with cables, Insulation Blanket, the same width as the cable tray, shall be inserted over the cables in sufficient layers to bring the outer surface of the Insulation Blanket even with the top of the tray sides.
4.4.3 The first (interior) layer of the Insulation Blanket shall wrap completely around the perimeter of the cable tray with the ends of the blanket overlapping a minimum of 3. inches. Adjacent, blankets shall be placed tightly together so as to prevent any gaps in the butt joints between blankets.
This layer shall be held in place by High Performance Filament Tape spaced not more than 14 inches apart and not less than 4 inches from butt joints.
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