ML19317F634

Confirmatory Testing of Fire Retardant Seals for Electrical Penetrations Through Fire Barriers Installed at Facility.

ML19317F634
Person / Time
Site:	Davis Besse
Issue date:	09/30/1977
From:	TOLEDO EDISON CO.
To:
Shared Package
ML19317F633	List: ML19317F634
References
NUDOCS 8001220919
Download: ML19317F634 (2)

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ENCLOSURE CONFIRMATORY TESTING E

FIRE RETARDANT SEALS FOR ELECTRICAL PENETRATIONS THROUGH FIRE BARRIERS INSTALLED AT DAVIS BESSE, UNIT 1 TOLED0 EDISON COMPANY (1) Configuration and installation details requiring confirmation are:

(a) That the sealing foam in large openings will retain its structural stability for the entire three hour test period.

(b) That there is no appreciable variation of foam density over the height of large pours of foam.

(c) That an adequate fire seal has been obtained in those instances where cable tray or conduit rests on concrete, and where thickness of foam sealant between concrete cutout and tray or conduit is less than one (1) inch.

(d) That the BISCO SF-20 and Dow-Corning 3-6548 foams are com-patible with each other and themselves. This information has to do with proper bonding of new foam to foam already set when (1) a different foam is used for repairs to an existing fire seal and (2) a large opening is filled by using more than one pour. Since a test of compatability for the BISCO SF-20 and Dow Corning 3-6548 foams cannot be made at this time since no stocks of BISCO SF-20 component materials are available, the Toledo Edison Company shall provide tech-nical information to verify the compatibility of both foams.

Lacking such verification, the Toledo Edison Company shall indicate how they plan to repair BISCO SF-20 seals so as to maintain fire retardant qualities.

(2) The fire testing is to be in accordance with ANSI E119 Standard Fire Test, and details of the test assembly shall include the following:

(a) The major test opening should be at least as large as t:.2 largest opening identified at Davis Besse - 30" X 60". All details of construction of this test speciman should be 8001220) o

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o identical to that existing in the plant including multiple pours and the test panel is to be in the same position as that comoarab'? opening at Davis Besse.

(b) Cable trays should be no smaller than the largest tray used at Davis Besse.

(c) Minimum foam sealant between cable trays or conduits and structural cut out should not be greater than the minimum sealant installed at Davis Besse, Unit 1.

(d) . Cable trays should be filled to the top of the side rails using the same type cables installed in Davis Besse, Unit 1.

(e) Cable trays and conduits should extend into the test furnace and be supported on both sides of fire test section in a manner equivalent to the actual Davis Besse, Unit 1 installation.

(f) Comparative density of foam over height of the largest pour should be determined by generally accepted laboratory pro-cedures.

(g) A standard straight stream hose test as stipulated in S,ection 9.4 and 9.5 of ASTM E119 shall be performed on an identical test specimen after a one hour exposure. In lieu of the standard hose stream test as specified above, the following test may be substituted. A hose stream test shall be conducted on the specimen subject to the three hour test and immediately following the expiration of the three hour fire endurance test.

A hose stream shall use at least a 1 1/2 inch hose discharging through a high velocity fog nozzle having an included angle of spray not greater than 300 Water pressure measured at the base of the nozzle should be at least 75 psi with applica-tion time of at least 21/2 minutes per 100 sq. ft. of test specimen.

(h) If any floor-ceiling installation at Davis Besse are also substantially different from the original test assemblies with respect to size and/or minimum foam sealant between .

the cable trays or conduits and the edge of the cut out, '

the adequacy of these actual in plant arrangements should also be verified by test in the floor / ceiling position.

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