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Responds to NRC Re Violations Noted in IE Insp Repts 50-373/82-54 & 50-374/82-22.Corrective Actions:Fire Seal Acceptable If Seal Contains No Cracks,Voids or Separations Greater than 3/8-inch Wide
	ML20079S319
Person / Time
Site:	LaSalle
Issue date:	06/24/1983
From:	Farrar D; COMMONWEALTH EDISON CO.
To:	James Keppler; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20079S256	List: ML20079S278; ML20079S319;
References
	6817N, NUDOCS 8307110434
	Download: ML20079S319 (202)
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. /D Commonwealth Edison'

) One First Nati;nal Plan, Chicigt, Illinois

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\ O 'J Address Reply to: Post Office Box 767

( / Chicago, Illiriois 60690 June 24, 1983 1

Mr. James G. Keppler, Regional Administrator

- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road

-Glen Ellyn, IL 60137

Subject:

LaSalle County Station Units 1 and 2 Firecode CT Gypsum Cement Firestops NRC Inspection Report Nos.

50-373/82-54 and 50-374/82-22 (

NRC Docket Nos. 50-373 and 40-374 References (a): R. L. Spessard letter to Cordell Reed dated April 28, 1983.

(b): D. L. Farrar letter to J. G. Keppler dated May 27, 1983.

(c): D. L. Farrar letter to J. G. Keppler dated June 10, 1983.

Dear Mr. Keppler:

The subject inspection report requested that we address the following issues concerning the fire endurance capability of U.S. Gypsum Firecode CT Gypsum cement firestops:.

1. Cracking and separation

2. Breakthroughs

3. Cable density

4. Deviation from test configurations

5. Mixture control Attached is our response to these items and the documentation which justifies our position. A list of the documentation that is enclosed is provided in Attachment 1.

As explained in Reference (c), our response regarding the Unit 1 wall penetrations will be submitted by August 5, 1983.

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J. G. Keppler June 24, 1983 To the best of my knowledge and belief the statements contained herein and in the attachment are true and correct. In some respects these statements are not based on my personal knowledge but upon informa-tion furnished by other Commonwealth Edison and contractor employees.

Such information has been reviewed in accordance with Company practice and I believe it to be reliable.

If there are any further questions in this matter, please contact this office.

Very uly you

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D. L. Farrar Director of Nuclear Licensing 1m alN W'cc: NRC Resident Inspector - LSCS 1/0 Attachment 6817N

w ATTACHMENT Engineering Response to Inspection Report No.'s

, 50-373/82-54 and 50-374/82-22

1. Cracking and Separation The cracks and voids, which varied in width from hairline to 3/8", found in some penetration firestops of Firecode CT Gypsum Cement do not degrade the fire endurance capability of the seal. Seven of the attached reports document cracking in fire seals that were successfully tested. U.S. Gypsum (USG) fire test report no.'s 1, 3, 5, and 6 reference hairline cracks, USG report no. 7 and Transco report no.1 reference 1/8" wide cracks, and USG report no. 2 references 1/2" wide cracks.

The LaSalle penetration firestops also have a layer of Thermafiber CT Felt in addition to the gypsum cement. Although the felt by itself can not withstand the hose stream test, it will prevent the passage of flame and hot gases.

Successful tests on penetration firestops containing only Thermafiber CT Felt are documented in USG report no.'s 6, 7, and 8. In test no. 6, the felt pre-vented the cables above a cable pan penetration from burning (see Detail D1).

USG report no. 7 also documents a successful three-hour test on a cable pan penetration in which only felt was installed around the pan. USG report no. 8 documents a successful 25-hour test on many different types of penetrations containing only thermafiber. This test was terminated before three hours had expired because of problems with the penetrations containing galvanized pipes.

We consider a fire seal acceptable if it contains no cracks, voids, or sepa-rations greater than 3/8" wide. Cosmetic factors such as surface smoothness, ripples, craters, fine surface cracks, chips, gouges, and all other minor blemishes are also acceptable. Any crack in the CT Gypsum cement greater than 3/8" wide is to be cleaned and repaired with the gypsum cement.

2. Breakthroughs Breakthroughs, the addition of cables to a seal, do not degrade the integrity of the firestop if the spaces around the new cables are filled with gypsum cement. USG report no. I and both Transco reports document successful three-hour fire tests on penetration firestops containing breakthroughs. In the USG test, four cables were removed from two openings and two cables were added to two penetrations. Transco report no I documents a test on a penetration fire seal that four cables were added to. The second Transco report describes a

. test on a penetration fire seal with two breakthroughs. Although one of the two cables that were added ignited, no openings in the seal occurred. This cable was not qualifled to IEEE 383 and did not ignite due to the passage of flame or hot gases. The copper conductors in the cable transferred enough heat to cause the cable jacket on the unexposed side to auto-ignite.

Since breakthroughs do not degrade the fire seal because the new gypsum cement bonds to the old cement, there is no limit on the number of breakthroughs in the seal as long as the cable fill density has not been exceeded. A fire seal with "n+1" cables has the same integrity as a seal with "n" original cables and to which a cable is added.

3. Cable Density I

No cable tray penetration in a three-hour fire rated wall in Unit 2 or in a three-hour fire rated floor in either unit has a cable density greater than the maximum density tested. The maximum cable pan density tested is 40% for floor penetrations (USG report no.1 and both Transco reports) and 51% for wall penetrations (USG report no.'s 5 and 7). As documented by the S&L letters, no floor-penetration has a cable density greater than 40%, and the maximum density in a Unit 2 wall penetration is 49.1%.

For your information, the cable pan densi,ty is calculated by dividing the sum of the cross sectional area of the cables by the cross sectional area of the cable pan and multiplying by 100. The attached S&L letter dated June 17, 1983, explains the relationship between the c.ible pan density (CD) and the SAL design' index (DI) for vertical cable riser penetrations. For horizontal cable pan penetrations, the formula is:

CD = (TT/4) 2 X DI X 100 As stated in reference (c), we will furnish our response regarding the Unit I wall penetrations by August 5, 1983.

4. Deviation from Test Configurations The design of all the penetration firestops at LaSalle is verified by the at-tached test reports. The installed penetration seals are either identical or similar to at least one of the penetration configurations that were tested.

Some of the tests also represent a more severe service condition on this type of seal than it can experience in the plant because thermafiber felt was not used in the test or the stress on the test specimen was greater.

a. Control Room Floor Penetrations The fire endurance capability of the control room floor penetrations is verified by the two attached Transco test reports. Transco report no.

+

TR-109 describes a three-hour fire test on a 32" X 109.5" penetration containing Firecode CT Gypsum cement. Although the surface area of the test specimen is 26% smaller than the 28" X 170" control room floor pene-tration, they have similar configurations. Both penetrations are long and narrow and have the same thickness of gypsum cement. However, the test specimen was subjected to a more severe service condition because it had cable trays, which increase the loading and heat conduction, and tnerma-fiber felt only inside the cable trays. The control room floor penetration fire seals have no cable trays and have a layer of felt throughout the seal. The test specimen is also four inches wider, and for these typescof penetrations, the maximum stress that the seal can withstand decreases as "

the width increases but varies very little with changes in the length.

Therefore, the heat transfer rate per unit area and the stress on the test

penetration is greater.

l

The other Transco report describes a test on a 5' X 6' penetration which is only 10%. smaller than the 28" X 170" centrol room floor penetration.

This test also represents a more severa service condition for the firestop because the test specimen had eight cable trays and no thermafiber felt.

The stresses at the side of the test seal are also greater because the hose stream produces a greater bending moment, and the gypsum cement has less surface area to adhere to than in long and narrow type penetrations.

b. Floor Penetrations with 12" X 30" Cable Trays Although none of the attached reports describe a test on a penetration firestop with a 12" X 30" cable tray, many of them describe tests on pene-trations with similar or multiple cable trays. USG re documentatestona30"X4"and36"X4"cabletrdy,portno.'s1and4 respectively. The Transco reports describe tests on penetration seals with three and eight cable trays and the sum of the cross sectional area of the cable trays used in each test is greater than the 12" X 30" cable tray. This increases the heat transfer rate and loading of the seal. Thus, the test specimens were subject to a more severe service condition than the field installations can experience.

5. Mixture Control The attached USG letters provide additional information regarding Firecode CT Gypsum Cement. The June 8,1983, letter describes what gypsum cement is, how it is made, what happens when water is mixed with it, and how temperature af-fects it. The other USG letter furnishes additional information on the water-to-plaster ratio and the dry density range. As explained in these letters, the effectiveness of the gypsum cement fire seal is not a function of this ratio or density, it is dependent on the integrity of the seal after it is installed.

Therefore, based on the inspection results, we consider the seals to be operable.

Please note that USG Research Center analyzed a portion of a seal that had been removed and found that its density was within the range of 25 to 30 lbs/ft3.

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Attachment 1 List of Attached Documentation .

A. U.S. Gypsum Fire Test Reports

1. Concrete Floor Fire Stop Test of Nonqualified IEEE 383 Cable Penetrations Protected with Firecode CT Gypsum and Thermafiber Felt dated March 14, 1980.

2. Fire Stop Systems Without Cable in a Three-Hour Fire Rated Wall dated ,

September 6, 1979.

3. Concrete Floor Fire Stop Test of IEEE Qualified Cable Penetrations dated ,

August 13, 1979.

4. Poke-Thru Wall Fire Test dated May 21, 1979.

5. Firestop Systems for Electric Cable Penetrations Thru Three-Hour Fire Rated .

Wall dated March 20, 1979.

6. Fire Test of Concrete Floor Slab with Electrical Cable Penetration Firestops dated December 7,1978.

7. Firecode CT Gypsum Thermaffber Access Firestopping for Walls dated July 24, 1978.

8. Thermafiber Access Firestopping for Floors dated June 19, 1978.

B. Transco Fire Test Reports

1. Report No. TR-109, Fire and Hose Stream Tests of TC0-001 Cement (USG -

Firecode CT Gypsum Cement), dated April 7, 1983.

2. Fire Endurance Test on Transco Penetration Seal Systems in a Concrete Floor Utilizing Firecode CT Gypsum Cement dated August 5, 1981.

C. Letters

1. June 17, 1983, letter from Mr. J.S. Esterman of S&L to Mr. T.E. Watts (SCE-1829).

2. June 14, 1983, letter from Mr. J.S. Esterman of S&L to Mr. T.E. Watts (SCE-1827) .

3. June 8,-1983, letter from Mr. R.G. Lange of USG to Mr. E.L. Seckinger.

4. June 3,1983, letter from Mr. R.L. Bartlett of USG to Mr. E.L. Seckinger.

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, 'M { (*- NORMAN L. SCOTT PE.SE ,

.-1 ARMARD H. GUSVAFERRO PE.SE LESLIE D. MARTIN PE,SE

, GERALD E. GOETVSCHE PE SE THE CONSULTING E N G l 'N E E R S GROUP INC.

1701 E. Lake Avenue a Glenview, Illinois (Chicago Suburb) 60025 312 729-0646

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Aug0st 13,1979 i

UNITED STATES GYPSUM COMPANY ,

1000 East Northwest Highway l

Des Plaines, IL 60016 l

9 Gentlemen:

Attached is a report, " CONCRETE FLOOR FIRE STOP TEST OF 1EEE 383 QUALIFIED "

l CABLE PENETRATIONS", by D. L. Orals and P. S. Quigg. The report describes a fire test conducted at the United States Gypsum Company Research Center on April 26,1979. The assembly was tested in accordance with IEEE Standard Cable Penetration Firestop Qualification Test Procedure 634-1978. l

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The purpose of the test was to determine the effectiveness of the system employing THERMAFIBER and FIRECODE CT G,YPSUM for " fire-stopping" cable penetrations through floors. The specimen consisted of a 6-in. solid concrete floor with several openings. Cables were placed within cable trays which penetrated through four of the openings, and groups of cables.were placed through several circular openings. The spaces within the openings around the cables were firestopped by a combination of FIRECODE CT GYPSUM and THERMAFIBER.

The underside of the floor was subjected to a standard (ASTM E119) fire exposure for three hours. Temperatures of the cables on th'e unexposed surface were moni-tored throughout the test. None of the cables ignited beyond the unexposed sur- *

[' face and none of the recorded temperatures reached 700 F. After the fire test the fire-exposed surface was subjected to a 30-psi hose stream test. All but one ;

1 of the firestopped assemblies withstood the hose stream test. ,

it is my judgment that the report presents .the data accurately.

Respectfully submitted,

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[==N Armand H. CustaferroI

/2917 N Registered Structural Engineer No. 2917 U State of Illinois gy

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UNITED STATES GYPSUM COMPANY 1000 East Northwest Highway / Des Plaines, Illinois 60016 . RESEARCH CENTER AREA CODE 3et CYPRESS 9-3387

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CONCRETE FLOOR FIRE-STOP TEST OF IEEE 383 QUALIFIED CABLE PENETRATIONS t

i C'D n D. L. O RALS , P.E.

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RESEARCH ASSOCIATE MGR. STRUCTURAL AND FIRE TESTING 9

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INTRODUCTION 4 s

A concrete slab containing both circular and rectangular openings with IEEE 383 qualified electrical power and control cable was sub-jected to fire exposure at the United States Gypsum Company's Research

.' - Center in Des Plaines, Illinois. ,

The purpose of this investigation was to determine the effective-

. ness of the system employing USG FIRECODE CT. Gypsum and THERMAFIBER CT i

Felt for " fire-stopping" the area where the cables penetrate the floor.

The slab thickness was 6 inches; to simulate the behavior of thicker floors, metal sleeve retainers were placed above the openings providing a deeper fire-stop detail.

SAMPLE PREPARATION:

A floor slab, sized to fit the floor furnace in the U.S.G. fire test facility, was cast of lightweight concrete, 6 in. thick, containing four rectangular and twelve circular. openings as shown in Fig. 1. All the openings, except H and N, were fitted with 3 in. high, sheet metal collars fastened in place with 1/4 in. by 1-3/4 in. TAPCON anchors.

Opening N received a 6 in, high collar and opening H had no collar. A 3/8 in. bead of silicone caulking was placed between the collar flange

. I and concrete surfaces to ensure a watertight seal.

Cables, 6 ft long, extending one foot below the underside of the

slab, were placed in the openings. A description of the cables is given in TABLE I and the distribution, quantity, and area are shown in TABLE II. Sketches showing the details of the fire'-stop are shown on Figs.'3 and 4.

THERMAFIBER CT Felt (nominal 4 pounds per cubic foot density), 4 in.

1 thick, was cut to the approximata shape of the opening and fitted between I the concrete floor and cables. Remaining voids adjacent to the cable were filled with small pieces of felt to complete the seal. In areas

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e where the felt needed support, wire baskets formed as shown on Fig. 5 were installed.

FIRECODE CT ' Gypsum in 40 pound bags was mixed with 68 to 70 pounds

., of water in a Carrousel mixer and sprayed between and around the cables in the openings to a depth of- 5 inches above the felt. The gypsum was 5

mixed with an accelerator at the nozzle during spraying to produce a .

set time of 10 to 15 minutes. All the openinhs.were filled with FIRECODE CT Gypsum except opening I which was filled with vermiculite concrete.

The proportions of the vermiculite concrete were 15.6 pounds of port-land cement to 1 cubic foot vermiculite to 3.6 gallons water.

The fire-stops were forced-air dried for a minimum 9 days prior to testing.

INSTRUMENTATION:

Locations of the thermocouples on the sample are shown on Fig. 2.

Temperatures were recorded on the unexposed surface of the concrete floor and on the fire-stop details as well as on the jackets of the cables a,nd on the cable trays at the interface of the unexposed face of the floor as outlined in "IEEE Standard 634-1978."

j ,

TEST PROCEDURE : .

The specimen was subjected to a fire programmed in accordance with

, the ASTM E119 time-temperature curve (as required by IEEE 634-1978).

Furnance temperatures were monitored and controlled by five thermocouples enclosed in protection tubes distributed throughout the furnace, located 12 inches below the exposed surface of the floor (see Graph 10).

TEST RESULTS :

The fire endurance test was conducted on April 26, 1979, at the United States Gypsum Company Research Center. Following is a record j of observed events as they occurred: l j

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Time Min. Observations 4 All cable on exposed surface burning but no smoke on unexposed surface. ,

64 Penetration L smoking slightly on unexposed surface.

'l 69 Smoke or steam coming from penetrations P and C on unexposed surface. ,

70 Hairline cracks in FIRECODE CT Gypsum at penetrations N,O, and P on unexposed surface. Cracks run frdm corner of tray to corner of metal retainer.

Penetration J steaming.71-104 Cable in penetration L swelling up and popping during this time period.

112 Crack in FIRECODE CT Gypsum of penetration L.

135 g Slight amount of smoke or steam coming from all pene-trations with cables.

165 Cracks in penetrations N, O, and P have increased to about 1/16 inch in width. ,

180 Cable covering on expo, sed surface of slab still, burning. ,j 181 Test terminated - Cable insulation on exposed surface still burning. -

As soon as practical, about one-half hour, after the fire I

endurance test was terminated, the assembly was removed from the furnace and subjected to a hose stream test as shown in Fig. 6.

The 30. psi hose stream, with the nozzle 17 feet away from the center of'the assembly, was applied to the entire exposed surface for 82 seconds as prescribed in IEEE Standard 634-1978 for tests of specimens representing industr'ial and commercial applications. All the penetrations except O withstood the force and erosion of the hose stream without passage of water to the unexposed surface,. Pene-

. .? . .

tration O failed when the hose stream passed over it the third time.

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Graph o. 1 shows tempeia~tures measured on opening N_.

Graph No. 2 shows temperatures measured on opening P.

'. Graph No. 3 shows temperatures measured.on opening M.

Graph No. 4 shows temperatures measured on opening O.

Graph No. 5 shows temperatures measured on openings D & I. /

Graph No. 6 shows temperatures measured on openings G, H, J and on concrete slab. .

Graph No. 7 shows temperatures measured on openings A & B.

Graph No. 8 shows temperatures measured on openings E~& F.

Graph No. 9 shows temperatures measured on openings C, L'& K.

Graph No.10 shows temperatures measured.in furnace chamber.

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RESULTS :

C No passage of hot gases sufficient to ignite the cable or fire-stop materials or flame occurre'd during the three hours of fire exposure through the fire-stops described in this report. None of the thermocouples on the exterior of the cable jackets at the int'er-i

'f' ace of the fire-stop reached 700 F during fire exposure.

All the fire-stops except opening o resisted the impact"and l

erosion of a 30 psi hose stream applied for 82 seconds without passage f i of any water. Therefore, all details except opening o qualified under j Standard IEEE 634-1978 for industrial and commercial applications.

nll fire-stop details described in this report prevented the 4

passage of flame and hot gases sufficient to ignite the cable covering 4

fof three hours of ASTM E119 time-temperature fire exposure. Tempera-tures measured on the room side of the cable indicated that the cables in all fire-stops remained below 700 F. Therefore, all fire-stop details qualified under the fire endurance portion of Standard IEEE 634-1978.

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TABLE I CABLE DESCRIPTION Type I Marking on cable: The Okonite Co. 1975 09106 Cable O.D. - 0.93 in. - Area 0.68 in2 Power Cable - Ethylene-Propylene-Rubber, Chlorosulfonated Polyethylene covering Black two-ply exterior cover over 37 silver-coated conductors 0.097 in. dia.

IEEE 383 Fire Test Qualified Type II Marking on cable: The Okonite Co. PLT #7 3CDR3 #14 AWG Okonite Okolon 600 V 1977 Cable O.D. - 0.55 in. - Area - 0.24 in2 Control Cable - Ethylene-Propylene-Rubber, Chlorosulfonated ,

Polyethylene (Hyalon) .

Black exterior cover, three black interior insulated wires marked: 1-black, 2-white and 3-red. Each interior conductor consists of 7 strands 0.03 in.

thick silver-coated copper wire.

IEEE 383' Fire Test Qualified Type III Marking on cable: The Okonite Co. PTL #7 09106 Reel #12 1976 - 600 V 2 Cable O.D. - 1.15 in. - Area 1.04 in Control Cable - Ethylene-Propylene-Rubber, Chlorosulfonated

' Polyethylene covering Binck exterior cover over 9 interior black insulated conductors numbered and color coded. Each interior conductor consists of 7 strands of 0.038 in. dia.

silver-coated copper wire.

IEEE 383 Fire Test Qualified Type IV No marking on cable. Marking on Reel: Kerite Co.

500 MCM 1/C 600 V Power Cable Kerite insulation Cable O.D. - 1.22 in. - Area - 1.17 in2 Black exterior two-ply cover over 37-0.115 in. dia.

silver-coated copper wire.

IEEE 383 Fire Test Qualified s

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e TABLE II PENETRATION INFORMATION Cable Type Cable Cable Opening Quantity Area Opening & Area % of Opening A 2 Type I -5 6 in. Round Hole 3.4 in Type II -14 3.4 in 2 28.3 in2 Type III- 3 3.1 in 9.9 ine 35%

B Type II -42 2 6 in. Round Hole 10.1 in 28.3 in2- 36%

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D Type III- 3 3.1 in2 4 in. Rgund Hole 12.6 in 25%

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F Type I -1 0.7 in2 8 in. Round Hole Type II - 5 1.2 in2 50.3 in2 Type III- 1 1.0 in2 6%

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3.5 in2 L TypeIV -3 4 in. Rgund Hole 12.6 in 28%

M Type 1 -12 8.2 in2 24 in. by 6 in.

Type II -36 8.6 in2 Rectangular Open-Type III- 8 8.3 in2 ing - 144 in2 25.1 in2 17%

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Cable Type Cable Cable Opening Quantity Area Opening & Area % of Opening N Type I -15 10.2 in 24 in, by 6 in.

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. Type III-10 10.4 in ing - 4 in, by 22 in.

30.7 ind Solid Bottom Cable '

Tray - 88 in2 35%

O Type I -12 8.2 in 36 in. by 8 in.

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25.1 in2 Solid Bottom Cable Tray - 72 in2 35%

2 P Type I -20 13.G in 2 36 in.by 8 in.

Type II -58 13.9 in 2 Rectangular Open- .

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9

.[ NORMAN L. SCOTT PE,SE l

, .* Q. ['-

ARMAND H. GUSTAFERRO PE,SE LESLIE D. MARTIM PE SE l GERALD E. GOETTSCHE PE, SE f

. l THE CONSULTlNG E N G l 'N E E R S GROUP INC.

1701 E.- Lake Avenue

Glenview, Illinois (Chicago Suburb) 60025 312 729,-0646 lT i,

August 13, 1979 UNITED STATES GYPSUM COMPANY ,

1000 East Northwest Highway Des Plaines, IL 60016 Gentlemen:

Attached is a report, " CONCRETE FLOOR FIRE STOP TEST OF IEEE 333 QUALIFIED CABLE PENETRATIONS", by D. L. Orals and P. S. Quigg. The report describes a fire test conducted at the United States Gypsum Company Research Center on April 26,1979. The assembly was tested in accordance with IEEE Standard Cable Penetration Firestop Qualification Test Procedure 634-1978.

The purpose of the test was to determine the effectiveness of the system employing

- THERMAFIBER and FIRECODE CT GYPSUM for " fire-stopping" cable penetrations through floors. The specimen consisted of a 6-in. solid concrete floor with several openings. Cables were placed within cable trays which penetrated through four of the openings, and groups of cables were placed through several circular openings. The spaces within the openings around the cables were firestopped by a combination of FIRECODE CT GYPSUM and THERMAFIBER.

The underside of the floor was subjected to a standard (ASTM E119) fire exposure for three hours. Temperatures of the cables on the unexposed surface were moni-tored throughout the test. None of the cables ignited beyond the unexposed sur-g' face and none of the recorded temperatures reached 700 F. After the fire test

' the fire-exposed surface was subjected to a 30-psi hose stream test. All but one t of the firestopped assemblies withstood the hose stream test.

It is my judgment that the report presents .the data accurately.

Respectfully submitted, TJ:: # IIII .

Armand H. Custaferro /

6 g i

l Registered Structural Engineer No. 2917 Y State of Illinois y i

% h

! AHG:NS i N1 f

/. .. . .

1

- UNITED STATES GYPSUM COMPANY 1000 East Northwest Highway / Des Plaines, Illinois 60016 _ RESEARCH CENTER AREA CODE 312

, CYPRESS 63301 o

,- s l

l i

a CONCRETE FLOOR FIRE-STOP TEST OF ,

IEEE 383 QUALIFIED CABLE PENETRATIONS t

t f

4 l

C'c n D . L . O RALS , P.E.

+OEs P. S. QUIGG, aM P.E.

RESEARCH ASSOCIATE MGR. STRUCTURAL AND FIRE TESTING l

l

INTRODUCTION: ,

A concrete slab containing both circular and rectangular openings

.with IEEE.383 qualified electrical power and control cable was sub-jected to fire exposure at the United States Gypsum Company's Research

'- Center in Des Plaines, Illinois. ,

The purpose of this investigation was to determine the effective-ness of the system employing USG FIRECODE CT Gypsum and THERMAFIBER CT -

i Felt for " fire-stopping" the area where the cables penetrate the floor. ,

The slab thickness was 6 inches; to simulate the behavior of thicker floors, metal sleeve retainers were placed above the openings providing a deeper fire-stop detail.

SAMPLE PREPARATION:

A floor slab, sized to fit the floor furnaca in the U.S.G. fire test facility, was cast of lightweight concrete, 6 in. thick, containing four rectangular and twelve circular openings as shown in Fig. 1. All the openings, except H and N, were fitted with 3 in. high, sheet metal l collars fastened in place with 1/4 in. by 1-3/4 in. TAPCON anchors.

Opening N received a 6 in. high collar and opening H had no collar. A 3/8 in. bead of silicone caulking was placed between the collar flange and concrete surfaces to ensure a watertight seal.

Cables, 6 ft long, extending one foot below the underside of the

slab, were placed in the openings. A description of the cables is .

given in TABLE I and the distribution, quantity, and area are shown in TABLE II. Sketches showing the details of the fire-stop are shown on Figs.' 3 and 4. _

THERMAFIBER CT Felt (nominal 4 pounds per cubic foot density), 4 in.

thick, was cut to the approximate shape of the opening and fitted between ,

i the concrete floor and cables. Remaining voids adjacent to the cable l

l were filled with small pieces of felt to complete the seal. In areas

=

.f or ,

i ' ~

where the felt needed support, wire baskets formed as shown on Fig. 5 were installed.

FIRECODE CT Gypsum in 40 pound bags was mixed with 68 to 70 pounds of water in a Carrousel mixer and sprayed between'and around the cables I

in the openings to a depth of 5 inches above the felt. The gypsum was -

% ~

mixed with an accelerator at the nozzle during spraying to produce a set time of 10 to 15 minutes. All the openinds were filled with FIRECODE CT Gypsum except opening I which was filled with vermiculite concrete.

The proportions of the vermiculite concrete were 15.6 pounds of port-land cement to 1 cubic foot vermiculite to 3.6 gallons water. .

The fire-stops were forced-air dried for a minimum 9 days prior j to testing.

INSTRUMENTATION:

Locations of the thermocouples on th'e sample are shown on Fig. 2.

Temperatures were recorded on the unexposed surface of the concrete floor and on the fire-stop details as well as on the jackets of the cables and on the cable trays at the interface of the unexposed face of the floor as outlined in "IEEE Standard 634-1978."

TEST PROCEDURE:

The specimen was subjected to,a. fire programmed in accordance with the ASTM E119 time-temperature curve (as required by IEEE 634-1978).

)

Furnance temperatures were monitored and controlled by five thermocouples enclosed in protection tubes distributed throughout the furnace, located 12 inches below the exposed surface of the floor (see Graph 10) .

TEST RESULTS: -

The fire endurance test was conducted on April 26, 1979, at the .

United States Gypsum Company Research Center. Following i's a record of observed events as they occurred:

- - - - _ _ - - - __ -,,n. -- e, -- --

r -, , . - - w -,-.-n--,= . , , - . , - -,-w , , ...,,y-r- , , - -, yn--

.~ .

Time Min. Observations 4 All cable on exposed surface burning but no smoke on unexposed surface.

64 Penetration L smoking slightly on unexposed surface.

69 Smoke or steam coming from penetrations P.and C on unexposed surface.

70 Hairline cracks in FIRECODE CT_ Gypsum at penetrations N,O, and P on unexposed surface. Cracks run from

, corner of tray to corner of metal retainer.

Penetration J steaming.71-104 Cable in penetration L swelling up and popping during this time period.

112 C' rack in FIRECODE CT Gypsum of penetration L.

135 s Slight amount of smoke or steam coming from all pene-trations with cables.

165 Cracks in penetrations N, O, and P have increased to about 1/16 inch in width. ,

180 Cable covering on exposed surface of slab still burning.

181 Test terminated - Cable insulation on exposed surface still burning.

As soon as practical, about one-half hour, after the fire endurance test was terminated, the assembly was removed from the furnace and subjected to a hose stream test as shown in Fig. 6.

The 30 psi hose stream, with the nozzle 17 feet away from the

~

center of the assembly, was applied to the entire exposed surface

'for 82 seconds as prescribed in IEEE Standard 634-1978 for tests of '

specimens representing industrial and 4commercia1' applications. All the penetrations except O withstood the force and erosion of the hose stream without passage of water to the unexposed surface. Pene ,

I D

tration O failed when the hose stream passed over it the third time.

Graph No. 1 shows temperatures measured on opening N,.

Graph No. 2 shows temperatures fneasured on opening P,.

'. Graph No. 3 shows temperatures measured on opening M.

Graph No. 4 shows temperatures measured on opening O.

Graph No. 5 shows temperatures measured on openings D & I. !

Graph No. 6 shows temperatures measured on openings.G, H, J and.on concrete slab.

Graph No. 7 shows temperatures measured on openings A & B'.

Graph No. 6 shows temperatures measured on openings E & F.

Graph No. 9 shows temperatures measured on openings C, L & K.

Graph' No.10 shows temperatures measured in furnace chamber.

~

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RESULTS :

No passage of hot gases sufficient to ignite the cable or fire-stop materials or flame occurred during the three hours of fire exposure through the fire-stops described in this report. None of the thermocouples on the exterior of the cable jackets at the inter-

., face of the fire-stop reached 700 F during. fire exposure.

All the fire-stops except opening O resisted the impact'and ,

erosion of a 30 psi hose stream applied for 82 seconds without passage of any water. Therefore, all details except opening O qualified under Standard IEEE 634-1978 for industrial and commercial applications.

All fire-stop details described in this report prevented the

~

. 1 passage of flame and hot gases sufficient to ignite the cable covering )

for three hours of ASTM E119 time-temperature fire exposure. Tempera I I

tures measured on the rcom side of the cable indicated that the cables

]

in all fire-stops remained below 700 F. Therefore, all fire-stop details qualified under the fire endurance portion of Standard IEEE 634-1978. -

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TABLE I CABLE DESCRIPTION Type I Marking on cable: The Okonite Co. 1975 09106 Cable O.D. - 0.93 in. - Area 0.68 in2 Power Cable - Ethylene-Propylene-Rubber, Chlorosulfonated Polyethylene covering

. Black two-ply exterior cover over 37 silver-coated conductors 0.097 in, dia.

IEEE 383 Fire Test Qualified Type II Marking on cable: The Okonite Co. PLT #7 3CDRS #14 AWG Okonite Okolon 600 V 1977 Cable O.D. - 0.55 in. - Area - 0.24 in2 Control Cable - Ethylene-Propylene-Rubber, Chlorosulfonated i Polyethylene (Hyalon) .,

Black exterior cover, three black interior insulated l wires marked: 1-black, 2-white and 3-red. Each interior conductor consists of 7 strands 0.03 in. i thick silver-coated copper wire.

IEEE 383 Fire Test Qualified Type III Marking on cable: The Okonite Co. PTL #7 09106 Reel #12 1976 - 600 V 2 Cable O.D. - 1.15 in. - Area 1.04 in Control Cable - Ethylene-Propylene-Rubber, Chlorosulfonated

' Polyethylene covering Black exterior cover over 9 interior black insulated conductors numbered and color coded. Each interior conductor consists of 7 strands of 0.038 in. dia.

silver-coated copper wire.

IEEE 383 Fire Test Qualified Type IV No marking on cable. Marking on Reel: Kerite Co.

500 MCM 1/C 600 V Power Cable Kerite insulation Cable O.D. - 1.22 in. - Area - 1.17 in2 Black exterior two-ply cover over 37-0.115 in dia.

silver-coated copper wire.

IEEE 383 Fire Test Qualified 4

- '6 '. .

l TABLE II PENETRATION INFORMATION Cable Type Cable Cable Opening Quantity Area Opening & Area % of Opening A Type I -5 3.4 in 2 6 in. Round Hole Type II -14 3.4 in 2 28.3 in2 Type III- 3 3.1 in 9.9 ine 35%

2 B Type II -42 10.1 in 6 in. Round Hole 28.3 in2 36%

C Type I -2 1.4 in2 4 in. Round Hole i Type II - 4 1.0 in2 12.6 in2 l Type III- 2 2.1 in2 35%

4.5 ind i D Type III- 3 3.1 ind 4 in. Rgund Hole ,

12.6 in 25% i E Type I -7 4.8 in22 8 in. Round Hole

. Type II -20 4.8 in 50.3 in2 '

! Type III- 4 4.2 in 2

( 13.8 inz 27%

F Type I -1 0.7 in2 8 in. Round Hole 50.3 in2 Type II - 5 1.2 in2 Type III- 1 1.0 in2 6%

2.9 in2

, G None 0 8 in. Round Hole ,

l 50.3 in2 l

, H None 0 8 in. Round Hole i

i. 50.3 in2 I Type III- 3 3.1 in 2 4 in. Round Hole 12.6 in2 25% !

J None 0 4 in. Pipe Sleeve

, 12.6 in2 K Type I -1 0.7 in2 4in.PjpeSleeve !

Type II - 1 0.2 in2 12.6 in ;

Type III- 1 1.0 in2 '

1.9 inz 15%

L TypeIV -3 3.5 in2 4 in. Rgund Hole '

I 12.6 in 28% j M Type 1 -12 8.2 in2 24 in. by 6 in, f Type II -36 8.6 in2 Rectangular Open i

l Type III- 8 8.3 in2 ing - 144 in2 ,

i 25.1 in2 17% ,

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Cable Type Cable Cable Open'.g Quantity Area Opening & Area % of Opening 2

N Type I -15 10.2 in 24 in, by 6 in.

Type II -42 10.1 in Rectangular Open-2

. Type III-10 10.4 in ing - 4 in, by 22 in.

30.7 inz Solid Bottom Cable Tray - 88 in2 35%

2 O Type I -12 8.2 in 36 in, by 8 in.

. Type II -36 8.6 in Rectangular Open-2 Type III- 8 8.3 in ing - 4 in, by 18 in.

25.1 inz solid Bottom Cable Tray - 72 in 2 35%

2 P Type I -20 13.6 in 36 in.by 8 in.

Type II -58 13.9 in 2 Rectangular Open- .

Type III-14 14.6 in ing - 4 in. by 30_in.

. 42.1 in4 by 4 in. Ladder Type Cable Tray - 120 in2 35%

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'# # NORMAN L. SCOTT PE.SE ARMAND H. Gust AFERRo PE.SE o- LEsuE D. MARTIN PE SE GERALD E. GoETTSCHE PE,SE THE CONSULTING a Glenview,ENGINEERS Illinois (Chicago Suburb)GROUP 60025 lNC.

312 729-0646 1701 E. Lake Avenue May 21, 1979 UNITED STATES GYPSUM COMPANY 1000 East Northwest Highway Des Plaines, IL 60016 Gentlemen:

Attached is a report, " POKE-THRU WALL FIRE TEST," by D. L. Orals and P. S. Quigg. The report describes a fire test conducted at the United States Gypsum Compar.y Research Center on March 6,1979. The assembly was tested in accordance with IEEE Standard Cable Penetration Firestop Qualification Test Procedure 634-1978.

The purpose of the test was to determine the ef fectiveness of combinations of THERMAFIBER and FIRECODE CT GYPSUM used as firestops for cable penetrations through walls. The specimen consisted of an 8-in, solid concrete block wall with ,sev,eral openings. Cables were placed within two cable trays which penetrated through one opening, and groups of cables were placed through three circular openings. The spaces within the openings around the cables were firestopped by a combination of FIREOODE CT GYPSUM and THERMAFIBER.

~

One side of the wall was subjected to a standard ( ASTM,E119) fire exposure for three hours. Temperatures of thu cables on the unexposed surface were monitored throughout the test. Noneofthecablesignitegbeyondtheunexposed

~

surface and none of the recorded temperatures reached 700 F. After the fire test the fire-exposed surf ace was subjected to a 30-psi hose stream test.

The assembl'y withstood the hose stream test.

It is my judgment that the report presents the data accurately.

Respectfully submitted,

,W Armand H. Gustaferro Registered Structural Engineer No. 2917 State of Illinois iSEEE: -

AHG:CJ Enc.

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UNITED STATES GYPSUM COMPANY f RE 1000 East Northwest }ilghway/ Des Plaines,litinois 60016

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POKE-THRU WALL FIRE TEST l

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,o D. L. ORALS , PE May 10, 1979 P. S. QUIGG, PE MANAGER, STRUCTURAL &

l RESEARCH ASSOCIATE FIRE TEST

~

INTRODUCTION:

This report covers a 3-hour fire test of a concrete masonry wall with a large firestopped opening penetrated by two cable trays con-The test sample also contained taining power and control cables.

three circular firestopped openings with power and control cable.

The assembly was tested in accordance with IEEE Standard Cable Penetration Firestop Qualification' Test Procedure 634-1978 and wit-nessed by A. H. Gustaferro of the Consulting Engineers Group Inc.,

Glenview, Illinois.

. CONSTRUCTION:

An 8-inch thick, solid concrete block wall was constructed with a 48-inch by 24-inch rectangular' opening, two 6-inch diameter circular openings, and one 10-inch diameter circular opening, Two, 16-gauge, cable trays, manufactured by the Globe Product Company, 56 inches wide by 4 inches,high by 5 feet long, were placed in the rectangular opening. The top tray was a ladder design and the '

lower tray was a solid bottom design. The trays, placed one above the other,'were secured to a suspended trapeze from 1/2-inch diameter rods attache.d to Globe channels (see Fig. 1). The trays extended 1 foot bayond the exposed face, leaving 3 feet 4 inches of projection beyond the wall face on the unexposed side. Each tray was filled with thirty-six pieces of Anaconda power cable, one hundred pieces of REX Brand control cable., and thirty-three pieces of Collyer control cable (see Tables I and II). .

~

One of the two 6-inch diameter circular openings contained five l

Okonite control cables and five Okonite power cables, and the other contained four Anaconda power cables and-twelve REX Brand.and three Okonite control cables. The 10-inch diameter circular opening was .

4

1 .

i i

CONSTRUCTION (cont'd.)

fitted, with 6-inch diameter pipe sleeve that contained five Anaconda power cables, fifteen REX Brand control cables and four Collyer con-trol cables (see Tables,I and II).

l Twenty-six pounds of FIRECODE CT Gypsum was mixed with 36.1 pounds of water and placed in each tray over the cables in the area where the Tapping the tray with a robber mallet and tray passed thru the wall.

l nt assured that the gypsum

,apreading cable as necessary during p aceme The fl' owed around the cables in the tray to fill al'1 interstices.

" firebreak" was full width of the cable tray, at a height equal to the tray rail height, approxima_tely 16 inches long at the bottom and 12 A temporary form, 16 inches long, centered in inches long at the top.

the wall, was fitted to the bottom of ladder tray to contain the CT Gypsum.

The rectangular opening was closed using 4-inch thick THERMAFIBER CT Felt (4 pcf nominal density) compressed slightly, in the wall and The circular fitted in the opening between and around the trays.

openings were also fitted with 4-inch thick THERMAFIBER CT Felt cen-tered.in the opening. The rectangular opening was finished off with 2' inches of FIRECODE CT Gypsum machine applied .

to the THERMAFIBER on cach face,,in two coats. The mix proportions were 56 pounds of water per 50. pounds of FIRECODE CT Gypsum.

The circular openings were sealed by pouring a mixture of the FIRECODE CT Gypsum (50 pounds of FIRECODE CT Gypsum to 69.4 pounds of

'The forms were ;

water) . contained within forms fitted around the cable. i removed when the FIRECODE CT Gypsum had hardened.

The assembly was force air dried for 13 days, assuring a dry speci-men', prior to testing. O L _ _ . : -- . _ . . . ~ - _ _ _ _ -.

.. _ . _ _ -. .. ~. - - - - -.

S

., INSTRUMENTATION :

Locations of the thermocouples on the test sample are shown on Fig. 2. Temperatures were recorded on the unexposed surface of the c:ncrete block wall and FIRECODE CT Gypsum and on the jacket of the cmble and cable tray at the interface of the unexposed face of the wall as outlined in "IEEE Standard. 634-1978".

I TEST PROCEDURE:

The specimen was subjected to a fire programmed in accordance with the ASTM E119 time-temperature curve (as required by IEEE 634-1978).

Furnace temperatures were monitored and controlled by eignt thermo-couples enclosed in protection tubes distributed throughout the furnace, located 6 inches from the wall (see Graph 7).

TEST RESULTS :

The fire endurance test was conducted on March 6, 1979, at the United States Gypsum Company Research Center. Following is a record of observed events as they occurred:

Time Min. Observations

. 2 Cable insulation on exposed side in three circular open-ings burning profusely.

4 Cable insulation in trays on exposed side burning.

8 Large quantity of dense, black smoke in furnace from burning cable insulation.

33 Small quantity of smoke on unexposed surface from center circular opening.

38 -

Small amount of smoke noted on unexposed surface near right circular opening.

50 Liquid dripping from ends of cables in left and right circular openings.

p

~

' TEST RESULTS (cont'd.) l i

u Time Min. Observations l Small amount of smoke noted on unexposed surface by !

110 l upper cable tray.

155 Liquid dripping from cables in upper tray on unexposed surface.

180 Test terminated. s Immediately after the fire endurance test, the assembly was re-moved f' rom the furnace and subjected to a 30-psi hose stream test for 71 seconds as prescribed by IEEE Procedure 634-1978 for tests of speci-msns representing industrial and commercial applications. (See Appendix A) . , All the penetration withstood the force and erosion of the hose stream with no water passing to the unexposed surface.

Graph 1 shows the temperatures measured on the top cable tray.

Graph,2 shows the temperatures measur'ed on the bottom cable tray.

Graph 3 shows the temperatures recorded on circular opening A.

Graph 4 shows the temperatures recorded on circular opening C..

-- Graph 5 shows the temperatures recorded on circular opening B.

Graph 6 shows the unexposed surface temperatures of the FIRE-CODE CT Gypsum and concrete block.

Graph 7 shows the temperatures developed in the furnace during taat. ,

RESULTS AND CONCLUSIONS:

The unexposed surface temperatures on the wall and firestops were wall below the temperature rise limit of 250 F above ambieht specified by ASTM E119 for a 3-hour rating. The concrete block wall developed a 174 F rise and the rectangular firestop developed a 104 F rise, as s

mehsured under asbestos pads, at three hours. The thermocoupleston the e

9

_m,.,.. . . . . . , _ _

RESULTS AND CONCLUSIONS (cont'd.)

firestop not covered by a pad exhibited a maximum rise of only 69 F.

None of the thermocouples on the exterior of' cable jackets at the interface of the firestop reached 700 F during the three hours of ex-posure. The power cable reached a maximum recorded temperature of 522 F and the control cable reached 350 F at three hours. ,The larger conductor power cables transferred more heat to the unexposed surface than the control cable as shown on all the graphs.

The solid bottom cable tray was 144 F hotter than the ladder cable tray at the interface of the firestop at three hours. The additional area supplied by the continuous lower surface presumably caused the rise in siderail temperature.

No passage of hot gases or flame occurred during the three hours of fire exposure through the firestop described in this report. The firestops also resisted'the impact and erosion of the 30-psi hose stream test for 71 seconds without passage of any water as prescribed by ASTM E119 and by IEEE 634-1978 for industrial and commercial appli-cations.

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TABLE I CABLE DESCRIPTION Type I Marking on cable: Anaconda S Durasheath XLP Power Cable Type Use or RHH or RHW 250 MCM 600 Volts (UL)

Power Cable - Cross-linked Polyethylene covering Cable O.D. - 0.77 in. - Area - 0.46 in2 Black exterior cover with transparent inner jacket around 37,0.081 dia. copper conductors.

IEEE 383 Fire Test Nonqualified Type II No marking on cable. Marking on reel:2 REX BRAND Cable O.D. - 0.40 in. - Area - 0.12 in Control Cable - 600 Volt - Polyethylene, Polyvinyl Chloride covering Black exterior cover, colored black, red and white; interior covers over clear cover on each of three wires. 'Each wire contains 7 strands of 0.022 in. dia. '

copper wire.

IEEE 383 Fire Test Nonqualified Type III Marking on cable: Collyer fl0 2 -

Cable O.D. - 1.06 in. - Area - 0.88 in Control Cable - 600 Volt - Butyl Rubber, Polyvinyl Chloride covering Black exterior cover, over clear wrapping and 9 interior black insulated conductors numbered and color coded. Fibrous string intermingled with interior conductors. Each interior conductor consists of 7 strands of 0.039 in, dia. silver-coated copper wire.

IEEE 383 Fire Test Nonqualified Type IV -Marking on cable: The Okonite Co. PTL No. 7 09106 Reel #12 1976 - 600 Volt 2 Cable O.D. - 1.15 in. - Area - 1.04 in Control Cable - Ethylene - Propylene - Rubber, l Chlorosulfonated Polyethylene covering i Black exterior cover over 9 interior black insu-lated conductors numbered and color coded. Each interior conductor consists of 7 strands of 0.038 in.

dia, silver-coated copper wire.

IEEE 383 Fire Test Qualified i

Type V Marking on cable: The Okonite Co. 1975 09106 350 MCM - 600 Volt 2 --

Cable O.D, - 0.93 in. - Area - 0.68 in l J

Power Cable - Ethylene - Propylene - Rubber, Chlorosulfonated Polyethylene covering i B]ack two-ply exterior cover over 37 silver-coated conductors 0.097 in dia.

IEEE 383 Fire Test Qualified m.~ . . _ ..m. m .

TABLE II PENETRATION INFORMATION Cable Cable Raceway or % of Raceway Cable Type or Opening and Quantity Area Opening & Area Location Type I - 36 16.6 in ladder type Tap Tray

' 2 36 in, wide by 40 tottom Tray Type II - 100 12.0 in 33 29.0 in 4 in.* deep Type III -

57.6 in 144 in ,

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Right Type IV -

5 5.2 in 6 in. dia.

Circular 2 2 30 Opsning Type V -

5 3.4 in 28.3 in 8.6 in Type I -

5 2.3 in 6 in dia.

Cdntor Circular 27 Opening Type II -

15 1.8 in 28.3 in Type III - 4 3.5 in 7.6 in L2ft Type I - 4 1.8 in 6 in. dia.

Circular 2 2 22 Opening Type II - 12 1.4 in 28.3 in

' 2 Type IV - 3 3.1 in 6.3 in O

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i APPENDIX A Hose Stream Calculations per ASTM E119 and IEEE Standard 634-1978.

2-1/2 min. (150 sec.) per 100 ft of test slab.

2-1/2 in. National standard glaypipe equipped with 1-1/8 in.

20 ft from exposed face.

tip, nozzle pressure 30 p/in ,

5 Wall area 84 in. x 81 in. = 6804 in 2 =

47.25 ft 2 0.4725 x 150 =.71 sec. , ,

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@@ Line 2: / Line 2: @@
 | number = ML20079S319
 | issue date = 06/24/1983
-| title = Responds to NRC 830428 Ltr Re Violations Noted in IE Insp Repts 50-373/82-54 & 50-374/82-22.Corrective Actions:Fire Seal Acceptable If Seal Contains No Cracks,Voids or Separations Greater than 3/8-inch Wide
+| title = Responds to NRC Re Violations Noted in IE Insp Repts 50-373/82-54 & 50-374/82-22.Corrective Actions:Fire Seal Acceptable If Seal Contains No Cracks,Voids or Separations Greater than 3/8-inch Wide
 | author name = Farrar D
 | author affiliation = COMMONWEALTH EDISON CO.
@@ Line 11: / Line 11: @@
 | contact person =
 | document report number = 6817N, NUDOCS 8307110434
+| title reference date = 04-28-1983
 | package number = ML20079S256
 | document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
@@ Line 67: / Line 68: @@
 : 3. Cable Density I
 No cable tray penetration in a three-hour fire rated wall in Unit 2 or in a three-hour fire rated floor in either unit has a cable density greater than the maximum density tested. The maximum cable pan density tested is 40% for floor penetrations (USG report no.1 and both Transco reports) and 51% for wall penetrations (USG report no.'s 5 and 7). As documented by the S&L letters, no floor-penetration has a cable density greater than 40%, and the maximum density in a Unit 2 wall penetration is 49.1%.
-For your information, the cable pan densi,ty is calculated by dividing the sum of the cross sectional area of the cables by the cross sectional area of the cable pan and multiplying by 100. The attached S&L letter dated June 17, 1983, explains the relationship between the c.ible pan density (CD) and the SAL design' index (DI) for vertical cable riser penetrations. For horizontal cable pan penetrations, the formula is:
+For your information, the cable pan densi,ty is calculated by dividing the sum of the cross sectional area of the cables by the cross sectional area of the cable pan and multiplying by 100. The attached S&L {{letter dated|date=June 17, 1983|text=letter dated June 17, 1983}}, explains the relationship between the c.ible pan density (CD) and the SAL design' index (DI) for vertical cable riser penetrations. For horizontal cable pan penetrations, the formula is:
 CD = (TT/4) 2 X DI X 100 As stated in reference (c), we will furnish our response regarding the Unit I wall penetrations by August 5, 1983.
 : 4. Deviation from Test Configurations The design of all the penetration firestops at LaSalle is verified by the at-tached test reports. The installed penetration seals are either identical or similar to at least one of the penetration configurations that were tested.
@@ Line 83: / Line 84: @@
 The stresses at the side of the test seal are also greater because the hose stream produces a greater bending moment, and the gypsum cement has less surface area to adhere to than in long and narrow type penetrations.
 : b. Floor Penetrations with 12" X 30" Cable Trays Although none of the attached reports describe a test on a penetration firestop with a 12" X 30" cable tray, many of them describe tests on pene-trations with similar or multiple cable trays. USG re documentatestona30"X4"and36"X4"cabletrdy,portno.'s1and4  respectively. The Transco reports describe tests on penetration seals with three and eight cable trays and the sum of the cross sectional area of the cable trays used in each test is greater than the 12" X 30" cable tray. This increases the heat transfer rate and loading of the seal. Thus, the test specimens were subject to a more severe service condition than the field installations can experience.
-: 5. Mixture Control The attached USG letters provide additional information regarding Firecode CT Gypsum Cement. The June 8,1983, letter describes what gypsum cement is, how it is made, what happens when water is mixed with it, and how temperature af-fects it. The other USG letter furnishes additional information on the water-to-plaster ratio and the dry density range. As explained in these letters, the effectiveness of the gypsum cement fire seal is not a function of this ratio or density, it is dependent on the integrity of the seal after it is installed.
+: 5. Mixture Control The attached USG letters provide additional information regarding Firecode CT Gypsum Cement. The {{letter dated|date=June 8, 1983|text=June 8,1983, letter}} describes what gypsum cement is, how it is made, what happens when water is mixed with it, and how temperature af-fects it. The other USG letter furnishes additional information on the water-to-plaster ratio and the dry density range. As explained in these letters, the effectiveness of the gypsum cement fire seal is not a function of this ratio or density, it is dependent on the integrity of the seal after it is installed.
 Therefore, based on the inspection results, we consider the seals to be operable.
 Please note that USG Research Center analyzed a portion of a seal that had been removed and found that its density was within the range of 25 to 30 lbs/ft3.
@@ Line 107: / Line 108: @@
 : 2. Fire Endurance Test on Transco Penetration Seal Systems in a Concrete Floor Utilizing Firecode CT Gypsum Cement dated August 5, 1981.
 C. Letters
-: 1. June 17, 1983, letter from Mr. J.S. Esterman of S&L to Mr. T.E. Watts (SCE-1829).
+: 1. {{letter dated|date=June 17, 1983|text=June 17, 1983, letter}} from Mr. J.S. Esterman of S&L to Mr. T.E. Watts (SCE-1829).
-: 2. June 14, 1983, letter from Mr. J.S. Esterman of S&L to Mr. T.E. Watts (SCE-1827) .
+: 2. {{letter dated|date=June 14, 1983|text=June 14, 1983, letter}} from Mr. J.S. Esterman of S&L to Mr. T.E. Watts (SCE-1827) .
 : 3. June 8,-1983, letter from Mr. R.G. Lange of USG to Mr. E.L. Seckinger.
-: 4. June 3,1983, letter from Mr. R.L. Bartlett of USG to Mr. E.L. Seckinger.
+: 4. {{letter dated|date=June 3, 1983|text=June 3,1983, letter}} from Mr. R.L. Bartlett of USG to Mr. E.L. Seckinger.
 E a
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