ML19263C073

Fire Retardant Cable Test,June-Sept 1977,R&D Project.

ML19263C073
Person / Time
Site:	Crystal River
Issue date:	06/09/1977
From:	Gaker K, Shook D FLORIDA POWER CORP.
To:
Shared Package
ML19263C072	List: ML19263C071 ML19263C073
References
NUDOCS 7902020271
Download: ML19263C073 (23)

Text

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FIRE RETARDAtiT CABLE TEST JUNE 6 through June 9,1977 RESEARCH & DEVELOPiENT PROJECT By D.A. Shook Test witnessed by D A lu D.A. Shook K. 8 b K.B. Baker 790202027/'

INDEX I. PURPOSE

a. Perform fire test per IEEE 383 (65,000 BTU per hour burner)

b. Perform fire test per IEEE 383 except tray visually full, for Control & Instrucentation Cable II. SCOPE Verify flame retardant characteristics of Crystal River No. 3 Cable.

III. TEST REQUIREMENTS IV. CRYSTAL RIVER #3 RESULTS

a. Rockbestos cable type EK-24A, an equivalent EK-35B and Firewall III using test No. 6, 7, 8, 10 and 11.

b. Kerite cable type EK-KL, 18E and 12F using test No. 1, 2, 3, ,

and 9.

c. Continental Wire and Cable type EK-33B using test No. 5 and 12.

d. Problems with cable type EK-24A test No. 6 and 10.

e. Full tray test versus middle 6" filled with half cable spacing per IEEE 383

f. Data Sheets.

I. PURPOSE

a. Fire Tests were performed in accordance with the existing standard IEEE 383 using a 65,000 BTU per hour burner. These tests were performed to establish a clear understanding of existing standards and also to observe the actual results of this standard using the Crystal River No. 3 cable.

b. Presently IEEE 383 calls for a test using only the center portion of a ladder type tray with cables installed on a half diameter spacing. Very few cable installations within our generating facilities are actually in this order. 'a'e have many cable tray installations where the : ables visually fill the tray or approximate this fill. Tests were performed on trays that were visually filled in order to establish whether this was a more severe test or not.

II. SCOPE

a. We have recently received questions from the Nuclear Regulatory Cocaission on the flame retardancy of cables installed for Crystal River Unit No. 3. These questions are a result of the Browns Ferry incident and have been expected by Florida Power Corporation. Cable tests were performed using cable from Crystal River Unit No. 3 in order to establish a further data base in answering these NRC questions and future questions.

b. The results and comparisons of these tests are to be used in order to establish minicum flame retardant properties to be included in Florida Power Corporation cable specifications. This data would also be used to provide a cocparisen of future vendors requesting to be added to our Bidders List. Cable Fla=e tests are performed in various methods and also using various tets. We would be comparing our vendors by the same criteria for each and every vendor.

III. TEST REQUIRESENTS Flace Tests are to be performed on cables furnished by Florida Power Corporation. The Tests are to be done in accordance with IEEE 383-1974 The flame source shall be a ribbon gas burner with location and fuel in accordance with IEEE-383-1974. Variations to IEEE-383-1974, will be an additional test with tray visually 100% full of Instrument and Control Cable. Cables shall be tied at the top with cetal ties and as needed elsewhere with nylon ties. Tray shall be a ladder type tray with 9" rung spacing.

TEST SAMPLE APALNGESENT "A" Multiple lengths of cable should be arranged in a single layer filling at least the center six inch portion of the tray, with a separation of approxicately 1/2 the cable diameter between each cable. See attached sketch.

TEST SAMPLE ARPANGE!ENT "B" Multiple lengths of cable should be arranged such that the cable tray appears to be 100% full. Cables shall be arranged per attached sketch.

TEST SAMPLE ARRANGE!ENT "C" Multiple lengths of cable should be arranged such that the cable tray contains two layers of cable with no apparent space between cables.

See attached sketch.

FLAliI SOURCE 65,000 BTU /hr flame using a ribbon burner.

TEST SEQUENCE

1) Cable description sheet shall be filled out.

2) Cable installed in trays in accordance with arrangement selected.

3) Flame shall be applied using the flame source selected.

4) Flame source shall be applied for 20 cinutes with the impingenent flace temperature conitored and recorded.

5) Visual characteristic of the burning shall be observed and documented.

6) After source flame is removed, the flame shall not be extinguished but allowed to burn.

7) After the flame is out. (Glow of conductors is not considered a flame). The following data shall be taken.

ACTUAL FUEL USED FLAME SOURCE TIME AFTER BURN TIME BURN LENGTH SELF EXTINGUISHING VISUAL COliMENTS Cables which propagate the fla=e and burn the total height of the tray above the flame source fail the test. Cables which self extinguish when the flame source is removed or burn out, pass the test. Cables which continue to burn after the flame source is shut off should be allowed to burn in order to determine the extent.

See attached table for test to be pe rf o rced.

CABLE DESCRIPTI0ti TEST f40.

1) CoriDUCTOR PATERIAL SIZE STRAtiDING__ C0ATItiG

2) INSULATIO!4 PATERIAL THICKriESS

3) ASSEMBLY

4) SHIELDING

5) COVERING JACKET MATERIAL THICKNESS

6) CHAPACTERISTICS VOLTAGE TEMPERATURE RATI!1G

7) IDENTIFICATION MANUFACTURE

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X = 1/2 CABLE O.D.

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12"  :

SECTION A- A ARRANGEMENT 'A'

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12" SECTION A-A ARRANGEMENT 'B'

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SECTION A-A ARRANGEMENT 'C'

TEST TEST S AMP LE CABLE CABLE DESCRIPTION NO. ARRANG. .SBTF.

1 A Kerite EK-KL-3/c #4 with ground - 60 f t.

2 3 Kerite EK-KL-3/c F4 with grounds - 500 ft.

3 A Kerite EK-18E-5/c F14 - 105 ft.

4 C Kerite EK-18E-5/c F14 - 1500 ft.

5 A CWC EK-35B-3/c v16 -

180 ft. silicone rubber 6 A Rockbestos EK-24A-F16 fron-constantan 180 ft. silicone rubber 7 A Rockbestos Firewall III - 2/c #16 - 105 ft.

8 A Rockbestos Firewall III - 5/c !!14 - 135 f t.

9 A Kerite EK-12F 3/c #6 W/ Interlock - 60 ft.

10 A Rockbestos EK-24A-#16 iron-constantan Silienna rubber - 180 ft.

11 A Rockbestos 3/c F16 Equivalent to EK-35B -

Silicone Rubber - 180 ft.

12 A CWC EK-35B - 3/c 16 - 180 ft. Silicone Rubber

. IV. RESULTS

a. We tested cable manufactured by the Rockbestos Company known as our type EK-24A and Rockbestos type Firewall III. In all cases the Firewall III passed the tests. The insulation of Firewall III immediately extinguishes upon removal of the flame. This cable has excellent fire retardant characteristics.

The silicone rubber cable, Item EK-24A, manufactured by the Rock 5estos Company did not pass the flame test. This will be further dis-cussed in Section D of this report.

b. Cable manufactured by the Kerite Company, known as our types EK-KL, 18E, 12F, were tested using various configurations and types of cable. All Kerite cable tested successfully passed all tests independent of the configuration used. The Kerite insu-lation on removal of the source flame, extinguished all visible flame. There appeared many times a glowing coal configuration at the very bottom of the burn area. This would continue to char the cable for approxi=ately, an additional 1-1/2 to 4". At no time was flame reestablished on the same due to the charred area.

This is an acceptable characteristic and, therefore, the cable did pass. On performing the test for lEEE 383 on Kerite Inter-locked Armor with the center portion filled on half cable diameter spacing, the sample continued to burn and had an afterburn time of 1 minute and 13 seconds. After that period of time the cable was fully extinguished. This is an acceptable criteria and the cable passed the test.

c. Tests were performed on Continental Wire & Cable Company cable type EK-35B. This cable was a three-conductor, #16 instrumentation cable with silicone rubber insulation. The cable successfully passed each test and there were no problems.

d. Tests Nos. 6 and 10 were performed on Rockbestos Company siliconc rubber-insulated cable. The test showed the flame burned completely to the top of the tray. When testing, the flame reached the top of the tray before the burn time was completed and, therefore, the cable failed. We have approximately 110,380 feet of this cable in-stalled at Crystal River Unit No. 3, which is approximately 2-1/2 percent of all cable installed at Crystal River No. 3. We are presently having further discussions with the Rockbestos Company as it appears they manufacture a flame retardant and a non-flame retardant silicone rubber. In the future, we must ensure that all silicone rubber furnished is flame retardant. Because of the very small quantity of cable installed in CR-3, it should be no problem at this time.

This cable installed is not in any one spot but spread throughout the plant.

At a later test pe rfor=ed November 21, 1977, an equivalent EK-35B was manufactured by Rockbestos using a Silicone Rubber Jacket Test #12. This cable passed the test.

e. In comparing the test performed using a full tray or the center half-spacing filled tray, single-layered, it is of much interest to note that a full tray is not the most severe test. A full t ray or a one or two-layered tray, as was exhibited in Test No.

4, acts like a wall to the burner flame. After a short period time and a little charring, this wall seals itself fairly well and no flames penetrate. As shown in Test No. 4, this second layer was not burned but only slightly blistered on the outside edge of the jacket. 'Je should be specifying in the future to cemply with the center portion of the cabic tray filled on half-dia=eter spacings.

f. Attached are the actual data sheets.

Schmiedel (Index)

CABLE DESCRIPTION TEST NO. I

1) CONDUCTOR MATERIAL copper SIZE 3/c !4 w/ grounds STRANDING 7 C0ATING tinned

2. INSULATION MATERIAL HT KERITE THICKNESS 65 mils

3. ASSEMBLY EK-KL, FR Kerite Jacket (124 mils), binding tape, 3 asbestos fillers with 3 -8 AWG tinned copper - 7 strand ground wires, 3 conductors

-? AW3-tinned copper-7 strands with H.T. Kerite insulation (65 mils).

4. SHIELDIN3 None

5. COVERING JACKET MATERIAL FR KERITE 124 mils THICKNESS

6. CHARACTERISTICS 600V 93 C VOLTAGE TEMPERATURE RATING

7. IDENTIFICATION MANUFACTURE Kerite

8. After the flare is out. (Glow of conductors is not considered a flame).

The following data shall be taken.

ACTUAL FUEL USED 69,630 BTU /hr FLAME SOURCE TIME 20 min.

AFTER BURN TIME None BURN LENGTH 37" SELF EXTIN3UISHING yes VISUAL COM"ENTS normal burn, asbestos fillers & taoes did not barn.

CABLE DESCRIPT10ff TEST N0. 2

1) COND'JCTOR copper SIZE 3/c #4 with grounds MATERIAL 7 C0ATING tinned STRANDING

2. INSULATIOf{

MATERIAL HT Kerite THICKNESS 65 mil _s

3. ASSEMBLY _

EK-KL, FR Kerite jacket (124 mils), binding tape, 3 asbestos fillers with 3 #8 AWG tinned copper, 7 strand ground wires, 3 conductors #4 AWG - tinned copper - 7 strands with H.T. Kerite insulation (65 mils).

4. SHIELPiriG

.ioi =

5. COVERItiG FR Kerite THICKNESS 124 mils JACKET MATERIAL

5. CHARACTERISTICS 600 V TEMPERATURE RATlf4G 90 C VOLTAGE

7. IDENTIFICATIO_N MAfiUFACTURE Kerite

8. After the flame is out. (Glow of conductors is not considered a flame).

The following data shall be taken.

62,301 BTU /hr ACTUAL FUEL USED FLAME SOURCE TIME 20 min AFTER BURN TIME fione BURii LEtiGTH 30" SELF EXIINSUISHIriG YesLess visual ourning than test No.1, flane did not penetrate to front. Only 50% of 1st layer burned. No flame damage to VISUAL COM:1ENTS tne otner two layers.

CABLE DESCRIPTION TEST NO. 3

1) CONDUCTOR _

MATERIAL copper SIZE 5/c #14 STRANDING 7 C0ATING tinned

2. INSULATION MATERIAL HT Kerite THICKNESS 52 mils

3. ASSEMBLY _

EK-18E, FR Kertie jacket (83 mils), binding tape, 5 single conductors

1. 14 AWG tinned copper, 7 strand with HT Kerite insulation (52 mils) and a center asbestos filler

4. SHIELDING None

5. COVERING JACKET MATERIAL FR Kerite THICKNESS 83 mils

6. CHARACTERISTICS 600 V TEMPERATURE RATING 90 C VOLTAGE

7. IDENTIFICATION MANUFACTURE Kerite

8. After tne flame is out. (Glow of conductors is not considered a flame).

The following data shall be taken.

ACTUAL FUEL USED 64,130 STU/hr FLAME SOURCE TIME 20 min.

AFTER BURN TIME 0 BURN LENGTH 41" SELF EXTIN3U15HING Yes VISUAL C0liENTS more smoke, streamer flames, internal cooking for 3" more connaara arter Tlace source renoved.

~

CABLE DESCRIPT10li 4

TEST NO.

1) CONDUCTOR l'ATERIAL copper SIZE 5/c =14 7

C0ATING tinned STPANDING

2. INSULATION HT Kerite THICKNESS 52 mils IGTERIAL

3. ASSEMBLY _

EK-18E, FR Kertie jacket, (83 mils), binding tape, 5 single conductors

1. 14 AWG tinned copper, 7 strand with HT Kerite insulation (52 mils) and and a center asbestos filler

4. SHIELDING None

5. COVERING JACKET MATERIAL FR Kerite THICKNESS 83 mils

6. CHARACTERISTICS VOLTAGE 600 V TEMPERATURE PATING 90"C __

7. IDENTIFICATION MANUFACTURE Kerite

8. After the flame is out. (Glow of conductors is not considered a flame).

The following data shall be taken.

ACTUAL FUEL USED 63,828 FLAME SOURCE TIME 20 min AFTER BURii TIME 95 sec BURN LENGTH 70" SELF EXTINGUISHlfiG yes more smoke than smaller flame, all the fuel in flamearea was not VISUAL CDP.M. Erit 5 consumed and therefore an after burn occurred - 5 cables dropped from top.

CABLE DES _CRIPTION 5

TEST !J0. _

1) C0t;DUCTOR PATERIAL copper SIZE 3/c #16 7 C0ATIt;G tinned STPAtiDI!iG

2. I tiSUL ATIO_ti SR THICKf;ESS 26 mils

%TERIAL

3. ASSEMBLY _

EK-358, SR jacket (51 mils), aluminum / mylar tape (2-1/2 mils), =18 tinned copper, 7 strand drain wire, mylar tape (1 mil), 3 single conductors 16 AWG tinned copper, 7 strand with asbestos braid and SR insulation (26 mil) 4 SHIELDifi3 Yes

5. COVERIriG SR THICKliESS 51 mils JACKET MATERIAL

6. CHARACTERISTICS 600V TEMPERATURE RATit;G 90 C VOLTAGE

7. IDENTIFICATI0f4 CWC MAliUFACTURE

8. After the flame is out. (Glow of conductors is not considered a flame).

The following data snall be taken.

62,300 STU/HR ACTUAL FUEL USED 20 min FLA!'E SOURCE TIME r;one AFTER BURfi TIME 42" BUR *i LEfiGTH SELF EXTI;GUISHlii3 Ye5 Licht smoke, heavy particles, second level of flame VISUAL C01:".EliTS established abova name source.

CABLE DESCRIPTION _

TEST NO. f'

1) CONDUCIOR iron constantan SIZE #16 VATERIAL STRANDING solid C0ATING none

2. INSULATION VATERIAL SR THICKNESS 30 mils

3. ASSEMBLY _

EK-24A, SR jacket (45 mils), mylar tape (1 mil), nylar/ aluminum tape (2 mils),

=18 A'a'G-tinned copper drain wire, 2 conductors - solid iron - constantan 5R insulation (30 mils) - asbestos sheath and one asbestos filler

4. SHIELDING Yes

5. COVERING SR THICKNESS 45 mils JACKET MATERIAL

6. CHARACTERISTIC 5_

600V TEMPERATURE RATING 90 C VOLTAGE

7. :DEtiTIFICATION MANUFACTURE Rockbestos

8. After tne flame is out. (Glow of conductors is not considered a flame).

Tne following data shall be taken.

62,301 BTU /HR ACTUAL FUEL USED FLAME SOURCE T;ME 20 min AFTER BURN TIME None BUR, LENGTH 76" SELF EXT!NGUISHING Second level of burning above source flame. This propagated to tr V:5UAL COMMENTS too runo. Burnino last 13 min. It appeared that the fire s:c::e the last tray rung. To be retested, see test = 10

~

CABLE DESCRIPTION 7

TEST NO.

1) CONDUrl0R MATERIAL copper SIZE2 /c #16 7

STRAriDING C0ATING _ tinned

2. INSULATION MATERIAL X-link THICKNESS 33 mils

3. ASSEMBLY Firewall III (2/c #16),1:eoprene jacket (52 mils), asbestos mylar tace (5 mils),

=18 AWG solid tinned copper drain wire, aluminum / mylar tape (2-1/2 mils),

2 =16 AWG tinned copper, 7 strand conductors with xlink insulation (33 mils).

4. SHIELDIf;G Yes

5. COVERING Neoprene THICKNESS 52 mils JACKET MATERIAL

6. CHARACTERISTICS 600 V TEMPERATURE RATING 90 C VOLTAGE

7. IDENTIFICATION R ckbestos MANUFACTURE

8. Af ter the flame is out. (Glow of conductors is not considered a flame).

The following data shall be taken.

69,631 STU/HR ACTUAL FUEL USED FLAME SOURCE TIME 20 min AFTER BURN TIME none BURN LEtiGTH 26" SELF E).TINGUISHING yes Fuel consurea, no major flame after 10 minutes of burning VISUAL C0".MENTS time.

- CABLE DESCRIPTION TEST NO. 8 l) CONDUCTOR MATERIAL copper SIZE 5/c #14 STRANDING 7 COATING tinned

2. INSULATION X-link THICKNESS 33 mils MATERIAL

3. ASSEMBLY Firewall III (5/c #14), Neoprene jacket (35 mils), asbestos mylar tape (6 mils), 5 non-hygroscopic fillers and 5 single conductors #14 AWG -

tinned copper - 7 strands, with X-link insulation (33 mils), non-hygroscopic inner filler 4 SHIELDING Nona

5. COVERING JACKET MATERIAL THICKNESS

6. CHARACTERIS TICS VOLTAGE 600V TEMPERATURE RATING 90 C

7. IDENTIFICATION MANUFACTURE Rockbestos ___

8. Af ter the flame is out. (Glow of conductors is not. considered a flame).

The following data shall be taken.

ACTUAL FUEL USED 63,350 BTU /HR FLAME SOURCE TIME 20 min AFTER BURN TIME None BURN LENGTH 27" SELF EXTINGUISHING yys VISUAL COMMENTS white layer

CABLE DESCRIPTION TEST NO. 9

1) CONDUCTOR MATERIAL cnnnor SIZE 3/c e6 STRANDING 7

C0ATING tinned

2. INSULATION MATERIAL HT Kerite THICKNESS 65 mils

3. ASSEMBLY EK-12F, calvanized interlock armor, FR Kerite jacket (80 mils), 3 asbestos fillers with 3 conductors #6 A'AG - tinned copper - 7 stand with HT Kerite insulation (65 mils)

4. SHIELDINS None

5. COVERING JACKET MATERIAL FR Kerite THICKNESS 80 mils

6. CHARACTERISTICS VOLTAGE 600V TEMPERATURE RATING 90 C

7. IDENTIFICATION MANUFACTURE Kerite

8. After the flame is out. (Glow of conductors is not considered a flame).

The following data shall be taken.

ACTUAL FUEL USED 66,603 BTU /HR FLAME SOURCE TIME 20 min AFTER BURN TIME 1 min 13 sec BURN LEN3TH 48" SELF EXTINGUISHING yes Flame streamers coming out of interlock.

VISUAL C0:O*ENTS Interlock did not secarate.

CABLE DESCRIPTION TEST NO. 10 REPEAT OF TEST # 6

1) CONDUCTOR MATERIAL iron-constantan SIZE #16 STRANDING solid COATING none

2. INSULATION MATERIAL SR THICKNESS 30 mils

3. ASSEMBLY EK-24A SR jacket (45 mils), mylar tape (1 mil), mylar / aluminum taoe (2 mils),

=18 AWG-tinned copper drain wire, 2 conductors - solid iron constantan 5R insulation (30 mils) - asbestos sheath and one asbestos filler

4. SHIELDING Yes

5. COVERING JACKET MATERIAL SR THICKNESS 45 mils

6. CHARACTERISTICS V0LTAGE 600V TEMPERATURE RATING onor

7. IDENTIFICAT10ti MANUFACTURE Rockbestos

8. Af ter the flame is out. (Glow of conductors is not considered a flame).

The following data shall be taken.

ACTUAL FUEL USED 65.966 BTU /HR FLAME SOURCE TIME 20 min AFTER BURN TIME none BURN LENGTH full heiaht SELF EXTINGUISHING No Retest witn extra Toot of cable. Flame again went to top VISUAL COMMENTS rung, thus failed the test 8' mark.

CABLE DESCRIPTI0ri TEST NO. 11

1. CONDUCTOR MATERIAL copper SIZE 3/c #16 STRANDING 7 C0ATING __

tinned

2. INSULATION MATERIAL SR THICKNESS 26 mils

3. ASSEMBLY SR jacket, (55 mils), aluninum/ mylar tape (2-1/2 mils), -18 tinned copper, 7 strand drain wire, mylar tape (1 mil), 3 single conductors, =16 AWG -

tinned copper, 7 strand with asbestos braid and SR insulation (26 mils)

4. SHIELDING Yes

5. COVERING JACKET l ATERIAL SR THICKNESS 55 mils

6. CHARACTERISTICS VOLTAGE 600V TEMPERATURE RATING 90 C

7. IDENTIFICATION MANUFACTURE Rockbestos

8. After the flame is out (glow of conductors is not considered a flame), the following data shall be taken:

ACTUAL FUEL USED 70,000 STU/HR FLAME SOURCE TIME 20 min AFTER EURii TIME None BURN LENSTH 34" SELF EXIINSUISHItiG Yes VISUAL CO.". MENT Light snoke, second level of flame established above fla-e source.

TEST NO. 12 CABLE DESCRIPTION

1. CONDUCTOR _

MATERIAL copper SIZE 3/c =16 7 C0ATING tinned STRANDING

2. INSULATION l'ATERI AL SR THICKNESS 25 mils

3. A S S E.BLY Ek-35B, SR jacket (57 mils), aluminum / mylar tape (2-1/2 mils), =18 tinned copper, 7 strand drain wire, mylar tape (1 mil), 3 single conductors =16 AL.'G tinned copper, 7 strand with asbestos braid and SR insulation (25 mils)

4. SHIELDING Yes __ _

5. COVERING JACKET MATERIAL SR THICKNESS 57 mils

6. CHARACTERISTICS VOLTAGE 600 V TEMPERATURE RATING 90 C

7. IDENTIFICATION MANUFACTURE CWC

8. Af ter the flame is out (glow of conductors is not considered a flane), the following data shall be taken:

ACTUAL FUEL USED 70,000 BTU /HR FLAME SOURCE TIME 20 min AFTER B"RN TIME None BURN LENGTH 24" SELF EXTINGUISHING Yes VISUAL C0:' MENT Light smoke, second level of flame established above flame source.