ML19340B180

Responds to NRC 801007 & 10 Requests for Addl Info Re Cable Penetration Fire Stops Qualification Tests,Test Suggestions & Kerite Cables.Submits Recommendations for Upgrading Fire Seals.Testing Summary Encl

ML19340B180
Person / Time
Site:	Pilgrim
Issue date:	10/13/1980
From:	Morisi A BOSTON EDISON CO.
To:	Ippolito T Office of Nuclear Reactor Regulation
References
80-253, NUDOCS 8010210618
Download: ML19340B180 (17)

Text

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o BOSTON ECISON COMPANY QENEMAL Orrects 800 SovtaTON STREET BosTO N. M AS S ACNUS ETT5 0 219 9 A. V. M O RIB 1 MANAGER NUCLEAR QPERATIONS SUPPQRT OEPARTMENT BECo Ltr. #80-253 Mr. Thomas A. Ippolito, Chief License No. W -E Operating Reactors Branch #2 Docket No. 50-293 Division of Licensing -

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Connission Cable Peretration Fire Stop Washington, D.C. 20555 Qualification Testing for Pilgrim Nuclear Power Station Unit *1

References:

(a) NRC letter TAC 411077 dated Oct. 7, 1980, T. A. Ippolito (NRC) to A. V. Morisi (BECo)

(b) Conference call between Messrs. T. A. Venkataraman and J. D. Keyes (BECo) and M. Williams (NRC) on 10/10/80 (c) Fire Protection System Review APCSB 9.5-1, dated March 1, 1977 for Pilgrim Station Unit

1. 1 and its Appendix II

Dear Mr. Ippolito:

In accordance with the requests for additicnal information on item 3.1.19 and 3.2.4 of the SER conveyed to BECo per References (a) and (b), we submit the following information on BECo's Cable Penetration fire Stops Qualifi-cation Tests, the recommendations that were concluded at the end of the tests, and additional information on Kerite cables in use at Pilgrim Station.

All penetration fire seals were tested using the time-temperature exposure curve specified by ASTM E-119 using criteria specified in IEEE 634. It is to be noted that BECo's qualification criteria fall in line with the recuiranents that are presently being oursued by the industry and a host of licensees.

Additional information relative to the Kerite cables is provided in Attachment A. We believe this information will satisfy SER requirements on Item 3.2.4.

The following is a summary of cable penetration fire stop testing that was performed for Pilgrim Nuclear Power Station Unit #1. We have detailed the different types of cable penetrations that were tested and qualified in 0Y their as-installed status along with the engineered fixes that were 9 9l qualified for the failed fire seals.

Be1021oQ$

C'.STON EDISQN COMPANY Mr. Thomas A. Ippolito, Chief October 13, 1980 Page Two Based on the results obtained for all the three tests as summarized in at-tachment B to this letter, BECo proposes the following recomendations for upgrading the cable penetratior, fire seals at Pilgrim Station.

1. Wall Penetrations Conduit Sleeves / Cable Trays The As-Built configuration (Reference (c) Sheet II-A4 and II-AS) of conduit sleeves / cable trays that exist at PNPS Unit #1 specified 6 inches of "non-burnin9" Instafoam in the center of the wall thickness. This configuration was tested and qualified in the modified condition as Sleeve #5, Test #2.

Recommendation I

BECo will upgrade all wall conduit / tray sleeves by adding 2" of  ;

Kaowool and I inch of Flamemastic 77 on both sides of the sleeve / tray.

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2. Floor Penetrations A. Floor Blockout

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l Typical floor penetrations that exist at PNPS #1 and as detailed in Reference (c) Sheet II-A3 had 6 inches of Instafoam with 2 inches of Kaowool on both sides. This configuration was tested in its As-Built condition (Sleeve 2 & 4 of Test 2) and did not pass IEEE 634 criteria for acceptance for 3-hour rating. The seals were requalified with fixes (Sleeve 1, Test 2; Sleeve 1, 2 & 4 of Test 1).

Recommendations All floor penetration seals of the above As-built configuration will .

be upgraded to 3-hour rating by providing 1" Flamemastic 77 interposed  !

on top of Kaowool along with a' coating of 1/8" dry Flamemastic to a j length of 3 feet on the Kaowool side of the-penetration. (See Sleeve l

• 1 of Test d2.) '

It is to be noted that the As-Built status of the penetration had the grout side on the floor level. -If the fire in its conservative form is postulated to occur at the penetration location below the floor level on the Kaowool side, Sleeve #2 of Test i establishes that the seal will qualify for 3-_ hour rating. If the fire is postulated at the I

floor level on the grout side (non conservative), the penetration will need upgrading on the Kaowool side as described above.

OC3 TON ' EDISON COMPANY Mr. Thomas A. Ippolito, Chief October 13, 1980 Page. Three B. Vertical Projected Conduit Penetration Typical floor- penetrations that exist at PNPS #1 and as detailed in Reference (c) Sheet II-Al, had 6" of Instafoam with 1" of non-shrinkable grout on the floor side with 2" of Kaowool on the ceiling side below.

Recomenda tione ,

No modifications are recomended to these types of penetration seals. This recomendation is supported by the performance of sleeve #3 and #6 of Test 2 and Sleeve 83 and e6 of Test #1.

C. Vertical Tray Penetrations Typical As-Buil t floor tray penetrations had 6" Instafoam with .1" grout on the floor side and 2" of.Kaowool on the ceiling side below the floor.

The As-Built configuration was tested with fix 2. The fix included l" thick  !

Flamemastic 77 on top of grout, as well as if ' dry Flamemastic 77 over cables in the tray for a length of 3 feet. Tray-l Tes 3 tested with fire on Kaowool side  ;

passed the test criteria. Test results of '. ray-2 of Test #3 supported the post-

'clization that a fire on the grout side could lower the fire seal rating, since  !

the penetration seal failed the IEEE 634 criteria for thermocouple temperatures )

recorded at the Kaowool surface on the cold side. However, an evaluation of l thennocouple readings (#21, #22 and #25) establishes that the test configuratien will rass the IEEE 634 criteria if the penetration seal surface is level with the siab surface.

Recomenda tions BECo will upgrade all tray penetrations by adding 4" of Kaowool to the existing 2" of Kaowool with 1" of Flamemastic 77 added to its final surface.

General BECo has compir.ted an extensive plant survey of all its As-Buil t penetrations for upgrading as well as surveillance purposes. In order to accomplish the l recomended fixes detailed above BECo requests the review and approval of these fixes as mandated by the SER. Upon receiving an approval BECo intends ,

to proceed ahead with the modifications.

1 On a conservative time estimate we have detennined that these fixes can be accomplished by the next refueling outage.

C;5 TON EDISON COMPANY Mr. Thomas A. Ippolito, Chief October 13, 1980 Page Four.-

-If during your review of.the above, you should require additional infonna-tion,please do not hesitate to contact us.

Very truly yours, JK/mam

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Attachments A. Kerite Co., Letter to Boston Edison Company da ted 10/10/80 with attached Test _ Reports. l l

-B. Stone & Webster Co., Letter to Boston Edison Company dated 10/14/80 i with attached " Summary of Cable Penetration Fire Stop Testing for l Pilgrila Unit #1".

ATTACHMENT A 49 Day Street Seymour, Connecticut 06483 (203) 888-2591 o? Y o the kerite company n

t' October 10, 1980 l

1 Mr. Rich Ventakaramen l Boston Edison Company 800 Boylstoa Street l Boston, MA 02199 l j

SUBJECT:

KERITE CABLES PROVIDED FOR PILGRiH #1 NUCLEAR STATION At the request of Mr. Keith Petty, Stone & Webster Engineer-Ing Corporation, we are enclosing copies of IEEE 383 prototype flame tests. Test #77VG65-P covers Kerite SKV non-shielded cables furnished, Test #80VG10-P covers the 600V power cables, and Test #76VG6-C covers the 600V control cables. These tests were performed on cables with the same insulation and jacket ma- I terials as those furnished for Pilgrim Nuclear Station.

This clearly demonstrates the Kerite cables furnished Boston Edison Company for Pilgrim Nuclear Station #1 will not propagate a fire when tested in accordance with IEEE 383 Yours truly, THE KERITE COMPANY

. N. Sleig National Manager l Power Plant Generation j ENS:ss '

Encs, i

1 a subsidiary of HARVEY HUBBELL INCORPORATED Hu u.

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tha kerite company REPORT ON FLAME TEST CONDUCTED ON POWER CABLES 1

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TEST NO. 77 VG 65-P 3 REF.NO. 1G-11/10/77 l 2G-11/10/77  !

3G-11/10/77 I

! November 10, 1977 I

! A. OBJECTIVE The objective of this flame test is to demonstrate that an HTK insulated, HT-l NS jacketed power cable will not propagate a fire.

B. CABLE TESTED  !

j 1/c,1000 kemil, 5 KV,155 mils HTK insulation,125 mLis IITNS jacket.

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[ C. TEST FACILITY

The tests were conducted on November 10,1977 at The Kerite Company Fire  !

Test Facility. An American Gas Furnace Company 10-inch wide ribbon burner was used to provide the flame source. A direct readout Omega Pyrometer was used in conjunction with a thermocouple to monitor flame temperature throughout j the test. A laboratory timer was used to measure the duration of the test. The i test specimen was installed in a 12-inch wide, 3-inch deep,11-foot high, ladder type tray, l

D. TEST PROCEDURE (IEEE 383) )

A single layer of three 8-foot lengths of test cable was mounted in the center l six inches of the tray, allowing a space of one-half cable diameter between cables.  !

The flame source was adjusted so that the temperature was approximately i 1500 F and approximately 15 inches in length. Under dynamic conditions, the j- following manometer readings were recorded for both air and fuel in centimeters of water.

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Air Fuel

, Test No.1 4. 2 2. 7 j

Test No. 2 4. 7 2. 6 1

Test No. 3 4. 8 2. 7 l l

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l tha kerite company Test No. 77 VG 65-P 32 11/iFl7 These pressures,were measured for both air and fuel at the inlet of the mix-er.

The flame source was placed three inches away from the cables and allowed to burn for twenty minutes. At the end of twenty minutes, the flame source was shut off and the cable was allowed to burn until it self-extinguished or was totally consumed. All pertinent data was recorded. The temperatures indicated in the next section were measured by a thermocouple located 2 7/8" from the burner face. The test was performed three times for reproducibility.

E. TEST DATA Test No.1 Test No. 2 Test No. 3

1. Time for specimen to ignite 1 min. 23 sec. 1 min. 32 sec. 1 min.15 sec.

2. Time specimen continued to bum after removal ci flame source 0 sec. 11 min. 1 min. 30 sec.

3. Max. length of sample burned 221/2" 291/2" 25"

4. Minutes Flame Impingement Temperature (OF)

Start 1500 1500 1450 1 1550 1625 1550 2 1400 1550 1450 3 1275 1500 1525 4 1300 1600 1500 5 1350 1650 1425 6 1300 1625 1525 7 1325 1575 1350 8 1350 1700 1350 9 . 1350 1650 1500 10 1325 1650 1500 11 1350 1575 1500 12 1350 1650 1600 13 1350 1675 1575 14 1350 1725 1575 15 1350 1700 1575 16 1350 1650 1550 17 1325 1650 1550 18 1350 1725 1550 19 1350 1625 1600 20 1350 1650 1600 e

th'2 kerite company Test No. 77 VG 65-P

p. 3 11/10/77 F. CONCLUSIONS AND RECOMMENDATIONS This cable shows no evidence of propagating a fire. This type of cable thus qualifies as a fire resistant cable in the context of the IEEE 383-74 specification.

G. ATTESTATION The above test was personally witnessed by the und< algned and the data pre-sented above is accurate and complete to the best of my ,nowledge and belief.

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[/ John V. Osborn JVO/dm V Technician APPROVED hul I

. Basconi, Mechanical Engineer he' Subscribed and sworn to before me this lith day of September,1977.

0nte- l$ll

/ Notary Public

. My Commitsien Expires March 31,1979 i

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- -w- x. . . - - ~ . _ . . . _ _ _ - . ~ . - _ - - -.x m thb kerite company.

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. REPORT ON FLAME TEST CONDUCT D ON POWER CABLE

' TEST NO. 80VG10-P-

, Ref. No. 1G-3-25-802 l 2G-3-25-802 3G-3-25-802 March 25, 1980 A. OBJECTIVE 4

T[ha' objective of this flame test is to demonstrate that an HiK insulated, FR jacketed i . power cable will not propagate a fire. , ,

i l j B. -CABLE TESTED l 1 . ,

! No. 6 AWG Str, 600v, 5' 5 mils, HTK and 65 mils FR Jacket.

C. TEST FACILITY '

, 1 i 'Tha' tests were conducted on March 25, 1980 at The Kerite Company Fire Test Facility.

l An American Gas Furnace Company 10-inch wide ribbon burner was used to provide the fitme source. A direct readout.0mega pyrometer was used in conjunction with a thermo-couple to monitor flame temperature throughout the test. A laboratory timer was used to measure the duration of the test. The test cable was installed in a 12-inch wide,

3-inch deep, 8-foot high ladder type tray In a vertical configuration.  !

l D. TEST PROCEDURE (IEEE 383-1974) l l ' A single layer of 10 8-foot lengths of test cable was mounted in the center six inches j 13f the tray, allowing a space of one-half cable diameter between cables.

Tha flame source was adjusted so that the temperature was approximately 1500 F and cpproximately 15 inches in length. Under dynamic conditions, the following manometer raadings were recorded for both air and fuel in centimeters of water.

Test No. Air Fuel (propane) i 1 I 4.4 2.4 I i 2 4.4 2.4 3  %.4 2.4 Thsse pressures were measured for both air and fuel at the inlet of the mixer.

Th2 flame source was placed 3 Inches away from the cables and allowes to burn for ~

20 minutes. At' the end of 20 minutes, the flame source was shut off and the cable silowed to burn until.it self-extinguished er was totally consumed. All pertinent j data was recorded. .The temperatures indicated in the next section were measured by i e thermov.cuple located 1/8" from the cable samples. The test was performed three times for reproducibility.

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't.h3 kerite conipany Test No. 80VP.10-P March 25, 1980 REPORT ON FLAME TEST CONDUCTED ON POWER CABLE E. TEST DATA Test No. 1 Test No. 2 Test No. 3

1. Time for cable to -

Ignite. 38 sec. 48 sec. 40 sec.

2. Time cable continued to burn after removal of flame source. -

0 sec. O sec. O sec.

3 Damage insulation 33" 36" 38" Jacket 37" 41" 40"

4. Mine es ~

Flame imoingement Temperature ( F)

Start 1500 1500 1500 1 1525 1200 1250 2 1550 1475 1050 3 1550 1475 1550 4 1575 1550 1575 5 1600 1550 1575 6 1625 1500 1500 7 1650 1300 1400 8 1675 1250 1475 9 1675 1350 1500 10 1650 1000 1600 11 1650 1200 1600 12 1650 1350 1400 13 1650 1275 1650 14 1675 1200 1550 15 1700 1000 1500 16 1650 1250 1600 17 1700 1425 1500 18 1725 1050 1525 19 1750 1250 1600 20 1675 1075 1575 F. CONCLUSION This c:ble shows no evi.'ence of propagating a fire. This type of cable thus qualifies as a- fire resistant cable in the context of the IEEE 383-1974 speci-fication.

4 Tcst No. 8"'G10-P t,ha kerite company March 25, 1980 REPORT ON FLAME TEST CONDUCTED ON POWER CABLE G. ATTESTATION i

The above test was personally witnessed by the undersigned and the test data presented cbove is accurate and complete to the best of my knowledge and belief. ,

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wh 0 %w JV0:1dh // John V. Osborn V Technician APPROVED BY: ,b- ((USv S.F. Mauser Manager, Product Development l

l Subscribed ano sworn to befort .ne this 25th day of March,1980.

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[ Notary Public t/ CSE: d

• E4pires Merch 31,1734

emp Narem couwury REPORT ON FLAME TEST CONDUCTED ON CONTROL CABLES February 3,1976 Test No. 76 VG 6-C Ref. No. 1G-2-3-76 2G-2-3-76 ;

3G-2-3-76 i A. OBJECTIVE 1

The objective of this flame test is to demonstrate that an FR insulated, FR l jacketed, control cable will not propagate a fire.

B. CABLE TESTED Seven conductor No.12 (19 strand), 600 volt, 40 mils FR (HI-70) insulation, 65 mils FR (HC-711) jacket.

C. TEST FACILrfY The tests were conducted on February 3,1976 at The Kerite Company Fire Test Facility. An American Gas Furnace Company 10 inch wide ribbon burner was used to provide the flame source. A direct readout Doric Multi-Point Temperature Recorder was u.ed in conjunction with the thermocouple to monitor flame temperature throughout the test. A laboratory timer was used to measure the duration of the test. The test specimen was installed in a 12 inch wide, 3 inch deep,11 foot high ladder type tray.

D. TEST PROCEDURE (IEEE 383-1974)

A single layer of six 8 foot lengths of test cable was mounted in the center six inches of the tray, allowing a space of one-half cable diameter between cables.

The flame source was adjusted so that the temperature was approximately 15000F. and approximately 15 inches in length. Under dynamic conditions the folicwing manometer readings were recorded for both air and fuel in centi-me.te. s of water.

Air Fuel Test No.1 4. 6 2. 6 Test No. 2 4. 7 2. 8 Test No. 3 4. 4 2. 4 e

____.-c~ ----.q ,._ .r e m .~:. _ . .*e-- ---

Tud N mxTm couramv Test No. 76 VG 6-C Pg. 2

. s These pressures were measured for both air and fuel at the inlet of the

. mixer. .

The flame source was placed three inches away from the cables and al-lowed to burn for twenty minutes. At the end of twenty minutes the flame source was shut off and the cable was allowed to burn until it self-extinguished or was totally consumed. All pertinent data was recorded. The temperatures indicated in the next section were measured by a thermocouple located 2 7A" from the burner face. The test was performed three times for reproducibility.

E. TEST DATA Test No.1 Test No. 2 Test No. 3

1. Time for specimen to ignite - 28 sec. 29 sec. 30 sec.

2. Time specimen continued to burn after removal of flame source - 25 sec. O sec. O sec.

3. Max. length of sample burned - 23" 29" 29"

4. Minutes Flame Impingement Temperature ( F.)

Start 1490 1457 1486 1 1324 1334 1333 2 -

1359 1283 1270 3 1275 1197 1180 4 1258 1139 1148 i 5 1226 1149 1192 6 1263 1207 1285 7 1253 1144 1434 8 1239 1207 1376 9 1302 1274 1253 10 1244 1249 ~1102 11 1306 1215 1143 12 1287 1195 1231 13 1257 1161 1271 14 1252 1130 1246 15 1224 1126 1258 16 1220 1126 1265 17 1225 1130 1241 18- 1223 1135 1189 19 1226 1146 1191

, 20 1233 1139 1201

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Test No. 76 VG 6-C Pg.3 F. CONCLUSIONS AND RECOMMENDATIONS This cable shows no evidence of propagating a fire. This type of cable, thus, qualifies as a fire resistant cable in the context of the test configuration.

G. ATTESTATION -

The above test was personally witnessed by the undersigned and the data presented above is accurate and complete to the best of my knowledge and be- ,

lief. l

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// ' John Osborn i

(/ Technician l APPROVED BY <

Paul D. Basconi, Mechanical Engineer ,

Subscribed and sworn to before me this 4th day of February,1976.

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Gw MIL Notary Public g/

My Cc: .eien sp;res 14 arch 41.1979 JO/dm

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-Stsne & Kabstrr Engin;sring Corporation October 14, 1980 ATTACHMENT B J.O. No. 13201 SUW.ARY OF CABLE FENETRATICN FIRE STOP TEST 2fG FCR FILCRIM 1

-The cable . penetration fire stops were tested by Franklin Institute. The results are reported in 7-C5159-1, F-C3159-2, F-C5159-3.

The different types of penetrations existing in the . station and which were repre-sented in the test are as follows:

A. Vertical penetration - 6" diaceter circular blockout.

B. Vertical penetration - E= bedded conduit projecting from both sides of floor.

C. Horizontal penetration - Ecbedded conduit projecting from both sides of wall.

D. Vertical / horizontal opening with tray projecting from both sides of floor / wall.

Table 1, attached, presents a checklist as to which penetrr. tion style is represented by the various test penetrations. A pass / fail indication is included in Table 1 The pass / fail criteria is as described in IEEE 634/1978.

DISCUSSICN OF VARIOUS PENETRATIO" STYLES 1 -Panatration Stvla A In Test 1 the original design of the penetration was tested with a ccating of 1/8" dry Flace=astic 77 on the outside of the cable bundles. Saeed on the code of failure of s1v. 5 in Test 1, a 1" wet coating of Flame-mastic 77 was applied to the surface of the Kaewcol and retested (siv.1 -

Tesg 2). This design passed with the maximum back-side te=perature of 585 F.

The test-results of s1v.1, 2, 4, 5 of Test 1, indicate that the worst case conditions are maxi =um cablo fill with the fire impinging in the direction as indicated in siv. 4 of Test 1 For the situations who-9 thermoset' ting cables are used, it is recommended that the cables on the Kaowool side be coatei en the outside with 1/8" dry Fla=emastic 77 for a length of three feet.

2. Penetration Stvle B '

This penetration design when tested vith thermo's etting cables passed.

See siv. 3, 6 - Test 1, and siv. 3, 6 -' Test

• for results.

Siv. 2, . 4 - Test 2 (penetration style " A") and siv. 3, 6 - Test 2 (pene-tration style "B") both used thermosetting cablen with r.axinum cable fill.

Gince the penetratica style B passed but style A failed, we conclude style

I 1

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2 B is inherently superior to style A. For this reason if thermoplastic 1

I cables are used in style -B penetration, only a surface coating of 1/8" dry Fla=emastic 77 on the cables will be needed.

3. Penetration Style C

"*he penetration design was tested with Kaowool and a 1" wet coating of Flamemastic 77 on both surfaces. This design is ry==etrical and tested with raximu= c_able fill, and therefore did.not require additional testing.

If thermoplastic cables coated with Flace=astic 77 are used in lieu of the thermosetting type cable which m re in the test, the performance of the penetration is not expected to change significantly.

4. - Dr:etration Style D The tested penetration design incorporated a todification on the grout side only of a) 1" Flamenastic 77 on penetration surface and b) 1/8" Flanerastic 77 coating on cable surface. The design was asymmetrical and was tested in both directions (Tray 1 and Tray 2 - Test 3). Failure occurred on Tray-2 which had fire impinging on the grout side. The fail-ure occurred where the thermocouples were located 5" down from the top i of the concrete but still on the surface of the penetratien. The ther:o-l cougles reading temperatures at the concreto level were all less than i 300 F. If 4" of Kaowool and 1" vet Flacemastic 77 on penetration surface I i were added cpposite the greut side, the aximum backside te=rerature would be well below the failure criteria.

It should be noted that Tray 1 represents the actual position of plant l installation, i.e. grout side of penetration up.

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TABT2 1 BRIEF DESCRIPTIO!! OF TEST SL72VP.S/ TRAYS A!!D IIESTII,TS ORIGINAL DESIGi ORIGINAL DESIGN PMIETRATION- ORIGIt!AL WITI! P.0DIFICATIOri WITil NODIFICATION STYIE DESIG'I aAa a n's

'.A Slv. 2, Test 2 - Fail S1v.1, Test 1 - Pass 'S1v. 1, Test 2 - Pass Sly.. 4, Test 2 - Fall S1v. 2, Test 1 - Pass Slv. 4, Test 1 - Pass Sle. 5, Test 1 - Fail D Slv. 3, Test.1 - Pass Not Applicable Not' Applicable Slv. 6, Test 1 - Pass

-Sly. 3, Test 2 - Pass

. S1v. 6, Test 2 - Pass

-G Not Tested Not Applicable Slv. 5, Test 2 - Pass D Not Tested Not Applicable Tray 1, Test 3 - Pass Tray 2, Test 3 - Fail 9

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