ML20197J384

Evaluation of Sealants for Prevention of Soaking of Flammable Liquids Into Kaowol Blanket Wrap Around Cable Trays During Complete Equipment Fires

ML20197J384
Person / Time
Site:	Farley
Issue date:	01/05/1978
From:	Chaille C BECHTEL CORP.
To:
Shared Package
ML20197J055	List: ML20197J050 ML20197J075 ML20197J384
References
NUDOCS 9812150062
Download: ML20197J384 (35)

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'* - u= - ~ p p%i.g. ,aw c . $.. l,;,.~+ ~ r,..ums w. i. g... EVAIAJAT!0N, P,.St!AtJutr5 POR,.PMYIJiT10N!0F. 40AKING OF FLAWBLtuassa 3.,'..- fpf r1,1 QUID 8TfiffD.EA0WO0t? BLANKET $RAPIANDUND'CABLETR4Y5 Ts ~

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(DURIMPCIWP ENGulJ9Cff FIRES::. eww am a;.r. *;' m$pE'- y;;. My y:. ; . :. A[$,f.i., *.,, .6 c

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ness.. F@M.?'N.Varv:u:nd sahle;'trfysiintfjendsit,is,%imi3Yohlossiksve' ar Ma Ite t'ho cables la case of a ~ 5 kkN. d':fcomplet6 'oWgulfmon't'JfircMiknierbrp[trafs,0{liil hi?.4vont of a flamashle liq b ~l$ ness.of/theiwrap.f6fivertisalicable t N,p;,(/:t.'throdsh.the KaosooQb'IsnEstgif'aff16.protectKDiablo ' tray, the 11 aul spill.on the floorJn6 sad.(th4 Stical': ~ [:Musing: the:'.flammablarliqul'd.-as:s*Tesdium causisgidamage.to the cables.'. In order %fise'stant'stahdad'the'The?efsh.w$'rijpe.. cab 1'l.ph fo'ruisd/evatust to p'revint'thisifr65foccurrinj; 1 Wit ' fu t e tri' to'pWvent the soaking of f 3 [h.lammable liquids finto:th'e' Knowoolf blankst(during'a' comp'!ste engulfment fire. f i.y !?..y : x s.y.g;;;".c '.Q;;. a ..s e :.c > .#gg yJ t.g.g i. . O...... s. c,... y. s,s.. MATERIAL.S AND EQUIPDCff"> ? ..e. .m c. ..... m. p.- gg. 9. p .'i

• ' A list of.,the matorialsland equ!pment used in.this Investigation is shown

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c"., .d A M.'g n, Table !.- yy.6.:.:#...- k'%,.8CT,'EgIPERIMarrAL PROCEDURES..

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o,t. ...s .M.M yd.;#. u? ;Throo fire tests woro performed using a flammable liquid poured around a

irt, vo'rtical tray wrapped with Knowool h!anket. A steel pan was fabricated to contala MG' ".O the 11(u.!d and hold theftray!!n s'. vertical position. Ansics were bolted to the to. hold the' tray.cfiraly. A photograph of the pan with.the tray

[,f.b' ttos.pf the pan,in figu, rey sN,.. w f o !?in' laco is shown pt.M Tf.YdN.3 *. h?.*i.d.s:5.Wr.MA !)M(~ts thefcablo': tray.was. filled with bulk cotton to S P

$4 fd In fall.tihreee.firo.tes 1fiuid.penitrated In'ths,first,iest icatWjif:..the;.b'urninY U* the?Knowool wrap.ireariditbejcableQt'rshwa.the Knowool,blankst.

t s thei same' as in the test' af Underwriterp r . kw.aborat' ries:'on' September' 8#1978.W.One3nch 'of'Knowool blanket Q4 inche ?. .f a e i Vith:fons*4n'ch',blankat'.'j,(7he;trahirsj). wrapped

• to. a., height of four. feet',wi Wit?j a!EtjtsoNee t/,fros;the iflooM!

.four'.' isch' wide belt of. EssGool sas'w'rsppe'd "a'ifUndl th4 buttij'oint'fto,'.scAliit}/fAIsin tin'ck wide. belt' was wrappedfasounit"the :. f5iir o'inkshealfdi.rppandlismat'eirialhNitsfused'toloid theiblankef'in;placeJ - ~ 4.A;2471nchWondt?sixWeh'.'widejsifigof KGwo01Nrai.placed on the.catt6n:at'th' )c 5l@s gsho;s'in.frisurei Exe' estent,6(the!.wr, app 4d top of3hetray!TKphcWgEmph- '~ as t S . :... ' 9;useasta.thinV.stettest A J..

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's JVf.. t...inchief Easweel blaabet:was.tpleaeden bothithaufront'.~sf-the troy. sad on the hack-geP' l' tray.%Th4.blanhetOwere', held'siiiwithffiber ' reinforces: es,#Q. M'g;g%.,.laddeirrung'.sian of..ths$47'. Tf.e7 tray;V' spp

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.tspe s's'shewa:iRFigure wasirillW{withjeefte' a',and wrappd with.:y.;.gr. s b' TystiA. Ia;this test'ratzmastic;285 was~used.as AWN . Esoweelta'.the' manner @.N.e @..,i,%,Pealant7estthe*. fleer,.juse' ysid 7.,??Be < 5The'aditic;was. M-t. laats17.;,1/4 : four,khiskres".Tashae harlsestally on the floer; y. Ja a . ;;;,%gfl-l. /'d',The,s ealant wasi applied ach .'ileer'aad.Esewool and y. s

approximitely'

3/4. inch:

kis%theiteral t ~' ef:the;2atuanstie.'2ss ' .yf ../f' 3 sealant /after application'isisbowa':ia' Figure ~. Q%s sestaatswas card for 5.P,- Me ...:. 651.]?.pth,before3testirig'..Ta order.'te7inersase"tho';cu .:/ -

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k*asterial lastead'ef Intumastic 285.;.The Flamenastic was trewelled six inchee up

? -, w ..lthe, side,ref.the Eseweet. wrap and approximately four.iaches.eate the floor. he . t.:ji,' .J.;Finneaaatis.was slightly more fluid thaa es Intumastisf and it tended te zum dava e d, d A photograpli;pf.the F1smonas'tia;77.after app!ication'is~sheva'ia Figure.6.., $'.J.,ths.isid .~T The.. .:. 8.

I,'tasal~ was

• 'ealy 1/4 inch thickTea'tkitside of the' Esowoolfand 'aa%ne.h as one Aach 4', 'en!tinf1'eer.;gThe seallws.sicured for five.daysle

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~s thaleuring, rstdi.:the seal was1heet'ed.h!%' a space hester. J r- $g:m$qp%.K!:tvMMy S'4./,1.A.s/cJthe:searce at. fir p)T Wp's.q.1;.. - ...y'.

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$E wd!a,axtithese:. tests . poured. inta the pen centaining the wrapped cable trar;.. After 'approximately. one "..W. /jmista p.91.talg. 6pisungFthe-hoptane - i ignited sad suewd to burs'untu it was eser !.2/3 w:s :Lassutts.inf viscussson]..g@;%:ei.va %:v4ft j seneused.WW ' ce 4, - :.. %. ~ c. e '.. u:; ^ .. g' y ghjw:#nghw G:!.'. 'D. ^ $e:,a - -0..u.m:% c... > - ' Q.Q asem-w. 4. a w:W,aes,hotograph eUyEe~wdr fecau.ble tray without a: -u p edesa "1 i is nowns neur <.r 3.f. u. u ar.parwa a: .f ate seet wd sir.r tuta+.Kra:c .M./TI.Thar. fire lJasted adoriu r pproximatelf.37'ainutes.GPor.the.!a.st 15 minutes.the fire vasir.W Esewool wrsy at"tho' floorWD14. l b :*@very!11ghtfe'ad burned;alonOthe$ettes'adge of t she: . ibuksing;is#sheva#}Figp{ia%After: a11' the keytane>tti:haythe'.Esavoel; t 8 ss Y " '("g> ver' sad lthe cetton rnected4TWe4tted. nee e; fleer"af' rea 4 ares:stuhburwag.y.rhetogrsphs;ofi'she ti,a.thV. tray}sse - rune f., ina widenee%burni;tr y; iny.the ift?f(U fe 'iDi'gdrew.naret 'aise ~ ngrof!the (a hty. th adddP.ruiig sidi"dfMaitrad '. fir,ef{2ifioti abiss~,ths~ flhiO Y M1%p!caaEladadai't[sethitheTe1 at:enyIA3dQtir'syijwithfiialy7haeh * "]fof."u'r l @Qfefei tt j e Tha 'sewoolrb1 sim16 46' lacedjon4cthTsho Jap:!IiE ae.~iid) and'.botton' of % tray: E M fete'lw ^ ~ .Thiyt, y,%%]in': Tests 9 4...:$.. ' '.C'. T**k'l: #i'?l$::Qi?" a sasV.i d .N 'fi[,'..!. O, I ,. ' [ ' j.f. ff$> .:..,,,;.. w.,..

I .G.'- t*:Q ,.'.h.~' )Y: :, 'jS.3. e,. . :. t.. (3 y b S' Ih'hr$>I; w.inphessA; omer,;. .. 4 . 349: w ria 2.:'.t.:..were 'placed.on'Jheyc%p(falaute.%7h,e 1 'M{durin's.th( test; butitheretle' fire sess:spyroitistely,ef thq. h rom warplag'.%1he'. duration of 4 e ntismistle'.285"b11stered severely. '3 I 0:;$'shown in J!'gurC1goere'y;wasM7precOEgfe, 'ths'istal).'@'63*11' ters, wh s fg robab17 . acesplets. curing ef<the Intunestic ,.r; b*;and'Wolling'eQhe;watelihrithii(ti;cas'ed Th'irsisceiip1' i'*me'er'the fleer e' 1 s'eset 3 %2(adicited'a tesp4rsturefris6'lefit'f,.'dirisg3 ' inseeded Tite"resalts..re3he n'. " tesW' Aft"er'<the. test the Kaoweet i .'-f .rvanaWitarem=6adsend-thet ette' x=as " inM efting'ef.the cettes - a . c4 ,.J.Oy.I) fro.12RjiThere"

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y <d><, ,'i..i as heWW;,..eb .@V."%}M.&.A; .n v.. -t... s s veryjsili1Ist'te Tes't E.. h, f.yy . dt ri '."a^rj C,. .'r smeanst a, 9 1he,faieflasted. ijrpre'aimately?1Feis0fes#tThe ..';', f" 5.,p)7*: blister lor'eraakQThe".conditiml.Wedeus'etof'inc'iPlan 3 ' 3? .v. staan dur'ing'the testi.probably aglete.eurin's but it did met / G e3f:the'.ssil'istter2the;' fire is shown in Plsvn d N.* % 'gt.,13M*.Thelthermo'oop!es'amar:the' floor.indiist' dineh c e test. f' Atter removisg ths.Kaowoolivirap".and'ie41Tithencetton'isas. laspected.'.:The...sf g d p .l. 'Aa 'I. s d,uriaQhpfire t9st."64f:9 q(.'#7'W/.V+1: u.. y '.2

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. 'I*. Kaownel' blanEct:ss's fire _ protectes' wrap around open IndJer er open top

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• cable : trays yhicFpenetrate through. floor seals.may.' permit soaking of

1di .M/ *pt.t.flammab.1sf ligulds*Inte;the sable trays in thei. event of a flammahlo 11 gut.1. p';,f,W P. vsp!!!Y If tho'.11Iuld:should 1gnites. burning any.mecur inside the tray d d:'.v. '. ;aetr' the.. fleer, :. i .?' '- .W .V*..- i

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n'y 9: y ,.e, /2. Prhe yse of commercially.arsilable fire totardant coatings.such as !atumsstic Jt'*.",/ .-w.eg,r. 285 had.Flamensstic 77 as :a seal at the fleer would prevent 'the soaking

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.y <:4 .f, *'of.Yilemmable" liquidsinte(the troy! wrapped with Knowool. This will. prevent 't 2 ,M 4.

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. j.G.1 thai burning l.inside:Kaowoo1 Mapped'open ladder.o uhich, posotrate'through fleer seals' fin;the event.of a flaanable.liquide Wyg{'J,gf. '. ',j. .f,@f* y TW*,j'

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~ .'.%sm %g@ry,itica 8 $8P.igan gu ..d v s..

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g. Fort a11.topen.1

< cab'le trays $1th o;/ - nly.ene-inch'ef Kaowoolf. wrapt it'.li[~St', - + Q'ueciss es31acac/mief. inch,Je. blanket 'along lthe ! ' 31 adder.. side.of.the' 'u .buttdelats'.',rW.tM in 6.' provost fire froa. .ithrou d?ih@,N$&,#p 1.4 I:*.* r :.* g ' *:: v1: "...t,,,.y _. a.... '.gg (g.,a ? e , n, w r p,. .g,7.g W M, l 1CN i:' raystwhicM. ?f;..'-.CW. ?Si&, '?%.* l. l je.w 4 r x. . $%ie'h%etrate3freighTfic fa)are.td!be. protected 2rithiaitnowool;0 y ~ yrecemme s'Ti retro t s'rds@ soit'infg*'ast'eri s1

• as !stumasti'e.285'.pryF1sambasticl.27fbe;~tr@ewe h'I'. $ Ml: d.:.

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~ ~ JOSEPH M.FARLEYNUCLEAR PLANT NUCLEAR GENERATION DEPARTMENT MEMORANDUM

SUBJECT:

NRCInformation Notice (IN) 93-41:DATE: JAN 111994 E One Hour Fire Endurance Test Results forThermal Ceramics Knowool,3M Company FS-195 and 3M Company Interam E-50 Fire Barrier Systems FNP-93-0461 TO: File FROM: Alan Phillips NRC Information Notice (IN) 93-41 was issued to alert licensee fire endurance tests for Thermal Ceramics Knowool,3M Company FS-195 an Company Interam E-50 1 hour fire barrier systems reviewed by NRC inspec during a reveri6cationinspection. This IN refers to a NRC reverification inspection of the subject fire barrier at the Salem Nuclear Generating Station. FNP Resnonse ' Per the attached NEL letter, dated October 21,1993, Bechtel has reviewed these results and concludes that the existing fire endurance tests adequately demonstra that Knowool can be expected to perform as required in a postulated fire. No further action is required. The Bechtel costs (REA 93-0271) associated with th IN was approximately $3,500. The NEL staff expended approximately 5 work-hou and the FNP staff expended 1 bour in the preparation of this response. l l l l l l APPDOIX E

l. IN 93 41 1 l l I \\ Prepared By: I i l Technical Manager: pjft". _ m i l / l t I I O i o 4

E scchtsi M C O P f.~ ~ 9801 Washingtonsan Boulevaitt i;.y ~.. Gaithersburg. Maryland 20078 5356 g .. ~ (301) 417 3000 e t Y \\g l In reply refer to AP-20482 L } Dec e spn

• IHS Mr. J. D. Woodard Vice President - Nuclear Southern Nuclear Operating Company I*o <- M6M Nuclear Generation Department Post Office Box 1295 q

do I bd Yd" 4 l Birmingham, Alabama 35201-1295 C l= bo / (

Dear Mr. Woodard:

i Joseph M. Farley Nuclear Plant Operating Services l Bechtel Job 7597-042 Licensing Basis for Kaowool Fire Barrier 1 (ES 92-2388) j Bechtel File A-88 and E-18 ) This letter provides a complete response to your ES 92-2388. } In Amendment 3 of the FPPR (Fire Protection Program Re-evaluation) dated October 1978 a commitment was made to add a double-thick barrie j consisting of two layers of a 30-min rated enclosure around one train of electrical cable where the train-to-train separation was less than 1 20 feet. Prior to Amendment 3, it had been decided (after reviewing several 1 1 types of fire barriers) that two one' inch thick layers of Kaowool would be an acceptable enclosure. Subsequently Drawing A-180561 was j issued to show the raceway locations where Kaowool was required and j installation procedures were issued via A-177541. Note that D-size . drawings have since been issued to incorporate the information provided in A-180561 as well as to provide as-built information for subsequent Appendix R related design. ?. On April 13, 1979, the NRC issued the Fire Protection Safety Evaluation Report for FNP. It stated that the fire protection program as,then designed (as documented in Amendments 2, 3 and 4) was acceptable since it met the conditions of General Design Criterion 3 as well as the guidelines of Appendix A to BTP APCSB 9.5-1. i ~ BechtelPower Corporallon aeresawcena 4 e

Mr. J. D. Woodard AP-20482 Page 2 Effective February 19, 1981, the NRC again a.' ended its regulations to fire protection at nuclear power plants licensed to oper January 1, 1979. room walkdowns and several interim amendment submittals base additional NRC clarification concerning certain provisions of Appendix R, APCO (Southern Nuclear Operating Company) submitted Appendix 9B of the FSAR to the NRC via letters dated March 13, and May 31, 1985 1985 to document the technical exemptions requested from Section III.G., i J. and O of Appendix R. Specifically, several of those requested involved Section III.G.2.c to the extent that one fire barrier having a 1 hour rating. train of redundant safe shutdown c 2-2 for Fire Area 2-043 describes additional protection being affordedAs a in rooms 2462 and 2452 by enclosing one train of redundant raceways in a fire-rated barrier. The corresponding NRC EVALUATION for this area states in part "The S/G-B pressure transmitters and the redundant S/G-C pressure transmitters located in room 2462 are physically separated by a distance greater than 20 ft. and two channels of the redundant S/G-A, S/G-B and S/G-C pressure transmitter cable raceways routed through room 2462 are protected with fire barriers. The ~ raceway fire barriers are composed of two 1-in.-thick Kaowool blanket wraps with one overall layer of Zetex woven fabric." The NRC then goes on to conclude that this exemption be granted. This is one example which is typical of many such Exemption Requests which have been approved by the NR(.. Finally, the NRC issued Generic Letter 86-10 on April 24, 1986 to provide further guidance resulting from Regional Workshops which had been conducted to clarify various Appendix R requirements. Under Section 3.2.1 Acceptance criteria for Fire Barrier Oualification of that letter it states in part that " Conduit and cable tray enclosure materials accepted by the NRC as 1 hour barrier prior to Appendix R (e.g. some Kaowool and 3M materials) and already installed by the llcensee need not be replaced even though they may not have met the 325 F criteria." Note that the initial tests for Kaowool were based on ASTM E-119 time temperature curves. The NRC has indicated that any "new" wrapping material which is required meet the acceptance criteria as defined in Chapter 7 of NFPA 251, i.e., - the unexposed barrier surface should not be more than 250 F above ambient which is generally recognized to be 325 F. A

. ~ _ -. -. -. - - _.. - Mr. J. D. Wordard ~~ AP-20482 Pcga 3 Ther:sfore, the issuance of Amendment 3 of the FPPR along with the subsequent response to Appendix R and the information contained in Generic L'atter 86-10 all form the licensing basis for the use of Kaowool. Consequently the existing installation of Kaowool at FNP is acceptab'e even though future applications are not covered by the referenced documents. If you hnve any questions or comments, please contact Bob Puhl at j (301) 41*i-8632. 1 \\ Sincerely yours, BECHTEL POWER CORPORATION l A UNIT OF BECHTEL CORPORATION WA l Se T J. E. Love Project Engineer JEL/JES/RJP:saf cc: R. D. Hill, FNP D. J. Shelton, SCS J. A. Wehrenber J. H. Shivers, g, SCS SCS J. W. Wilson, SCS D. H. Jones, SNC, w/ Original J. A.-Knochel, WEC _ l e D 4

@ m htcl { h 9001 >lnshingtornan Boulevard Gaithersburg. Maryland 20678 5356 (301) 417 3000 ] OCT 01 1993 In reply refer to AP-20847 IC4 C. h N a w34 j Mr. D. N. Morey Vice President - Nuclear i southern Nuclear Operating Company 1 i \\D D#b i Nuclear Generation Department Post Office Box 1295 [ Birmingham, Alabama 35201-1295 j

Dear Mr. Morey:

a Joseph M. ~Bechtel Job 7597Farley Nuclear Plant Operating Services i Technical Justification Review of IN93-41 Bechtel File A-8S and E-18 (REA 93-0271) This letter provides a complete re'sponse to your REA 93-0271. t The information contained herein is per your request to provide a technical justification of the three fire barrier systems (FS-195, Interan E-50 and Kaovool) addressed in NRC Information Notice 93-4 i i 4 As listed in Attachment 1 of the Notice, 3M Company's FS-195 was only i used at Salem. In addition, 3M Company's Interam E-50 Fire Barrier i System has not been used or specified for use at FNP. However, for reference please note that 3M Company's Interam E-53 and E-54A fire protective systems have been specified for use at FNP as acceptable alternate fire barrier systems as documented in AP-19390 dated j. November 12, 1991 and AP-20534 December 29, 1992. i Kaowool was selected and installed at FNP between 1979 and 1980. { The selection was based on several presentations and verbal 1 discussions with Babcock & Wilcox along with a test report they had j i ssued entitled!" TESTS FOR FIRE PROTECTION FOR COMPLETE ENGUL s CABLE TRAYS AND CONDUITS CONTAINING GROUPED ELECTRICAL CON j ' dated October 24, 1978.' Subsequently, due to a conceIn regarding j other testing which had been done at Sandia Labs as to the ability of Kaowool to provide sixty a.inutes of protection, B&W was contacted and alerted to our concern over this issue. In response, B&W sent us UL test report 78NK5345 dated September 6, 1978) a test report conducted j by Cincinnati Gas & Electric and an affidavit from the NRC stating their acceptance of Kaowool. Therefore, based on these reports and j general industry and NRC acceptance of Kaowool, it was concluded that { Kaowool would provide adequate protection. t i j Bechtel1%wer Corporation uwneacame, a l l y.r-- w-<a w --r-w -.-inw+ y-y, -w- - +y m-e

. we I '* Mr. D. N. Marcy AP-20847 ) Page 2 The format you requested for the details of the technical justification for Kaowool is presented below. " Summary of Test Results" Parameter Knowool Scale of test Small-scale (1) Test laboratory Independent (2) Hose stream test Not performed (3) Cable damage charred Tested Representative of (4) configuration in-plant configurations Maximum Approx. 425 deg.F (5) temperature at i hour comments Accepted by NRC 11/20/1979 i 1. Even though the tests conducted involved only several trays and conduit and therefore are defined as small in scale, the provide enough engineering data (ie. banding techniques, y do overlapping at joints, termination techniques and etc.) to justify either directly or by engineering analysis that the installations at FNP will provide the appropriate protection. 2. Underwriters Laboratories Inc. File R8758 and Project 78NKS345 dated September 6, 1978. 3. The hose stream test was not performed in any of the referenecd , tests. For a cable wrapping system that is designed to provide one hour protection, it is unclear and appears unreasonable that the NRC maintains that this test be a condition of acceptance. e m c-- -,-r ,e

Mr. D. N. Moroy AP-20847 Page 3 4. The configurations tested are representative of actual installations at FNP. Every possible combination of wrapped raceways was not tested or even known when the initial testing was performed. However by these tests to ju,stify acceptance.as in (1), there is sufficient data provided 5. This temperature was obtained from the thermocouple location in Test No. 3 of the referenced U.L. test which would approximate the " cold side" temperature of the barrier. criteria is that the transmission of heat through the specimenThe ASTM E-1 shall not have been such as to raise the average temperature on its unexposed surface more than 250 deg. F above its initial temperature. The ambient (initial) temperature is generally taken as 75 deg., would be 325 deg. F.thus the acceptable cold side temperature per E-119 However, since all the circuits in Test No. temperature of approx. 430 deg. F),3 were still functioning after 61 it is concluded that 425 deg. F is justifiably acceptable even'though it is higher than the(since acceptance criteria of 325 deg. F. ~ If you have any questions or comments, please contact Bob Puhl at (301) 417-8632. Sincerely yours, BECHTEL POWER CORPORATION A UNIT OF BECHTEL CORPORATION J. E. Love Project Engineer ~ JEL/JFP/RJP:saf l cc: R. D. Hill, FNP D. J. Shelton, SCS i J. A. Wehrenberg, SCS J. H. Shivers, SCS J. W. Wilson, SCS i D. H. Jones, SNC, w/ Original i

i .a { Intraconnany Memo Southern Company Services DATE: 10-Aug-1993 04:23pm CDT i RE: KEB LETTER FRON: M. Peggy Allison i Hatch Project i 5376 i T0: STEPHANIE M. ALLISON SNC IN 93-40 Thermal Ceramics FP-60 Thermal Ceramics material Kaowool and FP-60 are used at Plant Hatch as fire retardant or barrier material. The River Intake Structure is the only location where Kaowool is used as a Nominal 1. hour fire rated i barrier for Appendix R criteria. The Kaowool fire barriers provide protection of open cable trays to reduce the combustible loading in i I support of an Appendix R exemption request to preclude the installation of an area wide suppression system.,The fire barrier material was 2 updated with FP-60 to improve the durability of the protective wraps. FP-60 is also used throughout Plant Hatch to achieve electrical separation to ensure " Physical Independence of Electrical Systems". Knowool FP-60 was selected based on test reports from the manufacturer's 4 and approvals by recognized agencies. Specific attention was made to I-the FP-60 configurations and test data prior to use as a fire barrier for Appendix R, in an effort to. determine NRC concurrence. IN 93-41 Thermal Ceramics Knowool Kaowool is installed as an acceptable barrier to achieve electrical j separation to ensure " Physical Independence of Electrical Systems". Kaowool is installed as a lay-in protective material for cable trays and ~ i wrapped around conduit. Kaowool was selected as a result of manufacturer's test reports and the approvals by recognized third party testing labs as well as NRC information. Kaowool was selected using i criteria for circuit integrity prior to the unexposed temperature ~ requirements of Appendix R. i 1 o m .e .y M- -r --w r - - - - - -w f T'? ~ c+-- T'r y}}