ML20029A540

Forwards Fire Barrier Characterization Survey for Utils. Estimates Based on Judgements of Plant Personnel Acceptable. Responses Due by 910325

ML20029A540
Person / Time
Issue date:	02/05/1991
From:	Farmer W NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
To:	Carey J ELECTRIC POWER RESEARCH INSTITUTE
References
NUDOCS 9102250193
Download: ML20029A540 (5)

Text

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[F: e *, 1991 Dr. John Carey Nuclear Power Division Electric Power Research Institute 3412 Hillview Avenue P.O. Box 10412 Palo Alto, CA 94303

Dear Dr. Carcy:

As discussed with you this week, I have enclosed a copy of the Fire Barrier Characterization Survey which we would like to have EPRI send to the nuclear utilities.

In respording to the survey, estimates based on the judgement of the plar.t personnel will be acceptable. 'If possible we would like to receive the responses by March 25.

We agree with the responses being sent directly to William Lowry or through EPRI to William Lowry.

EPRI will receive a copy of the final computations by SEA using the survey to identify the predominant fire barriers and materials in use at the nuclear plants.

Thank you for your assistance.

Sincerely,

//

(c/}{a n,(/ hav n William S. Farmer Electrical & Mechanical Engineering Branch Division of Engineering, RES US Nuclear Regulatory Commission

Enclosures:

As stated c.c:w/ encl.

A. Marion NUMARC PDR h

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l*1RB IWUtilR IUPUI ATIW GMOSITlW Oaestionaire in Suppart of the (CfK !Jaclea; Phtnt Aginj Research Prcoram (!Ti'AR) i Science and Engineering In:ciates, Inc. is assist.ing Tudia

!;ational laboratcry in the deman cd a ! ire barrier test }uogtam f at the US!EC Of fice of Isencarch (RM). This pr ogrma in t o evaluate t!c irpact of aging on the effectiveness of fire torriers instalhd in nuclear generatirg cLations. W will adtess cable and pip? barrier panetration seals, fire retardent cable ccat.ings, cable t ray lit e barriers, fire danpars, and fire daars, The initial task in the study in to identif y tha pruixttinant fir e barrier noterials and syste:ta installed in U.S. nuclear generatira stations. Pcadily available Jiterature descrites the following synt e:m and mterials as those tested and installed in nuclear plants:

Elastcmaric siliCQaci A twa part rcm tenparature vulcanizira silicone conpound used to seal rarall openings and piles of sand in cable trays. One typ) cited was a Gereral Electric trlV Silicone R'IVJ428.

Ecaccd-in-Place Siliconel is two part silicone ccx:paund which forms a low density foam cfter minng, typically injected into penetrations and containcd 1,y infla nable cirtrning naterial. T!uee systems cited in the literat.ure are the Chemtrol CT-18, S1200 PR-855 RTV dilicone Foam, and the DISCO SF-20 Silicone Rutter Seal mterial.

All of these use the Dow Corning 3-6548 silicono ICIV foam conponents.

Mineral Ncol.: This non-combustibic fibrous naterial is pack (d into volds in the barriers, conmonly used as a danming material for liquid seal noterials. Two brands citen were U.S. Gypsum Catonny's Thernofiber CT Felt and the 01emt rol CT-23F alum.ina-silics fiter. In their rigid pressed form (also used as a (trming r.aterial), the mineral wool products are Chemtrol CI'-3450 and Marinite.

Ceent Katerials: Two U.S. Gypsum prcdacts were cit ( d, bath of them gypsum haced, cast in place, eganding ccent: Pyrofill and Fireccde CT Gypsum. Granular gypsum and Portland cenent were also referenced as retho:is of filling panetrations. Gypsum comE (plaster) was cited ad a cable tray shield, where it is p wred over the cables to provide < conhtn ion-free zone.

Fechanical Pfnatr_adon SeQt;. Two "echanical sealing systm we:e identified. One, marketed by thlson Elect:ic (calkd a Mult i Cab.le Tranc' "i e-Seal) consists of a netal housing cast in t.be wall.

In.

.., housing ilt numneus syntnetic split block: Wic!

are conpressed tightly ar d t.he cables u form a seal. Im her fire scal system, sold by -

0. Z. PI e C g eny, relies on opp? sing Oteel platOJ c0;**.in]

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%e two nost connonly identified cable coating l

noter.ials are Planmontic-71A and Flancastic-71. There ate ot.hers, although it is our understanding t.nat they are rately uned.

t Ma are interested in knowing the iollowing l

1) Are the aLove n;ecific systens a gucd representation of the population of fire txuriers in nuclear plants?

Da they form at least 80% of the installed cystens?) Ate the:e other systens and noterials in connon use?

2)

In a' given generating station, roughly how nuny of each type I

of_ device or system are installed?

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3) Are the installation configurations specified tr/ the

'mnufacturer or another source? This is of interest to us since nost of the systens can be applied in a variety of configurations. We are concerned with rore or less " generic" installed goonotries for the _putpose of our testing progra.a. -

4) We are 'alsiinterested in the nunber of fire dxtrers (both autonatically and mnually activated) a-d fire doors present in the plant.

W e attached table provides a checklist which will catisfy our l

. basic needs for data. We appreciate your assistance in this effort.-

L Picase return this cpestionaire by to i

William Lowt,f Test Design and Instrunnntation Divisior Science and Engineering Associates 612 Old Santa Fe Trail Santa Fe, New Mexico 87501 (505) 983-6098-f g

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Cable Tray Penet. ration Shields and Cable System or Miterial E2AlG BEticr.G C0ittiD3 A.. Elastomeric Filler (non expanding) :

t G.E. ICIV Silicone RTV6428 (other)

(other) -

D Foamed-in-place Elastanur:

Chemtrol CT-18 (silicone)-

SE2G PR-855 (silicone)

~ BISCO SF-20 (silicone)

- (other) __._,

(other)

C Mineral Wool:

U.S.G. Thenafibar CT Felt.

Chemtrol CT-23F (cther)'

(other)

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l'GlinnLollArt.Mt.RL_lIWlallDLiQtd Penetration Cable Tray Cable

.SY0tL'm_RI.31t erial Et3h Il2EitLG Codt3R3 D. Cenent !bterials:

U.S.G. Pyrofill U.S.G. F1toccd> Cr Gypsum (other)

(other) t E.143chanical Penetration Seals:

Nelson Electric Multi Cable Transit

0. A. Gedney Fim Seal (other)

(other)-

F. Cable Coatings:

' Flanemstic-71A Plamenestic-77 (other)

(other)

. G. Are the above systems predaninantly installed to mnufacturers'

- specifications or according to sono other guictmce? (check one)

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Kmufacturer specifications Other (sp?cify)

H. Ilow mny fire doors are in the the emplete faci 2ity?

. I. How many fire danpers exist in the caplete f acility?

Autcaratically activated thnually activated Attach any conmn q you nuy have tc thi: p.e i ic:

Thank you.

_.