ML20004F046

Forwards Draft 2 of Proposed Revision of Reg Guide 1.120, Fire Protection Guidelines for Nuclear Power Plants

ML20004F046
Person / Time
Issue date:	06/20/1977
From:	Arlotto G NRC OFFICE OF STANDARDS DEVELOPMENT
To:	Fraley R NRC
Shared Package
ML20004F045	List: ML20004F044 ML20004F046
References
FRN-45FR76602, RULE-PR-50 NUDOCS 8106160443
Download: ML20004F046 (7)

Text

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ut3TED STATts

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-1 NUCLEAR EEGULATCRY COM!.'.:sSICN hJ g...wi eN j wAsmuc~cs. =. e. 2csss

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EW 201577 Q

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MEMORANDUM FOR:

Raymond F. FraTey, ACRS FROM:

Guy A. Arlotto, Director, ES, SD SUSJECT:

PROPOSED DRAr c, n:. VISION 10F REGULATORY GUIDE 1.120,

" FIRE PROTECTIDN GUIDELINES FOR NUCLEAR POWER FLAllT5" Enclosed for the use of the Regulatcry Activities Subec=nittee 'and the Fire Protection Subcenicittee are ten copies of Draft 2 cf the proposed revision of Regulatory Guide 1.120, " Fire Protection Guidelines for Nuclear Power Plants," dated June 17, 1977.

l t

l This guide was considered by the Regulatory Guide Subccmittee in l

closed session in June 1976.

The subec=i tee withheic cc=en at that time, and the guide was issued for public cc.:nen: in June 1975.

The ACRS Fire Protection Werk. Group. held two open meetings on the l.

guide in July and August-1976.

An acdi:5cnal open mee-ine was neld with the ACRS Fire Prc ection Werk Group on l'.ay 4, 1977, and accitional l

l public cc=ents were sciMtes a:-that time.

._.S.ubJi.eMent....the A.prii distributien of Draf.1, Rev.1 c Regula: cry,

Guide 1.120 the staff has received lg le::ers ccamenting en the Guice.

These cocinent letters, representing 12 different scurces, can be categorized in three greucs; a) precedural centnents directed at the i

guide issuance, b) general eccinents addressine the s aff philosophy on fire barriers, the use of water and the fire hazards analysis and c) recc.Inendations for specific changes to the guide.

I. review of all the comments received te date has resulced in a few minor changes which have been addressed in the Resolution Of Public It shculd be noted that an ever<thelming majority of the Cc=ents.

coments renpved duclicated cc=er.:s creviousI> received anc considered by the staff in the ceveicemen of Rev. *. c# :ne Regula cry COCACT:

E. V. Imbre 44-35420 1

i UUll U.8 50

• ENCLOSURE A 81g O

5 JUN 2 01977 Ray:nond F. Fraley.

Guide.

The fundamental staff philosophy. regarding fire protection a

of nuclear power plants remains unchanged.

TJ-This draft of the guide also reflects a number of changes made by our technical editing staff. These changes, since they do not affect the staff positien, are net discus. ed.

Comparative text is based en Revision 0 issued June 30, 1975.

1 a.evised guide nas been reviewed by all the re. levant offices and divisions within NRC.

~

Also enclosed are-ten ccpies of the public cer.inent letters and a discussion of the resolution of public comments.

ACRS concurrence in the regulatory position is requested.

l lA

, IP.,f'j/ Arlotto, Director,A-llt i;;gn'dP1 Guy.A.

Division of Engineering Standards Office cf S.andarcs 'eveio men-Encicsures :

1.

R.G. 1.120, Rev. 1, Draft 2 June 1/, '1:'/ /

2.

Statement of Resciutien of Public Coments on R.G.1.120 3.

Ltrs of Public Coment on R.G. 1.120 cc w/encis:

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?00RBRBINAL

M;ww Resolt:ics ef' Pub 1fe Cc==en:s Ke:eived c:

Draf: 1, Revision 1 to L G.1.120, "yirs

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?:otec:ie: Guidelines for Nucles: ? =ar Plan:s" (Received ? io

o Ju=e 1, 1977)

As evidenced by the 1e::ers of coment here appea: :o be five general creas tha: received frequen: co=mes: and warras: discussics or clarification.

1.

Scoce of R. G. 1.120 The scope of L G.1.120 encompasses all safety-rela:ed s :ue:ures, sys:e=s and co= pones.s a:d all plan areas tha: ei.her contain or could present a fire exposure hazard :o saf e:y-rela:ed s::uctures, l

systems and components. It is the protec: ion of all the saf a:7-related aspects of the power plas: that provides :he =acessary defe=se-i=-depth capabd:7 := achieve and -=d,

d-saf e (celd) shutdown and :

-d

'-4e releases of radioac ivity to the anvi=c= ment.

2.

Use of Water to Tich: Fires

~

x daer of ce====:ers is tha: :he s:aff has over-

~he e.esiti== caken bv.

e=phasized-the use of wate: 1: general and particularly :he use cf au:c-

=a:ic va:er suppressie: systa=s to co= bat fires.

2.is ec==e:: vas =ade before, on Revision 0 of the guide, and was carefully conside:ed by the s:sff a d its consul:a: a i= the develep=e : of Revisic: 1.

As a result, Revisi== 1 ef the g:ide is sig.ifican:ly diffe e:: tha: -he previcus z

p revisi== in :.11s area... Safjt:5. _re'ned cable ::ays i: =es: cases ca===v be p:c:ec:ed by au:c=atic va:e: suppressic: sys:e=s providing area pro-

)

ec:ie: ra her :has pro:ectica di-ec:ed at each cable ::av as previedsly

)

i reew e:ded ^ Revisic: O.

5 sese situa:i.cus (as-de:ar.ed i: :he guidit) anual pro:ection; i.e., hose a=d s:ane_ pipe sys:e=s v

suffice.

Tur:her-t

==:e, i the 18 plan: areas listed in Sectie: C.6 of :he Res. Gu'de, y [au:c-

=aci: va:er suppression system

.is specifically re=== ended i= culy cue area; na=ely, the cable spreading roc =.

~he staff has carefully weighed thei~advas: ages a d disadva= age. of va er as a fire suppressic ages:

~~

l and has concluded that a prope balance has been achieved and =c further i

l cha:ges are required.

l l

~fd5ee Ecur ?a:ed Fire Sa riers s

2.

i Zany c. _ e=ters are of the ep* 'c: :ht:

he ra:ings of fire barriers seps. ::1:g redu=da:: safety-di.-is'c=s and fire barrie:s separating saf e:y-rela:ed s::ue:ures, sys:e=s and ce=pene::s f:== :::-saf ety-related fire ha::.-ds sheuld be de:er=i=ed by a fire ha:ards analysis ra:her than usi=g P00R BRIBM

-3

.=

?nssate of :he 3S3 tes: is e:1y indies:ive ef fire re:ardan:- 1: :he s:asdardized es: confi:ura:1on.

I: is to: possible :o ex::apolate these :es: resui:s :o other cable leadi=g.configura:10:s.

The s:aff g

rece= ends, as a =i'd~-, the use of cable qualified to 1 t -383 but,

+

1 recogni: ion of :he above, additio=al fire pro:ee: ion is also reco= ended.

he staff position re=ains "--haged.

5.

7 ire F.azards Analvsis A st:c= gly voiced concer hv a number of ::= esters, is :ha: the Reg.

l' Guide is overly specific and that all fire pro:ection should be based solely on the fire hazards analysis.- In addition, many feel tha: the fire hasards analysis has no other pu. pose but :o verify the specific reco=e=da-dons give: 1 the guide.

The bala:ce betwee: gen a1 guide-li=es and sperd c' guideli=es is a Ad 'ficul: o=a := achieve is any

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sta=dards docume==.

Should the scale svi=g too =ch :o either side, :he -

l resul: vould be ei:her a docuses: :ha: is so general :ht: 1: beco=es useless or so specific tha: 1: restricts :he crea:ivi:7 ci che pla=:

desig=er.

The staff has give: specific guida=ce is areas where ve fel-specific guida:ce was needed; hovaver, i: any cf the eigh:ee: areas detailed i: See: ice c.6 of :he guide the cheice of the suppression ages is lef: :o the designer and vd be de:e:;:i=ed by a hazards analysis.

5.

-d-.

ef de:ee:cr tree and smacifd-is-s-d-- n veil as -he :::1:gs

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of fire ba--iers tha: =ay be necessary vi:hi:'a -ive-safe:7 di'tisi:-

_11 a.:. c e c er e:---

ec ey :ne f:.re f.a:ar:s analvsit The f.:e ha:ards

-21ys.s v '* he the pr.=cipal desig: cc:=es: de:e: d-d:g :he. fire d

m pro:ec-da-a 'arge por_ ion of the pla::.

Tne s:af f believes tha: a, d-reasenable-talance be:veen specifici:/ and generali:7 has bee: achieved i: :he guide.

Tais belief is supported by :he fae: :ha: ::=en:s on bo:h sides of this argu=e : have bee: received.

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O 200RORSNAL A

g

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=..

. O fir.e4 three hour fire rating as ee_ue-ded 12 9e *=r tate y Guide.

3:.s ce=es: s sc new asc has been c==sidered i

e ceve ep e:. c;.

Revisi=s 1.

S e s:aff pos*: ion r=-='-* unchanged a:d 's based on the fcllowi=g:

1.

A precise qua=ritative rela:ionship be: vee: :he ec= bus:ibles i= a given fire area and the rati=g of a fire b~a=1er sufficies: :o silow :he consump: ion of all ccmbus.ibles in :he area without breaching the ba= der does so: exist.

2.

ne. hree. hour ba=1er raMng gives he plan: fire brigade an ex re

.=argin. ci-ime in tinich to combat a fire.

This is particularly i=portan: considering :he remo:e location of nuclear pla :s and the -

potential :ime delay is the anival of addi:ic=al fire fightics capab'":7 is the unlikely eve:: :ha such backup to the pla:: fire b-igade is needed.

3.

i :hree hour rated fire ba=ier is :he

'-1== rated fire banier

-hat is cons cue:ed as irely of se:-ce=bustible =atertal.

4

"'. ee hour ra ed baniers, is i:dus::ial usage, are =c: u: -

c: i the protec:ics of "high value risks."

1: seme cc e:cial applications four hou: ra:ed fire ba=iers are :::strue:ed := define the "=azi==

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foreseeable loss."

5.

ta :::: carri.ers prov ca se e :::serva::.s: :: ::=pe:sa:e,:: :e

s :a'::ies ist:cduced by unferesee: ::assie:: =c= bus:ibles ever

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-..:he_f es:y -year. cpe:a ing 3 * 'e ef :he pla::. -

l 4

Reliance ce Cable Oua" ad -

---

383 Cable qualified c the fire tes: 1: !-- -352 is s:ill :heugh: ef by a.7 c =e::ers as bei:g sufficie::ly fi e..re:ardan: :: require li:: e if any i

fire p;c ectics.

'"he staff regards :he

.:.-aE3 fire tes: as s::1::ly a l

scree isg :est, i.e., the tes: V' e

' ate :be notably poc: perfe

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I cable insularie=, bu: passing :he es: is ::: in itself a ne..c. essa-and

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,,c..<.

.a,..,,,,s

.a e.s-.a.s-s s a -,

< -a-.

s.. z z.. a-----e-------.

ar e cab'.e ay fi~.*. and' :a: _e ifaEEg. *..,,...,

t.:.ch are s:asdardi:ed i: :he :es:

?00R ORSINJ1 w+w--=ww-ww---r-weg.,ww w-- e

-wwwworw--e-wwwww=v.w-ww w-e, ve,

,,,w--,r

--.v--mwww-w,g w yw y

,p-e,--ww,,i-,,,.r.w.,,w ev-,,.,m.<gi ap,-ywcy.e---wcr.y--e.y,%me-=.

gi -%-w yo-= y-eisy-ye e v -* e

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rf r

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C'..a.s s =..esu ' ' +.: =.. _ =..*

r.- _..

Pace 5 - I.2 1.

Added " Cable" :o heading of See:io: 2 (IIII) 2.

Added " vical" in place of " pars =ou :" (GI)

Psce 22 - C.4.a(1)(a) 1 1.

Added "is,no:-safety-rela:ed areas" (GI, ?SI&O, IIII, S&I)

Clarification sada to avoid the interpretatics by sc=e hat equip:en:

l

=eeded to be separated from itself by 3-hr rated fire barriers.

?are 25-C.4.a( 9) 1.

Guidance added regud1=g sizi=g of gas suppression syste=s :o ce=penst:e for leakage t,arough floor drains as a= al:ersative :c p;cvidi s drai:

seals. (I- - -1)

? ace 26 - C.4.b(3) t, 1.

Chz=ged "highes " :o "high" a:d "leves:" :o " low". (IIII).

,ece --

a l

r l

1.

C.4.c(1)

The guida::e regarding electrical e :dui: has bee: revised, es<s....

..a..es.

.e

.e......s e..

.:.u

.....a,.u

, s.--..-

.s.

s...

in :he guide was.diree ed -

-%s use.,of c 17 rigid s:es' :ubing as include the elec::ical condui.

Ihis guidance has been b cadened

. ~ '. ' - ~,.

c..*...'. *. s - e ', e..,e. s---...e condu,- :c.

.....-... <,g ex e.

.s

..ge e: e,:.

e z,,a

. prov:.ce, ::r :..e use n

vu: Ance nas a so cae:

cc :ec: :o ecuipme::.

(3ech:el, GI, Yankee A:: i.

IIII).

I e:allic ec duit, al hough no: censidered a

ra:ed fire bar-ter, does t

I w

i provide a degree of pro:ectics f e:- ele ::ical cables f::= he effe::s of I

exposure fires and elec::icallv 1 izia:ed cable fires.

Irperience has a :<

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.a,,,;

e.a,

. -..-.c..<>es

.,<3--..

ess c.

s..c

.u....a.

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sidering the. exposure fire, l

ee: ice for the cables, particularly whe:

l tha c her :ypes cf ce:allic conduir.

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.,.w.

. "in ne:-safe:7-re a:ed areas".'. _

ire.,. -

C.L.

(2)

' ' e 1 ac..ce:

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e...,.._ ( n.

..,. e. er' s. e.

e " a.'. -

.* -. s -

a.*.

> =. *..-..-..' '

t. =. a s revised.

Area s::ke

h = ugh.f..ich saf e:7-rela:ed cables pass has bee:

de:e :::s are : v rec== ended as back-up

:he ::::inu:us-line-de:e::::s culy vbe: =anual suppressic: is relied upo: : p c ee: :aile ::ay ce:-

figura:ic s of six c less as de ailed in he guide. (Iankee A: _ic)

P30RORGWs.

-,,n

,,-an

.,.r.,.

,,n y

,--..--w

,4-,,

a

,n n,

,.---,,,,.,,,.mn.

v,.y r g-~~,--w-~w m

..s:

Af:e addi:ic a1 discussic 1: vas decided tha: he recc=enda:ic ic: area s:cke de:ec:c s is all areas ec :si ' g sade:y-rela:ed cables was excessive when au:c a ic va:e: sup;;essi:: syste=s and li e-:ype-de:ac:c s are p;cvided and red =das: cable divisicas are

~

separated by bar-ters having three hour rari=gs.

~he ree._ e:da:1c ic: con:i=ucus line-type-detec:c s has been re:ai=ed since :hese de:ee:crs t.-ill p;cvide the cuickes: 1: dica:ic ed a fire.

Pace 29 C.L.e(3) 1.

~he las: se=:e.sce was changed to cc :ee.1 a= 1 :e:p:e:atic=, =ade by some, tha: fire testing was required af:e: :he pene::atien seals were installed i= che plan:.

(Tankee A:c=ic, I m )

Paee 34 C.5.b(3) (b) 1.

Added " Class II" (Tankee Acc=ic, Sargen: & lu=dy, I-~~)

A=y electrical equiptent cha: is "per:a:en:1y" cc :ee:ed to the Class II electrical syste: =ust be Seis=ic Ca: ego y a:d Class II.

Pa e 47 C.6.f 1.

Add.i:ic al clarifica:ics has bee: t. revided retardict. the sec.aratic:

cf "le=c:e Safety-Related ?a:els".

Separa:ic-

~#

- d ->an: saie:y-

ela:ei paisis b-T hc2: if er Ta' iers is' rec:==e:ded. (CI)

.~his_;..idance..is. c: sis:en: v_:h -ha given 1. 5ec:ic: C. I.a (1) (b ) -

and does so: represes: a change in staff pesi:ics.

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