ML20098D163

Submits Addl Info to Support NRC Review of 920506 Application for Amend to License NPF-29,changing TS Re Containment Penetration Conductor Overcurrent Protective Devices

ML20098D163
Person / Time
Site:	Grand Gulf
Issue date:	05/15/1992
From:	Cottle W ENTERGY OPERATIONS, INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GNRO-92-00060, GNRO-92-60, NUDOCS 9205280055
Download: ML20098D163 (6)

Text

{{#Wiki_filter:- "M Entergy Operations,inc. c 'ENTERGY a .~ W. T. Cottle ] May 15, 1992 U.S. Nuclear Regulatory Comm!+; ion Ma1i Station P1-137 ] Washington, D.C. 20555 Attention: Document Cont.rol Desk ^

Subject:

Urand Gulf Nuclear Station Unit 1 g Docket Na. 50-416 gvf. I,1 cense No. N PI - 29 Additional information Concerning Primary Containment Penetrailon Conductor Overturrent Protective Devices Technical Specification Chang < Under Erigent Circumstances Proposed Amendment to the Operat inn License (PCOL-92/04)

Reference:

GNRO-92/00053, ! c U.c r Ent ergy Operat ions, Inc. tm Nuclear Regulatory Commission, Primary Containment Penetration Conductor Overcurrent Protective Devices Technical Specification Chr.nne Under Exigent Circumstances, P ropm ed Amendment to tln Operating License (PCOL-92/04), dated May 6, 1992. GNRO-92/00060 Gentlemen: Entergy Operations, Inc. by this letter is snhmit.t ing add it iona l Information to support your rnview of the proposed am ulment to the Grand Gul f Nuclear Station Operatir g Licenw tr ansmitt od.ia t.hn above rnierence. This lettnr and its a tt achmon t s provide information to support Entergy Op e ra t. i on s ' conclusion that thn proposed breaker trip setpoints provide adequate assurance timt t.he misociated primary cantainment electrical penetration assemblies will perform their des ign function in the event of an accident. n. ,o- ) \\1 Ax k 's l G9205151/SNLICFLR - 1 9205280055 920515

\\

PDR ADOCK 05000416 P PDR

.m__ May-15, 1992 GNRO-92/00060 Page 2 of 3 The information supplied provides additional detail consistent with our ~ orig 1nal submittal, and does not affect the justification nor the No Significant Hazards Consideration presented in_ the reference for the proposed Technical Specification changes. Yours truly, uPW WTC/BSF/ams l attachments: 1. Response to NRC Ouestions l-2. Coordination Curve for PCOL 92/4 cc: Mr. D. C. Ilintz (w/a) Mr. J. I,. Mathis (w/a) Mr. R. B. - McGehen (w/a) Mr. N..S. Rnynolds (w/a) Mr. II. L. Thoman (w/o) Mr. Stewart D. Ebneter (w/a) Regional Administrator U.S. Nuclear Regulatory Commission Region II -101 Marietta St., N.W., Suite 2900 -Atlanta, Georgio 30323 l-Mr. P. W. O'Connor, ProjectfManager (w/2) Of fice of Nuclear Reactor Regulation U.S. -Nuclear Regulatory Commission L-Mail Stop 13113 Washington, D.C. 20555 Dr. Alton B.-Cobb (w/a) Stato IIcalth Of f icer State Board of liealth P.O. Box 1700 Jackson, Mississippi 39205 l. L i G9205151/SNLICFLR - 2 1 I .~

Attachment lito GNRO-92/00060-Page 1 of 3 _Al GenUral-Information The Grand Gulf Nuclear Station (GGNS) Ugxiated Final Safety Analysis Report (UFSAR) section 8.3.1.2.3.1 discusses the design of the primary containment electrical penetration assembl.les and their associated overcurrent protection. As discussed in the UFSAR, every circuit passing through primary containment penetrations is analyzed to ascertain that two separate and independent levels of overcurrent protection (primary and backup) are provided, where needad, for protection of the penetrations in accordance with Regula ory Guide .l.63, Revision L October 1972 (Reg Guide 3.63). The breakers affected by the pro;.osed changes to the breaker trip setpoints are the primary level of overturrent protection for the associated primary containment electrical penetration assemblics. Nnither the proposed changes to the Technical Specification breaker -trip setpoints nor the associated design change affects the backup level (fuse) of overcur rent protection for these primary containment electrical penetration assemblies. The primary containment electrical penet ration assemblies af fect ed by the proposed change are classifled in the UFSAR as " Low Voltage Power - 3 Phase 480V." The fault currer.t versus time protection for this classificat. ion of circuits is deocribed in UFSAR section 8.3.1.2.3.1.b.3. As discussed in the referenced letter prop < sing the changes in the Technical Spo.-Jication breaker trip setpoints, the breaker trip setpoints are requested to be increased to 32 Amperes (A). The allowable setpoints'are proposed to be increased to allow the replacement of the overcurrent protectivo devices to account for the larger valve actuator motors. This will ensure that the equipment will operate without-inadvertent actuation of the protective devices. Spurt us - t rip avoidance for these devices is based on the valve -actuator motors'. inrush current. The proposed trip _ setpo%Ls are high enough to prevent spurious tripping of the breakers while providing protection of the penetrations in accordaace with the guidance of Reg. Guide 1.63. Proper coordination is Mintained between the primary and backup penetretion overcurrent protection and the penetration conductors. B. NRC Question On May 13, 1992 the NRC Project Manager for the GGNS site, Mr. P. W. O'Connor, in a telephone conversation identified that the NRC required .;dditional information to support their review of the proposed Technical Specification change. During this conversation he identified that the following additional information was nended: 1. A time-current coord inntion curve showing both the primary con ta inmen t electrical penetration assemblies and the proposed breaker setting', ani G9?"5151/SNLICFLR.- 1

_ __m._ Attachment.1 to GNRO-92/00060 Page 2 of:3 2. A definitive statement that the prolosed breaker trip setpoints -provided an adequat.a margin between the operation of the breakers and'the rating of the-primary cont a inment electrical penetration assemblies. C. GGNS Response

1. - Attachment 2 to this letter provides time-current coord'ination curves of the proposed breaker trip setpoints in comparison to the associated backup overcurrent protection and the primary containment electrical penetration assemblies being protected.

The Information on Attachment 2 was developed for your use from design informstf on and is typical for the af fected containment penetrations. 2. The primary containn.eut electrical penetration assemblics affected by the proposed Technical Specification change are constructed wit.h a #6 AWG feedthru conductor. -Attachment 2 shows the ratirgs of the feed thru conloctors for postulated short circuit fault -currents. As shown by Attachment 2, the proposed trip setpoints for.these breakers of 32A, ' s within the ratings of the foodthcn condue. tors for postulat.ed short circuit fault currents, thereby, 1 assuring adequate potection of the a f fected electrical penetration assemblies. 'Anotlier part of the primary containment electrical penetration assemblies are their associated pigta ll conductors. The pigtall conductors link the feed thru conductors to the rest of the circuit. The propose:1 changes in the design of these circuits also protects these conductors. The primary containment electrical penetration assemblics affected by the proposed -Technical ~ Specification change aro constructed with a #10 AWG pigtall conductor. The full load current (FLA) rating for the new val'.'e actuator motor Js 2.3A at 460 volts (V). The approximate locked rotor current is 6 X fha or.13.8A. Per the GGNS Specification for Centainment Penetrations, the #10 AWG pigtail is rated to carry 17A cantinuously (as shown on Attachment 2 the fault enrrent rating -is much higher) under both normal and . accident conditions. Therefore, t.his conductor is rated'to conduct the locked rotor current of the subject motors for an indefinite period of time. This bounds any postulated overload l condition. Attachmmt 2 shows the rat irigs of the pigtail. i. conductors for postulated short circuit fault currents. As shown by Attachment 2, the proposed trip t.etpoints for these breakers of _32A,_ is within the rat.ings of the pigtail conductors for -postulated short circuit fault currents, thereby, assuring _ adequate protection of the af fected electrical penetration assemblies. As shown by Attachment 2, should a fault occur on the feeder cable on the containment side of the penetration, the primary and I --secondary panntration protection devices will limit this fault current t o acceptab:0 levels thus protecting both the penetration p - G9205151/SNh1CFhR. 2 i i ,-e ,w. -. ,..v---- - - + .wn+ e, - - ~

• to GNRO-92/00060 Pagn 3 of 3 pigt ail and fondthru conductors as indicated on the attached diagram. The proposed trip sntpoints for these breakers of 32A, is within the ratings of thn primary containment, electrical penetration assemblles for postulated short circuit fault currents, thereby, nsnur ing adequate prot ect ion of the a f fected assembljes.

F. Roterence GNRO-92/00053, letter Entergy Operations, Inc. to Nuclear Regulatory Commission, Primary Containment Penetration Conductor overcurrent. o Protective Devices Technical Specification Change Under Exigent Circumstances, Proposed Amendment to the Operating License (PC0h-92/04), dated May 6, 1992. L G9205151/SNhlCFhR - 3

~ yllepmaua g 10 DE0-6 2 / 00090 dhc 1 oJ I ) gg g,. 3 p, y,g g g y 6 s $ d O. A 0 8 -' i w> .i e e,,

s. u

~_ _n_ s .um %.r. , a. - i .i . l _, i , ; a ;! p< ji ,i i ..a l ' i 4 +{-

i..! p{-, i ; q! t.

t i + .c M.;.; ~ t; % -.f j j - l i i ^ i rt 3 i; m

. -

j..(( p. 7{ ; )33N31HY1 ION duIWYHA ddolaolIOH 03AI33(

I. . o a GH7vx3H wvoN31ra luId s21 VI cav p F E -t] 1~ j ;1[ l

}

g.;p. 4., 4 uo lLi , p - l,,. i 4. -l -H ..+. ..m. 14...L..O; m m. .m. ! '[ d. i - i i i ,.d d y .L,. M. i,L. h . %. j. ( {j L ! -{ i F-t[; y r .q. -q l... @ p.. l (, L E i l tr *-.' t . 'i

n' :. i 1

. ; l L _p-yp r '-..p;, WO j. j. 1 !. .F t . [ r. - t,-y p : q- -m.. c 4 9.

+-.. -

. - +. - ,...;_L... i. A, i.,,i-4 i i m.- i 4-. 1 3 t; i : ,l i {1t-I.;.' 4 n. e L 2 l E }o s, : ' :.;._..! .. j --. ,,i i,'i '1 .,.1._,".."..: t e L. '. IL. i l;1 4.,, p 1 e i t I ..,,.,i o.. ..l.i ..,,..o l. ..4 = . J.- ....,,a L g9a ; o 1 i -, i I I[ i~ [ T. -~t*+h IIC Y..,i107h. y 7 - MC OH %,0 3ON1INnOOit r.. 4t++g-'.+ + A R hp'.h "H-66 -+ -++b"; tp~h kT4 m,4.+ A_. F. ud~ ya

• .p m

&7 t+e . 4 4 4.'....,m -r ~+-.y . '... ~. -td-+ d b + ~ H. ec %' y',r r.- p o T'"P M M* '* a t bt -* - ++t 1 -+ t yna tso o sacul oluonII r+wg--A i. t. h, = M: nPO ... m m+ 9 7+

v. it., t,t,tt W, b.u

.e. m e. w_ -.i .-.,i i e. i. i n.im- + +L s.2..m m y i-P.!._._g.p.-. w p., .h, L. .c ..% pt,. uw ..w....,_ ._.._...i...g.m.%..... p o m. +.[t:'. t,..g a p .m m L . pa q. a -i.- e e. m--.- h- -f.-._- i.6 +j

a. -F:.

e .g. _, g.a.;.7 ,4.. 4 4

t -

r i1 1 ?.

l', l. } -.f g %_ E.-

.h. L .,.. b t.. g 4. ;. m t_, l. -3.- ., - f 1.. .]4,,! c t . --.- 4', a :_ .,. i,.,.._ -. _.,. .g - . 1 ~ o .o. { ;- 'i! L {~ -II-rmi .uJ..L.ig._.p'd,;ijf;. i b. _.,p. a +a% +.p-. m =.:.~.n p +g..-..w g ..a_. L- .a. _.g L.. _ a [t-ly

y

- o.,L 3 i t m

u e

m yi 4p

t. :p j

t q yh. M '

• 4.rr.:n.:.:

m r. - !:4 j. +rt a e - P nI i.--. 9;.n, 7r L t rr., u _:r~; 4

1M;

. m i h ~J.1: t - 'd%"..M..* i

d... *., r' l ". t,-

'f2

" "., _, _a.t, ' I.o.,. N.-' tM .' ', 9 .+."t'"'o,'..' +

q"n d + Us m

p._,

p. 4 u g._' +

'i -t + +- ++" e + _.m... i, . _n i. .. 4 m=u,w 4 o.n ,....g. a -. m4.a.a. p.A .e. v p-.b.4 gq. _.p_,_, L j F.2-, o } o 4i . +. e i a s a . +; 4,_Q, %p;h.L,p. ,1.+. + -;A}.- *4 - p; i.. ob > iM M., g1 ..p .1 +. t. e w-LL41. i., s.Jm4... -.N 't.-. m w, m.N is. 4_ _; '1 i;, m . ~,.... ,.41 4.U ,. p.1 -- a .4 . p.. 1 u m m9 t M...... g.- .e. g ,4 4@+ _ - ..l .d. vw $.t. y.p.. f' q.,7.. -4+g. + o., -...-7.H _ g tI,...g ' N ..y7b. M_.m m c. 3+ .M.. 4...q. d i - ( b i -.> E o, } } ; -4> .e .p A. {. g. L .p ....,g.4 _i... 4 _..' p{ ..r._... .o ^ 7 i: 1 , ii s ; m.m M,.p... o .. q r q m.q,g.a. m 9, @ g# m_ .,...q c 4 4

p.,,.

.4.. . 1..' 1.~1@,,.b +e. v.4,.. - -- j -,h}+ 4, i p.4.M,;,., ,g . p ;. ;. g $.a mI. 1 . j .n j .1. .i 4 ..p.. 1E'. p 4: r w

...3*

1._ f i.< t,, m ~w, _,j1 46 2 4. i _~.[t ~.. .,z. ..q iJ#. i

m..

.n s..i -~H.1, . t :. i 4 t ....p-p:r.c.4 - _ pp HH e,e,.p ea H7..A... d g.. sii - , p ;j m.tp.. f : '..t 14 .d r.

i m

q .t 17 1 4 . :p. q,m.H li. - p 4..1-i.J, S p:q r m:- P t ; n ,r

L 3

n r . t, ip uH m- . n. nap e,.m _ h;*. i .: n j u L; .o rS. a.w" ; t..a. - e, - :=:;p: p +p = p: 4 p: r 1 =:.4 - irrHt u - m .elg p ..: t m.p ta h;.:

t h

n{:. t::: :.aq.t r.: .. gt 2= px g 1,h. t.a . :=h.: t.[ :; 1+1m.!

w..._

19 =tr ;=.: :p. e t@t-A"::n..i

LW u

. +.t,:r,::- =. a..: pr.. m +-

g a

m _ 4.p an m "p* a1p

*% y, y s h p. p p. +.~. q,y

%4. p 4y J.a.m'r;': - w* %.. .+ s. iau .7 4 -- d- -+tth-+ }++---nu ai' dN+&+rbrrisnad Em+h tirt n.4 yu -. .H g .1. p.;d . tM.a p m. + F.M, gF.4:,a 1

• l++ -

--lm t- - + - + - -m -*- t bJY +. - E ^ - -t +tc *- - tr~r-drT t2* t i-+--w+. . TMH &d.w i m %. n * *' E "; C. 2-t $ t.1- -+t tiTM +7 4* it,irm T.. 1i ihtl T ti-tn - itr,. E.. ,[ }{i

t.. )

.(.'i,. 6,f j '.

• }

1 t pJg.t._.,~ .}. l .i 4 I!ii -,i !.' ' 5 .l4,,, ' l-j ' .4._ .r,.! m' . l'i' I !I .l..) 1...,u,I._s:i. .! +f -' q._ p. _mj.F.d p(o M,. 4 f i.1,:, %y.~.g. I g .y r. +4 3 7 +.. _. t,, 7 m q 3

1. .g.~

.3 H p: l a ;;. t . J4..7 1... 1 l itt s m ~ s, i N,.7 a :M. N.., q%,. q-p.9 9...r..q yg 9-m . H, q; L-7.;. 9g . _-. q c e l-3., 3 g .t 7 . g ..m,.7 7 ._,g< . hfh N ,, i, i

k. ; i

' + -.. _ --..' ' M__.d. 1. fil p ' j ;d - ! - i h '.n i 1 !'II r::i q -._g. 3: y _.{ i {t-ilg m i,.. j L.1_i r_ l-1+- Q

i. d. g

. 01. uan 1 rwa 3nuAa ao.u =. -t-r-

• +

x d m19. 4 e'mr

• 2,. i.

7.t MSOd 10S2 1Ad3 uN . -. p b t tMt = 3 ,J r }" N[" i d. n t al - ~ 1., F ~- I~ !1 !! y:q M.; $ U d38 3uvsa suV<'xnI C. : "U '. ; 1 0:t t!:t H: m H. p r LI (( !M} l J _l\\ { D.._ -. )d3N31HY1 ION S33ONGVHA ._g i 4e..m%.a +.... L.. -. . ;p., 4.,. g,. _ ;...g p ,... a. . _ - u,y_, .L.g. ~- _pg .q .a dao13alIo,A a3AIca( 1,wm,.,,, m %.+.. ,,.H... .a_ .. - y .m. o i g g 3 gi _ _q m. ,,. _g.g.., m .% ~..j 4,.A: i p.. g ..,. i. a,. 1.. i 3 . _t- . j ! i ]... p .3 j i ....j.. } 4,...,, ,3 . m 4 I t ].:{j - .. n,j.i : cn....i..__- i : .4 i ' ._r - i _i..+i e.[,4 y ..L L ;.1b!~....'._ j p:. i_.. d,.t._. i. !. '.,! f> r !1 411 4- .a

i

.e 1 -l r 1

t

.4l =,q... t t;. m. .p

;4j w., f,;. {.p;.,4..l.,4, I 4'.4

,.,,- i c + { { i a, 2 [.. j i

}.

+ 1-- ,j ;.p , L..L L-p d. b.. v ay a l. g..

et

... ;. L.._,..L.. 4 e 41 1 6.t 4 i ; eF s p g 4.. ..y . p.. y., m 7.g m o ,.. -y m.,,,..q. ..,4_$ t t t j . _. r. SQ h h.h1 g p-L. l-;!ij.31 f j E. t - -j j .- ktm !.* ' d:* b-r.p a w -1 i i: i g.t.u,_,.p ;.1 9. u., t;i. ' +j: ...: y i j 4 -4 i .a ,.a,...

t

i t m

- i i t . ! n. q +a,.-. j,= mj-

• i~!T;.

4 t i-i, a. t -[ i. t t - 1 i + ,1: t. - l- !;: : m

1. L :

tit ~ i i '_:,i ;

i 7

4; g w ,_j,t,.o' 1 I J 4 i - 3 al i i i f, h ). ~, ,'._I ,i 4 .,,fg[4ga 9 { =. f j, =5 4 1 - _,_ -,4 ^I i1 - cI f. l. } ; ; . ^.- I. 1 ..,,',a 'S 9 ( 8,t I 2 C y 6 9 t e 416 20 fo vL % ni tS st,M-6 d 6 d ,P 8 E.5 5 5 5 u &uuu M l ?5 %

• 89 W 9 s"

ae83w m v m3 o3S ,2 ,9 ,X,j i 9 > pp DOOHGINVIION DnuA3 30H d3016E/t - u.r 3-an e m a asv avan am anuas 4.g ) g. eym son avu smmm -- aes t' 2* as we r... -- -me3a a, ~ w.s a r,y o w ug a..s - l% - 4 g awa.www % e m n w..m a. ria. .a... ,1___.__.-.__ H+ 3 m.. w., a. om. . s n%.w m,~ m .w l l - - -}}