ML20069A208

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Forwards Replacement Pages to SEP Seismic Review Evaluation
ML20069A208
Person / Time
Site: 05000000, Dresden
Issue date: 07/20/1979
From: Hall W
NATHAN M. NEWMARK CONSULTING ENGINEERING SERVICES
To: Levin H
Office of Nuclear Reactor Regulation
Shared Package
ML20069A188 List:
References
CON-NRC-03-78-150, CON-NRC-3-78-150, FOIA-82-399, TASK-03-06, TASK-3-6, TASK-RR NUDOCS 7907240319
Download: ML20069A208 (3)
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Text

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R.e : ~ ,s. s - 9. 4 1 0'$ 6 1 Draft 7/20//9 WJH i t = 1 [ Hydraulic tubing for control rod drives and their support ' 145 tor-operated valves mounted on piping less than 4 in. j f 34 i t. d i re ter (Settery racks 7 o,,, - . mn ...a n w u. .n ? -: ~ \\ ' Cable trays had'supp rts. -, v+.. j ~ p+. 999. _, auf &pQ$ jf*' Q s Electric.al '.e.spdipeopt;Qlo'ef. nets and e, quipment mounted therein . ~ !li)l ; e ? . W, c 4 . +.. w m - 4 m

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^^ ament - 8esed en the caeined -L ~'egertence and. f the W;,.;. Qlp % y yg)3. ' jtheS$dT the reviews and spot _P f $ P M,jKf*" ~f gg; l (p s n 6 , M,e eths M the.origine Aes'gn. W anel , and reemme reelsless and amendments M i th es e, M. y. N N. M W i' %f C h,/ w w_ analyses,'and. %,. =.w n_ M M.. r/ S

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?c a 'g ?G u,;q m ;2on comparlseos'wlth similar items, of agdpment and n i y m .m .o, q p.s - l t -g. gg sp g., y,; Weso In, othe,,r, mo, re' roc t ! gned reactorsi.It.ls our concluston ~ J & &ponents: A p,e..tt. W @Q.. M"; M h yO ;'g.. N.2@, m$., m. ] @. d- ^a t cW fQ.? dfV J ~%.

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p_S. Q., ' ,J, l O,..),9The structures an r, p.n al eral t.g o 'e.lements of the Dresden facility .t .,,g. ' y c y ' p p.. W.:..,;. %.m. g :. x, 4 m i ace.adeguate"to, resist'en earthquake with;.q;q,$$E.welue of acceleration of ....s v W qm. m - n. W L en c ,;0.2 gdw5th one possiblQAgggQ@g,@g;gMyg@ lier l. am.., i. 0-gg F v 1..,m:s*u***im*ionasnotedser4 m .w - "s-n i yy.nme ,w M. ~,2)wmThe. piping in'the fa.t. x 3cility.Is. adequate to resist an earthquake' A w ^ '.;- w%c t a v .,,.c W g,n u, e'S ..r . - ay;. .n: m g.. y men]0.15.e,ms witho.ut...,being strained,. beyond elastic . :M m wi th' en mm %y S..S. E' lue~of aboot 1 .a n

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w ML n;awy2@S;2;g with acceptable inelastic deformation. y;m vc7 : c,, n. .T; W ilmi tss.-t ' v .y ~ ta-to resist! v t f "y e Q -6 -i g. - -+ < v** r * ~4 .(-, s' y -e/ +1p,... %ca._c6gm.:.)m.ps. J y: yw~ g 499..'Q.f,My,Qy_havelnot reviewed In" d[ta'Il the as-built piping supports .' M (,AI W,we ., 7g jgWyNWQMr~~ ^m* .e to determine 'that they ars., fully in accord.with the design criteria, In our s,, Judgment.thepipinga'ndIsupports have sufficient margins of resistance to m _o resist an SSE sarthquaka"acialeration of 0.2 g without loss of function. a gt l' 1 ,a m.+

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3) Based upon the examination of selected equipcc.; that in our Judgment represents a lower bound with respect to seismic fragility. -e feel that the equipment in the facility is adequate to resist an earthquake with i

an SSE value of 0.20 g, and subject to satisfying several points which are ../. , m JW W discussed below, should remain func,y~m.

  • This conclusion is based upon jj tional.

~ ~ n* . ';;. s. ,2 ~ id. t } i considera. i!!o,n of modern criter.ia ',I'nvolving floor response spectra, especially 1}4 . ~-- - y .at upper, levels of the structures where empilfled motions might be expected, s .. -...x ,and wit.h ithe,. . s 3, lizat, ion that'the~un,c.....-d... e.rt.ainty. bound.for the seismic resistance rea . n *~ a, ?AWMV ..a n , ~ ofiegulpment Ltd broad. It'is felt that the' margins for demoge of equipment '? O 3: w q g q ; y 7 Q w eg; p ~3p ~ are probably less than specified by current criteria, but it is our assessment ~ .. [ he# whyd.t c (,&.e ~ C L possible damage shou.idwe d@lr. functional capability. OI c that.;t not im Ide recognize "W

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~c .4 V ; ;a, y.. ..~+* . x. g w :.y { that[less rigorous design criteria existed when the equipment was manufactured, u J? -J h>.,'yv. n. r; and,qw e'was,a,lso les.s attent, ion,pe,Q < d' in t. he design to support of equipment.. 49 ther l., .Y^ }.f'y, h. .'m; 's . s, ' o. _ [f.fZy ffE ? Y. _, ' _y ; , gfjf N r,, pg g

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+ The above conclusions are predicated on' the following additional 4 . r: n; w j polats: ' (~.m-cy y m g y y - ~ g FW. 17 t .. c.,. y .e m. 5 g a . m; w. a. i) That all safety-related electrical equipment in the plant is 7 ( p chachd to ensure'tha.t,~ adequate positive anchorage exists. Nh .,~. ;,, n.c.. +. s. x II) That remai,ning items identified previously are evaluated and .ii w;q s.o upgraded if required. ~J 3,., , pf 3, + '3 -Ill) That a general reconnaissance of the plant be made to identify jk y

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,n .v and upgrade if necessary any overhead or suspended items which could be J. d. ~ L, %., >a r :p... Y? dislodged or fall during an earthquake and lgair capability of the plant -s 1 to shut down safely. l 'f l 1 . A 4 1 l ) M '7 S14 vh liv ' + t l f' .6 w _}}

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