ML19259C382

Responds to IE Bulletin 79-07 Re Seismic Analysis of safety-related Piping.Forwards 790419 Ltr from Nuclear Svcs Corp & 790420 Ltr from Teledyne Engineering Svcs

ML19259C382
Person / Time
Site:	North Anna
Issue date:	04/24/1979
From:	Spencer W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
289, NUDOCS 7906160070
Download: ML19259C382 (11)

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vincia ss a e n.t giseic aw.s poe t a e omea aasv. #icatmos*L. vinaissa 79 APft25 Al0: 2D April 24, 1979

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L P. 0Wh Jr marmuur ,

';r. .grwis ?. O'Relliy c. M. UPRiad Serisi No. 289 ref f 't e of Inr.pection and F.ofor cernent P.o.cHtnetta F5EbC/WCS:bkr W. S. KENW

.S. Nuclear *etegulatory Cesarisalon

.tgion I1 ((D MURPHY Doeket No 338 )

I:1 *istletta Strcet. Su*te 3300 J.T. suit.tetAso Lu.cwtn . ., License lio. NPF-4 Atl nta Georrin 10303

e, Mr . O' T:e 11 t y :

"IE BULLY.11N MO. 74-07 N0r.Tli 5I. iia ~55iUTATIOfi'tINIT 1 IE Pu))et in 79-0; recuented certein infornation concerning seismic No computer endes have been identified inie sis ef . s t e t y-rcinted piping. (S&W) which used any of the methods that w. rc u sied by St: ne & Web'it er Nuclear Services Corporation (NSC) leur$btJ in item 1 of the Bulletin. 1) did not use ban conftracJ that their version of N1* PIPE (see AttacismentFurther. Toledyne any of the m. thods described in item 1 of the Bulletin. 2) that their "ngiwer ing .tervices (TET.) has confirmed (see Attaclewnt f

. i 'i t of ADI.PifE did not simploy any of the methods dameribed in 3 tem 1 o t'n Itu lle t in. Westinghouse has confirmed that the WESTDYN analysis combined

'n r tzontal and ver tical shocks absolutely, which is dif f erent from Ites I ut 1E Mullet in 79-07. This method is Theidentical WESTDYN to the method seismic that would analysis is limited be *w.ed oday for a 2D evaluation. loop, pressur f rer surge line, loop stop valve, bypas r.a t b". reactor coci ant

.ir.a ar+d t ha w,in branch noceles. The North Anna analysis was performed

..ibsequent tn 1973 arsi the computer cods used is documented in WCAP-825?,

it. vinirm 1 accumentation of Selected Westinghcose Structural Analysis c.wputer Code *.". May.197 7, and is discussed in the TSAR.

In respense to 1tre 3, the following compu*er progra t he r:t is21e_

3. l'ST R E G E / SHOCK 111 03/03 - Steine & Webster THIS DOCUMENT CONTAINS

2. str1PE D3/03 - Stons 8. Webster

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NL7 f f'E - %eje ar Services Corpt. ration 4, Atil ;'i rt (4-1-7 2) - Teledyne Engineerios Services S. WTFTDYN - Westinghouse Verif trut ton of coat. uter pregrams (NUP:PE 03/10. PSIMSS/SIFKKl III 2nd

.t e4*) .

s. cd ty Stone & Ws hater is being addressed in respense te the Apri 7906160D'7 ()4 ,

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SH E E T 99.

venama euciv c an o roasa coupaw, to Mr . Jazze s F. O' Re fily addendum of the March 13th order To show Cause for Surry Units 1 and 2. S&V's in-house benelmarking between all major versitens of NUFIPE link versions -

03/03 to version 03/20.

As indicated in Attachment 1, NSC is currently ccepleting modelic6 and executicm of the MRC verification benchr. ark set for their version of NUP1FK. The results slould be available by the end of April.' It is our Under standing that the NRC has been in direct contact with REC on this subject.

As indicated in Attactment 2,1TS has completed a cooperisen analysie of ADLPIPE with THRSAP. ,

The Westinghouse WCAP-8257. Revision is containe results of the verification of WESTDTR against bencimark problems.

This should complete our respones to IE Bulletin 79--07. If etwre are any additional questions, please contact us. .

Very tr y yours, C

W. C. Spencer Vico Freefdent - Powar Station Engineering and Construction Services

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Attac tm ents ,

cc: Mr. John G. Davie, Acti:ig Director Of fioe of Inspection and Enforcenent , ,

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April 19, 1979 TELEC0PIEC y.-

T.1ups sw- 4lVITI We . c. Ten Milley Store and ' ebster Engineering Corporation N5 Sierr>er Street - Bth Floor P.0 t on t4A 02101 w Det- S'.r. Milley; Bulletin Ti It it.

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s letter is in response to questions concerning pr.inces a su-r.sry of pertinent infornation aboutAttach-ent I de ar. : verification.

f. - ',cisnic analysis while Attachment. 2 describes the s a7t.ese of ' love-ter,1973.* m ?d by Stone er.d v'ebster or. fiorth Anna Unit 1.

ed sigebrait l

Mta: bet 1 states that no version of NUPIPE has ever ierv oy is always r.et tan fer intra-Ndal or inter-modal combination of se c ";c ents. The cortribution of each cod!rectional co@dnent ,

t eined to trecrease the total response. ADLP2PE was used to verify 1:tei.hr<ni 2 indi:stes that the computer code The intra-redal verif f-combined

' . ; D i f or sirgte direction earthonake response. i lts.

t.v t. nd for ce,parison with tauPIPE r.ultidirectio

. . nc t 1973, the set of verification problems his expanded In addition. to twe

. "istituting a clicrough tep t of the various FWPIPE features.f the 11RC verifica

.ntinark set tt.e results of which should be ava. are t

.s e t r 5 by the end of April .

Very truly yours, g-h C. A. RandsVice Prerident and Of rvc

. Engineering ifcchanics J1/cg M ischte nts e

F' IlUCLEHR SEHWEES CORPDHHilull 4%to t ADR,EX cvneor. .a u .

I Attachment 1 Mthods enployed by NUPIPE fer seismic analysis ftUPIr!.. as initially issued in 1972. perfornd Response Spu.true analypt, as irollows:

1. Obtain eigenvectors h Hg = 1 for i = j

-o f or i / j

2. 04epute all responses 'rg' (forces. rionents, support.1 cads) for each vector q,/Wg 2

3. CtxTute nast participation factors and take absolute ve tues.

l ix*![*gxg! M E gy

• l[f iyMy!I ljy " l{6122)

4. 'Ctriute response in rnode 1(81

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) due to three-directions 1 earch-quake wit.h Spectral Accelerations 5,(W,). Sy (W g ). Sg(Wg )

Rg - r; (t g S,)2 + (Lg ,5 ,)2 + t ,$ .

5. The rrspense for all rwdes is then calculated as the trot-se 5,quan of tIIe individual redes, eacept for "close rede grr.ups wMch are ab' salute sur.rcif before RSS with other trdes and groups.

Labseq ent to 1972. the Step 4 calculation has been altered to ap' pear ast Rg a rg (Lg ,5 ,)r 4 (L g y5y)? 4 (Lg ,5,)

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Attactre.nt. 2

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7, WF3PE Dyrmc Verification b

b Dacuriented verification of early versions of h'JP,.>E is contained in Exlear Services Corporation report liSC-73D1 (June 10'3) fi) PIPE I Coscuter Prograr. VerH ice tion" and the Nowerter 1973 Addenda.

The tsmtents of this docuvnt with respect to dynamic analysis are it.e following.

1. A fRIPIPE venus ADLFITE corparison of frequencies, forccs, sxmacnts, displace:xnts, rotations and stress for X carthqua Ae l

and Y eart1;ouake excitJtion as separate Toad cases (thus, intre 2da'

" codircitional cteparison was net exac.ined in this enamole).

o p Torce tiene history analysis carparison of NUPIPE with the pubib!cd

, 2.

b sol > tion in the ASMI ' Pressure vessel and Pfping: 1972 Cor:Puttr Frogre.ms Verification- (A5NE Benchrerk Problem fio. 5).

)s 4 3. A saA;.1c problte in which individual coda! responses for X, Y.

5, 7, A*Y, Y+1 and 14Y42 were cair.ulated by TAJPIPE and by P.ard

(unno iter individuet K. Y. I results) to check bot.h in

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vs .iot s.at icn and int e -rn sis 1 c o 4.sistat ion wi th c lo.te t>> des .

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N 'O Exa:elnation of 11:15 procedure sha1, that the contributwn of estri of the three codirectional excitations always results in an increase in the total endal response.

If a NUPIPF user erploys the ground motion -

• history capability of h1JFIPE to represent a seismic event, NUPlh ould perfore a respc,nse analysis for the X and/or Y and/or Z accelcration-histories as supplied i by the user. The (signed) swent corponents at the time the resultar.t e moment was maxipus are saved (when the load case is finished) for use in stress calculstions. It is possible for a user to purposely run X, Y, and I time histories separately and coceine the thee separate (sicr.cd) )

results algebraically, bt.t this would be a rather unusual procedure, certainly not a " coded in" f ault of the ccaputer program.  ;

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'l /0 Mr. E. F. Shave -.

Suptryt:,or, Pf pe Stress 5 tone & IIebster Engineerir.o Corporation P.O. Box 2325 f;oston Massachusetts 02107 subject: U$f1RC Of fice of instection and Enfortement Bu11ctin Nurber 79-07

Dear Mr. Shave:

Teled.me Engineering Services has perfomed seisnic analysis of piping for your plant and therefore we are submitting the attached infomation to assist you in responding to the subject bulletin.

Essentially, TES did not use any of the rnethods listed in iten 1.

The nethods used by TES on your plant are described in Attactrnent 1.0.

The computer progran used on your plant was Aci p!PE, which f s cc rvrcially available through CDC. TES carmot Sr.1d a f ortran 11 stir.c of the ADI.plPE prosram since it is proprietary to Arthur D. Little.

A ctvrison analysis of ADLPIPE and TIMSAP is given in Atteclunt 2.0. This cow:parison is done for the snethod used by TES. rvnnino carthqual:e t'irections separately and cor.bining outside of the pregran.

lie hope that this inforrution will assist you in your response.

If you have any questions concerning this, please contact the writer er P.r. Daniel van Duyne.

~ .

Very truly yours3 T[ttDYNE EllGIllE ERING SCRVICES p.f(d b WAdt.tt M t:d Donald F. !.ariders inclosures Vice President sNGINCE Rs AfdD METAttVRGISTS

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$ /b c h c.f t t.re e c; the g:: n d c . r p n er. . . i sp : A..

P. p . r. ? :ysto.s ve re nr-1fred Tc r n y e , r. ( 2 hi ri:. r.6 ' v e r t.. ) a,'t- rnely.

1he represerstative ray.irum value of the t5rce roments Mx , Hy , and  ; M. at any point in the oipir.g systera subjecteri to each of the three ind?per:dini sp=tial co ponent response spectra was obtained by taking an SP.55 so r.atiori of the rudal respons,es for 411 significant rtdes of the sys ter.

• M3 thematically, this is erpressed as follows:

1 N 1/2 #

• M r

[t M ] (1)

' 3 ke l k w*iere H) is the repres entative noxirsum value of rmwnt, j is the termnt corpanent direction x, y, or 2. H is the peak value of rronent ccrpons.t 3k due to,the k" rude, and N is the nuter of significant rnodes.

The co.:bined ef fcct of the three spatial corgonents of earthauale The represer.totive wz !, deterr.ined subsequently by the folicaing procedure. M and M ) fro.v.

r:.-r.irvm values of the codirectinaal froments (either M,, y z thr- t*:0 hori7nntal components of earthqualc were conbined by the ERS!

r(fl od and this SR55 value then added absolutely to the representathe re).in.ra value of the codirection roment for the vertical comonent of Ihthtratically, this is expressed as cor t hqtral.c.

(Hj ) ]Il + (Hj )y (2)

Ej * [(Hj ) 4 is the total scistnic monent enrponent R,, R y or R (Hj )y,y,7 where My are tt.e r epr esent ative traxirvn values of codirectional twents (Sp.SS valur!.) for each of the X, Y, Z earthquel.e directions, respectively.

51* ce all tems are SR55 values, they all possess a positive sign.

This, is besically the equation given in the rwthods reports (References 1 a..:. ?) f or the plants in question.

r The only alternPtive to any of the steps described above that TES used in the piping selsr. tic evaluation in sort of the plants was a

'lir6tly conservative but rore e>pedient This alternativenethod consisted to evaluate of stress taking in the Clatt ? and 3 piping syster-5. and H, rrrents repi c s.e ri t a t i ve ra r.ir vn va l ue s ( $ P.5 5 o f riode s ) of the M, , My cr.:f co-bining thtra by the SR55 r.ctbod to detemine the ASME Code resultant l The tetal resultant rov:r,t tg for each spatial corponent of esrthauske.

t r ert P.8 was then deterr.ined .

by cosbining. _the

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. _ _ _ . . . . .resultant

.. rust.nts

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. # . i k-W TB_EDYNE TES Seismic Analysis M$thod DEMEWT1 ONClII' P4 rJe 2 for tach Spatial co conent of earthquake in a similar r. inner as dc5crIbed above in Lquetion 2.

Rg * [(Mg) + (H g )ff 4 (Hg )y D)

/.gsin, all terns on the rfpht side are SP.SS values and hence are ptsitive.

One ten see from the above procedures that there are no algebraic r.or.nstions (nvolved which could lead to unconservative results.

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nd exempic pruolem tnat. is easo usco in SAP

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X - Direction seismic Spectral topdino, 831.1 Stress .

( ADIPIPE Intensification $ tress, psj. _5

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Component

{ Nr.bor e 411 1.00 Run 1122 3

2.80 I Elbow 1105 3

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April 2.1, 1079 s

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4 Hr. James P. O'Reilly, 111 rector Serial No. 2%

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y 81' f ice of 3r speect ton and F.nferc emer.c FS'MC/VCS:cwh 5, ').S. Nuclent Regulatory Conninsien

< Mcgion II 1)o rket N s. 30 . 3f.

{ 101 Jtarlett e St reet, Guite 3100  %-TM

) Atlanta, Georgia 30303

.f 1.is cus e Ne. PR i 1 Drnr Mr. O'Re!!iyt D14- 3 I J IE BUL).ETIN NO. 79-07 .

SURin T 0WLR S1 AIION UNITh 1 AND 2

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IE Bulletin 79-07 requestcad certain inferination concerning scis?'.(

analysis of safety-reinted piping. Information regarding thin request har.

been and will he provided to you in conjunction with the NRC Order To Shw

. Cause of March 13, 1979.

Very tru yours, L .

FW I

W. C. pt.ncer Vice President - Fever Station

- Engineer ing and Cent t ruction Services t,I cc Mr. Jahr C. Davis, Acting. Director Of fice of inspection and F.af ors.tweent

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ff' Mr. lisrosa r Denton, Dire ctor Of fice of Nuclear Reactor Rn gulation p

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