ML20210A204

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Comments on TVA 1973 Browns Ferry Unit 2 Torus Experience, Per 740521 Request.Rept Deficient in Five Listed Areas. Validity of Method Employed in Determining Adequacy of Torus Structure,Present or Modified,Not Justified
ML20210A204
Person / Time
Site: Browns Ferry, 05000000
Issue date: 06/26/1974
From: Tedesco R
US ATOMIC ENERGY COMMISSION (AEC)
To: Moore V
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20209J032 List:
References
FOIA-87-40 927, NUDOCS 8705050037
Download: ML20210A204 (4)
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Text

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i Yc m /.. .Ucarc, /.ns:in:.rrt "Irc: tor (c.r T ir,ht Uater enctorc, Group 2, L

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i, TV!i nEl'n".? "l?73 LPO'r " N.r.ny 1;':IT 2 7'?Ri:S OT:'ta!L:CC" (TAR-955) .

[ In accordr.nco vith yeer vor.uast of cy 21, 1974, the Contairrant e.p ten:

Lranch, Directorate of i.icensing has reviewed the nubject report. The

. repor t ha c enclicebility _to all I"7 c vith nrcsnure supntcssion. of the torun lir.htbulb type contal:rcuts. The c:uantitative fin <.'ints in the report are relovnat to the ';rorna Ferry plant.

i Th : report deceribec the results of a serico of instruncnted relief volve tests perfor: cd durix.c the startup of Brotms rcrry, Unit 1 in the period -

cf Ncn .1.or 8,1973 to January 11, 1974. Thic tect pror.rn. vns initinto1 aftrr ceae J,1-'c to tbn torus rine hende.r arrones eau had reruited f tue t.n a result of this d.= mane, and the l earlier.rclinf v 1vn e c ~t',

  • i en s.

encs.asive vi!,raticca th:t wre observed c' urin ~ rclici valve netuationa, .

r trait, c'nr ' cr.d lino:n elo-4 ty _dira'lacanint trnundaccre (i 5"r?) Jr.- 1 strtrentetton t.20 in tal. led on the torus and 0"Jt rips header to nernure q

81ra m nr.C % flo.ctienn of r.w ntructure, t'efor.' the testn v: ro etnrt 0 vinor correctione to rN ctructpral nt:pport of the tnruc ?.c.d 1. con pa?:forned.

These correct.i :n vara u:.cated once *:. ore durin : the ter.tr.

11 e rcculta of th:>. te:.; .m:c,re:.: ara ca:.~ia.cd to the ctructurn:. rcen ar. ':

of tho torus and rir..', l' -Mer. 7' e  : annie:it reayane of UC'T's nte v. c-n

in Ur for1 Oi retcat.cJ LP a I.racat, and t.nc MC .-'.v.c. etre c!.c r, d*
(ucc.' f rm i

the r.t rain Tn..murrnenta ore lir.ted in t.'bles. A tetal of 19 TN17'r: '

$7 c' vnein of strM 1 Mntr'r e:nta tJ cn t.c ra inu ta tinJ., in vil, f,fEtect r.ina vere perfor ed f er ec'.lch deta 1 vrerented con ~intiq~ or xinale r.'a i

t driaJ e ('.n t o -tr vapen c.baltce .;y) vn]vn test.s. *dl 11 n.,rer /

relief valven 4.:+:re actunt. d in the cc.orse oC the orn::ren 1 er any".mr hecucea 1 nr.J 24 oner.ir~ ter vr.1>c. with a tota.1 ef 93 v;;1ve newir.r.s, necutule.ted over the tect nra".rrui.

The revic's hv LS". in directed

- - at t'ne cen=ce:uence of tbo rcliof volve reti.in ac. i t ?cterd nas pr.wr.' n: ' re-wraturn con <litict- t o dri c't the cc: .i. >

systen in expo-:ed. I;n revie

  • of the ?,tretturni ren mune in ; <;ini, per c , ..

1:V .F 3.-., .

7;.e fir 'In '" o E t!- b revir cre cou:ctned "ith t .e e_ n mnc., e; t _

test pro;.ran in detcrra.inin;; tha loNiven in.nc ed on tha to*ue <na to re m f valve actu atirm. The sum nct : n e rer e," the rrw vt 4 W /.5 -

vr- en .. '- ,ra,P in n':ing thin deterninetton. Ir. :Odit i.m * , ecver:>l s e u mtien the r .-

'anda in the strer..= prerrs.n (Part II. of the rcrnrt'/ Mvc Lee.r.vi: ed.

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B'705050037 870428

THOMAS 87-40 PDR /. /, , , f" < -

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A b I'" & V . 7. ...

1/oss /.. Coore ~2-The findine,<: of thi . revf m are that the rerort ir deficient in a nn: bor of nrom niace itc en tent f r. c:.cIncively devoted to r.cacarortente of strece:en r.n.1 t'cfineu cmc. .Geveral 1::nortcut tc<:t pars:.terers are n,nt fn-

'.r. efuded 11 the tent results. The deficient crer.9 nre sirr.r.rized in the follet- ~

in:; five parn3rnphc: .

l. Conficnrotional informntion of the vent tubn from the valve to the-cxit in the torus r.hould be included f roa viiich the r.nior nar:r etern .

. af fcetiu the ttmmient liuted in : 72-W i4 can he dt.turnined. In addition, the loceMon, sine rM od bntr ent of the vr.cunn breche_rr, of cac't vent as : 01 oc the positioninc of the vent e dtn in the torus should be clearly indicated.

2. The ncntrer of the tent results cculd be nttv.thutable to vnrintion of certofu tent pare stern. *i: ;refcre, the styrtin cc.nfiqon fo:

caci tnnt. In ternn eT vnivo n on b tic e, mtor 1m'el end tcre. ~ r. ;nte i in tha vent -

and vent --

r'h s mro Pcc t,hould be proviled.

3. For the rm1ti4 vs1va e n its the open tn- Hr en of cach valve on en absolutn c-ic rolet!ve to ene another, in cddit.icn to tLe infor. cion ist 2, chould he providcJ.

. 4. The ir.f crnation on n_i- t or ni v-'ve actttutica cycinn over thn _Itv of th> pl.sut cc, contni::ed in '":.,1c 1 it, nur lict.ir.

'.r a' a c n c ' L.

reactor ogratinr, noi'es +are relief vnive(n) nre actunte:', r.r ' tf..

anticipe.tcl nir.her of c:xre.>.Jin. occurrt.nece ci occh t cJ.- over Ll-setrice 11:% of t.he @ nt haule ha inclu k/.. This bre thdo. a c.-c".'i I incluJu the tent rainirs . m ?. . cor tali.nont innMtion ith !..o. st: .

nr p]ar.t r.hutdorn, turbine trip. and reacter prensure tre enient:: .

5. 'Inlief valvan are rel f od ca frr cortrni of t' a nacll bro. ': lon :-+

coolt.nt eccidnu t f u the m . ii-rut.o. :r t ie islo. ....,-, . .od e . h thin <.r -

the biohcot strmner, to tie i torun etructure could rer. ult iro : t;--

i cur.cronaitf ne of coc.t: 6mnt prene.ure, cud .' cts.:n.tton ni n r:1-:d vsive st: at.iil ci:.r.ific :at prix.ry nyctna prosaurt:n. Therofare, ie dote:nindt.? tan ni~.or rcreur.19 in r!. c tort -.. t:ro .,cprroritiot M .

cad 1_treak LOCA aj valve a:cratica should bc cousinered.

The RM1ticeal inf or ">. tion, 5-4 recon-ideration of antu yttenn rMur" te.J in the para:.rnp.ut above la recJed to alle. to to Gro:"ine v: -:ther rc,rt + - t 7.'

ccadition: in t he torus for relic' ve3ve .:ccion b .vc been u ed in fot".r ':d r tito Ldet 43cv o#

Cl a torna r,tittture. Au over-i 'n> concein iith the e t_

rercita 19 that fro *r - ",t in t"nt ro M 5 c.ver tFn court > ei t' a tc t nvc ~

coul d c.3a.alb b r'un to :,l '"it v.' Ivc le .er enceuntered with r elte.- cent ra ,

vit!ch in Enwa rn rei.uca thn reverity ei vent cleario" inrin? -c} icf vii. .- i i

' s f f 6, e w ---- w-.--m- -m-- # - - * ---e -+---a -e+e- --n-e p.-<----m-+-.s +-yiq--- ,e--  % ---

'w--g-y -- w--- ---wy r 7- -'

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  • e Venn A. 1:r ore  ?, 6 L7'  !

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! netuntion. The. inforn.1 tion a Lc:' for in thin vrvict tdll enable a deter-4 ninntior, o f the v_ nyc.m :cr .*c ".:.inncc 1:. r*se "cr.t cinerira pM neren.9 nud cc.tr.!.lich t! e validity of presentl/ u- canerted en,cim-M en that n . cU c."

l ., . In prefere.ble to a rcachem vert cnit, nrd that rie rteni "- th vent 1 y

2 ft, or re!nen 1** of,the vent from ocction 'ioundarios to nid!nv in ti.e

, torun rection constitutet an i::grovenent, i

To the ente:t th::t the reclucr.tci' infornntion cannot he < inter::hed frce

, , c:tintin ; t.accurc :ents of Pr.it I tratc, the confira,tter r tc- pronr:u planneci for Unit 2 should he in9trimnted auch as to 71lt; eM , % -tc n. It in furt1Er~recen.: ended that pre :nuro f untrnrc " c*'c" m'lo"ts to th0 t e n t i ".~

l ' de.ierib d in _ VM-lOf..M Le iur.talic:1 for th!c tertin3. Pro trure oe ;. Illa-ro- clerrinc lc %3 i~no- d c:'

tionc t E to$ un ?:!sV t r nre nirect .r.>:stur.> of ti.c ver:tjn.iepenI'cr t of ntracturcl varintic,n ov ference of Re terve, fuch *::morcet vill fwccher cc: trihne to r resolutfon > the ncnerie ; ohLn of reitef valve rctuct!nn r. : a 1 M ir.

r: ode of pro :nure nurpresninn conteir.t ae.nts. i.t is rcco aender'. ti ot tvp2 ci:d IcVel of instri.',cnte.tica c picind, r. veil Fo a nuitchin tect rror.rt> fcr the 1: nit 2 tents be coordlanted trith thin bre.nch.

Cencric t.r.Jnroach b crphac1.v:d t.I.over further tm.f !w with cdditioned ir :tre entation,

r.ce.f fien12y , re: cure la i_1. w - tr. or.F.r to rm dr. c .w a iis .prebl:en of enliaf 'vrive : ction. Tue c:.t nt to s.htc': the r-t0 t c of a cuitnL3 c tout ::rc r: for ;.re n:r icrry 2 cr.ul,; :.y.:1: 7 te r" ? ' r> 1 v.: tni r .- 17 a r.ceter unich renalu m ;+ rc~nived.

I t du.ien0- en ti. : cie'rne ni r_t ru c_tu. r..ed qbilt rity b-f.rnou to teriin *:rve-tme : cd n' t O n e. tr l r. t M " c h .:c.. -~t?

unclernte.ndin;. of the penble : vot'Id in.llente that nn int o ncti_e cx! r:tr * -

t:.can pre n'tro . vli t o'e:. a n o r- :. .' b y rc11 r1 v .O - n.ctic,a , m.. st r. c .c t_r.1 --

charnetorfetics of tin. torut:. For thin ren m th,.r.rne~eral ebere.ererf.<:tfeu cuch e.o ri d it . t.. ;t f r e ." . .:rst , typr: c' nap...rt e c., "na]n h. rn b.2 concidor.- d .doro t:. - .en. lical.11f c:. of Vroene corry tor.ts te all t oruc t

r.tri:cturen cra be accorteim".. Im en e.lt:rrneere, r. var-1 T' I cle.at.

c:;.ci repr.-< c "r civc c.J : crts . cry of cuc.4 ple.n t n , rou.'. i Y.vi: to La ch , . . J out for m m r,te en :t n n r r.

tlc !! ark II nnd III plante s.ith reinforced concretc totecils cicarly r .rn"cr t

c. c. arate clar., of nierte .ha to the toreM - Ji m ~ nt c.trc;t r-1 c'.n - ~-

intic:. cd t'c wet.all.

. It i.. e:.ne c te.'. , w+ w r r , th c ri.m Ufc" tiv "

pra .un.. n; li tt s.n wid 17 ;. n ora te.1 in vQmr~j.ls f er the nn ' rM .

vc1 " c o N : urn e r.;- .'ac to the ;Jer.ter r!'!. ' Lv o! tbc ntructurn in t ___M.t, the pool in cent.ained. /.:.ter it in veter:;4 t".1 t ?ict .n ticJ anted prerrcr eq litu:5 cual:1 1.e critic:41 to ulcr.t cicM:-n it is racn <ndn.1 that a c  ::rtite te *PN in confi..uration re , rec.mtntive of thr~.n cl :e.n_.: n ni sn):mt- h- - __.

M-}M r.h'd .

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, I i C c lu.c.i..r r on..c.u.b h e.t. .C. op.o..r..t.

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In itt: prin t-.t forri th tcport des not aden i ttel" f untify the conc. l._ur.f onc --- -

!l theit trer. e c.d.? in strivira et toi-' . r*cdific.Sttno. The 7031dity of t!.e methest etc.sloyci in dstot :Inin;; the ndennec r of the torun f,tructi!re prencnt I or 1 odifiel, over the life of tha plat is not -luntified.

4 I! - 0.-ifr.nl einted by:

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  • r.chrt I. Tedesco if I'ohert L. Tedesco, /nnistent Director

,I for Contain~.ent ScTety

!.~ 111 rectorate of Liccani.nt; t

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f I h'.W UNITED STATES

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. ATOMIC ENERGY COMMISSION WASHINGTON, D.C. 20545

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FEB 3 6 574 D. J. Skovholt, Assistant Director for Operating Reactors Directorate of Licensing EVALUATION OF TECHNICAL REPORT " STEAM VENT CLEARING PHENOMENA AND STRUCTURAL RESPONSE OF THE BWR TORUS (MARK 1 CONTAINMENT)" (TAR-461)

Title:

Steam Vent Clearing Phenomena and Structural Response of The BWR Torus (Mark 1 Containment)

Originating Organization: General Electric Report No. and Date: NE00-10859, April 1973 Review Status: Complete In accordance with your request, the Structural Engineering Branch, Directorate of Licensing has reviewed the portion of the subject report and " Answers to AEC Questions, NED010859, Part 1" which concerns struc-tural response and stress analysis of the torus-ring header system. Our evaluation and findings are summarized as follows:

The analytical model of the entire torus-ring header system that uses bar members to represent torus segments is inadequate for dynamic analysis of the structure. Stresses due to dynamic effects in the vicinity of pipe penetrations could not be calculated since the model was not set up to yield detailed results in all torus bays. Measured strain data are not reliable due to faulty instrumentation. We conclude that the portion of the report concerning structural response and stress analysis is unacceptable and should not be referenced.

Experimental stress analysis should be emphasized for the investigation of stress and strain conditions in the critical area. Previous tests have been conducted primarily for obtaining the forcing function and .

distribution of discharge pressure on torus shell, strain and deflection measurements had not provided reliable data for analysis because of instrumental malfunction. It is suggested, therefore, that a test pro-gram should be set up for experimental stress analysis and more attention should be paid in instrumentation and measurements of strain and deflections T2CA5d .

D. J. Skovholt '5 f

at pertinent and critical areas. In addition, effects of cumulative damage and usage factor.due to previous tests should also be con-sidered to avoid possible fatigue failure in future.

""9 R. R. Maccary, Assistant Director for Engineering l

Directorate of Licensing cc w/o ent.1:

A. Giambasso, L W. G. Mcdonald, L cc w/ encl:

S. H. Hanauer, DRTA J. M. Hendrie, L D. L. Ziemann, L L. C. Shao, L S. Varga, L J. I. Riesland, L S. P. Chan, L

!? , A-iG

. xh. b d 'h +.4'-

HQ4 40 2

3 3 TECHNICAL ASSISTANCE REQUEST /

TOPICAL REPORT REVIEW ASSIGNMENT I

From Project Manager / Date of Request:

Principal Reviewer:

Date Received:

To:

Ticket Prepared by: EEW Date: 2/5/74 f TAR No.: 46l Type of Req.: TA TRR SGR SR Other Orig. Ass.: New info.: Completion I Description /

Title:

Assigned to:

Branches:

P Req. Target:

Est. Comp.:

Status
- - from L L '===v ta D. J. # _^_1t dated 2/ M /74 l

l l Copies to. Deputy Director, TR TR Ticket File Requestor OPS Assigned A/D i

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