ML20085E929

Final Deficiency Rept Re Possibility of Marginally Adequate Support Structure on Main Steam & Relief Valve Discharge Piping.Initially Reported on 751223.Addl Shock Arrestors & Restraints Added.All TVA Plants to Be Analyzed

ML20085E929
Person / Time
Site:	Browns Ferry
Issue date:	05/17/1976
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20085E900	List: ML20085E921 ML20085E925 ML20085E929
References
NUDOCS 8308170128
Download: ML20085E929 (3)

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!!r. !iorma C. !!onoley, Director Offico of InapEction und Enforcencat gpy U.S. I ucione Regulatory Cor.nionion  % .- ..

Region,.II - Suite 818 230,Penchtreo Stroct, IM.

Atlcntn, Georgia 30303 9

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Dear Mr. !!oucicy:

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yf 11RO*CIS FERRY UUCLEAR PLAllT UNIT 3 - REPORTABLE DEFICII2 ICY - .N '

l'OSSIllILIYY OF !!ARCIl! ALLY ADEQUATE SUPPORT STRUCTURE ON ',$

IfAIM STEA!! A1;D RELIEF VALVE DISCIIARGE PIPI!IG - IE C0!!TEOL O

NO. Il0ll27F2 (1A.h

, . ,, T Initial report of the cubject reportablo deficiency was rndo N' to G. R. Ylingler,1;EC-IE, Rogion II, on Docenbor 23, 1975, cad van followed by our January 20, 1976, lotter, J. E. Gilleland 'g if i k[.5" ,'8 4 .m l

to Donald F. Knuth. A second interin report una nubnitted to IT.C by our April 29, 1976, letter, J. E. Gillcland to Hornan C. 't j j#)

1:onolcy. Encloacd is our final report concerning this doficiency .

W (Encionura 1) and a copy of the Teledyne analyala (I'nclonuro 2) -

fj relating to this deficicucy. 4, j,:, j Very truly yours, f.: .h-3 ,,,3 J.j 7N44,,5.y ..

. $' t J. E. Gilloland J. .l.

Anaistant Manager of Power f";{O,'

'5 $ 1 Enclo uros -Wi CC:/Dr.E.Volgenau, Director d.f[."' J Offico of Inspection and Enforcenant {fi U.S. !!ucicar P.cgulatory Cocmission {1'i ,$

Unuhington, DC 20555 ,/.< ?:, /

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m On D"e n.ber P3, 3 7/S , an i n i t i al repor t was ra.!e to URC-0!E P T ion II --

In:.poe b>r , G . H. Klingler by T. V. Abi.atiello,T. W. B a rk alc7 on '1 3 . H. fiivlel.

The report was cR. i n o al i rume wi th b,i 15.Lion' A'i?$0' h5 (e ) *

'D u, s 2 :, the fin 11 report for this occurrence.

m iinM D.e.:e rli it i on of Oce u r 'ne e A

An rm:0 s~..i. o f t1m, p <.t. a. u,, .

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piping, uht"h wts dt.ne 7 Fe r ry rt i n <; te un l i n e s n na r el i e f 'alve d i: cirtre e J in conjunct i on wi th the propored :,ubsti tut. ion af two E C r onby rel i e f v'ilve tnat the for two Target Hock relief valves on unit 3, revealed S r:t r e ,>

I nt. ing pi o nc support of these lines was not adequate to prevent

.1 r< tn exceedind those reported in the FDAH. ]

7-Cnune of De fi c i enc.y. -

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Yhe W wnn Ferry pl:uit was ori gi nall y de ;i cned uni n,

thr> cJ r i t . r i t cet -

forth in the 1 %'/

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i<<.ne of Fa't' h3' 1.1.

,",2nce this con- did not '.d !r, -"' -

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the t.2 e l, nt rel ie f val ve d ;- c.i

.1 m-3 i y., ". .nd m , , t, -4 l o on ad a tt.h t , d' i e:d -=

nodel of 1hene 1,orceu .ns L o t, ava i l abl e > - -

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--n t md con-

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used in d .lgni ng for t hi s comitti on. rxp rl" nee ~ ~ i n f c c"' r i l~

5 pl ant d e s i gn h ul chi un th tt, w hi le l i n e" of i tn o- t.,pe do vibrate' -

=eg e.c r;turt up systems u.th l high pr- nu re c r i t. i c al s o t ~ bl ir.n n t, d c r.!n fo Lne

o. v-a e n')<nner, they :tabi1,ne

. I ,tithin a rhort pc.iod of tir.e and <'r. . -

w i t h i n t.hc endurance stras limit of the piping. Precent da malol and co:uputer sollyt. ion of the transi.ent J oading phenonnon, en corsi ~r' ed in conjunct ion wtth the other loadinbr con'li' lons C- <1 exist ing piping a upport' ~ -

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t h ow ., t i t . . o e .c, . . .

in the piping to be above the stated FSAR values.

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-Safet.y a . Thalications--

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rgle es dysis of the main cteam lines and relief valve di a r r, u :-~

r{ tow the maximum st ress to occur in the 26"x6" sweepolet im mbtir de

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U I on considering pressure, deadweight and other cuntained b ehknical o

e, seicmic, val ue ,

and rel ief valve opgrat ion , stres ses are above t he stated M

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. and near t.he yield stress of the material <tt c'eo:.gn uenperature" 4 -

ftssuming all these loa ls occurring simultaneo'""-l Y an'i <-

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7 tu(1e to cause a failure at the sweepolet, ta1 c1tw_eter nipe loss or

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s coo)an a.cen. lent could occur.

The emergency core cooling system is sized o read ly nit tgat,e such an accident. Hw ever, the pr.scibility t hat 'much a ' N S

failure cotdd h:tve occurred is very re ote e-ince me n n chest calculated i

W stress was still below that necessary to cause such a feilure. ---

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2 o o penerli)Llon, _of Corrective Act. ion Tc)cdyne lhlerials Research has conducted a new stress nnalysis for each main cleam and relief valve discharge line in all units at Browns Ferry.

The crit.cria of AU3I B31.1,19'/3 edition, including all addenda up to cummer 19'/S, have been used for this ana. lysis. Additional mechanical shock arrectors faction and restraints have been added to the lines for satis-of the criteria,

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l Mc Taken to Prevent a Recurrence l All TVA nuclear plants will be analyzed considering all 3cading conditions i

as required by the applicabic codes and SAR commitments.

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i OM DATE OF DOCUMENT DATE RECErt ED NO

, TDRIESSEE VALLET AlmIORITY 1-20-76 1-27-76 60069 LTH MEMO REFOH f OTHEN

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ACTON NECESSARY CONCURRENCE O ^ **'**"*"

NO AcilON NECES$ARY COMMENT By

!. CL A351F - POST OF F ICE F IL E CODE RfG NO DE SCR WTION (Ment Be Untlasse8*si agFERRED TO DATE RECElvf D BY DATE DEFruruary agPott /

ERDials FERRY PIMF UNIT 3 N C 1 '

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ENCLO5URES COPIES FOR NSIC TIC P9R LITOL SENT TO RBC10t4AL COORDINATOR hf) 5 Eb i .

REMARKS b e C0FT 101. MARTFIIta MIPC r

lV u s NUCLE AR Recut AfoRv COMMISSION 7oRM c 32sd a

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