ML19312B818

Interim Deficiency Rept Re Seismically Unqualified Valves. Valves Undergoing More Rigorous Requalification.Final Rept Will Be Filed by 791230

ML19312B818
Person / Time
Site:	Grand Gulf
Issue date:	10/04/1979
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:
References
AECM-79-112, NUDOCS 7911200458
Download: ML19312B818 (2)

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A *2nca, Georgia 30303 A :en:icn: "r. .. P. O' Reill/ , irect or Cent'2 men:

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poten:ial reportab'c deficiency ryar 'inc; *.;illiam ?r* ell supplied m.-

which may na: meet the se:. scie rquiraments of :he ri;;;nal purchac t ;;e c if :. -

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Pir: of tha :s'ev Loaas requalif t:?.:icn for rai'res includes deter-mina:icn Of na: ural frequencies of /alves having 2x:2nded : pwor'.;3 (i.e. , u3ter, air anc gnr 27 era .3rs', . Iqui;nen: *:hich ucs previcust-,

qualif12d :c he rigid :hru 33 3: fer scissi: icads =ust new be eitner requalified thru 100 F.: er 1:s n:.: ural frequency must be dete miaal r.d otner f t:ces utilized. atural f recuency rap ,rts in house for

'Jillian Pcvell valves talics:2d f r2quenc.es i::= appro:cimately 150 H: to 1'.00 Hz. Tc ascertain th2 c:uracy of chase repor:s; :nrae valves vera sele::e1 and fini:e elemen:,2nalysis v s L erfc =ed by Acton lab. The resul:s ct' A :an Lab analysia should have been v:.:hin 1G-20' of :he ori;iaal valvea, abta;.ned by iceci'. : sing :he ic-ne mass acched with 13 degrees of freed.=. 3ut the differences ran;ed -

f ::= 00-2 000'.' with scne f requencies ialling belev 33 F.:. $ 1nu this was net a vaii t comp trison, the da:a f r= the Panel'. : cor -

were input into 3echt al ?cver Ccrpo ration's 'E-lCL c::puter prr ;rr.

Again :he resul:an: frequencies *ere icv. *1111a: Fowel'. ta; can:2;;ed and requested to recalcula:c :nc natural f rceuenciea and asked :o review Ac ca's verk for errors. ?cwell identified sete miner Scdalinr, errors and performed so=e calculationa. Tae ze:ncdelegy 2;cd by

?ovell is accaptable. The original analysis were performed by Mi:-

'Jes: Technical for ?owall. For these types of calculations :ne supplier q or hia sub vendce is responsible for the accuracy of the anal.'si. }

7911200 i

- - - - - - - . 2. . a - - . . ...i s. _ . . _ . - . .

. . M1FSJ:PP: Pov/;:t .h Li ,a r c : M n

, offica of inapac:icn'L :nfor: 2cen:

'J. 5. :~uclear ?c;:la::ry Cc =. lJ C': ' ' .1.

3echt:1 only reviews :he .e:hclolag*/ and assures th:: 3pecif ca:ic .

parameters are et. Therefore, Pcuali eas reques:ed to e:c;ilain :N apparent discrepanc es. Povell : hen reques d Mid-N'es: :o reca':u- .

late :he frequencies and an outside consul:an: has been called .n.

. The resul:s of :he a:cve actions ar2 expec te d :a be re s ilab '.e f .,r .inal"s i s ,

the analysis comple:ed., and the de:er=ina:ica of reportabili:y :1:r..n :S2 teaning of 10 CFR 50.55(e) be made by Dece .aer 20. 1979. A fina;. m.ar: .; ; . .

be submit:cd at that ti=e.

• lery :ruly yours, f

Y-%

L. F. Dale

uclear Pr je

:ana;;2

.FJ/J3r. .se cc: Mr. T. 3. Conne r 'a c c : Cr. 7. C. Gi' abs Mr. R. 3. McGe!.ee ':r. Adrian Zaccaria tr. ::. L. Stampley d'r . J. ::. '..'a rd Mr. Victor S:ello , Jr., Dire ::: Mr. 1. L. sca :

Mr. D. :1. Lake Mr. W. L. Nail

r. T. E. Rea.4TH:S 00Pr c:a Mr. J. P. McCau;;hy Mr. C. K. McCoy Mr. J. C. Fuller File O

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