ML18114A541
| ML18114A541 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/13/1979 |
| From: | Stello V Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7905100158 | |
| Download: ML18114A541 (3) | |
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'1 3 1979 Your letter-d~ts-;I March 30-t 1919~ ~"Sponded.to tht= $ho~ Cause,(irdef'
- of ~.arch 13., 197f:~ o.~ncernh1g tne* reanalysis rJf cGrtafo p1ping syste-:~
at the Surry Yflt..te?' Station..
- Thi~ letter ir~1uded. ~.mong others~ ycur position regard1ng the i.:se of son st.ructure interaction techniques-in
.. ~he calculation of the_ a::1Pli*fied respor,sf: spectr<1 for SutrJ Units J
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- anti* '.2~ : these* ta:hriiqt:es nad beet1 apym;ved for Surry->-*tmits 3 and,..
The.use ef so11 structure foteracti0n (SSI} techniques f~ development Df ai-:qilified ~ponse spectr;;; {!~RS} tc be ~ployed in reevaluation of.
pii}ing at Sltrry LT.its. l anci 2 i-s. acceptable in principal. The tlliC _
it~ff has examined th~:spec:ific methods*of ssr*ai<<i:lyses proposed by your ardlitect* -engineer, Stone & ~ehster Engineering Cc..,pany,. at their
,offices*in Bostoo..'. Based cu tbis ex.:!.i!:1~tici1 *. l...i!:.:-~!:!lie~~. t:i~i ssr.
analyses for Surry Units 1 arul 2~ utilizing an.*elastic*.half -space *
~el9 will be acceptable" pending appropriate dccumerctation,.-
Irap1enimtatim; of the SSI analyses *will require specification of ~coo-
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.s1s1.en-.. npu~.-pah,.... -=ters su~~l as ~.mer response spec.. { a anti assnc:rnt.e.,,
structural atld: piµing*systcm da!-fog v1l;1Jes. -1:f these '.<(f/;alyses'. are.'to.
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of s-everal 'sample ealcu1a1:1of!s perfo:-med Tir-st 0-1dth t~,W:i,!JifHil<*S~t.,,of.
FSAA spectra and ~1ng valt:S end than with a set of input,pm~amete:rs qased en sintJ1e httrl~tal a.id uncoupJ~tl. '¥ertical,resprsnse spectra *'1i1
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da:'4ling values should *.be cc.."1Pl!!te<l and reviewed by the staff.;. At a
~inir.rum. t~.se compariso~s should _tr: made by de-w:1oping ft.RS based on ea:d1 of the. two stts cif
- input parancters cited above at t!re spring line~
th~ n~iiting f1oor ami tb2 h:3.S:~ r.:~t r,;f tire cont~irm:©t strt1cti.n"C *
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- r-rn.c FORM )ls. (9-76) NRCM 0240
- U.S. GOVERNMENT PRINTl~G OFFICE1 1976 -
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Result~ of analys~s {ikaady ~'etfm"med for St.rrl"Y tlnits 3 antl 4 mtu' _h0 acceptable in partfa:1 m.. comp1ute fu1fillml!;nt of the ~hove comµurfaonsif.
If ARS dev,eJoped ft¥' Units-3 and 4 ~re to ht! utilh:ed d'h*t;1ctly for re... ova1uation of p*h,>ii'ig in Units l arid 2 a show1rig of $ignifieant structur*a1 simi 1arity $bmt1d C-$ mad~.*
SwefQ;*.Libr~1~y Go Hege of ~Jill 'lam <1J1d Mary Wil11~-nttm"'g, Vh"9irria 23185 D\\'J041 c!.J,... Burke Sincerely,.
_fi];~a3as5s~ f,or
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- NRC FORM :US (9*76) NB.CM 0240
- ui S. GOVERNMENT PRINTING OFFICE1-197f5 -
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. DISTRIBUTION Docket Files 50-280 and 50-281
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Local PDR P. Kreutzer
~1. Buchanan TERA Docket Nos. 50-280 and 50-281 ORB Reading NRR Reading V. Stello ACRS (16)
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~l<XKMI~MXMM J. Knight D. Eisenhut Mr. W. L. Proffitt B. Grimes V. Stello E. Cas'e Senior Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Ric~mond, Virginia 23261
Dear Mr. Proffitt:
R. Vollmer T. J. Carter lL Russell Attorney, OELD OI&E (3)
A. Schwencer*
D. Neighbors
- Your letter dated March 30~ 1979 responded to the Show Cause Order of March 13, 1979 concerning the reanalysis of certain piping systems-at the Surry Power Station.. This letter included, among -others~ your position regarding the use of soil structure interaction techniques in the calculation of the amplified response spectra for Surry Units 1 and 2.
These techniques hc1d been approved for Surry 1 Units 3 and 4.
We find that your approach as stated in your letter, appears to be acceptable. However, we would need to review the details of your soil structure interaction analysis before we can approve it.
cc:
See next page Sincerely~
Victor Stello, Jr., Director Division of Operating Reactors
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