ML18114A746
| ML18114A746 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 05/18/1979 |
| From: | Stello V Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7906290709 | |
| Download: ML18114A746 (2) | |
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MAY 1 8 1970 Docket tJos.&-2mb and 50-2[H Mr. W. L. Proffitt Senior Vice President - Pm,er
'Virnini a Electric and Pov1er Company
- Post Office Box 26666
- Richmond, Virginia 23261
Dear r1lr. Proffitt:
un May 14 and 18, 1979 in conference calls bet~1em members of tile MRC staff,
- VEPCO,' and Stone and viebster Eng i ileeri ng Corporation, the fo 11 mvi ng information i\\/as requested in order for the staff to review the proposed amp1 ifi ed response spectra for the Surry Pm'!er Statfon, Unit Nos. l and 2 site using soil structure interaction.
OP'l"ICSll>
.URNAME~
DATE~
- 1.
C1a.rificat'ion of soil properties used for the two programs REFUND and KINACT. (i.e., what values were used in VEPC0 1s previous submittais).
- 2.
Floor response spectra [basemat, operating fldor and spring-line of the containment {3% and J/2% damping}] assunring soil modulus at a strain level of 10* % and soil damping of 5% 9f critical. In addition, provide the floor*response spectra for 1 /21; and 35~ damping for the elastic half space model for the final iterated soil properties and for the first iteration soil properties *. This is a total of 18 response spectra. It is our understanding that some of these spectra have already been calculated.
3 *. (a)
- Perform SHAKE analyses to determine soil shear modulus
- . and damping average values (this has been done). Then vary the average modulus +50% and determine two additional sets of
- strain dependent soil properties using SHAKE.
The inputs should be the Taft and El Centro time histories as per previous analyses. Average modldus and dampin(~ values are the arithNetic average of the last iterations as determined by SHAKE using Taft and El Centro time hi story *inputs.
{b)
Use SH/I.KE to calculate spectra for oscillator ctamrings of 1/2, l, and_3 11ercent at the elevation of the base of the containment in the free 'ie1d to each of the ~hree sets of soi propert1.s d
1( \\
- t.,...
t' I
- I
- i...
1
.............,.. sr-1-v-ez *. 1.p,....,. *&*f... ~~S*l*r-1*:.. ~r,.. a:r.,1*T*HH*~.... *H",k-:.:.... ~.1.s:w.r.3.1;,,,l,lC".. em.ie. o es.................
- the si e spectra. T\\i s is. a tota 1 of 9 spectra,
- ... * * * ** *.. *.... * *....................... :***.. *... **.. *.......... *............ *........ * *........ *** * * * **.. 7 *~c!/i::;;,;;{cf * *** 7 o
... ". ".................... "".. "........ "...... ".,... "".. "..... "....... """".. """ ".. " ".... "... "........ "... "......... '=J... "....
- ta.C POilW 318 (!'"76) NRCM 0240 u.s. GOV~RNMBNT P'RINTING oP'P'rCE: 117! - 28D "'76.
Mr. w. L. Proffitt Virginia Electric and Power Company -
(c)
Using the 'artificial time history which envelopes the FSAR site spectra and the REFUMO/FRIDAY codes., generate floor response spectra- (base mat, operating floor and springline of the contain-ment) for' each of the three* sets of.soil properties derived in 3(a*) using.the FSAR damping values for. the structures and.
- oscillator dampings of 1 /2 and 3% ( 12 addi ti'onal spectra f.
. 4.
Provide. a copy of.the deck of computer cards which gives the time history of ground accelerations which you are using for the Surry Pl ant.-
- 5.
It is *requested that al 1 curves be drawn and provided on the same scale.
It is our understanding that this information will be available as a complete package for NRC review by abou.t May 23, _1979.
If you have any questions on this. subject, please let us know.
Sincerely, Orlgin*a1 Signed. By; Victor Stello,.Jr ** Director Division of Operating Reactors cc:
See next page. N~TR~CD, fTLBS, *
. _ DISTRIBUTION Docket Files 50-280 and 50-281 Local PDR NRC PDR (2)
V. Stello D. Eisenhut B. Grimes
_R. Vollmer -
W. T. Russel 1
, T. J.* Carter A. Schwencer D. Wigginton D. Neighbors C. Parrish I&E (3)
Attorney, OElD J. P. Kn.i gh t R. Deni.se J. Buchanan TERA ACRS (16)
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DSE:AD:ET Y'RPDenise 5/ir//79