ML18114A841

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Handwritten Calculations Re Steam Generator
ML18114A841
Person / Time
Site: Crane 
Issue date: 03/28/1979
From: Ondish D
Office of Nuclear Reactor Regulation
To:
References
OSC-790328, NUDOCS 7906290209
Download: ML18114A841 (5)
v • d • e


Text

    • -*****-.*,

e MA'\\f 1 8 191 Docket Nos.~~~~

and~---~

Mr. W. L. Proffitt*

Senior Vice Presi t.ient - Pm,ier Virginia Electric and Pm*,1er Company Post Office Box 26656 Richmond, Virginia 23261

Dear Mr. Proffitt:

On Hay 14 and 18, 1979 in conference calls tletw£~en mcr:ibers of the i~RC staff, VEPCO, and Stone and \\t!ebster Engineering Corporation, the following i nfon:w.ti on was requested in order for the staff to review the proposed anp1ified *response spectra* for the Surry Power Station, Unit Nos. 1 and 2 site using soil structure interaction.

L

3.

Clarification of soil properties used for the two oroarams REFUND and KitJACT, (i.e., what values ~:ere us~d in* VEPCO's previoui submittals).

Floor response spectra [basemat, operating floor and spring-line of tbe ccntairn;ient (3% and 1/2% damping)] assuning soil modulus at a strain level ~f 10-4% and soil d~rnping of 5% of critical.

In addition, provide the floor response spectra

'for 1/2% and 3i damping for trie elastic half space mode1 for the final iterat~d soil properties and for the first iteration soil properties. This is a total of 18 response spectra. It is our understand'in9 that sor.ie of these sp(~ctra have al ready been calculated.

(a)

Perforr~ SHAKE ana1ys0s to determine soil shenr i:10dulus and damping average values (this has been done). Then var_y the averaqe modul tis +50% and determine two additional sets of strain de~endent soiT properties using SHAKE.

The inputs s}1oul d be the Taft and El* Centro tii>se histories,1s per previous ana 1yses. /\\veraqe modulus and ctampi ng values are the ari tiir,ietic average of the last iterations as determined b.Y Sl-liH<E using Taft and El Centro time history inputs._

~900;t10 *~0 7 (b)

Use SHAKE to calculate spectra for osci11ator-dampin9s of 1/2, 1, and 3 percent at the elevation of the base of the containment rn tne 1 ree n e Io ror eacn or tne -c ree se*t.s or s )1, proper1:1 e

........*. tlS:.l':.i ~ed. in.3.(R.).. usinn..nn.. i!r.t.i.f.ic.i al :tir:ie.. histor.y.. 1hi.ch.. env.e.l.O.P.: *s.. :..... :...........

the site spectra. Th*s isa total lf 9 spectra.

o oo O o o O O oo o o *

  • O O o
  • O 00 O o o 00 oo.. eOO*OO O ooo OI oOOoOOOO oo o AO o O o O 00 00 0 O O O O O 00 00 IO O O O o. O O O
  • O O O O O *o
  • o o o oo o o o o o o o o o O O O O o 00 0 0 O O O O O O o oo O O o O O O O o oo o o o o 00 0000 00000000 O I

1UC J.IORM 318 (!>-76) NB.CM 02.<<>

"* U,B, QOV!!RNMKNT PRINTDNG Ol"fl'IC!t: 197P.. ZIii - 7Si>

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e Mr. W. L. Proffitt Virginia Electric and Power Company (c) Using the artificial.time history ~tich envelopes the* FSAR site spectra and the REFUND/FRIDAY codes, generate floor response.

spectra ( base mat, operating floor and \\springl ine of the contain...

ment).for each of the three sets of soil properties* derived in 3 (a) using the FSAR damping va 1 ues for the structures and

  • oscillator dampings of 1/2 and 3% (12 additional spectra).
4.

Provide a copy of the deck of computer cards which gives the time M story of ground accelerations which you are using for the Surry Pl ant.

5.

It is requested that all curves be dralin and provided* on the same scale.

It is our unde*rstanding that this informatiort'wi11 be*available as a coraplete

. package for NRC review by about May 23, 1979. If.you have any questions.on this subject, pleas~ let*us know.

cc: See nex~ page

  • DISTRIBUTION Docket Files 50-280 and 50-281 Local'PDR NRC ~DR (2)

V. Stello D: Eisenhut B. ;Grimes R/ Vollmer W. L Russell

/T. J. Carter

A. Schwencer.

1,/

D. Wigginton D. Neighbors

/

c. Parrish J.P. Knight R. Denise J. Buchanan TERA.

ACRS (16)

Sincerely~.

Qriginal Sign~d BY:

Viet.or Stello~ Jr., Di rector Division of Operatin!J Reactors J;

I&E (3).

DSE:AD:ET RPDenise 5/ /79

  • I

!aC fOIUI 318 (9-76) NRCM 02-'0

  • u *** GOVKRNMKNT PRINTING-Ofl'l"ICE: I G71
  • za1.. 711

e e

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D, C. 20555 Docket Nos. 50-280 and 50-281 Mr. W. L. Proffitt Senior Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261

Dear Mr. Proffitt:

May 18, 1979 On May 14 and 18, 1979 in conference calls between members.of the NRC staff, VEPCO, and Stone and Webster Engineering Corporation, the following information was requested in order for the staff to review the proposed amplified response spectra for the Surry Power Station, Unit Nos. 1 and 2 site using soil structure interaction.

1. Clarification of soil properties used for the two programs REFUND and KINACT, (i.e., what values were used in VEPC0 1s previous submittals).
2.

Floor response spectra [basemat, operating floor and spring-line of the containment (3% and 412i damping)] assuming soil modulus at a strain level of 10- % and soil damping of 5% of.

critical. In addition, provide the floor response spectra for 1/2% and 3% 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 ou~ 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 soiT properties using SHAKE.

The inputs should be the Taft and El Centro time histories as per previous analyses. Average modulus and damping values are the arithmetic average of the last iterations as detennined by SHAKE using Taft and El _Centro time hi story inputs.

(b)

Use SHAKE to calculate spectra for oscillator dampings of 1/2, l, and 3 percent at the elevation of the base of the containment in the free field for each of the three sets of soil properties derived in 3(a) using an artificial time history which envelopes the site spectra. This is a total of 9 spectra.

I: i

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' r.

r.

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e Mr. W. L. Proffitt Virginia Electric and Power Company 2 -

May 18, 1979 (c) Using the artificial time.history which envelopes the FSAR site spectra and the REFUND/FRIDAY codes, generate floor response spect~a (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 additional spectra).

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 all curves be drawn and provided on the same seal e.

It is our understanding that this information will be available as a complete package for NRC review by about May 23, 1979.

If you have any questions on this subject, please let us know.

cc:

See next page

I i

't i I t

f f

r. t e

Mr. W. L. Proffitt Virginia Electric and Power Company cc:

Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535 Richmond, Virginia 23213 Swem Library College of William and Mary Williamsburg, Virginia 23185 Donald J. Burke U. S. *Nuclear Regulatory Commission Region II Office of Inspection and Enforcement 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 May 18, 1979

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