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UNITED STATES COV.' AMENT '
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To Files 9
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' September 6, 1963 a
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Edson. G.' Case, As is J
<for Facilities irector ing, DL&R-1 SUBJEcr:
NEWMARK'S COMMENTS PG&E (BODEGA); ANENDDENT NO. k s;
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. Based on a telephone 'conversatico l
$1 following clarificationsDr. Beck and myself..Dr. Newmark be 1;j-e Amendment No. 4 ase necesand, additions to PG&E's F
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f.1. Spectra simi}ar to that given in Ngure 10 Appendix 5 of the Palininary Hazards Summary Re J should be provided for.2 5% and 4.5% af critical' d port Ii that the accelerations at low frequencies caTh n. order -
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identified.
that there is a considerable difference in(The basis f U
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between engineering seismologists as-to th l-u
. opinica such" curves at low periods'and at low damping e shape of.
.A, provided by PG&E requires interpolation and is plott d
.-The curve a small scale.-
e on regions which would be two or three times lower l
.u would think were appropriate.):
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" reactor structure" given on page 3: of Am'Ibe part 1
4-term be identified and the percent of critical dendment k should
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than referring to a. curve as is' done in thused for 9
j amping to be 4
4 Also, curves like Figure JD put en log log papee PG&B amen I
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- be provided for the particular damping f p
r should.
- 1' e basis for his concern on this part is hiactors to be used.
that although he agmes that 71/2% d s feeling.
a' reasonable number to usefor reactor structures amping would be-damping to be used could be as high as appre
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He does not know of any " reactor atmeture "e y 17%.
permit use of, damping factors this high.
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Files 2-September 6,' 1963-3.
The meaning of the term " critical equipment - and.
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- systems". should be clarified by indicating specifically, ql at least by examples, to what componeuts. it applies.
In any event, the damping factors for ecunponents such as control rod drives 'should be identified, and the nsponse
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spectra to which the damping factors are to be applied
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should bef given.
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September 6,1963 i
Edson G. Case Assistant Director for Facilities Licensing,'DL&R NEWMAIUC'S COMMENTS ON PG&E (BODEGA) - AMENDMENT NO,. 4 ~
Based on - telephone conversatica between Dr. Newmark.
Dr. Beck and myself, Dr. Newmark believes that the following clarifications and additions to PG&E's Amendment No.' % are necessary t-
- 1.. Spectra similar to that given in Figure 10 -
Appendix 5 of the Preliminary Hazards Summary Report.
should be provided'for 2.5% and 4.5% of critical damping.
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The curve should be pasened en log los paper in order that the acceleraticas at low frequencies can be readily identified. (The basis for his request is' his feeling that there is a considerable difference in opinion between engineering seismologists as to the shape of such curves at low periods and at low damping. The curve provided by PG&E requires interpolation and is plotted.ch a small scale. It seems to indicate to him, values in some regions which would be two ce three times lower than he I
would think were appropriate.) i.
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The particul' r components included within the term 2.
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" reactor structure" given on page 3.of Amendment 4 should be identified and the percent of critical damping to be used for the individual structures should be given, rather than referring to a curve as is done.in the PG&E amendment.
Also, curves like Figure 10 put en log log paper should be provided for the particular damping factors to be. used.
(The basis for his concern en this past is his feeling that although he agrees that 71/2% damping would be a reasonable nasber to use for rematar structures, the eurve provided indicates that st' low frequencies the l
damping to be used could be as hidt as appresinately 17%.
Ee does not know of ary 'reacter structures" drich would permit use of damping fasters this high.
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Files 2--
September 6,'1963 -
3.
The meaning of the term " critical equipment and.
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systems" should be clarified by indicating specifically, at least by exampass, to what oestponents it ' applies.
- In' any event, the daqing factors for compenents such as control rod drives should be identified, and the response -
spectra to which the damping feetors are to be applied should be given.
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