ML20234A874

Clarifies Items in 630815 & 30 Ltrs Ref Amend 4 to Util License Application for Proposed Nuclear Power Reactor at Bodega Bay Re Design Spectra & Reactor Structure

ML20234A874
Person / Time
Site:	05000000, Bodega Bay
Issue date:	09/04/1963
From:	Newmark N NATHAN M. NEWMARK CONSULTING ENGINEERING SERVICES
To:	Bryan R US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
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References
FOIA-85-665 NUDOCS 8709180173
Download: ML20234A874 (3)

Text

( ( i NATHAN '

M. NEWMARK 17os S. PLEASANT S T. , URBANA. ILLINOIS 4 Sept , ,_

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Dr. Robert H. Bryan,- Chief .. b ,

Research and Power Reactor Safety Branch & ,f. h' f /g'j; 2.

Division of Licensing and Regulation 2 . < 2 U. S. Atomic Energy Commission D ;h, g '3 Washington 25, D.C.  %

p Ref: DocketNo.50-gY k gile c) (D

Dear Dr. Bryan:

,.cyM bb This will refer to your letter of 15 August enclosing Amendment No. 4, dated August 9, 1963, to the facility license application f rom Pacific Gas and Electric Company for the proposed nuclear power reactor at Bodega Bay, California. This also refers to the letter f rom Dr. E. G. Case, dated l 30 August 1963, asking for written suggestions as to the necessary amplifica-tion of the above-mentioned amendment.

Because of the shortage of secretarial assistance, I was unable to get this to you at the time that I had expected. I trust that it will not arrive too late.

The further clarification that I think is required involves the following items:

1. The design spectra, described on page 2 of Amendment No. 4 refers to Fig.10, Appendix V, of the PHSR, converted by multiplying by the f actor 2.7. However, Fig.10 is rather crudely drawn, particularly in the low f requency end where the values are of importance in the design of some of the elements that will be involved. In my opinion, the values for periods of the order of less than 0.2 sec. may be grossly underestimated. I believe that the amendment should give the final values, after multiplication by the appropriate factors, and should give accurate curves for the actual values l of damping specified. in other words, I should like to see, sketched accurately on a graph where one can read values for short periods, the actual design i curves for the specified values of damping factors selected, so that one does not have to Interpolate nor make a multiplication by a constant value, in order to obtain the actual design parameters. l I

2 The second,' clarification concerns the items which are included I in the so-called " reactor structure." The sliding scale of damping used j therein causes some difficulty in applying the values to an actual situation.

This would be remedied by a drawing of the actual design values recommended for use, which would lump together all of the various parameters and give 1 one single design curve.  !

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3. . There. Is no statement;made $n page 3i as to how the critical

' equipment and systems'will be considered. For. example, the. magnitude of their damping or of.. the significant parameters that. will be used in determining .

their response, heeds: to be Indicated In some,- fashion.. ' in reading over the

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' amendment for'the first time:l~ got the ' impression that they were planning to use the large values.of damping applicable to the " reactor' structure,"-

but 'I hope that this is not what was. Intended.' ,

in' my opinion, If the above points are properly clarlfled, and' If '

a sufficiently accurate and conservative spectrum is used for the high, frequency elements, (those having.a.short natural period),- the riesign 'msis can be made adequate.. '

Res pect fui ly. submitted, h  %

N. M. Newmark' NMN:bJw e

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