ML20234B767

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Amend 4 to Application for License,Adding Details Re Facility Earthquake Design Criteria & Superseding Matl in Preliminary Hazards Summary Rept of Amend 2 & Paragraphs 2 & 3a of Part III of Amend 3 to Application
ML20234B767
Person / Time
Site: 05000000, Bodega Bay
Issue date: 08/09/1963
From: Crane P, Gerdes R
PACIFIC GAS & ELECTRIC CO.
To:
Shared Package
ML20234A767 List: ... further results
References
FOIA-85-665 NUDOCS 8709210072
Download: ML20234B767 (6)
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BEFORE THE UNITED STATES ATOMIC ENERGY COMMISSION g 7lkh ~a copg _ .

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er 7 In the Matter of PACIFIC OAS Docket No. 50-205r  !

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AND ELECTRIC COMPANY Amendment No. 4 jg 6 l cd

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, Now comes PACIFIC GAS AND ELECTRIC COMPANY (the Company) and amends its above-numbered application by submitting herewith Amendment No. 4. This amendment sets forth further i

.i details with regard to the earthquake design criteria for Unit j No.1 of the Company's Bodega Bay Atomic Park and supersedes j the material set forth on page 8 of Section V of the Preliminary .

Hazards Summary Report (PHSR), paragraph 21 of Amendment No. 2 'l 4

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to the application, and paragraphs 2 and 3a of Part III of Amend- {

ment No. 3 to the application.

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The Company has established earthquake design criteria {

l for the Unit based upon the recommendations of Dr. George W.

Housner. In general, the usual methods of earthquake resistant design will be followed except that the lateral force factor which will be assumed as a basis for designing each critical structure, equipment or system will vary with the natural period and damping characteristics of the particular structure, equip-ment, or system.

The earthquhke design criteria for all critical structures, equipment and systems are based on the maximum credible earthquake ground motion on the granite at Bodega Head.

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  • e I C As set forth in the PHSR, this is equal in intensity to the ground motion recorded on deep alluvium at El Centro, California, on May 18, 1940, which had a maximum acceleration of 33% of

, gravity. This is estimated to be one and one-half times the '

intensity of the 1906 San Francisco earthquake at Bodega Head.

The specific earthquake ground motions upon which the design of critical structures, equipment, and systems will be based are, for acceleration,, the r,uctra shown in Figure 10, Appendix V, of the PHSR, con?crted for the maximum credible earthquake ground motion at Bodega Head by multiplying by 2.7. l The corresponding velocity and displacement spectra are obtained by multiplying the acceleration spectra by T/2 pi and T2/4p12 , l m

respectively. (T : natural period.) Stress levels to be used I i - in design will conform, where applicable, to the ASME Boiler I

and Pressure Vessel Code,Section VIII, including applicable nuclear code cases, the ASA Code for Pressure Piping, and the Uniform Building Code of the International Conference of Build-ing Officials, 1961 Edition (except that the usual one-third allowable over-stress for structures during earthquakes will not be applied).

The abode design will be based on the following s

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A damping factors:

Structure  % of Critical Damping i

Steel frame structures 25

- Reinforced concrete frame structures 4. 5 Reactor structure (See attached curve)

In i he event of earthquake ground motion equivalent to 66% of gravity critical equipment and systems will be capable of bringing the Unit to a safe shutdown. For example, particular items of equipment important to safety shall be designed to withstand such earthquake ground motion without deflection or distortion which would impair their functioning.

Critical structures (referred to as Class 1 Struc-l tures in Appendix V to the PHSR) include the reactor containment l structure, reactor refusling building, control building, and ventilation stack. Critical equipment and systems include the nuclear steam supply system inside containment, isolation l valves, liquid poison system, emergency cooling systems, emergency electrical power system, and the necessary associated instrumentation.'and controls. '

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! All noncritical structures, equipment, and systems l ,

will be designed.in accordance with applicable Company seismic l 3 q j

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design practices.

Subscribed in San Francisco, California, this 9th day of August, 1963.

Respectfully submitted, PACIFIC GAS AND ELECTRIC COMPANY By i d

Robe'rt L 'Gerdes a

President RICHARD H. PETERSON FREDERICK W. MIELKE, JR.

PHILIP A. CRANE, JR. .,

Attorneys for Pacific Gas  !

and Electric Company

! By . ,dh '

l l Philip'A. Crane,'Jr.

Subscribed and sworn to before me this 9th day of August, 1963.

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Rita J. Greepy Notary Public in l and for the City and County /or: ,,,

San Francisco, State of Cali.f,ornia; .,.

- My Commission Expires July 16,.'1987.1S.

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