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Memorandum To
- Files DATE: May 22, 1963~
FROM, :
R. H. B C ief Research er Reactor Safety Branch Division of Licensing & Regulation suaJECT:
MEETING G' CONSULTANTS ON PG&E BODEGA, DOCKET NO. 50-205 On Fay 17, 1963 a meeting was held at the University of 11.5nois with the various consultants to the Regulatory Staff on the Bodega Bay reactor' The following persons attended:
AD Clebsch, U. S. Geolcgical Survey Frank Neumann, Seismologist Nathan Newmerk, University of Illinois Mr. Robert Williamson, Holmes and Narver Troy B. Conner, Jr., Office' of the General Counsel, AEC Gerald F. Hadlock, Office of the General Counce',. AEC John F. Nevell, Division of Licensing & Regulation, AEC Robert H. Bryan, Division of Licensing & Regulation, AEC The Atomic Energy Commission staff outlined the regulatory process for. this particular plant and indicated the tentative schedule.
The consultants were requested to present preliminary drafts of their reports by May 27, and were asked to meet in Washingten, D. C. on that date.
Dr. Newmark stated that it was impossible for him to keep that scheddle. It was therefore agreed that all preliminary drafts vould be submitted by May 31 and if a meeting vere held in Washington, it vould be on June 12 at the earliest.
The attached outline of work was distributed for comments and discussion.
Dr. Newmark and Mr. Williamson vere asked to collaborate in vrining a single report.
Messrs. Clebsch, Nenmann and W.liamson proceeded in turn to make comments on the studies they had made.
There was cor-siderable discussion on the question of appropriate assumptions concerning earthquake intensity and ground motion and on the application of design criteria to various. features of the PG&E plant.
The following are the points of n jor significance at this tbne:
- 1. ' Geologists should continually (every two or three days) suyvey the excavation now in progress for indications
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of, faulting in the sedimentary layers. A 1c.rge amount; j
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of excavation work has already been done and erosio of the cut faces makes it difficult to determ n
or not faulting is evident. :Mr. Clebsch is having e er carbon 14 analysis made to determine the age of woo a
found in the sediments.
2 the past, a large amount of minor faulti e in so as to cause horizontal relative displacements up t occurred tens of feet.
Vertical displacements of a few feet are.
o-indicated by escarpments.
withstand relative pennanent displacements under plant.
e 3.
Dr. Newmark appeared to be in remarkable agreem Mr. Neumann's comments, which he made in an earli ent with meeting in Washington, to the effect that the plant er should be designed to higher maximum ground acceler tion (probably 0 5g).
vinced that a nuclear plant could be designed toDr a-withstand the vibrations caused by any earthquake 4.
Even though suitable design criteria might be d
' to protect against earthquake damage from vibrations to take earthquake motion into accou i
mpetent
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structural engineers who are familiar wi e design W
effects do not generally design mechanical syste quake Mr. Williamson in particular believed that th ms.
5 tion of special design criteria to important m e applica-features should be carefully reviewed in det il Dr. Newmark agreed with Mr. Williamson and
. echanical a
have technically qualified personnel who w i
g of handling design problems of this naturee capable 5.
It was suggested that sources of water for eme
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the earth would not cut off the supply of w
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rgency of reactor and emergency condenser.
o the greater storage capacity of cooling water whichIt was suggest building ' There was also some concern could
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ng might' rotate sufficiently to lift the inlet of the ead condenser cooling canal out of the water, m
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.The consultants asked that the.following information be obtained
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'd 1.
For what pennanent relative linear displacements and rotations is the plant to be designed? State the:
relative displacement which-vould be tolerable
- l a.
Under the reactor building.
b.
Between the reactor building and the turbine generator structure, Between various portions of the condenser cooling.
c.
water system.
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2.
What ground motions are t,o be used.for dynamic design?
Specifically, state the ground motion spectra of maximum acceleration, velocity, and displacement. StateLprecisely j.
the. design stress. levels to be used in connection with these ground motions.
3 What damping factors will be applied to various typical structures and components?
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R. Lowenstein E. G Case J. Newell F. N. h tson 1
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