ML19305E040

Requests Addl Info Re Dimension of Upper Vessel Head Surrounding Control Rod Penetrations.Info Needed to Complete Work Being Conducted by Los Alamos Labs Re Vessel Strengthening.Drawing Encl

ML19305E040
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	02/28/1980
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Naughton W COMMONWEALTH EDISON CO.
References
NUDOCS 8004220192
Download: ML19305E040 (2)

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FEBRL'ARY 2 813E0 Mr. Willian Naughton Comonwealth Edison Capany P. O. Box 767 011cago, Illinois 60690

SUBJECT:

DATA h*Eiril Gi *HIIDESS OF LTPER PRESSURE VESSEL HEADS I

FOR ZIGi 1 AND 2 l'

Drawing number 686J374 of the pressure vessel and internals for Zion Units 1 and 2 which we received from you earlier shows an increased thickness of the upper vessel head surrounding the control l;

rod penetrations. The thickness of this section is not given in the N

drawing, but is needed for the work being done for us by Los Alamos on the strength of the vessel.

If you could supply us with this dimension, as shown on the attached copy of the drawing, it would be greatly appreciated.

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Sincerely, i

A. Schwencer, Chief Operating Reactors Branch 1 Division of Operating Reactors cc:

E. Reeves i

soo4sso/92-I

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