From: Michael E. Viola
Sent: Thursday, May 04, 2006 9:36 AM
To: David W. Johnson; Arthur W. Brooks; Bob Simmons; Brad Nelson; Frank
A. Malinowski; Hutch Neilson; Jim Lyon; John W. Edwards; Larry L.
Sutton; Lawrence E. Dudek; Marianne Tyrrell; Mike Cole; Paul Goranson;
Phil Heitzenroeder; Robert A Keilbach; Ronald L. Strykowsky; Steve
Raftopoulos; Thomas G. Brown; Wayne T. Reiersen
Subject: PORT OPENINGS and clevis alignment AFTER BEST FIT OF SKIN

Attachments: 65678-1-PORT OPENINGS AFTER BEST FIT OF SKIN.xls; 060503
65678-1-LIFTING CLEVISES.xls

When Major Tool did their first scan of the VVSA, it was on the 120 degree fixture and the belly was not included.  They performed a best fit based on that scan which they used to accurately bore the port holes.

They also used that same best fit to initially install as well as reinstall (cut off, realign and weld prep) the port extensions.

 

However, after the final scan performed for delivery a best fit was performed which made the skin better but throws the ports and support clevises off as seen attached.  These files may also be viewed on the ftp site I created along with the best fit: ftp://ftp.pppl.gov/pub/vio-vvsa/  They did perform a best fit of the vessel using the port flanges as the reference point but that put the skin much further out of tolerance.

 

I am not aware of the implications of this to the final function of the ports by the physicists but wanted to provide an understanding of how and why we have what we have and a heads up to the NCSX diagnostic team.

 

Thanks,

Mike Viola, PPPL, (609) 243 3655

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