How about:
"Stress Indices, Pressure Design and Stress Intensification Factors for Laterals in Piping", 1988, by E.C. Rodabaugh for Welding Research council, PVRC Grant 88-14.
I do not have the WRC Bulletin number for this one but maybe I can ask Everett for it. This is a pretty comprehensive piece of work, so it would take a good amount of reading before you could gen up a spreadsheet. Like anything else, you have to understand the concept completely before you dare to automate it.
OK, it is WRC Bulletin 360
http://www.forengineers.org/cgi-bin/wrcbulletin/bulletin.pl?action=view;id=371
Regards, John
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John Breen