If the loads that you entering are sustained (pressure and weight) then compare the stress intensities to 1.5*S.

If the loads are thermal or a combination of sustained and thermal then use approx 2S.

Also run WRC-107 and perform nozzle reinforcement calcs

At this time we do not ask the user about what kinds of loads are entered so we can not perform the comparison to the allowables. It is on the development list.