I've got a bit of a debate going on here and I need some more facts to work with.

Specifically, the WRC-107 module calls for Smc and Smh to be inputed from ASME Section VIII, Division 2.

These allowables are higher than those given in Division 1, which most vessels are designed to. The justification for the higher allowables of Division 2 are, first, a more rigorous design and analysis procedure, and second, higher quality control and inspection requirements.

Now, while it can be argued that running a WRC-107 or FEA on a nozzle connection constitutes a more rigorous analysis, you aren't guaranteed to get the higher QC in fabrication.

So, the basic question is - what is the justification for a blanket statement of using the Div 2 allowables, particularly in the case of a Div 1 vessel, or even a large piping connection designed to B31.1, which has even lower allowables?