Dear Sachin,

There are two points of view here,

I see your point that if we are computing the stress intensities then we should compare them to Div. 2 allowables, which is the allowable limit for the stress intensity.

Typically, engineers for the sake of being conservative have used the Div. 1 allowables, as they were lower. But, after ASME increased the Div. 1 allowables in A-99, the Div. 1 allowables can be higher than the corresponding Div. 2 values for some elevated temperatures.

But, some engineers also believe that if the vessel is a Div. 1 vessel then use the Div. 1 allowables and if it’s a Div. 2 vessel then use Div. 2 allowables. As, there are many other requirements to satisfy for a Div. 2 vessel.

So, one can take sides on this issue. In CAESAR II, the Div. 1 material database is connected to the input. But, if you want to use Div. II allowables then you can type those in by hand.

So, it is up to the engineer.