hi^^
1. i input design temp...input box of vessel desing temperature in wrc 107(vessel stressintensity allowavle).
2. which is design tem and ope. tem ... exp forces in loads data tab ?
what's basis of that temp.?

Material allowable decreases with the increase of temperature. Thats what temp input is for!
Need to put Maximum temperature (Design Temp).

Hope that answers.
Regards,
salz