Probably not. Here are the reasons:

• WRC107 has a number of geometric limitations (for nozzles on cylindrical vessels). Your trunnion geometry probably exceeds these limitations.
• The stress computed in CAESAR II is the stress along the centerline, based on the forces and moments (along the centerline). Adding these global analysis stresses to (empirical) local analysis stresses is a questionable undertaking.

I feel for a proper analysis of this situation, you're going to need a finite element solution.