Structural and coupling formulation for upper internals for LMFBR

The upper internal structures which are located above the core and below the head cover may play a significant role in the hydrodynamic of an energy excursion such as a hypothetical core discruptive accident (HCDA) by mitigating the slug impact on the head. For purposes of studying these effects, a structural model was developed for the upper internals and the support columns which connect them to the head of the reactor vessel. This structural model can be used either by itself or in an interactive mode with one of the hydrodynamics codes developed at Argonne, such as ICECO or REXCO. (orig.)