Structural response of 1/20-scale models of the CRBR to a simulated HCDA

The structural integrity of scale models of the Clinch River Breeder Reactor (CRBR) vessel and head under a simulated hypothetical core disruptive accident (661 MWs) is evaluated experimentally. Tests of three 1/20-scale models of the CRBR, each of increasing complexity, showed the effects of the upper internals structure (UIS), a thermal liner, and other structural details on vessel and head response. A fourth model, identical to the most complex model but with more instrumentation, demonstrated experimental reproducibility. Ni 200 simulated 304 SS, the material used to fabricate the fullscale vessel wall, core barrel, and core support platform; water simulated liquid sodium; and the detonation products of a low-density explosive simulated the HCDA core loads. Loading pressures, strains, and accelerations were measured. (orig.)