Fluid-structure analysis for the HDR blowdown and snapback experiments with FLUX

Kurzfassung

FLUX is a special purpose code to analyse three-dimensional fluid-structure interactions during blowdown of a pressurized water reactor. Such a blowdown has been simulated in the HDR experiments. For the first series of blowdown experiments and for snapback experiments in the same facility the results of precomputations are reported and compared with the experimental results. Refinements are desirable with respect to two-phase-damping of pressure waves in the blowdown pipe and vessel wall flexibility. The general quantitative agreement between measurement and computation is satisfactory.