Experimental studies of PWR primary piping under LOCA conditions

Tests have been performed on a 1/10 th scale model to study the mechanical behavior of a primary PWR pipe and the forces exerted on the neighbouring structures as a consequence of a break opening. A number of tests have been carried out with different pipe configurations (straight tube, elbow, S or U shaped tube) and different break types (single or double guillotine). The following aspects are investigated: - the dynamic behavior of the pipe and in particular the formation of a plastic hinge at the restraint; - impact function of a pipe on an energy-absorbing bumper; - lateral stability of both ends of a pipe consequently to a guillotine break. (orig.)