Effect of Operating Conditions of Main Steam System on the Hydrodynamic Loads

The structures, systems, and components (SSCs) important to safety shall be designed to accommodate the effects of the environmental conditions associated with postulated accidents, and shall be appropriately protected against dynamic effects that may results from equipment failures. As one of the equipment failures, pipe break should be postulated on the high energy lines such as Main Steam (MS) system, and the loads due to the pipe break shall be considered in the design of piping system to protect the SSCs important to safety. In this paper, the hydrodynamic loads induced by the pipe breaks are calculated for the MS line inside containment of Shin-Kori Nuclear Power Plant Unit 3 and 4 (SKN 3,4), and the loads are compared to investigate the effects of the operating conditions on the loads