A Preliminary Study on the Propagation of RCP Pressure Perturbation into Reactor Vessel Downcomer

In the normal operation of PWR nuclear power plant, a pressure wave perturbation is generated due to the rotation of the blades of a reactor coolant pump (RCP), and it propagates into the reactor vessel downcomer. In the APR+, an 'ECC Duct' can be adopted as an advanced design feature for the DVI in order to mitigate an ECC bypass fraction during LBLOCA and to prevent switching an ECC outlet to a break flow inlet during a DVI line break. The pressure wave propagation into the reactor vessel downcomer equipped with the ECC ducts was examined in the present study