A small break loss-of-coolant accident simulation with MC-PWR

MC-PWR is a microcomputer model for dynamic analysis of pressurized water reactor (PWR) plants. The model simulates all major components of the nuclear steam supply system of the plants with U-tube steam generators, and almost all control systems in the primary and secondary sides of the system. The plant model is based on first-principle formulations using mass, energy and momentum conservation equations for thermal-hydraulics, and point-kinetic formulation for reactor neutronics. Its operation was limited to single-phase flow conditions in the primary side. Currently is is being enhanced to simulate both single-phase liquid and two-phase flow conditions in the primary side to allow simulation of transients such as small break loss-of-coolant accident. In the secondary side the model still assumes subcooled conditions for the feedwater flow, and saturated steam conditions in the steam line. Drift-flux formulations are used to calculate vapor fractions in the different two-phase flow regions in both primary and secondary sides