Simulation modelling for dynamic performance studies in a channel model of a supercritical-pressure, direct cycle light water reactor

Dynamic performance studies in a channel model of a supercriticalpressure, direct-cycle light water reactor is carried out in this paper. In this supercritical-pressure system where some parameters are temperature dependent within the channel, neutronic and thermal-hydraulic calculations are carried out to define the distributions of heat transfer coefficient and power generated along the supercritical channel model. A linearized mathematical nodal model representing the heat transfer system is given for the supercritical channel. A digital-analogue simulation technique is used to study the dynamic performance of the channel model from the transient response of the fuel and coolant temperatures at different nodes in the supercritical channel model. Transient responses are displayed for different modes of perturbation of the system