Abstract
RITAC (reactivity initiated transient analysis code), a coupled code of point reactor kinetics and thermal hydraulics, was developed for analyzing reactivity initiated transient (RIT) events of research reactors with plate-type fuel. Now, the code has been modified for pin-type fuel also. The code solves the coupled system of equations of neutron kinetics based on point reactor model and equations of thermal hydraulics for pin-type fuel to carry out safety analysis of fuel assembly. Point kinetics equations are solved numerically by piecewise constant approximation (PCA) method. In thermal hydraulics, mass, momentum and energy conservation equations for coolant region and energy conservation equations for pin-type fuel and clad regions are solved by Crank–Nicolson-based finite difference method. For the calculation of heat transfer coefficient from clad to coolant in different boiling regimes, a number of correlations are used in RITAC. Finally, results of the code are validated against the known results of a pin-type-fuel-based research reactor.
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