Abstract
In this chapter, a nodal model representing the coupled core neutronics–thermal hydraulics behavior of Advanced Heavy Water Reactor (AHWR) is described. After linearization, the model equations are cast in standard linear state-space form and linear system properties are discussed. Then, a vectorized nonlinear model of AHWR is developed in the MATLAB/Simulink environment, which helps to understand the relationship between different variables of the system in a better way. Since the oscillations in spatial power are highly detrimental for harmless operation of large nuclear reactor, their presence in AHWR is examined for control purposes. It is demonstrated that the spatial control of AHWR is possible with the feedback of total power and nodal powers where regulating rods are located. Effect of output feedback on system stability is addressed using vectorized nonlinear model. Simulation results are generated for different transient conditions and the behaviors of delayed neutron precursor and xenon concentrations are also analyzed for each transient.
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