An Accurate Transfer Function for the Dynamic Analysis of Temperature and Heat Release in Cylindrical Fuel Elements

A transfer function for the heat release in cylindrical fuel elements is derived. The time constants of the transfer function are given in curves as a function of the fuel element rod radius and thermal conductivity of UO₂. The average fuel element temperature, needed in connection with Doppler effect, is given as a function of the heat release transfer function parameters. Coolant temperature variations are taken into consideration.