Fuel-Temperature Coefficient for Boiling Water Reactor Transient Calculations: Its Dependence on Reactor Conditions

For certain reactivity insertion accidents, the fuel-temperature coefficient (FTC) determines the major component of the feedback reactivity, which limits the peak fuel enthalpy during the transient. Some contributions to the FTC from the two energy groups typically used for boiling water reactor transient analysis and the dependence of the contributions on exposure and coolant void content are discussed.