ZAPP - a computer program for simulation of reactor power transients

Abstract

This report describes a computer program which simulates power excursions in experimental fission reactors. A point reactor kinetics model is coupled with a one-dimensional heat conduction capability which allows the code to determine reactivity feedback produced as a result of density and temperature variations within the reactor. External reactivity step insertions and ramps may be included in the calculation. A simple treatment of coolant flow is available. Test cases are provided including one which simulates a run from the SPERT series of experiments.