A personal computer (PC)-based simulator for nuclear-heating reactors (NHRs
), PC-NHR, has been developed to provide an educational tool for understand
ing the design and operational characteristics of an NHR system. A general
description of the reactor system as well as the technical basis for the de
sign and operation of the heating reactor is provided. The basic models and
equations for the NHR simulation are then given, which include models of t
he reactor core, the reactor coolant system, the containment, and the contr
ol system. The graphical user interface is described in detail to provide a
manual for the user to operate the simulator properly. Steady state and se
veral transients have been simulated. The results of PC-NHR are in good agr
eement with design data and the results of RETRAN-02. The real-time capabil
ity is also confirmed.