Three-dimensional BWR core simulator

The BWR Core Simulator is a static, three-dimensional coupled nuclear-thermal-hydraulic computer program representing the BWR core exclusive of the external flow loop. Provisions are made for fuel cycle and thermal limits calculations. The program is useful for detailed three-dimensional design and operational calculations of BWR neutron flux and power distributions and thermal performance as a function of control rod position, refueling pattern, coolant flow, reactor pressure, and other operational and design variables. A special power-exposure iteration option is available for target exposure distribution and cycle length predictions. The nuclear model consists of finite-differenced, coarse mesh, one group, static diffusion theory. Eigenvalue iteration yields the fundamental mode solution. This is coupled to static parallel channel thermal-hydraulics containing a modified Zuber-Findlay void-quality correlation. Pressure drop balancing yields the flow distribution. The mathematical models used in the program are described in general terms