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TRACK II is a digital computer program for transient and steady-state thermal analysis of heat generating solids of arbitrary geometry which are cooled by fluid flowing through multiple parallel or series channels. The hydraulic and heat convection calculations are coupled with finite element heat conduction calculations to determine coolant conditions and material temperature distributions in a single computation. The primary application is to perform detailed thermal analyses of nuclear reactor components such as the reflector, the control mechanism, and fuel cluster assemblies under various operating conditions. A key feature of the program is the versatility of the flow network. Two independent groups of coolant channels are permitted and the channels may be arranged in series and parallel combinations. Additional features include an option for interface conduction between components which are modeled separately and a method to accommodate the effect of fast neutron fluence on component temperature distributions. This report presents the formulation for the transient thermal calculations and discusses the calculational models with.emphasis on the application of the capability of TRACK II for thermal, hydraulic analysis of complex systems. The;thermal analysis of the reflector system for the XE-PRIME NERVA reactor is presented as an example of this capability. Computer users information is presented,including program organization, input and output formats, CDC-6600 deck structure,and a sample problem.

TRACK II: a computer program for transient thermal analysis of flow systems with multiple parallel and series channels