Pipe runs for sodium coolant systems are satisfactorily simulated by simplified models with no more than 24 axial by 3 radial nodes, consisting of coolant, pipe wall and ambient nodal points. Beat losses from the insulated pipe to its surroundings are included by a constant heat transfer resistance from the pipe's outside surface to the ambient An explicit numerical integration method is used with these simplified models.nThe simplified models are checked against detailed 48 axial by 5 or 8 radial node reference models, which use a four-point Adams-Moulton predictor-corrector numerical integration method.nA generalized computer program, which is based on the selected simplified model, has been written for incorporation as a subroutine in reactor/heat transport system simulation codes.
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