Abstract
Abstract The transient performance characteristics of liquid metal-cooled fast breeder reactor (LMFBR) systems are strongly influenced by the energy transport in the piping interconnecting the system components. A one-dimensional coolant-wall model is used to simulate the thermal transport processes, with energy equations formulated by using nodal heat balances. An implicit scheme is applied to the coolant equation with an explicit formulation of the wall heat flux, allowing the solution to march in the flow direction. The impact of uncertainties in Nusselt number predictions based on generally used correlations is examined. For coolant dynamics, each pipe run between components is treated as a lumped control volume. From the transient cases studied, the following results are obtained: (1) The degree of axial nodalization required to obtain a converged temperature solution is bounded. (2) Time step control for numerical integration is most efficiently achieved by using the characteristic time approach. (3...
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