Application of the collocation method using hermite cubic splines to nonlinear transient one-dimensional heat-conduction problems

This report addresses the application of the collocation method using hermite cubic splines to nonlinear transient one-dimensional heat conduction problems

Generic considerations of LMFBR hypothetical accident energetics

The paper provides a preliminary assessment of generic accident energetics issues associated with alternatives relative to the reference (U,Pu) oxide fuel in liquid metal fast breeder reactors. The alternatives considered include thorium- and uranium-based oxide, carbide and metal fuel types. This assessment is made within the context of low probability, but potentially large consequence accidents, e.g., core-disruptive accidents

Argonne National Laboratory Reports

The present cladding-relocation model was applied to L- and R-series test conditions in which the pin bundles were small. The results were consistent with the experimental observation and with SAS calculations. One of the key assumptions of this model was that total pressure drop over the voided channel could be supplied as a boundary condition for the vapor-momentum equation. The parametric study of the total pressure drop was carefully performed for the FFTF-type subassembly, and the oscillatory pressure effect to the streaming sodium vapor generated by the chugging of the lower level of liquid sodium was also investigated

Argonne National Laboratory Reports

A simple conduction model with phase change has been developed for the transient analysis of a fuel pin based on average properties and lumped-parameter techniques. The transient behavior of fuel and cladding can be accurately described by simple analytical expressions that agree with conventional numerical approaches for under-cooling transient analysis. If it be assumed that the heat-transfer resistance between the fuel and cladding remains the same for both steady-state and transient periods, the phase-change problem for fuel and cladding melting can be significantly simplified. BY using the predetermined average overall heat-transfer coefficient across a fuel pin in the steady-state period, the average transient fuel and cladding temperatures can be formulated analytically. For loss of flow at constant power, the start of melting and complete melting for both the fuel and cladding can be estimated with considerable accuracy