2 research outputs found
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Three-dimensional simulation of diversion cross-flow between two parallel channels connected by a narrow lateral slot using the COMMIX-1A computer program
This report demonstrates the predictive capabilities of the COMMIX-1A computer program by simulating a fundamental experiment which determined diversion cross-flow and pressure drops between and along two parallel square channels connected by a narrow lateral slot. COMMIX-1A predicted correct trends and fairly accurate flow quantities with minimum empirical input
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Analysis of a PWR downcomer and lower plenum under asymmetric loop flow conditions
Certain postulated transient conditions in a PWR may cause the flow rate and the temperature of the coolant entering the core from one of the cold leg loops to differ significantly from those in the other loops. When the flow rate and/or temperature of the loops are not balanced, the resulting thermal mixing at the core inlet will become nonuniform, and the assumption of perfect mixing is not only unwarranted, but may lead to an erroneous prediction of radial power distribution. The objective of this paper is to describe the results of the three-dimensional steady-state calculations for the analysis of thermal mixing in a PWR. The specific case chosen for the present study is one of the tests conducted in the Oconee-1 PWR. Those tests were conducted to determine the extent of downcomer and lower plenum mixing in response to various temperature differences or flow imbalances between the two coolant loops. These tests were performed specifically to obtain coolant temperature profiles at the core inlet, core outlet, and various axial locations in the core under imposed offset loop conditions. The calculations were performed using the COMMIX-1A computer code