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- W97645009 abstract "The mixing of the high pressure coolant injected into a reactor cold leg pipe and the water in the reactor loop causes the temperature of water in the cold leg and the downcomer annulus to decrease. The transient cooldown of the water in the downcomer adjacent to the vessel wall is an important factor in determining thermal stress in the vessel. An analytical model has been developed to describe the phenomena of mixing between the coolant and the hot water in the cold leg and the downcomer for the condition of stagnant loop flow. The model divides the volume of the cold leg and the downcomer into several segments based on the understanding of the phenomenon and the governing physical mechanisms associated with them. In each segmented volume, a first-order ordinary differential equation is used along with appropriate mixing correlations to characterize the mass and energy balances. By satisfying the boundary conditions at the conjunctions of the volumes, the differential equations are solved simultaneously to yield the transient cooldown history of the water in each volume. The model predictions are in agreement with data obtained from the EPRI/CREARE 1/5 scale model facility and the EPRI/SAI rectangular geometry fullheight facility." @default.
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- W97645009 date "1983-07-01" @default.
- W97645009 modified "2023-09-27" @default.
- W97645009 title "A mixing model for transient cooldown in a reactor cold leg and downcomer under stagnant loop flow" @default.
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