Abstract
This paper presents methods and results of a theoretical investigation of sodium expulsion from a reactor core due to boiling using the basic equations of hydrodynamics and limited to transients which are slow enough so that coolant boiling occurs before the fuel surface or cladding melts. The model and computational scheme described in an earlier paper has been modified to permit: (1) Coolant boiling to start at an arbitrary point in the channel instead of only at the exit and (2) calculation to continue beyond the point of flow reversal at the channel inlet. The results of calculations for power increase and flow decay transients in typical oxide and carbide fueled fast breeder reactor channels show that higher coolant velocities and pressures are obtained with the higher power density carbide fuel.
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