Thermal Stratification Analysis for Sodium-cooled Fast Reactors: Development of the 1-D System Model

摘要

A 1-D thermal stratification model based on Berkeley's integral technique was developed and tested on three settings to mimic both ULOF and PLOF accidents in the SFR. For the case that warmer sodium entering a cooler pool, the 1-D model was completed with the Q'_(jet) calculated with the jet models as described in [3]. For the case that cooler sodium entering a warmer pool with the UIS installed, the 1-D model was completed with the Q'_(jet) calculated by assuming that the injected sodium was evenly dispersed in the ambient fluid within the distance between the bottom of the UIS and the jet inlets. The calculation with the 1-D model was completed within 0.3 seconds, and showed good agreements with the CFD predictions and the experimental data. For the case that cooler sodium entering a warmer pool with no UIS installed, experimental data was acquired, but a model of the Q'_(jet) remained to be developed.