Experiments and procedures for bottom-heating heat-transfer experiments through UO2 debris beds in sodium
Abstract
Real materials experiments in heat transfer through beds of UO2 in sodium have been performed at Argonne National Laboratory over a period of years. The most recent method utilizes the resistive heating in a sheet tungsten filament located at the base of the debris container. A schematic diagram of the apparatus is shown. The tungsten is clamped between two water cooled copper electrodes. The filament is a sheet of tungsten 0.15 mm thick, 5 cm wide and 18 cm long. Two 6.5 mm thick sheets of boron nitride sandwich the filament. The upper face of the upper boron nitride sheet is in intimate contact with the bottom of the debris container. Temperatures are measured at various levels in the bed as well as in the boron nitride plate. In addition, the sodium pool temperature is measured by the thermocouple. The heat transferral through the bed is measured by the temperature difference and mass flowrate in a NaK condenser located above the debris bed. The NaK inlet and outlet temperatures are recorded individually, as well as, differentially.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1982
- Bibcode:
- 1982STIN...8330975S
- Keywords:
-
- Containers;
- Debris;
- Heat Transfer;
- Sodium;
- Tungsten;
- Boron Nitrides;
- Copper;
- Electrodes;
- Flow Velocity;
- Thermocouples;
- Fluid Mechanics and Heat Transfer