Debris bed heat removal models: boiling and dryout with top and bottom cooling. [Deep bed model]

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:5959032

Lipinski, R J; Rivard, J B

A one-dimensional deep bed model for incipient dryout is developed which predicts deep bed behavior but not shallow bed behavior. A fluidization criterion results which indicates that a debris bed cannot be fluidized by the vapor flow. However, the maintenance of channels within the bed is predicted. A top-subcooled bed model is presented and evidence (both experimental and calculational) is given that the top-subcooled zone removes heat in series (not in parallel) with the boiling zone for sodium-cooled systems. The Sandia D-2 and D-3 top-subcooled dryout data is expressed in terms of non-subcooled dryout and compared with experimental data and model predictions from the literature. The data agrees with several predictions depending on whether the dryout in the boiling zone is dependent on the overlying subcooled zone thickness. A bottom-subcooled bed model is also presented. A post-dryout model is developed to explain the stable dry zone observed in the D-3 experiment and agreement with the data is found. Finally, the top-subcooled and post-dryout models developed are used to make predictions for the upcoming D-4 experiment.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 5959032
• Report Number(s): SAND-79-0091C; CONF-790816-40
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ALKALI METALS
BOILING
BREEDER REACTORS
CORIUM
DEPTH
DIMENSIONS
DRYOUT
ELEMENTS
ENERGY TRANSFER
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FLUIDIZED BED
HEAT TRANSFER
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MELTDOWN
METALS
ONE-DIMENSIONAL CALCULATIONS
PHASE TRANSFORMATIONS
REACTOR ACCIDENTS
REACTORS
SODIUM