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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

POST-DRYOUT HEAT TRANSFER IN SODIUM-COOLED FAST REACTORS

Get access (open in a dialog) DOI: 10.1615/IHTC7.3490
pages 441-446

Sinopsis

The heat transfer behavior of a heat-generating, dry, particulate bed from a postulated core meltdown accident in sodium-cooled fast reactors is investigated theoretically. The processes of combined conduction and radiation in the dry particulate bed and transient heat conduction in the structure in contact with the bed are modeled. Also modeled is the contribution of direct gamma-ray radiation to heat transfer. Results for the transient temperature distribution of the system are obtained by the method of successive approximation. Comparison of the approximate solutions is made to existing finite-difference solutions for simplified cases. Various post-dryout situations are considered and the conditions leading either to an incipient melting system or to a coolable non-melting system are identified. These are found to depend on four groups of dimensionless parameters, namely, the thermal property group, the radiation and internal heating group, the gamma-ray heating group, and the external cooling group. Numerical examples are given for a UO2 bed-steel structure system to illustrate the physical significance associated with each parameter.