SAS4A/SASSYS-1 sodium boiling model for LMFBR whole core analysis

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5715857

Dunn, F

The SAS4A and SASSYS-1 codes use a common boiling model for the analysis of hypothetical core disruptive accidents and shutdown heat removal transients in LMFBRs (Liquid Metal Fast Breeder Reactors). In both codes, an integrated approach is needed in which boiling of the sodium in a large fraction of the core is coupled with single-phase thermal hydraulics for the rest of the primary heat transport system, as well as with fuel pin heat transfer. SAS4A and SASSYS-1 use a multi-channel treatment for the reactor core. Each channel represents a subassembly or a group of similar subassemblies. The channel model contains a fuel pin, its associated coolant, and a structure that represents a fraction of the duct wall. Usually, the average fuel pin in the subassembly is used to represent the whole subassembly. By using a number of channels to represent different groups of subassemblies, it is possible to represent a three-dimensional core with models that are mainly one-dimensional.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5715857
• Report Number(s): CONF-850810-4; ON: DE85005021
• Country of Publication: United States
• Language: English

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