Integrated Intra-subassembly treatment in the SASSYS-1 LMR Systems Analysis Code

Technical Report · Sun Nov 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/10197884· OSTI ID:10197884

Dunn, F.

A hot channel treatment has been added to the SASSYS-1 LMR systems analysis code by providing for a multiple pin treatment of each of one or more subassemblies. This is an explicit calculation of intra-subassembly effects, not a hot-channel adjustment to a calculated average channel. Thus, the code can account for effects such as transient flow redistribution, both within a subassembly and among subassemblies. The code now provides a total integrated thermal hydraulic treatment including a multiple pin treatment within subassemblies, a multi-channel treatment of the whole core, and models for the primary coolant loops, the intermediate coolant loops, the steam generators, arid the balance of plant. Currently the multiple-pin option is only implemented for single-phase calculations. It is not applicable after the onset of boiling or pin disruption. The new multiple pin treatment is being verified with detailed temperature data from instrumented subassemblies in EBR-II, both steady-state and transient, with special emphasis on passive safety tests such as SHRT-45. For the SHRT-45 test, excellent agreement is obtained between code predictions and experimental measurements of coolant temperatures.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: U.S. Department of Energy
• DOE Contract Number: W-31109-ENG-38; NONE
• OSTI ID: 10197884
• Report Number(s): ANL-FRA--167; ON: TI93020389; 196065
• Country of Publication: United States
• Language: English

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