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Report No.
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Development of whole core thermal hydraulic analysis code ACT; made based on several thermmal-hydraulic analysis codes; Code abstract and development of inter wrapper flow analysis program

Otaka, Masahiko; Ohshima, Hiroyuki

We have started to develop a whole core thermmal-hydraulic analysis code ACT(Analysis program of whole Core Thermal-hydraulics) for the purpose of evaluating detailed in-core thermal-hydraulic phenomena under various operation conditions, e,9., the normal operation and the transition from forced to natural circulation, of fast reactors. For the high accurate predictivity of the in-core thermal-hydraulics, key phenomena such as inter-wrapper flow (convection through the gaps between fuel subassemblies) and core-plenum thermal-hydraulic interaction should be accounted for. Therefore, ACT consists of four kinds of programs, i.e., intra-subassembly, inter-subassembly, upper plenum and primary loop (including intermediate heat exchanger) analysis programs, which will be made based on several thermal-hydraulic codes that have been developed at PNC and taken the verification and validation. The latter two programs are inevitable parts to give the proper boundary conditions of the in-core thermal-hydraulic analysis, especially in the natural circulation decay heat removal operation mode. These four programs will be coupled with each other and be calculated simultaneously by using parallel computers. In this report, the code development strategy and inter-wrapper flow analysis program which we developed as the first stage of the code development are presented. This program analyzes sodium single phase flow phenomena in inter-subassembly gap at whole core. The finite differential method is applied and the governing equations for fluid continuity, energy and momentum are solved simultaneously. The basic function of program was confirmed through the interwrapper flow analysis of a core consist of 37 fuel subassemblies. This program will be coupled with inter-subassembly analysis program at next stage.

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