908 高速炉における自然循環時炉心高温点評価手法の開発(OS11-(2) 流体工学・熱流体,オーガナイズドセッション)

概要

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Toward the commercialization of fast reactors, adoption of fully natural circulation system is being examined as the decay heat removal system from the viewpoints of economic competitiveness and passive safety. This paper introduces a new evaluation method for hot spot in core of fast reactor under natural circulation. The new method consists of three step analyses in order to include the effects of thermal hydraulic phenomena particular to natural circulation decay heat removal, inter-assembly heat transfer and flow redistribution in fuel assemblies and in the core by buoyancy force. The method was applied to an analysis of loss-of-external-power event and the result was compared with those by a conventional method and a detailed 3D simulation. It was confirmed that the proposed method can estimate the hot spot with a resonable degree of conservativeness.
2009-08-25