サブチャンネルコードNASCAによるBWR燃料熱的性能評価の現状(<特集>第14回動力・エネルギー技術シンポジウム)

概要

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From the view point of near-future BWR fuel design modifications, basic demands in improving a subchannel code were summarized. It is required that effects of a design change in lattice sizes, spacer geometries, arrangement of partial length rods and other coolant mixing structures on the boiling transition critical power can be evaluated with sufficiently high accuracy. An experimental database is necessary for validating sensitivities of the critical power to relevant design parameters. Status of NASCA's component models and high temperature/high pressure experimental data was reviewed. Although a basic performance of three-field conservation equations in bundle flow geometries has been well proven, it was noted that more efforts are necessary in conducting high resolution experiments and improving relevant models of expressing detailed spacer geometries and partial length rods.
2010-03-25