Studies of the Criticality of 20% Enriched Uranium Fast Critical Assemblies (FCA-I)

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概要

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• A series of critical experiments and analyses have been made on cylindrical assemblies fueled with 20 % enriched uranium metal in the JAERI fast critical facility. <BR>The first assembly contains in the core 10.8 % of stainless steel and 6.5 % of void by volume, and is provided with a natural uranium blanket 30 cm thick. Based on a number of correction experiments, the critical mass of the assembly was determined to be 94.9±0.3 kg of <SUP>235</SUP>U. With a reduced blanket thickness of 10 cm, the critical mass was found to increase by 16.4 %. When one quarter of the enriched uranium metal was substituted by graphite, the critical mass increased by 36.6 %. <BR>Comparison of these results with theoretical calculations indicated that the criticality of the assemblies can be well estimated by means of the <I>S<SUB>n</SUB></I> Sapproximation with ANL-635 set.

• 一般社団法人 日本原子力学会の論文

著者

• HIRAKAWA Naohiro

  Japan Atomic Energy Research Institute

• HIROTA Jitsuya

  Japan Atomic Energy Reseach Institute

• NAKANO Masafumi

  Japan Atomic Energy Research Institute

• NOMOTO Shoji

  Japan Atomic Energy Research Institute

関連論文

• Reactivity Measurements on Fast Systems with Natural Uranium Metal Blanket by Pulsed Neutron Method
• A Method Using Nuclear Emulsions for Measuring the Anisotropy of Fast Neutron Fluxes due to Arrangement of Fast Core Cell
• Studies of the Criticality of 20% Enriched Uranium Fast Critical Assemblies (FCA-I)
• Experimental and Theoretical Studies of Heavy-Water Homogeneous Two-Region System
• An Analysis of the KIWI-TNT Experiment with MARS Code
• Sodium-Void Experiment in Unit k-infinity Core
• Doppler Coefficient Measurements in FCA
• Analysis of Heterogeneity Effect by Monte Carlo Method

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