Importance Determination Method for Geometry Splitting with Russian Roulette in Monte Carlo Calculations of Thick and Complicated Core Shielding Structure

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概要

• 論文の詳細を見る

• In case of a shielding analysis of the geometry having thick and complicated structures with a Monte Carlo code, it is a serious problem that it takes too much computer time to obtain results with good statistics. Therefore, it is very important to reduce variances in the calculation. In this study, a method to determine the importance function in 3-dimensional Monte Carlo calculation with geometry splitting with Russian roulette was developed for the shielding analysis of thick and complicated core shielding structures. Only two essential importance ratio curves for one material enable us to determine the importance function easily in the shielding calculation. <BR>The validity of this method was confirmed through a simple benchmark calculation. From the comparison with the result obtained by using weight window (W-W), it was shown that the present method can give an accurate result on the same level with W-W method with less trial and errors. And this method was applied to an actual reactor core shielding analysis to confirm its applicability to a 3-dimensional thick and complicated structure. <BR>Using this method, the variance reduced calculation can be easily realized with the developed importance determination procedure, especially in case that parameter survey calculations are required in order to determine the shield thickness in a design work of a thick and complicated structure. Accordingly, it became easier to use Monte Carlo method as a powerful tool for a reactor core shielding design.

• 社団法人 日本原子力学会の論文
• 1995-10-25

著者

• SHIOZAWA Shusaku

  Japan Atomic Energy Agency

• Murata I

  Osaka Univ.

• Shiozawa S

  Japan Atomic Energy Res. Inst.

• MURATA Isao

  Japan Atomic Energy Research Institute

• SHINDO Ryuichi

  Japan Atomic Energy Research Institute

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• Performance Test Results of Mock-up Test Facility of HTTR Hydrogen Production System
• Importance Determination Method for Geometry Splitting with Russian Roulette in Monte Carlo Calculations of Thick and Complicated Core Shielding Structure
• Analysis of Control Rod Reactivity Worths for AVR Power Plant at Cold and Hot Conditions.
• Evaluation of Local Power Distribution with Fine-mesh Core Model for High Temperature Engineering Test Reactor (HTTR).
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