分離共鳴パラメータの誤差が臨界性とドップラー反応度に及ぼす不確かさ; 感度解析用計算式の導出

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Author: 瑞慶覧篤ほか

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Publication date: 2005-02

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Note (General)：: Reactivity uncertainties such as effective multiplication factor can be estimated by the sensitivity coefficients of the infinitely diluted cross sect...

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Summary, etc.：: Reactivity uncertainties such as effective multiplication factor can be estimated by the sensitivity coefficients of the infinitely diluted cross sect...

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Material Type: 文書・図像類
Title: 分離共鳴パラメータの誤差が臨界性とドップラー反応度に及ぼす不確かさ; 感度解析用計算式の導出
Author/Editor: 瑞慶覧篤
中川庸雄
柴田恵一
石川眞
日野哲士
Author Heading: 瑞慶覧篤
中川庸雄
柴田恵一
石川眞
日野哲士
Publication Date: 2005-02
Publication Date (W3CDTF): 2005-02
Alternative Title: Criticality and doppler reactivity worth uncertainty due to resolved resonance parameter errors; Formula for sensitivity analysis
Periodical title: JAERI-Research 2004-026
Text Language Code: eng
Target Audience: 一般
Note (General): Reactivity uncertainties such as effective multiplication factor can be estimated by the sensitivity coefficients of the infinitely diluted cross section and resonance self-shielding factor to the changes of resonance parameters of interest. In the present work, the uncertainties of the resolved resonance parameters for the evaluated nuclear data file JENDL-3.2 were estimated on the basis of Breit-Wigner Multi-level formula. The resonance self-shielding factor based on NR-approximation is analytically described. Reactivity uncertainty evaluation method for the effective multiplication factor k$_{eff}$, temperature coefficient $\alpha$, and Doppler reactivity worth $\rho$ is developed by means of the sensitivity coefficient against the resonance parameter. Final uncertainties are estimated by means of error propagation law using the level-wise uncertainties. Preliminary uncertainty of Doppler reactivity worth results about 4\% at the temperature 728 K for large sodium-cooled FBR.
実効増倍率(k$_{eff}$)等の反応度の不確かさは、無限希釈断面積と共鳴自己遮蔽因子の着目している共鳴パラメータの変化に対する感度係数を用いて評価することができる。本研究では、評価済核データファイルJENDL-3.2に格納されている分離共鳴パラメータの不確かさをBreit-Wigner多準位公式を用いて推定した。NR近似に基づく共鳴自己遮蔽因子を解析式で表し、実効増倍率k$_{eff}$,温度係数$\alpha$,ドップラー反応度$\rho$に対する共鳴パラメータの感度係数から反応度の不確かさを評価する手法を開発した。分離共鳴パラメータの不確かさによる反応度の最終的な不確かさを個々の共鳴レベルの寄与に対する不確かさをもとに、誤差伝播則で全共鳴レベルに対する値を評価した。予備的な評価によると、ナトリウム冷却大型高速炉のドップラー反応度の不確かさは、728Kで、約4\%であった。
Source: /JAERI-Research-2004-026.pdf （fulltext）
https://jopss.jaea.go.jp/pdfdata/JAERI-Research-2004-026.pdf
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
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Original Data Provider (Database): 日本原子力研究開発機構 : JOPSS:JAEA Originated Papers Searching System