Research on impact of cross section consistence and different covariance library in the process of uncertainty analysis

Jiayi XU; Xubo MA; Yixue CHEN

doi:10.11889/j.0253-3219.2018.hjs.41.110604

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Research on impact of cross section consistence and different covariance library in the process of uncertainty analysis

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Research on impact of cross section consistence and different covariance library in the process of uncertainty analysis
- NUCLEAR TECHNIQUES Vol. 41, Issue 11, Article number: 110604(2018)
- 作者机构：
  
  华北电力大学核科学与工程学院北京 102206
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;the Fundamental Research Funds for the Central Universities
- DOI：10.11889/j.0253-3219.2018.hjs.41.110604
  CLC： TL32
- Received：01 July 2017，
  
  Revised：09 January 2018，
  
  Published：10 November 2018
- 稿件说明：
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Jiayi XU, Xubo MA, Yixue CHEN. Research on impact of cross section consistence and different covariance library in the process of uncertainty analysis[J]. Nuclear techniques, 2018, 41(11): 110604
DOI：

Jiayi XU, Xubo MA, Yixue CHEN. Research on impact of cross section consistence and different covariance library in the process of uncertainty analysis[J]. Nuclear techniques, 2018, 41(11): 110604 DOI： 10.11889/j.0253-3219.2018.hjs.41.110604.

摘要

核数据是反应堆物理计算中最基本的输入参数，同时也是反应堆物理输出响应的不确定度重要来源之一。由于存在数值近似以及模型简化等原因，导致积分实验测量的截面值会存在一定的不确定度。为了更好地规范核数据不确定性分析流程并评估分析过程中相关因素对分析结果的影响，基于自主开发统计抽样法的SUACL程序，研究了影响核数据不确定性分析的两大重要因素：截面初值与协方差矩阵。利用三哩岛核电厂1号机组（Three Mile Island unit 1，TMI-1）栅元基准题分析两者对不确定性分析结果的影响。发现设定扰动一定，计算截面初值越大，引入的不确定度更大，且计算截面初值与截面的理论值越匹配，分析结果与参考值更符合。而基于不同核评价数据库产生的协方差数据下，分析的不确定度结果有明显偏差，以

238

U的裂变截面为例，基于JEFF3.2产生的协方差数据库分析的不确定度比基于ENDF/B-Ⅶ.1与JENDL4.0产生的协方差计算的值小4个数量级。说明采用准确的截面初值与基于与分析堆型相关核评价数据库产生的协方差数据对截面不确定性分析非常重要。

Abstract

Background

The nuclear data is the fundamental input parameter of reactor physics computation and it is also one of the significant uncertainty sources to the result of nuclear physics calculation. Usually

the cross section is measured by the integral experiment. However

the cross section obtained from the experiment is always imprecise due to numerical approximation and model simply in the experiment.

Purpose

This study aims to evaluate the effect caused by relative factors of cross section consistence and different covariance library in the process of uncertainty analysis.

Methods

The home-developed code SUACL based on statistical sampling method was developed for the uncertainty analysis

and the Three Mile Island unit 1 (TMI-1) benchmark was taken to evaluate the impact of both the initial value of cross section and the various covariance matrices.

Results

It is found that the larger of the cross section value

the higher uncertainty caused by it in the same degree of perturbation. Therefore

it is better to use the practical initial value of cross section. The uncertainty of infinite effective multiplication factor would be different based on different evaluated neutron data library such as ENDF/B-Ⅶ.1

JENDL4.0 and JEFF3.2. For example

the uncertainty of

238

U fission cross section based on JEFF3.2 is smaller four orders of magnitude than that of ENDF/B-Ⅶ.1 and JENDL4.0.

Conclusion

The appropriate covariance data and precise unperturbed initial value of cross section are critical to analysis uncertainty. Both of them have great impact on the uncertainty result.

关键词

Keywords

references

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