Nuclear data uncertainty and sensitivity analysis of the VHTRC benchmark using SCALE

被引：18

作者：

Bostelmann, Friederike ^{[1
]}

Strydom, Gerhard ^{[2
]}

机构：

[1] Gesell Anlagen & Reaktorsicherheit GRS gGmbH, D-85748 Garching, Germany

[2] INL, Nucl Sci & Engn Div, Idaho Falls, ID 83401 USA

来源：

ANNALS OF NUCLEAR ENERGY | 2017年 / 110卷

关键词：

HTGR; VHTRC; SCALE; Uncertainty analysis; Sensitivity analysis; CRITICALITY CALCULATIONS; CROSS-SECTION;

D O I：

10.1016/j.anucene.2017.06.052

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The Very High Temperature Critical Assembly (VHTRC) experiment represents one of the few data sets available for the validation of HTGR lattice physics. Within the framework of the IAEA Coordinated Research Project on HTGR Uncertainty Analysis in Modeling, uncertainty and sensitivity analyses of this graphite-moderated facility are performed as the validation reference to the prismatic MHTGR-350 fuel block calculations. Nominal multi-group and continuous-energy criticality calculations with the KENO-VI Monte Carlo code of the SCALE code package are compared with the continuous-energy Monte Carlo Code Serpent. Good agreement with a maximum difference of 250 pcm is obtained. The experimental data set, however, differs by several hundred pcm with the results of both codes when using the ENDF-VII.0 library. When using ENDF/B-VII.1 data, this difference is reduced to a few hundred pcm and the calculations lie within the experimental error bars. Uncertainties of the VHTRC multiplication factors due to uncertainties in nuclear data are determined with SAMPLER/KENO-VI of SCALE 6.2 and with continuous-energy TSUNAMI of SCALE 6.2. For all experimental configurations, the obtained uncertainty is found to be 0.58% when using ENDF/B-VII.0 data. The top contributor to this uncertainty is the average number of neutrons per fission event of U-235. With ENDF/B-VII.1 data, uncertainties of about 0.66% are obtained in particular due to an increased uncertainty of U-235 nu-bar in the latest ENDF release. When considering these nuclear data uncertainties, the obtained l sigma uncertainty intervals are overlapping with the experimental error bars. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：317 / 329

页数：13

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