Reaction Rate Benchmark Experiments with Miniature Fission Chambers at the Slovenian TRIGA Mark II Reactor

Author:

Štancar Žiga,Kaiba Tanja,Snoj Luka,Barbot Loïc,Destouches Christophe,Fourmentel Damien,Villard Jean-François

Abstract

A series of fission rate profile measurements with miniature fission chambers, developed by the Commisariat á l’énergie atomique et auxénergies alternatives, were performed at the Jožef Stefan Institute’s TRIGA research reactor. Two types of fission chambers with different fissionable coating (235U and 238U) were used to perform axial fission rate profile measurements at various radial positions and several control rod configurations. The experimental campaign was supported by an extensive set of computations, based on a validated Monte Carlo computational model of the TRIGA reactor. The computing effort included neutron transport calculations to support the planning and design of the experiments as well as calculations to aid the evaluation of experimental and computational uncertainties and major biases. The evaluation of uncertainties was performed by employing various types of sensitivity analyses such as experimental parameter perturbation and core reaction rate gradient calculations. It has been found that the experimental uncertainty of the measurements is sufficiently low, i.e. the total relative fission rate uncertainty being approximately 5 %, in order for the experiments to serve as benchmark experiments for validation of fission rate profiles. The effect of the neutron flux redistribution due to the control rod movement was studied by performing measurements and calculations of fission rates and fission chamber responses in different axial and radial positions at different control rod configurations. It was confirmed that the control rod movement affects the position of the maximum in the axial fission rate distribution, as well as the height of the local maxima. The optimal detector position, in which the redistributions would have minimum effect on its signal, was determined.

Publisher

EDP Sciences

Reference20 articles.

1. Goorley J. T., James M. R., Booth T. E., Brown F. B., Bull J. S., Cox L. J., Durkee J. W., Elson J. S., Fensin M. L., Forster R. A., Hendricks J. S., Hughes H. G., Johns R. C., Kiedrowski B. C., Martz R. L., Mashnik S. G., McKinney G. W., Pelowitz D. B., Prael R. E., Sweezy J. E., Waters L. S., Wilcox T., and Zukaitis A. J., Initial MCNP6 Release Overview - MCNP6 Version 1.0, Los Alamos National Laboratory, 2014.

2. Snoj L. and Ravnik M., “Calculation of Power Density with MCNP in TRIGA Reactor,” in Proceedings of the International Conference Nuclear Energy for New Europe 2006. Portorož, Slovenia, 18-21 September: Nuclear Society of Slovenia, 2006.

3. Calculation of kinetic parameters for mixed TRIGA cores with Monte Carlo

4. Analysis of neutron flux distribution for the validation of computational methods for the optimization of research reactor utilization

5. Jeraj R. and Ravnik M., “TRIGA Mark II Reactor: U(20)- Zirconium Hydride Fuel Rods in Water with Graphite Reactor, IEU-COMP-THERM-003,” in International Handbook of Evaluated Criticality Safety Benchmark Experiments. Paris, France: NEA/NSC/DOC(95)03, OECD NEA, 2010.

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3