Issue |
EPJ Web Conf.
Volume 253, 2021
ANIMMA 2021 – Advancements in Nuclear Instrumentation Measurement Methods and their Applications
|
|
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Article Number | 05005 | |
Number of page(s) | 4 | |
Section | Nuclear Power Reactor Monitoring and Control | |
DOI | https://doi.org/10.1051/epjconf/202125305005 | |
Published online | 19 November 2021 |
https://doi.org/10.1051/epjconf/202125305005
Position evaluation of ex-core neutron flux measurement in new type graphite reactors
1
University of West Bohemia, Faculty of Electrical Engineering, Univerzitni 8, 30100 Pilsen, Czechia
2
Research Center Rez, Hlavni 130, Rez, 250 68 Husinec, Czechia
3
Czech Institute of Informatics, Robotics and Cybernetics, Jugoslavskych partyzanu 1580/3, 160 00 Prague, Czechia
Published online: 19 November 2021
Several concepts of new reactors use graphite. Some of them use graphite as a moderator, some of them as a reflector. There are at least two concepts of these graphitetype reactors under development in the Czech Republic. Both reactors use graphite as the reflector. An in-core measurement might be impossible to use because of various reasons, for instance, high temperature or aggressive environment. Therefore, this article focuses on ex-core neutron flux measurement system placed in the graphite reflector and the optimization of ex-core detector position. A set of experiments were performed at LR-0 reactor. The LR-0 is a light water reactor with a well-defined neutron field, which can be used for different material insertion tests and testing of its influence on criticality. Several modifications of LR-0 cores were modelled in Monte Carlo codes Serpent and KENO. A set of calculations were performed for verification of the criticality and neutron flux course in the reactor core and graphite reflector. Further investigation was focused on the influence of the presence of a graphite reflector on the neutron distribution in the reactor core. The LR-0 graphite experiments were also used to verify the calculations. Based on the results of this article, the optimal position of ex-core detectors in the graphite reflector is proposed.
Key words: ex-core measurement / neutron flux / graphite reflector / Serpent / KENO
© The Authors, published by EDP Sciences, 2021
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