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@article{1760276,
author = {Losa, Evžen and Košťál, Michal and Štefánik, Milan and Šimon, Jan and Czakoj, Tomáš and Matěj, Zdeněk and Cvachovec, František and Mravec, Filip and Rataj, Jan and Sklenka, Lubomir},
article_number = {2},
doi = {http://dx.doi.org/10.1115/1.4048906},
keywords = {VR-1; fast neutron},
language = {eng},
issn = {2332-8975},
journal = {Journal of Nuclear Engineering and Radiation Science},
title = {Validation of the Fast Neutron Field in the Radial Channel of the VR-1 Reactor},
url = {http://dx.doi.org/10.1115/1.4048906},
volume = {7},
year = {2021}
}
TY - JOUR
ID - 1760276
AU - Losa, Evžen - Košťál, Michal - Štefánik, Milan - Šimon, Jan - Czakoj, Tomáš - Matěj, Zdeněk - Cvachovec, František - Mravec, Filip - Rataj, Jan - Sklenka, Lubomir
PY - 2021
TI - Validation of the Fast Neutron Field in the Radial Channel of the VR-1 Reactor
JF - Journal of Nuclear Engineering and Radiation Science
VL - 7
IS - 2
SP - 1-8
EP - 1-8
SN - 23328975
KW - VR-1
KW - fast neutron
UR - http://dx.doi.org/10.1115/1.4048906
N2 - This work aims to characterize the neutron spectrum in the beam going out of the university research reactor (VR-1) using tubular-type of the nuclear fuel, version 4M (IRT-4M) fuel. Thanks to its variability, the core is often rearranged to fulfill different research tasks. Measurements with new core configuration have been carried out to confirm the spectrum shape in the neutron beam of the radial channel remains unchanged even though the core has been rearranged. Based on this finding, the VR-1 can be considered as a mockup for other IRT-4M fueled reactors, even with higher power. The neutron spectrum stability has been proven by measurement and by comparison of measurements done on the C12 and C13 cores. Fast neutron spectrum in the channel has been evaluated by means of neutron spectrometry by scintillation detector and activation materials (Au, Co, Ni, Al, Fe, and NaI). If the neutron field stability is proven, the radial channel beam can be used for evaluation of spectrum weighted cross section disregarding changes in the core configuration. Assuming reactions with higher threshold, their rates can be compared with rates obtained in the pure prompt fission neutron spectrum (PFNS), since earlier measurements have shown that the neutron spectrum in the light water reactor cavity is equal to the PFNS above 6 MeV threshold. Result 1.1831 mb for 127I(n,2n) reaction evaluated from the VR-1 activation measurement demonstrates good agreement of the measured reaction rate with tabulated rate averaged in 235U PFNS, confirming the neutron spectrum stability and equality to the PFNS.
ER -
LOSA, Evžen, Michal KOŠŤÁL, Milan ŠTEFÁNIK, Jan ŠIMON, Tomáš CZAKOJ, Zdeněk MATĚJ, František CVACHOVEC, Filip MRAVEC, Jan RATAJ a Lubomir SKLENKA. Validation of the Fast Neutron Field in the Radial Channel of the VR-1 Reactor. \textit{Journal of Nuclear Engineering and Radiation Science}. 2021, roč.~7, č.~2, s.~1-8. ISSN~2332-8975. Dostupné z: https://dx.doi.org/10.1115/1.4048906.
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