Characterization of mixed N/G beam of the VR-1 reactor. (December 2018)

• Record Type: Journal Article
• Authors: Košťál, Michal; Losa, Evžen; Matěj, Zdeněk; Juříček, Vlastimil; Harutyunyan, Davit; Huml, Ondřej; Štefánik, Milan; Cvachovec, František; Mravec, Filip; Schulc, Martin; Czakoj, Tomáš; Rypar, Vojtěch
• Is Part Of: Annals of nuclear energy. Volume 122(2018)
• Page Start: 69
• Page End: 78
• Publication Date: 2018-12
• Subjects: 235U PFNS -- IRT-4M fuel -- VR-1 -- Reactor Dosimetry, IRDFF -- SINBAD -- Zero power reactor utilization; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2018.08.028
• Languages: English
• ISSNs: 0306-4549

Abstract

Highlights: Validation of the neutron spectra in VR-1 channel. Measurement of gamma spectra in VR-1 channel. Comparison of the experimental data with calculation. Discrepancies between calculational and experimental spectra. Abstract: VR-1 is light water zero-power reactor using IRT-4 M fuel with nominal enrichment of 19.7 wt%, equipped with the radial channel being directly attached to the fuel. Enrichment at the top level of the low enriched uranium limit guarantees that the larger part of non-scattered neutrons in the spectrum is coming from 235 U than in case of experimental reactors using enrichments between 2 and 5 wt% (e.g., LR-0). Thus, the measurement of the VR-1 leakage spectrum can be a valuable contribution to the validation process of predicted 235 U prompt fission neutron spectrum. Presented second set of measurements is confirming the beam stability at VR-1 and compares the agreement rate in neutron spectrum shape with two benchmarks; light- and heavy water filtered neutron spectrum obtained from spheres. Additionally, gamma spectrum was measured and compared with spherical iron benchmark and VVER-1000 core simulator. Presented measurements have the character of comprehensive characterization of beamline experiments developed at reactor cores with IRT-4 M fuel. Reported good agreement between the experiment and calculation confirm the methodology of using VR-1 as a Mock-Up experiment for benchmarking of high power reactors with IRTM fuel in the neutron transport experiments.