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Neutron and Gamma Spectrometry in the Research Reactor LR-0

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ZARITSKIY S. OSMERA B. CVACHOVEC František MARIK M. POSTA S. RYPAR V. RIAZANOV D. LICHADEEV V. KOLROS Antonín MATĚJ Zdeněk

Druh Článek v odborném periodiku
Časopis / Zdroj IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Fakulta / Pracoviště MU

Přírodovědecká fakulta Fakulta informatiky

Citace
Doi http://dx.doi.org/10.1109/TNS.2015.2429747
Obor Jaderná energetika
Klíčová slova He-3 chamber; activation method; LR-0 reactor; neutron and gamma spectra; power distribution; power monitoring; spectrometry; stilbene; VVER mock-up
Popis The complex measurement system for the full-scale VVER models (mock-ups), created in the research reactor LR-0, is discussed. Fast neutron (energy from 0.5 to 10 MeV) and gamma spectra are measured in several representative points of the mock-ups by the two-parameter spectrometer with the cylindrical stilbene scintillation detectors. Measurements in the thermal and epithermal neutron region are carried out with the activation method using a broad set of activation monitors and with the He-3(n, p) counter. Activation measurements with threshold fast neutron detectors enlarge also the proton-recoil spectra measurements, such activation measurements are carried out especially in cases, when a spectrometer cannot be put in the necessary position. The core fission rate distribution is obtained by means of gamma-scanning of the fuel pins. The low noise precise power (flux density) monitoring system, independent of the operation control system, was developed in the LR-0 reactor for mock-up experiments.

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