Development of a method and equipment for measuring the neutron flux from a research reactor
DOI:
https://doi.org/10.26577/RCPh.2023.v85.i2.04Keywords:
neutron flux, reactor, proportional counter SNM-18Abstract
In this paper, a new method for measuring the neutron flux using proportional counters SNM-18 filled with 3Ne is studied. When developing equipment for automated measurement of the neutron flux of the research reactor VVR-K, the determining optimization criteria are power consumption, weight and dimensions. For this purpose, devices were used for automated measurement of the equivalent of soil moisture and the equivalent of snow water by the neutron component of cosmic rays. A number of experimental studies have been carried out to determine the optimal levels of supply voltages, the design of the device for operation at the VVR-K reactor has been changed. The main elements of the neutron detector design are a block of a hydrogen-containing moderator; a tube of a proportional thermal neutron counter; an amplifier and a microcontroller for analyzing the signal from the detector; a high-voltage power supply and a transmitter. Special software has also been developed for simultaneous control of detectors. Test measurements of the neutron flux were performed at the research reactor plant VVR-K INP using a Pu-Be neutron source, with an intensity of 1.8 *106 n/s. To reduce the neutron intensity for the safety of personnel and to reduce the load on the detector, the neutron source was placed inside a boron polyethylene collimator.
Key words: neutron flux, reactor, proportional counter SNM-18.
References
2 B. Boyer & M. Schanfein, In Nuclear Safeguards, Security, and Nonproliferation, edited by James, E.D. (Elsevier, Oxford, UK, 2008).
3 G. Anzelon, Antineutrino reactor monitoring in the context of IAEA safeguards, In Workshop on Applied Antineutrino Physics (AAP 2018), (Livermore, CA, USA, 2018).
4 IAEA Department of Safeguards. Long-Term R&D Plan, 2012–2023, STR-375, IAEA, Vienna, Austria, (2013).
5 A. Shaimerdenov et al., Physics of Atomic Nuclei, 81(10) (2018).
6 B.M. van der Ende et al., Nature Communications 10, 1959 (2019).
7 Th. Blaich et al., Nuclear Instruments and Methods in Physics Research A, 314, 136-154 (1992).
8 A. Kozlov, D. Chernyak A large area detector for thermal neutron flux measurements at the KamLAND site, Nuclear Inst. and Methods in Physics Research, A. 903 (2018).
9 V.E. Aleinikov et al., Characteristics of gas-discharge counters of slow neutrons when operating in fields with a high level of gamma background, Preprint JINR, Dubna, P16, 97-158 (1997).
10 N.O. Saduyev et al., Acta Physica Polonica B51, 3, 887-892 (2020).
11 V.V. Oskomov et al., News NAS RK, Phys. Math. 294, 69-73 (2014) (in Russ).
12 V.V. Oskomov et al., J. Phys.: Conf. Ser. 936, 012047 (2017).
13 V.V. Oskomov et al., Investigation of soil moisture, snow water equivalent and glacier ablation using neutrons and cosmic ray muons, Research Report No. 0115RK01025, (2017).
14 N.O. Saduyev et al., Patent for utility model, («National Nanotechnology Laboratory Of Open Type » Subsidiary State Enterprise on the Right of Economic Management of «Al-Farabi Kazakh National University» Republican State Enterprise on the Right of Economic Management of the Ministry of Education and Science of the Republic of Kazakhstan), No 5797, (2021).
