Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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M. V. Saveliev^1,2, R. L. Godun¹, M. A. Pantin², I. S. Skiter¹, K. O. Sushchenko<sup>1,*

1</sup> Institute for Safety Problems of Nuclear Power Plants, National Academy of Sciences of Ukraine, Chornobyl, Kyiv region, Ukraine
² Institute of Mathematical Machines and Systems Problems, National Academy of Sciences of Ukraine, Kyiv, Ukraine

^*Corresponding author. E-mail address: kosts2@ukr.net

Abstract: The paper presents a brief description of the Nuclear Safety Monitoring System (NSMS), which is a part of the Integrated Automated Monitoring System of the "Shelter" object (a facility that covers the destroyed Unit No. 4 of the Chornobyl NPP). Further development of the NSMS is proposed by introducing algorithms for automatic identification of neutron anomalies with a help of fuzzy logic and statistical methods; digital filtering of specific irregular impulse interferences leading to metrological system failures; algorithms for predicting changes in neutron flux density and assessing changes in the nuclear hazard of fuel containing materials accumulations.

Keywords: Keywords: Chornobyl NPP, nuclear safety, monitoring systems, fuel-containing materials, algorithm for neutron anomalies.

1. Ye.M. Pazuhin. Lava-like fuel-containing masses of the 4th unit of the Chornobyl NPP: topography, physical and chemical properties, formation scenario, environmental impact. Thesis for the degree of Doctor in Physics and Mathematics (Chornobyl, 1999) 293 p. (Rus)

2. Analysis of the Shelter’s Current Safety and Predictive Assessments of the Situation Development. Intersectoral Scientific and Technical Center "Shelter" Technical report, made under agreement No. 3, on topic No. 4 of the general agreement No. 1/95 between the ChNPP and ISTC "Shelter". Responsible executor A. Borovoy (Chornobyl, 1996) 272 p. (Rus)

3. S.T. Beliaev et al. Technical Substantiation of the Nuclear Safety of the "Shelter". I. V. Kurchatov Institute of Atomic Energy Technical report (Moskva, 1990) 160 p. (Rus)

4. N. Molitor, Z. Drace, C. Javelle. Achievements and Remaining Challenges for the Conversion of Chornobyl NPP Unit 4 into Ecologically Safe Conditions. In: 30 Years of Chernobyl Catastrophe (Kyiv: International Chernobyl Centre, 2016) p. 140. (Rus)

5. R.L. Godun et al. Statistical analysis of neutron activity, registered by nuclear safety monitoring system (NSMS IAMS) NSC-OS. In: Third International Conference on Nuclear Decommissioning and Environment Recovery. INUDECO’18. Conf. Proc., Slavutych, Ukraine 25 - 27 April 2018 (Chernihiv, Chernihiv National Technological University, 2018) p. 87. https://inudeco.pro/wp-content/uploads/2021/03/2018.pdf

6. Shelter Implementation Plan. Chernobyl Unit 4. TACIS Services DG IA, European Commission (Brussels, 1997).

7. On Developing an Integrated Automated Monitoring System of the Shelter. Technical decision No. 3/01-OS, 2001. (Rus)

8. IAMS-OVER-ZS-1103-E. Technical Design. Explanatory Note, 2005.

9. Determination of New Informative Locations for Detecting Units. Well verification. Intersectoral Scientific and Technical Center "Shelter" Technical report. (Chornobyl, 2001) 131 p.

10. NUTECO-03-DBP-001. IAMS. Design Bases.

11. Ye.D. Vysotskyi, M.V. Saveliev. Analysis of some anomalies in the NSMS NFD readings of the Shelter Object. In: Second International Conference on Nuclear Decommissioning and Environment Recovery (INUDECO’17). Conf. Proc., Slavutych, Ukraine 25 - 27 April 2017 (Chernihiv, Chernihiv National Technological University, 2017) p. 24. (Rus) https://inudeco.pro/wp-content/uploads/2021/03/2017.pdf

12. V.A. Babenko, V.N. Pavlovych. Study of the properties of a self-sustaining nuclear chain reaction in the fuel-containing masses of the "Ukryttya" object in the case of varying velocity of water inflow. Yaderna Fizyka ta Energetyka (Nucl. Phys. At. Energy) 19(1) (2018) 21. (Rus) https://doi.org/10.15407/jnpae2018.01.021

13. Ye.D. Vysotsky. Nuclear danger of the "Shelter" object. In: First International Conference on Nuclear Decommissioning and Environment Recovery (INUDECO’16). Conf. Proc., Slavutych, Ukraine 25 - 27 April 2016 (Slavutych, 2016) p. 82. (Rus) https://inudeco.pro/wp-content/uploads/2021/03/2016.pdf

14. R.L. Godun. The study of the cluster of fuel-containing materials under room No. 305/2 of "Shelter" object. In: 23rd International Quench Workshop, Karlsruhe, Germany, 17 - 19 October 2017 (Karlsruhe: Institute of Technology, 2017). https://publikationen.bibliothek.kit.edu/1000076201

15. Ye.D. Vysotsky, R.L. Godun, A.O. Doroshenko. The dynamics of neutron activity and subcriticality of a nuclear-dangerous cluster under conditions of the NSC-OS complex. Problemy Bezpeky Atomnykh Electrostantsiy i Chornobylya (Problems of Nuclear Power Plants’ Safety and of Chornobyl) 30 (2018) 78. (Rus) https://doi.org/10.31717/1813-3584.18.30.9

16. V.O. Krasnov, R.L. Godun. The state of fuel-containing materials inside the NSC "Arka" and problems which connected with the ensuring of their nuclear and radiation safety. Problemy Bezpeky Atomnykh Electrostantsiy i Chornobylya (Problems of Nuclear Power Plants’ Safety and of Chornobyl) 32 (2019) 22. (Ukr) https://doi.org/10.31717/1813-3584.19.32.3

17. S.A. Smoliak, B.P. Tytarenko. Sustainable Methods of Assessment. Statistical Processing of Non-Homogeneous Complexes (Moskva: Statistika, 1980) 208 p. (Rus) Book

18. Ya.S. Brodskyi, N.N. Bytsan, V.M. Vlasenko. On the elimination of extreme values. Zavodskaya Laboratoriya 7 (1975) 847. (Rus)

19. A.C. Kimber. Tests for many outliers in an exponential sample. Royal Statistical Society 31(3) (1982) 263. https://doi.org/10.2307/2348000

20. L.A. Zadeh. Fuzzy Sets. Information and Control 8 (1965) 338. https://www-liphy.univ-grenoble-alpes.fr/pagesperso/bahram/biblio/Zadeh_FuzzySetTheory_1965.pdf

21. Yu.P. Kondratenko, Ye.V. Sidenko. Features of synthesis and modeling of hierarchically organized decision support systems based on fuzzy logic. Visnyk of Kherson National Technical University 2(41) (2011) 150. (Ukr) Article

22. R.P. Feynman, F. de Hoffmann, R. Serber. Dispersion of the neutron emission in U-235 fission. J. Nucl. Energy 3(1-2) (1956) 64. https://doi.org/10.1016/0891-3919(56)90042-0

23. O.A. Kuchmahra et al. Analysis of experimental statistics of intervals. Equivalence of intervals statistics and of count statistics. Problemy Bezpeky Atomnykh Electrostantsiy i Chornobylya (Problems of Nuclear Power Plants’ Safety and of Chornobyl) 28 (2017) 93. (Ukr) http://www.ispnpp.kiev.ua/wp-content/uploads/2017/2017_28/c93.pdf

24. D. Belsley et al. Regression Diagnostics: Identifying Influential Data and Sources of Collinearity (Wiley Series in Probability and Mathematical Statistics). 1st ed. (New York, 1980) 310 p. Google books