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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V. I. Borysenko¹, O. P. Volokh², V. V. Goranchuk¹, M. M. Sydoruk<sup>1,2

1</sup>Institute for Safety Problems of Nuclear Power Plants, National Academy of Sciences of Ukraine, Kyiv, Ukraine
²Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract: In this article the subcriticality determination of nuclear reactor is considered. Emphasized that, despite the requirements of regulatory documents on the subcriticality determination of VVER from the beginning of their operation, so far, this problem has not been solved. The results of subcriticality determination of Rossi-α method of the WWR-M is presented. The possibility of subcriticality determination of VVER is considered. The possibility of subcriticality determination of Rossi-α method with time resolution is of about 100 microseconds is also considered. The possible reasons for the error in subcriticality determination of the reactor are indicated.

Keywords: subcriticality, reactivity, statistical methods, Rossi-α method, research reactor, power nuclear reactor.

1. Nuclear safety terms of nuclear power plants reactors with VVER pressurized by water. NP (306.2.145-2008) (Ukr).

2. Nuclear safety terms of nuclear power plants. PBYA RU AC-89. PNAE G-1-024-90 (Rus).

3. Nuclear safety terms of nuclear power plants. PBYA04-74. Gosatomnadzor (1974) (Rus).

4. The program "On measures implementation on safety improving and modernization of power unit No. 2 of Khmelnitsky NPP". NAEK “Energoatom”, 2004 (Rus).

5. IAEA Technical Report. IAEA-EBR-WWER-05. (March 1996) (Rus).

6. Calculation methods of neutron-physical characteristics on physical experiments at NPPs with VVER1000 reactors. РДЭО 0151-2004. ОАО “Kontsern Rosenergoatom” (2005) (Rus).

7. Ponomarenko G. L. New conceptual approach to minimum sufficient control rods in reactors determination (МNTK-2011) (Rus).

8. Kudryavtsev K. G., Kalyazin N. N., Bolotov D. V. et al. Sb. Dokl. Simpoziuma XVII Festivalya "Dysnai 2004", Litva (Rus).

9. Integrated method of physical and dynamic characteristics of the RBMK-1000 determining. RDEO 1.1.2.09.0137-2009. ОАО “Kontsern Rosenergoatom” (Rus).

10. Kipin Dzh. R. Physical Basis of Nuclear Reactors Kinetics (Moscow: Atomizdat, 1967) 428 p. (Rus).

11. Urig R. Statistical Methods in Nuclear Reactors Physics (Moscow: Atomizdat, 1974) 400 p. (Rus).

12. Feyman R. P. Ctatistical Behavior of Neutron Chains. LA-591 (DEL) (Los Alamos Scientific Laboratory, 1946).

13. Orndoff J. D. Prompt Neutron Periods of Metal Critical Assemblies. Nucl. Sci. Eng. 2 (1957) 450. https://doi.org/10.13182/NSE57-A25409

14. Kuramoto R., Adimir dos Santos, Jeres R. et al. Rossi-α Experiment in the IPEN/MB01 Research Reactor. Brazilian J. of Phys. 35(3B) (2005) 751.

15. Czibok T., Dezso Z., Horvath Cs. et al. A modernized and versatile startup reactivity measuring system installed at NPP Paks and its application for subcritical systems. Nucl. Eng. and Design 236 (2006) 2356. https://doi.org/10.1016/j.nucengdes.2006.01.012

16. Doulin V. A., Spriggs G. D. On the Rossi-α Measurements of β_eff in Reflected Reactors. Atomnaja Energiya 82 (1997) 66.

17. Hansen G.E. The Rossi-α Method. Workshop on Subcritical Reactivity Measurements. (University of New Mexico, August 25 - 29, 1985).