Nuclear Physics and Atomic Energy

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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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Nucl. Phys. At. Energy 2025, volume 26, issue 1, pages 69-74.
Section: Atomic Energy.
Received: 03.12.2024; Accepted: 24.02.2025; Published online: 29.03.2025.
PDF Full text (ua)
https://doi.org/10.15407/jnpae2025.01.069

Dosimetric experiment at the VVER-1000 reactor of Rivne NPP unit No. 3

Î. M. Pugach*, V. L. Diemokhin, V. N. Bukanov, O. V. Grytsenko, V. V. Ilkovych

Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

*Corresponding author. E-mail address: o.m.pugach@gmail.com

Abstract: A detailed description of the dosimetric experiment to determine the characteristics of the neutron field at the locations of surveillance specimens at Rivne NPP Unit No. 3 is presented. Through the complex analysis of the experimental data, the presence of general regularities in the behavior of neutron spectrum characteristics, such as the spectral index, at these locations was identified. A comparison of the calculated and experimental data was carried out, demonstrating that the MCSS code package is suitable for determining the irradiation conditions of surveillance specimens, particularly when developing an upgraded program.

Keywords: VVER-1000, surveillance specimens, upgraded program, dosimetric experiment, neutron transport calculation, neutron-activation method.

References:

1. Surveillance specimens. Technical description and operating instructions. 1152.75.00.00.000 TO. 60 p. (Rus)

2. Standard Program for monitoring the metal properties of VVER-1000 reactor pressure vessels using surveillance specimens PM-T.0.03.120-23 (SE "NNEGC "Energoatom"", 2023) 39 p. (Ukr)

3. A.V. Gritsenko et al. Some stages of development of additional surveillance specimens program for VVER-1000 reactor. Nuclear and Radiation Safety 2(50) (2011) 29. (Rus) https://doi.org/10.32918/nrs.2011.2(50).06

4. Working program for monitoring the properties of the metal of the reactor pressure vessel of unit No. 3 of Rivne NPP with the application of modernization of 4-6 OS sets. Inventory No. 180-16/158 (Moskva: NRC "Kurchatov Institute", 2008). (Rus)

5. V.N. Bukhanov et al. Problems of dosimetry of surveillance specimens irradiated in the VVER-1000 reactor. Nuclear and Radiation Safety 2 (2000) 35. (Rus)

6. Standard of organization of Ukraine (SOU) 73.1-23724640-002-2022. Quality system. Dosimetry of surveillance specimens of the VVER-1000 reactor vessel metal (Kyiv, Institute for Nuclear Research, National Academy of Sciences of Ukraine, 2022) 47 p. (Ukr)

7. A.V. Gritsenko. Determination of neutron flux functionals on surveillance specimens of VVER-1000 reactor vessel metal. PhD Dissertation in technical sciences (Kyiv, 2003) 170 p. (Rus)

8. V.N. Bukanov et al. Comparison of irradiation conditions of VVER-1000 reactor pressure vessel and surveillance specimens for various core loadings. In: Reactor Dosimetry State of the Art 2008. Proc. of the 13th Intern. Symp. on Reactor Dosimetry, Akersloot, The Netherlands, 25 - 30 May 2008 (World Scientific, 2009) p. 318. https://doi.org/10.1142/7240

9. V.L. Diemokhin, V.V. Ilkovich, V.N. Bukanov. Evaluation of neutron flux scatter on surveillance specimens of VVER-1000 reactor vessel metal in the additional program. Nuclear and Radiation Safety 2(54) (2012) 21. (Rus) https://doi.org/10.32918/nrs.2012.2(54).05

10. MCSS software package: Verification report. Institute for Nuclear Research, National Academy of Sciences of Ukraine. Inventory No. 340/38 89 (Kyiv, 2012) 22 p. (Rus)

11. V.V. Ilkovych. Development of scientific and technical foundations for the additional program of monitoring the VVER-1000 reactor vessel metal using surveillance specimens. PhD Dissertation in technical sciences (Kyiv, 2015) 156 p. (Rus)

12. V.L. Diemokhin, V.V. Ilkovych, V.N. Bukanov. Verification and validation: process vs procedure. Nucl. Phys. At. Energy 14(2) (2013) 150. (Rus) https://jnpae.kinr.kyiv.ua/14.2/html/jnpae-2013-14-150-Diemokhin.html

13. Regulatory Guide 1.190. Calculational and dosimetry methods for determining pressure vessel neutron fluence (US Nuclear Research Commission, 2001) 53 p. https://www.nrc.gov/docs/ML0108/ML010890301.pdf

14. Î.M. Pugach et al. Uncertainty determination of fast neutron fluence onto the WWER pressure vessel metal surveillance specimens. Nucl. Phys. At. Energy 22(1) (2021) 42. (Ukr) https://doi.org/10.15407/jnpae2021.01.042

15. V.L. Demekhin, V.N. Bukanov, E.G. Vasilieva. Effective cross-sections calculated from the neutron spectrum at the outer surface of the VVER-1000 reactor vessel. Scientific papers of the Institute for Nuclear Research (Kyiv, 1999) p. 164. (Rus)

16. V.L. Dyemokhin et al. Researches of spatial dependence of fast neutron spectrum form at the outer surface of WWER 1000 pressure vessel. Nucl. Phys. At. Energy 2 (15) (2005) 90. (Rus) https://jnpae.kinr.kyiv.ua/06.2/Articles_PDF/jnpae-2005-06-2-090.pdf