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 60-68.
Section: Atomic Energy.
Received: 21.10.2024; Accepted: 24.02.2025; Published online: 29.03.2025.
PDF Full text (ua)
https://doi.org/10.15407/jnpae2025.01.060

Assessment of the size of the Khmelnytskyi NPP observation zone taking into account power units No. 5 and 6 with the AP1000 reactor

Ì. Ì. Òalerko1,*, Ò. D. Lev1, À. V. Nosovskyi1, V. Ì. Rudko1, À. Ì. Novikov1, O. V. Blokhina2

1 Institute for Safety Problems of Nuclear Power Plants, National Academy of Sciences of Ukraine, Kyiv, Ukraine
2 Separate Division "Atomproektengineering" of SE NNEGC "Energoatom", Êyiv, Ukraine


*Corresponding author. E-mail address: ntalerko@gmail.com

Abstract: An assessment of the size of the observation zone (OZ) of the Khmelnytskyi NPP was carried out, taking into account the potential impact of power units No. 3 and 4 with the VVER-1000 reactor and No. 5 and 6 with the AP1000 reactor manufactured by the Westinghouse Electric Company. The calculations were carried out based on the requirements of the document NP 306.2.173-2011 "Requirements for determining the dimensions and boundaries of the observation zone of a nuclear power plant". When calculating the radiation doses to the population in the initial period of the radiation accident, contributions from the inhalation of radionuclides into the human body and external radiation from the cloud and fallout on the soil surface were taken into account. The size of the observation zone of the Khmelnytskyi NPP was determined based on not exceeding the criteria for the introduction of urgent countermeasures (lower limits of justification) in the event of a beyond-basis design accident at one of the power units. The determining factor for determining the OZ size is not exceeding the criterion for the effective radiation dose for the critical age group "1 year" in the event of an accident at power units with VVER-1000 reactors. The main way of forming an effective dose of radiation is external exposure from depositions on the ground. (93 % for 1-year-old children and 94 % for adults). The main part of the effective dose for the critical age group "1 year" is formed due to the contribution of 131-135I in aerosol and organic forms, which is almost 89 %. The share of long- and medium-lived radionuclides in the form of aerosols is about 7.3 %, of which 6.9 % is the contribution of cesium isotopes. The contribution of inert radioactive gases is about 4 %. The size of the observation zone of the Khmelnytskyi NPP, calculated on the condition that all six power units are put into operation, is obtained to be 13.600 m. A conclusion was made that re-establishment of the dimensions of the observation zone of the Khmelnytskyi NPP is not advisable after the commissioning of the new units No. 3 and 4 with VVER-1000 reactors and No. 5 and 6 units with AR1000 reactors.

Keywords: nuclear power plant, observation zone, AP1000 reactor, VVER-1000 reactor, beyond design basis accident, effective radiation dose.

References:

1. Law of Ukraine “On use of nuclear power and radiation safety” of 02/02/95, No. 39/95VR (1995). Bulletin of the Verkhovna Rada of Ukraine 12 (1995) art. 82. (Ukr) https://zakon.rada.gov.ua/laws/show/39/95-%D0%B2%D1%80#Text

2. NP 306.2.173-2011. Requirements for determining the dimensions and boundaries of the observation zone of a nuclear power plant (Approved by the order of the State Committee for Nuclear Regulation of Ukraine and the Ministry of Health of Ukraine dated on 11/07/2011 No. 153/766) 22 p. (Ukr) https://online.budstandart.com/ua/catalog/doc-page?id_doc=98757

3. ÄÑÏ 6.177-2005-09-02. Basic sanitary rules for radiation protection of Ukraine. State sanitary rules (ÎÑÏÓ 2005). (Ukr) https://online.budstandart.com/ua/catalog/doc-page.html?id_doc=48197

4. NP 306.2.141-2008. General safety regulations of nuclear power plants (Approved by the order of the State Committee for Nuclear Regulation of 11/19/2007 No. 162). (Ukr) https://online.budstandart.com/ua/catalog/doc-page.html?id_doc=98709

5. Radiation Safety Standards of Ukraine (NRBU-97). State hygiene standards DGN 6.6.1. - 6.5.061-2000. (Ukr) https://zakon.rada.gov.ua/rada/show/v0116488-00#Text

6. On approval the safety requirements for site selection for the placement of a nuclear power plant (Approved by the order of the State Committee for Nuclear Regulation of 04/07/ No. 68). (Ukr) https://zakon.rada.gov.ua/laws/show/z0467-08#Text

7. V.I. Bogorad et al. Justification of the size of the NPP observation zone. Nuclear & Radiation Safety 2(58) (2013) 39. (Rus) https://doi.org/10.32918/nrs.2013.2(58).09

8. K.V. Griban et al. State of the territory zoning problem around the NPP. Nuclear & Radiation Safety 1(65) (2015) 26. (Rus) https://doi.org/10.32918/nrs.2015.1(65).07

9. NP 306.2.141-2008. General safety regulations of nuclear power plants (Approved by the order of the State Committee for Nuclear Regulation of 11/19/2007 No. 162 as amended by the order of the State Nuclear Regulatory Inspectorate of 03/04/24 No. 195). (Ukr) https://zakon.rada.gov.ua/laws/show/z0598-24#n2

10. Standard of organization of Ukraine SOU NAEK 023:2014. Radiation safety. The procedure for the establishment of sizes of the NPP sanitary protective zone (Kyiv, SE "NNEGC "Energoatom"", 2014) 37 p. (Ukr)

11. Ì.Ì. Òalerko et al. Assessment of the size of the Khmelnytskyi NPP sanitary protection zone taking into account the construction of power units No. 5, 6 with the AP1000 reactor. Nuclear Power and the Environment. (2024, in press) (Ukr)

12. B.S. Prister et al. Safety Problems of Atomic Energy. Lessons from Chornobyl (Chornobyl: Institute for Safety Problems of NPPs, 2013) 200 p. (Rus) https://inis.iaea.org/records/9asfs-8s528

13. Actions to Protect the Public in an Emergency due to Severe Conditions at a Light Water Reactor. EPR-NPP Public Protective Actions (Vienna: IAEA, 2013) 133 p. https://www-pub.iaea.org/MTCD/Publications/PDF/EPR-NPP_PPA_web.pdf

14. Khmelnytskyi NPP. Power unit No. 2. Final Safety Analysis Report. Chapter 2. Characteristics of the NPP area and site (SE NNEGC “Energoatom”, PE "Khmelnytskyi NPP", 2023). (Ukr)

15. A.M. Kurganov. Tables of Parameters of the Maximum Intensity of Rain for Determining the Flow Rates in Drainage Systems (Moskva: Stroyizdat, 1984) 112 p. (Rus)

16. Khmelnitskyi NPP. Power unit No. 1. Safety Analysis Report. Chapter 5. Analysis of beyond design basis accidents. Part 2. Additional calculation justifications and development of final reports on analysis of beyond design basis accidents. Book 4. Recommendations for personnel emergency actions. The final list of beyond design basis accidents. 24.1.42.OB.03.02.04 (2 edn.) (SE NNEGC “Energoatom”, PE "Khmelnytskyi NPP", 2024) 215 p. (Ukr)

17. EA Questionnaire Response with AP1000 Overview and Plant Description. Attachment 4. Supporting Tables with detailed information for the EA Questionnaire (Westinghouse Electric Company LLC, 2022) 115 p.

18. L. Soffer et al. Accident Source Terms for Light-Water Nuclear Power Plants. Final report. NUREG-1465 (Washington, U.S. Nuclear Regulatory Commission, 1995) 38 p. https://www.nrc.gov/docs/ml0410/ml041040063.pdf

19. Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors. Regulatory Guide 1.183. Revision 1 (Washington, U.S. Nuclear Regulatory Commission, 2023) 87 p. https://www.nrc.gov/docs/ML2308/ML23082A305.pdf

20. AP1000 Design Control Document. Revision 19. Chapter 15. Accident Analyses. 15.6 Decrease in Reactor Coolant Inventory (Westinghouse Electric Company LLC, 2011) 263 p. https://www.nrc.gov/docs/ML1117/ML11171A373.pdf