Radiation monitoring of drinking water in the vicinity of the Beloyarsk NPP

The article provides a radiation-hygienic assessment of the current state of drinking water supply sources for the population in the observation area of the the Beloyarsk NPP and the Institute of Nuclear Materials. We determined the content of natural (²³⁴U, ²³⁸U, ²²⁶Ra, ²²⁸Ra, ²¹⁰Po, ²²²Rn, ²¹⁰Pb, ²²⁸Th, ²³⁰Th, ²³²Th) and technogenic (³H, ¹⁴C, ⁶⁰Co, ⁹⁰Sr, ¹³⁴Cs, ¹³⁷Cs, ²³⁸Pu, ^239,240Pu, ²⁴¹Am) radionuclides in drinking water of tap water, water boreholes and water wells in test settlements located at different distances and directions from radiation hazardous facilities. Results of monitoring of water sources in 2012–2013 and 2019 showed the radiation safety of drinking water in the vicinity of the Beloyarsk NPP according to several criteria. Thus, the maximum levels of the gross specific alpha-activity of radionuclides in water samples were 3.9 times lower than the control level (0.2 Bq/kg), the gross specific beta-activity was 5.7 times lower than the control level (1 Bq/ kg). Over the entire observation period, none of the drinking water samples exceeded the control levels both for individual radionuclides and for the sum of the ratios of specific activities to control levels. The content of natural and artificial radionuclides in drinking water near the Beloyarsk NPP decreases in the following order: water wells > water boreholes > tap water. For the past 20 years, there was a decrease in tritium specific activity in drinking water of the Beloyarsk NPP region by 20–35%, depending on the source of water supply. It was noted that the launch of the BN-800 reactor also did not lead to an increase in the content of other artificial radionuclides (⁹⁰Sr, ¹³⁷Cs) in groundwater. The average annual effective dose of internal exposure of the population due to drinking water consumption in the vicinity of the Beloyarsk NPP is 0.05 mSv, according to conservative estimates – 0.07 mSv, which is below the radiation safety threshold (0.1 mSv/a) recommended by the WHO. Natural radionuclides play the primary role in the formation of the annual average effective dose for internal irradiation (98.9%) due to drinking water consumption on the considered territories. ²¹⁰Po makes the largest contribution to the dose from natural radioisotopes – 43%, somewhat less is made by ²¹⁰Pb – 25%. The third place in the dose formation from natural radionuclides belongs to ²³⁴U (8%), ²²⁸Ra (7%), ²²⁶Ra (6%) and ²³⁰Th (6%). The contribution of other natural radioisotopes in the formation of the internal radiation dose from drinking water consumption does not exceed 2-3%. The contribution of technogenic radionuclides to the annual average effective dose from the consumption of drinking water is negligible (about 1%). Of the technogenic components, ⁹⁰Sr (60%), ³H (20%), and ²⁴¹Am (12%) play the most significant role in the formation of the internal exposure dose.

1. World Health Organization. Guidelines for Drinking-water Quality – 4th ed. ISBN 978 92 4 154815 1. Geneva; 2011. 541 p.

2. Ovsyannikova TM. The radioactive monitoring of drinking water: guidelines and methods of measuring of gross alpha and beta activities (worldwide practice and trends). ANRI = ANRI. 2011;2(65): 2-15 (In Russian)

3. Romanovich IK, Kaduka MV, Goncharova YuN, Shvydko NS, Shutov VN. On the substantiation of initial screening gross alpha activity concentration level for drinking water safety assessment establishment. Radiatsionnaya Gygiena = Radiation Hygiene. 2009;2(3): 11-14 (In Russian)

4. Stamat IP, Romanovich IK, Gorsky GA. Justification to the introduction of regulation for radionuclide content in the drinking water according to adult population. Radiatsionnaya Gygiena = Radiation Hygiene. 2009;2(3): 20-25 (In Russian)

5. Harmful chemicals: a handbook. Ed. by Filov VA. SaintPetersburg: Chemistry; 1994. 686 p. (In Russian)

6. Stamat IP, Stupina VV. On standardization of radiation protection indexes of natural mineral waters. Radiatsionnaya Gygiena = Radiation Hygiene. 2014;7(2): 30-36 (In Russian)

7. Saldan IP, Balandovich BA, Potseluev NYu. Hygienic evaluation of the specific activity of natural radionuclides in water of potable water supply. Zdorovye naseleniya i sreda obitaniya = Public Health and Life Environment. 2015;10(271): 29-34 (In Russian)

8. United Nations, Sources and Effects of Ionizing Radiation (Report to the General Assembly with Scientific Annexes). Volume 1 Sources. Annex B, Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), UN, New York; 2000. P. 84-156.

9. Goncharova YuN, Basalaeva LN, Kaduka MV, Shvydko NS, Kaduka AN. Estimation of the population exposure doses from natural and artificial radionuclides due to drinking-water consumption for the inhabitants of different areas of Russian Federation. Radiatsionnaya Gygiena = Radiation Hygiene. 2010;3(2): 39-44 (In Russian)

10. Sapozhnikov YuA, Aliev RA, Kalmykov SN. Environmental radioactivity. Moscow, BINOM. Laboratory of knowledge; 2006. 286 p. (In Russian)

11. Kaduka MV, Basalaeva LN, Bekyasheva TA, Ivanov SA, Salazkina NV, Stupina VV, et al. Content of uranium isotopes in the groundwater supplies used for population of Leningrad region and St-Petersburg. Radiatsionnaya gygiena = Radiation Hygiene. 2018;11(3): 74-82. (In Russian) DOI: 10.21514/1998-426Х-2018-11-3-74-82.

12. Chebotina MY, Nikolin OA, Bondareva LG, Rakitsky VN. Tritium in urine of people living in the area of influence of the Beloyarskaya NPP. Radiatsionnaya Gygiena = Radiation Hygiene. 2016;9(4): 87-92. (In Russian) https://doi.org/10.21514/1998-426X-2016-9-4-87-92.

13. Semenischev VS, Voronina AV, Nikiforov AF. Determination of Radon-222 in natural drinking water sources in outskirts of Ekaterinburg. Vodnoye khozyaystvo Rossii: problemy, tekhnologii, upravleniye = Water Sector of Russia: Problems, Technologies, Management. 2014;4: 95-101 (In Russian)

14. Chebotina MY, Nikolin OA. Radioecological studies of tritium in the Ural region. Ekaterinburg: UB RAS; 2005. 91 p.

15. Chebotina MYa. Tritium inflow from the cooling pond to the sources of drinking water supply by filtration through the deep layers of the underlying rocks. Doklady akademii nauk = Academy of Sciences Reports. 2011;438(5): 675-677 (In Russian)

16. Panov AV, Trapeznikov AV, Isamov NN, Korzhavin AV, Kuznetsov VK, Geshel IV. Assessment of the impact of the BN-800 reactor operation on the radionuclides content in local foodstuffs in the vicinity of Beloyarsk NPP. Radiatsionnaya Gygiena = Radiation Hygiene. 2020;13(3): 38-50. (In Russian). DOI: 10.21514/1998-426X-2020-13-3-38-50.

17. Goncharova YuN, Shvydko NS, Kaduka AN. Investigation of season and long-term variations of natural radionuclides specific activity in underground water. Radiatsionnaya Gygiena = Radiation Hygiene. 2013;6(1): 17-23. (In Russian)

18. Kaduka MV, Shvydko NS, Shutov VN, Basalaeva LN, Goncharova YuN, Salazkina NV, et al. Estimation of the population exposure doses from drinking-water consumption for the inhabitants of north-eastern area of Russia. Radiatsionnaya Gygiena = Radiation Hygiene. 2010;3(1): 23-27 (In Russian)

19. Momot OA, Silin II, Synzynys BI, Kozmin GV. Assessment of radiation risk for public health in the presence of tritium in drinking water. Hazard identification. Izvestiya vysshikh uchebnykh zavedeniy. Yadernaya energetika = Nuclear Energy and Technology. 2007;2: 84-91 (In Russian)

20. Benedik L, Jeran Z. Radiological of natural and mineral drinking waters in Slovenia. Radiation Protection Dosimetry. 2012;151(2): 306-313.

21. Vesterbacka P. 238U-series radionuclides in Finnish groundwater-based drinking water and effective doses. Academic Dissertation. Radiation and Nuclear Safety Authority, STUK. University of Helsinki, Faculty of Science. Department of Chemistry, Laboratory of Radiochemistry; 2005. 94 p.

22. Pivovarova EA, Pivovarov AA. The Radiological Hygienic Assessment of the Sources of Utility and Drinking Water Supply for the Population of Khakasia Republic. Radiatsionnaya Gygiena = Radiation Hygiene. 2016;9(3): 61-68. (In Russian) https://doi.org/10.21514/1998-426X-2016-9-3-61-68.