Fuel Particles in Consequences of the Accident at the ChNPP

A. P. Ermilov

Science and Technology Center “Amplituda” Ltd.,
Zelenograd 124460, Moscow Region, Russian Federation

DOI: doi.org/10.31717/2311-8253.21.1.1

Abstract

As a result of the nuclear explosion at the fourth block of the Chornobyl NPP (ChNPP), the radioactive cloud containing an aerodispersed system with aerosols formed at the explosion appeared in air above the ChNPP territory. The accident occurred at the end of the reactor company before the assumed reloading of the active zone. Thus, the cloud composition included the products of fission and activation of uranium that were accumulated in the reactor fuel during the company. On that night, the east wind carried the radioactive cloud to the west, by leaving the aerosol fallouts on Earth’s surface as a radioactive trace. The results of the own studies (1986–1990) of aerosol fallouts on the west trace formed at once after the explosion at the ChNPP are presented. On this basis, the characteristics [physico-chemical forms, radionuclidic composition, activity median aerodynamic diameters (AMADs), etc.] of the aerodispersed system created at once after the explosion of the active zone of the reactor are reconstructed. In the frame
of the respiratory model given in ICRP Publication 66, the contributions caused by the inhalation of fuel particles (microscopic particles which are fragments of exploded fuel elements and have conserved mainly their radionuclidic characteristics) to the doses of irradiation of parts of respiratory organs and gastrointestinal tract (GIT) are evaluated. It is shown that the cause for a mass cough in the summers of 1986 and 1987 on territories underwent the action of emergency fallouts was the inhalation of radionuclides of ruthenium in the form of RuO₄ that was formed in “hot” particles contacting with air and then evaporated from them. The “hot” particles are compact inclusions formed by fission products. They consist mainly of atoms close to noble metals (molybdenum, ruthenium, rhodium, etc.) formed during a regular operating period in fuel tablets and released from the latter at the explosion of the active zone. The reasons for the disagreement between the clinic consequences and the ascribed values of the dose for the sufferers who were present in premises of the NPP at the emergency time and then died from acute radiation sickness in three-four weeks after the accident are explained.

Keywords: Chornobyl NPP, accident, nuclear fuel, fuel particles, “hot” particles, “volatile” fraction, acute radiation sickness.

References

1. Ermilov A. P. (2016). The phenomenon of fuel particles in consequences of the accident at ChNPP. Appar. Nov. Radiats. Izmer., vol. 84, no. 1, pp. 15–33. (in Russ.)

2. Ermilov A. P. (2016). The Phenomenon of fuel particles in consequences of the accident at ChNPP. Part 2. Appar. Nov. Radiats. Izmer., vol. 85, no. 3, pp. 22–30. (in Russ.)

3. Ermilov A. P., Molokanov A. A. (2017). The phenomenon of fuel particles in consequences of the accident at ChNPP. Part 3. Appar. Nov. Radiats. Izmer., vol. 88, no.1, pp. 62–65. (in Russ.)

4. Kut’kov V. N. (1998). Radionuclidic Contamination of Air as a Result of the Accident at the Chernobyl NPP and Irradiation of Lungs. In: Chuchalin A. G., Chernyaev A. L., Voisin C. Pathology of Respiratory Organs in Liquidators of the Accident at the Chernobyl NPP. Moscow: GRANT; 272 p. (in Russ.) pp. 10–43.

5. Ermilov A. P., Ziborov A. M. (1997). Radionuclidic characteristics of the fuel component of Chernobyl radioactive fallouts. Radiats. Risk, vol. 9, pp. 95–106. (in Russ.)

6. Dement’ev S. I. (1990). Kinetics of Exchange of radioactive products in persons suffered from the accident at the Chernobyl NPP. PhD Thesis (Med. Sci.), Appendix. Moscow. (in Russ.)

7. Ermilov A. P., Ziborov A. M. (1993). Radionuclidic ratios in the fuel component of radioactive fallouts in the near zone of ChNPP. Radiats. Risk, vol. 3, pp. 134–138. (in Russ.)

8. Ermilov A. P., Ziborov A. M. (1997). Evaluation of the fuel and condensation components of “nonvolatile” radionuclides in fallouts at the far distances from the Chernobyl NPP. Radiats. Risk, vol. 9, pp. 90–94. (in Russ.)

9. Ermilov A. P., Ziborov A. M. (1997). The physical substantiation of a universal model of radioactive fallouts as a result of the accident at the Chernobyl NPP. Radiats. Risk, vol. 10, pp. 151–159. (in Russ.)

10. Ermilov A. P., Yaryna V. P. (1989). The radiometric estimate of the density of fallouts of alpha-emitting radionuclides on land. Izmer. Tekhn., vol. 3, p. 57. (in Russ.)

11. Vinogradov V. A., Ermilov A. P., Petrov S. V., Prokhorenko O. D., Tikhomirov D. D., Yaryna V. P. (1989). Application of the sedimentation method of determination of the fallout density for transuranium elements near the Chernobyl NPP. Izmer. Tekhn., vol. 3, pp. 57–58. (in Russ.)

12. ICRP: Database of dose coefficients: workers and members of the public. Available at: http: //www.icrp.org/ publication.asp?id = ICRP CD1.

13. Vlasenko A. N., Legeza V. I., Matveev S. Yu., Sosyukin A. E. (2008). Clinic Radiology. Moscow: GEOTAR-Media, 224 p. (in Russ.)

14. Keirim-Markus I. B. (ed.) (2007). Basic anatomic and physiological data for the usage in radiation safety. ICRP Publication 89. Moscow: Medkniga, 318 p. (in Russ.)

15. Ham A. W., Cormack D. H. (1979). Histology. Philadelphia: Lippincott.

16. IAEA Safety Standards. Criteria for Use in Preparedness and Response for a Nuclear or Radiological Emergency. No. GSG-2. Vienna: IAEA, 2011.

17. Chemical Encyclopedia. Moscow: Bol’sh. Ross. Entsikl. 1998. (in Russ.)

18. Interim Report of Fallout Situation in Finland from 5 to 16 May 1986. Helsinki: Finnish Centre for Radiation and Nuclear Safety, 1986.

19. Izrael’ Yu. A., Petrov V. N., Avdyushin S. I., Gasilina P. K., Rovinskii F. Ya., Vetrov V. Ya., Vakulovskii S. M. (1987). Radioactive Contamination of the Natural Media in the ChNPP Accident Zone. Meteor. Gidrolog., vol. 2: pp. 11–80. (in Russ.)

20. Falk R., Suomela I., Andor Kerekes (1989). A study of “hot particles” collected in sweden one year after the Chernobyl accident. Proceedings of the 1988 European Aerosol Conference, 30 August – 2 September 1988. Oxford: Pergamon Press, pp. 1339–1342.

21. Devell L., Tovedal H., Bergstrom U., Appelgren A., Chyssler J., Andersson L. (1986). Initial observations of fallout from the reactor accident at Chernobyl. Nature, vol. 324, pp. 192–193.

22. Bogatov S. A., Borovoi A. A. (1991). On some properties of fuel-containing particles formed in the accident at ChNPP and peculiarities of the formation of the fuel ejection. Moscow: IAE. (in Russ.)

23. Begichev S. N., Borovoi A. A., Burlakov E. V., Gavrilov S. L., Dovbenko A. A., Levina A. A., Markushev V. M., Marchenko A. E., Stroganov A. A., Tataurov A. L. (1990). Fuel of the Reactor of the 4th Unit of ChNPP (Short Handbook). Moscow: IAE. (in Russ.)

24. Gorbachev V. M., Zamyatnin Yu. S., Lbov A. A. (1976). Interaction of emissions with the nuclei of heavy elements and fission of nuclei. Moscow: Atomizdat. (in Russ.)

25. Radiation Safety Norms NRB-76/87 and Basic Sanitary Rules of the Operation with Radioactive Substances and Other Sources of Ionizing Emissions. OSP-72/87/Ministry of Health of the USSR. Moscow: Energoatomizdat, 1988. (in Russ.)

26. Gus’kova A. K., Galstyan I. A., Gusev I. A. (2011). The Accident at the Chernobyl Nuclear Power Plant (1986 – 2011): Consequences for Health, Reflections of a Doctor. Moscow: I. A. Burnazyan Federal Medical Biophysical Center, 253 p. (in Russ.)

27. Radiation Protection ICRP PUBLICATION66. Human Respiratory Tract Model for Radiological Protection. New York: Pergamon Press, 1993.

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