# New Safe Confinement and Radioactive Aerosols in Short-Range Region of Chornobyl Nuclear Power Plant

V. K. Shynkarenko, V. A. Kashpur, G. G. Skorjak, A. A. Svirid

Institute for Safety Problems of Nuclear Power Plants, NAS of Ukraine, Lysogirska str., 12, Kyiv, 03028, Ukraine

DOI: doi.org/10.31717/2311-8253.19.1.9

### Abstract

The construction of a new safe confinement (NSC) is one of the main stages in transforming the 4th power unit of the Chernobyl Nuclear Power Plant into an environmentally safe system designed to ensure safety of personnel, public and environment. Additionally to the task of isolating the 4th power unit from the environment, the construction of the NSC should enable safe work with residues of the 4th unit, while the project allows quite high levels of volumetric activity of radioactive aerosols inside the NSC – up to 210 Bq/m3 in total beta activity. The purpose of this work is to study the dynamics of the aerosol situation in the near zone of the Chernobyl NPP under the influence of the NSC during 2017.

The sampling of the aerosol was carried out by filtering air through filters from Petryanov tissue, the exposure time was 7 days.

The data on the contamination by radioactive aerosols of the atmosphere surface layer in the near zone of the Chernobyl NPP after constructing the Arch of the new safe confinement are represented. Despite the relatively high air activity there the roof of the NSC, caused by work made under, the decrease of the surface air layer pollution on the adjacent territory comparable not only to the pollution level during the Arch construction, but also comparable to the levelbefore the start of constructing, is observed. There are statistically significant correlations between the 137Cs volume activities in the air near samplers located outside the NSC observed, while there are no significant correlations between the volume activities inside and outside the NSC. This indicates the absence of a significant effect of the radioactive aerosol release from the “Arch” object on the volume activity of the aerosol at other observation points.

On air filters exposed under the NSC Arch, a decrease in the proportion of large hot particles is observed, that could be explained by the peculiarities of local sampler positioning.

Keywords: Shelter object, new safe confinement, volumetric air activity, hot particles, autoradiography.

### References

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Published
2019-05-31

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