Analysis of measurements results of environmental objects radioactivity in sanitary-protective zones and zones of observations of enterprises RTE "Atomflot" (Murmansk), "Nerpa" (Snezhnogorsk), "Zvyozdochka" and SMP (Severodvinsk) demonstrated that carried out radiation-dangerous works practically had no influence at radioactive contamination of soil, vegetation, sea water, seaweeds and bottom sediments.
Activity of soil, vegetation, sea water, seaweeds, atmospheric air and atmospheric falls is close to the levels, conditioned by natural radionuclides and global falls.
Local radioactive contamination of separate territory plots was registered at enterprises in separate years. These plots were decontaminated or the ground was removed and changed for a new one.
Gamma-radiation dose rate from the environmental objects on the enterprises' territory as well as outside does not exceed natural background limits change except limited plots in the region of direct works conducting. Irradiation component of indicated enterprises workers applied to separate persons from population is conditioned by external gamma-radiation and does not exceed 0.4 mSv/year.
However during execution of most radiation-dangerous works (transference of nuclear fuel, solid waste incineration, emergency NPP repairs and so on), aerosols activity in atmospheric air ground layer and atmospheric falls in sanitary-protective zone activity can significantly increase. Nevertheless air volumetric activity as a rule does not exceed 2 mBq/m3 inside the shops (out of examined zone) and 1 mBq/m3 on enterprises territory. Effective dose conditioned by inhalation route entry of atmospheric air radioactive aerosols will not exceed 0.08 mSv/year.
Thus total annual irradiation of separate persons from population the enterprises "Atomflot", "Nerpa", "Zvyozdochka" and SNIP territories maximum evaluation, conditioned by their activity, does not exceed 0.5 mSv that is about half of an annual dose dependent on natural sources (except radon).
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