Certain problems of radiation safety at nuclear power plants based on WWER-440 reactors

The studies of radiation safety at serial atomic power stations with WWER-440 have shown that the level of penetrating radiations does not exceed the permissible values; personnel irradiation is on the average not higher than 5% MPD annually. The slight blow-out of radioactive gases (3-30 Ku/day) and iodine (>10-4 Ku/day) is indicative of low content of fission products in the water coolant and of rather high pressurization of production equipment. With such a low blow-out the content of radionuclides fixed in air, water reservoirs, soil, plants, and of radioiodine in milk has been not higher than that of the background. External irradiation of the population can reach, by estimates, the level of not higher than 1-2% of the background