Radionuclide composition of emissions from a low-power floating nuclear power plant with a water-cooled reactor installation

For the first time, experimental studies of the intensity and radionuclide composition of gas-aerosol emissions from a small modular marine reactor have been performed. Eleven radionuclides have been identified in the investigated sources of radioactive emissions. Atmospheric emissions of the identified radionuclides create an irradiation of the Pevek population of less than 0.03 μSv/year, which is many times lower than the dose quota for radiation from the release of radioactive substances into the atmosphere established for the NPP, equal to 50 μSv/year. The main radionuclides that form at least 95% of the annual effective dose of the population of Pevek from the floating nuclear power plant emissions during normal operation have been identified: 3H, 14C, 41Ar. In the first years of operation of the floating NPP, the specific emission was 2.72·10-1 GBq/GW·h, 2.91·10-3 GBq/GW·h, 1.53·10-2 GBq/GW·h, respectively, for 3H, 14C, 41Ar. The obtained values ​​of specific emission can be taken as the baseline for assessing compliance with the principles of the INPRO methodology for all subsequent projects of marine small modular reactors.