Atmospheric Boundary Layer Monitoring with the SODAR/RASS System on the Belarusian NPP Site

Assessment of atmospheric dispersion stability based on the atmospheric boundary layer monitoring at the Belorussian nuclear power plant site

“…Stabil ity classes make it pos si ble to de ter mine the depend ence of the pa ram e ters of ver ti cal and hor i zon tal dis per sion of con tam i nants in the ABL, un der dif ferent weather con di tions, used in math e mat i cal mod els for cal cu lat ing the con cen tra tion fields of con tam inants. The ad van tage of the Pasquill-Vogt sta bil ity class sys tem over the Pasquill sta bil ity classes is that there is no need to use ad di tional data from me te o rolog i cal sta tions to de ter mine the at mo spheric sta bil ity classes and they can be de ter mined based on the data from the SODAR/RASS mea sur ing com plex, based on the wind speed at a height of 10 m and the ver ti cal gra di ent of the air tem per a ture in the lower 120-me ter of the ABL [5].…”

“…The ob ser va tion mon i tor ing sys tem, which includes the SODAR/RASS mea sur ing com plex and a data pro cess ing sub sys tem, car ries out au to matic record ing and ac cu mu la tion of the mea sure ment data. This sub sys tem pro vides for main tain ing a da ta base and cal cu lat ing a set of the ABL dis per sion char ac teris tics by means of the spe cially de vel oped soft ware [5].…”

“…There fore, at var i ous stages of the NPP life cy cle (con struc tion, op er a tion, and de com mis sion ing) a detailed study of the ABL at mo spheric dis per sion con ditions is car ried out at the NPP sites. In par tic u lar, it is en vis aged to de velop au to mated ra di a tion mon i tor ing sys tems and their main com po nents -ABL pa ram e ters mea sur ing sys tems [5]. Ac cord ing to [5,6], the key tasks of such mon i tor ing are: -to de ter mine the ABL dis per sion char ac ter is tics that are re quired for cal cu la tions of the po ten tial ra di a tion im pact on plant per son nel, the pub lic and the en vi ron ment in case of vi o la tions in normal NPP op er a tion, in clud ing ac ci dents, -to pre dict and timely de tect the trends in fluc tu ations of the ABL dis per sion char ac ter is tics over time, and -to de velop rec om men da tions aimed at mit i gat ing the ad verse im pact of NPP on the en vi ron ment.…”

“…In par tic u lar, it is en vis aged to de velop au to mated ra di a tion mon i tor ing sys tems and their main com po nents -ABL pa ram e ters mea sur ing sys tems [5]. Ac cord ing to [5,6], the key tasks of such mon i tor ing are: -to de ter mine the ABL dis per sion char ac ter is tics that are re quired for cal cu la tions of the po ten tial ra di a tion im pact on plant per son nel, the pub lic and the en vi ron ment in case of vi o la tions in normal NPP op er a tion, in clud ing ac ci dents, -to pre dict and timely de tect the trends in fluc tu ations of the ABL dis per sion char ac ter is tics over time, and -to de velop rec om men da tions aimed at mit i gat ing the ad verse im pact of NPP on the en vi ron ment. The ABL mon i tor ing pro vides for im ple men tation of con tin u ous ob ser va tion of the ABL sta tus, and first of all, the wind speed and di rec tion, as well as the air tem per a ture, which de ter mine the mode of at mospheric dis per sion.…”

Radiological Assessment of the Belarusian Nuclear Power Plant Site in the Pre-Operational Period

“…The comprehensive environmental monitoring program includes hygienic parameters for assessing radiation doses and the control of ecological contamination. Soil [3], bottom riverbed sediments [3,4], surface water [5] and the atmospheric boundary layer [6] can be selected as objects of environmental studies. The main technogenic radionuclides present in discharges, emissions and radioactive waste during the operation of nuclear power plants, as well as natural radionuclides, have been selected as controlled parameters [7,8].…”