Assessment of the Distribution of Radionuclides and Impact of Industrial Facilities in the Chornobyl Exclusion Zones
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FINAL REPORT Assessment of the Distribution of Radionuclides and Impact of Industrial Facilities in the Chornobyl Exclusion Zones under the GEF project “Conserving, Enhancing and Managing Carbon Stocks and Biodiversity in the Chornobyl Exclusion Zone” Reporting period 01 November 2017 – 31 March 2018 Agreement SSFA/2017/19 S1-32GFL-000370/11232/SB-000687.37/14AC0003 Institute for Radiation Measurement and Development (IRMD) Conserving, Enhancing and Managing Carbon Stocks and Biodiversity in the Chornobyl Exclusion Zone SUMMARY This technical report includes information on the distribution of radionuclides that originated from the accident within the Chornobyl exclusion zone (ChEZ). The existing systems of routine and precision (scientific) radioecological monitoring were analyzed and approaches to their optimization are proposed. This report presents results of the latest field studies, which were carried out in the ChEZ during November 2017 - March 2018, and earlier historical data that follow the subjects of Tasks C and D. Comparison of the latest and historical data shall provide an opportunity to assess changing dynamics of the radiation situation parameters in the ecosystems of ChEZ. Distribution of radionuclides within the ChEZ was mostly preconditioned by the initial release of irradiated fuel from the emergency Chornobyl reactor (1986). The initial pattern of contamination has changed significantly during the works for the liquidation of the accident consequences. Also, the initial radiation contamination pattern of ChEZ ecosystems was and is still subject to changes due to various natural processes. As for possible redistribution of radioactive contamination within the ChEZ, special attention was paid to the sites containing radioactive materials and located within the ChEZ, such as RWTLS, RWDS, ChCP and some other man-made objects. Regular observations of radiation situation in the ChEZ (routine monitoring) shall allow identification and assessment of its trends and timely corrective measures for radiation protection of personnel, people and the environment, as appropriate. A prospective area of scientific monitoring in the ChEZ is related to studying the long-term radioecological and radiobiological effects, as well as provision of information for long-term forecasting of changes in exposure doses of humans and biota within and outside ChEZ based on verified mathematical models of radionuclide behaviour in the environment. This report consists of 203 text pages including 33 tables, 97 pictures and photos, 2 appendixes, bibliography with 252 references. 2 Conserving, Enhancing and Managing Carbon Stocks and Biodiversity in the Chornobyl Exclusion Zone CONTENTS 1 GOALS, OBJECTIVES AND CRITERIA OF EFFECTIVENESS OF RADIOECOLOGICAL MONITORING IN THE CHEZ ............................................ 7 1.1 Description of monitoring objects ......................................................................................... 8 1.1.1 Natural objects ................................................................................................................ 8 1.1.2 Industrial (man-made) facilities ..................................................................................... 9 1.1.3 Population centers ........................................................................................................ 11 1.2 Routine monitoring .............................................................................................................. 11 1.2.1 Forests and meadows ................................................................................................... 11 1.2.2 Surface waters .............................................................................................................. 12 1.2.3 Groundwater ................................................................................................................. 12 1.2.4 Population centers, where people live (the “self-settlers”) .......................................... 12 1.2.5 Man-made objects ........................................................................................................ 13 1.2.6 Air in the ChEZ ............................................................................................................ 14 1.3 Scientific monitoring ........................................................................................................... 17 1.3.1 Forests and meadows ..................................................................................................... 18 1.3.1 Research of radiobiological effects .............................................................................. 23 2 OPTIMIZATION OF RADIOECOLOGICAL MONITORING IN THE ChEZ 38 2.1 Retrospective of the network of research sites for scientific radioecological monitoring in the ChEZ ........................................................................................................................................ 38 2.2 Routine monitoring .............................................................................................................. 43 2.3 Scientific monitoring ........................................................................................................... 44 2.3.1 Development of criteria and requirements for the monitoring system of terrestrial ecosystems .................................................................................................................................. 44 3 APPROBATION OF SCIENTIFIC MONITORING IN THE ChEZ ECOSYSTEMS ........................................................................................................... 49 3.1 Air ........................................................................................................................................ 49 3.2 Surface waters ...................................................................................................................... 50 3.3 Groundwater ........................................................................................................................ 51 3.4 Monitoring of meadow and meadow-shrub ecosystems ..................................................... 51 3.5 Justification, selection, organization and equipment of experimental sites for terrestrial ecosystems ...................................................................................................................................... 54 3.5.1 Definition of requirements ........................................................................................... 54 3.5.2 Experimental efforts on forest sites. Determination of inventories and fluxes of biologically mobile radionuclide in typical forest plantations ................................................... 58 3.5.3 Organization of experimental sites in forest test areas to further determine redistribution of biologically mobile radionuclides in typical forest stands .............................. 75 4 MAN-MADE OBJECTS. INFRASTRUCTURE FACILITIES, INCLUDING THE CHCP AND RADIOACTIVE MATERIALS LOCALIZATION SITES ......... 77 4.1 Comprehensive statistical analysis of landscape diversity in industrially impacted areas .. 77 4.2 Approbation of radioecological monitoring in the ChEZ ecosystems subjected to severe anthropogenic impacts .................................................................................................................... 82 4.3 Monitoring of the RWTLS effects for surrounding ecosystems (by the example of a pilot site at trench No.22 in the “Red Forest”) ....................................................................................... 83 4.3.1 Characterization of еру experimental site .................................................................... 84 4.3.2 Radioactive contamination of soil cover ...................................................................... 85 4.3.3 Physicochemical characteristics of radioactive waste .................................................. 87 3 Conserving, Enhancing and Managing Carbon Stocks and Biodiversity in the Chornobyl Exclusion Zone 4.3.4 Radioactive contamination of vegetation ..................................................................... 88 4.3.5 Radiobiological effects of chronic exposure ................................................................ 89 4.3.6 Lateral migration of radionuclides with groundwater flow ......................................... 89 4.3.7 Impact of biogenic transport of radionuclides on their redistribution in topsoil .......... 95 4.3.8 Monitoring of 36Cl concentrations in the groundwater of RWTLS "Red Forest" ........ 96 4.3.9 Impact of fires on the mobility of radionuclide migration in soil cover ...................... 97 4.3.10 Impact on surface air in case of fires .......................................................................... 104 4.4 Monitoring of ChNPP cooling pond .................................................................................. 105 4.5 Main directions of radioecological monitoring of the environmental impacts produced by man-made facilities ...................................................................................................................... 120 5 MONITORING OF NATURAL ECOSYSTEMS ............................................. 122 5.1 Network of radioecological monitoring existing in the ChEZ .......................................... 122 5.2 Scientific monitoring of radiobiological effects in natural ecosystems............................. 126 5.3 Radioecological monitoring of aquatic ecosystems .........................................................