Environmental problems associated with decommissioning the Chernobyl Nuclear Power Plant Cooling Pond

Area of Science:

• Environmental Science
• Nuclear Decommissioning
• Radioecology

Background:

• The Chernobyl Nuclear Power Plant (ChNPP) Cooling Pond is a large, contaminated water body requiring decommissioning.
• Significant radionuclide inventories (¹³⁷Cs, ⁹⁰Sr, ²³⁹+²⁴⁰Pu) are present in the pond's bottom sediments.
• The pond supports a diverse ecosystem, including numerous algae, invertebrate, and fish species.

Purpose of the Study:

• To evaluate decommissioning options for the ChNPP Cooling Pond.
• To assess environmental problems and radiation exposure risks associated with decommissioning.
• To analyze potential dose rates for shoreline biota under different scenarios.

Main Methods:

• Review of ChNPP Cooling Pond decommissioning strategies.
• Assessment of radionuclide contamination levels in bottom deposits.
• Estimation of radiation exposure doses for various biota (amphibians, birds, mammals, reptiles).

Main Results:

• Radionuclide inventory: ¹³⁷Cs (16.28 ± 2.59 TBq), ⁹⁰Sr (2.4 ± 0.48 TBq), ²³⁹+²⁴⁰Pu (0.00518 ± 0.00148 TBq).
• Estimated dose rates in 2008: amphibians (11.4–40 μGy h⁻¹), birds (6.3 μGy h⁻¹), mammals (15.1 μGy h⁻¹), reptiles (10.3 μGy h⁻¹).
• Drying the pond could elevate dose rates significantly, exceeding recommended limits for all studied species.

Conclusions:

• Decommissioning the ChNPP Cooling Pond requires careful consideration of environmental impacts.
• Drying the pond poses a substantial risk of increased radiation exposure to wildlife.
• Alternative decommissioning strategies must mitigate risks to the adjacent ecosystem.