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ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

N.V. Kulich, V.I. Nikolaev, A.I. Lypska, L.V. Sadovnikov, O. Burdo

Updated: Dec 11, 2020

Accidental Radioactive Fallout in the Drained Areas of the ChNPP Cooling Pond

N.V. Kulich, V.I. Nikolaev, A.I. Lypska, L.V. Sadovnikov, O. Burdo (Institute for Nuclear Research, NAS, Ukraine)


Radionuclide contamination and migration processes in soils on the drained areas of the cooling pond bottom were studied. Soil samples were taken from different points of the cooling pond. The measurement results show that over 80% of radionuclide activity is found at a depth of 10 –20 cm. The presence of radionuclides 241Am, 137Cs, 90Sr, and highlighted activities of 155Eu and 154Eu and 60Co and 94Nb were found. Analysis of the ratios of 60Co and 94Nb showed that, most likely, this is the fallout from the first explosion of the 4th unit of the ChNPP. Fallout at a depth of 0-10 cm is mainly associated with the deposition of aerosol fallout during subsequent years. The cooling pond radionuclide contamination is associated with fallout in the early post-accident period. Vertical migration of the radionuclides at cooling pond drained areas correlate with vertical migration of aerosol fallout in the 30-km zone of the ChNPP.

ChNPP冷却池の排水区域における事故由来の放射性降下物

N.V. Kulich, V.I. Nikolaev, A.I. Lypska, L.V. Sadovnikov, O. Burdo (Institute for Nuclear Research, NAS, Ukraine)


冷却池の底の排水区域の土壌中の放射性核種汚染と移行プロセスが調査された。土壌サンプルは冷却池のさまざまな地点から採取された。測定の結果、放射性核種の80%超が深さ10〜20 cmの地点で発見されたことが示されている。放射性核種241Am、137Cs、90Srの存在、及び155Euと154Eu、60Co、94Nbの高い放射能が確認された。60Coと94Nbの比率を分析した結果、それがChNPP 4号機の最初の爆発による降下物である可能性が最も高いことが示された。深さ0~10 cmの降下物は、主にその後数年間のエアロゾル降下物の沈着と関連する。冷却池の放射性核種汚染は事故後初期の降下物と関連する。冷却池の排水区域における放射性核種の垂直移行は、ChNPPの30 km圏内におけるエアロゾル降下物の垂直移行と相関する。

Paper-C45_NVKulich-etal
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