Chernobyl exclusion zone protection dyke on the pripyat river: collective dose reduction and cost-benefit analysis

The periodic floods at spring of the Pripyat river, near the Chernobyl plant, contribute to put back in suspension and to the dissolution of radioactive particles which settled during the accident of 1986 and remain present on the ground surface. These particles are then carried by the Pripyat river, then downstream by the Dnieper, to the black Sea. This secondary contamination is a significant radiological exposure source for the Ukraine population, living near the river. A project of a dam construction on the right side of the river, to supplement an existing similar dam on the left side, has been elaborated. A study of counter-evaluation relative to efficiency of the dam evaluation on a technical and a radiological domain, has been realized by the CEPN and the BG Consulting Engineers Ltd. In this framework, the CEPN realized the doses calculation and the cost benefit analysis. (A.L.B.)