Radiation situation in zones of production activities of construction east and west walls enclosing contour new safe confinement and forecast of its changes in progress - D. V. Gorodetskij; V. V. Derengovskij; V. V. Egorov; L. I. Pavlovskij; A. A. Kholodjuk (Problems of nuclear power plants safety and of Chornobyl, 2015)