Jun 13, 2013on 26 april 1986, the number four reactor at the chornobyl nuclear power plant in what then was the soviet union during improper testing at low-power, resulted in loss of control that led to. On april 26, 1986, the number four rbmk reactor at the nuclear power plant at chernobyl, ukraine, went out of control during a test at low-power, leading to. Nov 26, 2019the april 1986 accident at the chernobyl nuclear power plant remains a defining moment in the history of nuclear energy.
The czechoslovak socialist republic had signed the convention, not subject to ratification, on 26 september 1986. In sweden radiation measurements (in microroentgen per hour at ground level) during the period 1-8 may 1986 showed the highest levels near the city of gavle (400 microroentgen per hour and higher.