Chernobyl Nuclear Power Plant Chernobyl, from the border of Ukraine and Belarus and about north of Kiev. Construction of the plant and the nearby city of Pripyat, Ukraine to house workers and their families began in 1970, with Reactor N. 1 commissioned in 1977. It was the third nuclear power station in the Soviet Union of the RBMK-type (after Leningrad and Kursk), and the first nuclear power plant on Ukrainian soil. The completion of the first reactor in 1977 was followed by reactor N. 2 (1978), N. 3 (1981), and N. 4 (1983). Two more blocks, numbered 5 and 6, of more or less
Tihange Nuclear Power Station power plants these were already built in after the nuclear disaster in Chernobyl in 1986. Other countries followed this example, latest after the Fukushima nuclear disaster. This kind of system allows for the containment pressure to be relieved in the event of a severe accident. The non-condensible gases that cause pressure within containment to rise are released through a stack (or chimney) via a filtration system that removes large quantities of fission products from the effluent. As part of the stress tests following the Fukushima incident, this issue had already been identified to be included in the stress-test action plan