(a) Number of nuclear-power reactors of the world put into commercial operation versus years as per November 2018 (based on data from Nuclear News [23,32]) [1]; Four reactors (India 2 × 150 MW_el; Switzerland 1 × 365 MW_el; and USA 1 × 613 MW_el and 1 × 650 MW_el) have been put into operation in 1969, i.e., they operate for almost 50 yr. It is clear from this diagram that the Chernobyl NPP accident has tremendous negative impact on nuclear-power industry, which is lasting for decades, and, currently, we have additional negative impact of the Fukushima Daiichi NPP accident. (b) Number of nuclear-power reactors in the world by installed capacity as per November 2018 [23,33]. For better understanding of this diagram, the largest number of reactors has installed capacities within the range of 900–999 MW_el.