The article brings a short history of nuclear energy utilization in CSFR from the prototype of power station with the output 150 MWe up to the contemporary  capacity blocks with 440 MWe. It gives a more detailed analysis of the influence of the crashed and withdrawn nuclear power station A 1. It contains data of the level of contamination and isotope composition of contaminants of underground waters, the bottom and banks of the river Dudváh and the canal Manivier. In the conclusion the author evaluates radiological effects of the production of the nuclear power station A 1.