When the world’s populace is growing, necessities are also getting increased accordingly in terms of energy. World scientists have brought Science and technology to advanced level, in order to meet human needs efficiently. Due to the expansion of science and technology, the revenue of the countries around world is evolving. For the active expansion of the world’s revenue, high-quality, regular and sufficient electricity supply is obligatory. In the current century, variety of energy resources are employed in expansion of societies and the share of power generation from nuclear energy is crucial in the energy fusion but the level of safety should not be reduced in the operation of nuclear power plants, particularly the older ones which are being run on oldest technologies. In this review article, we are investigating different articles of nuclear power plants and their approaches to address issues arising day by day in nuclear research.