As an important part of nuclear science, nuclear reactor technology refer to the device which has the power to start, sustain and control a nuclear chain reaction. These devices are built on the technology of nuclear fission, reactivity control, heat generation, electrical power, etc. They are also used for electricity generation at nuclear power plants. This book aims to equip students in the field of nuclear science and technology. The topics covered in it are of utmost significance and are bound to provide thorough knowledge to the readers about this area. Different approaches, evaluations and methodologies on nuclear technology have been included in this textbook. Those in search of information to further their knowledge will be greatly assisted by it.