Nuclear Reactor Safety is an introductory book on nuclear reactors and safety. The book begins with introduction to the applications of nuclear energy in power production, industry, medicine and food preservation, followed by the different types of reactors. Then it deals with the different safety principles, safety approaches and quality assurance and engineered safety of Nuclear reactors. Safety regulation and practices in the Indian Nuclear Power Plants have been detailed out for a good understanding. Finally it introduces the reader to the passive safety approaches being utilized and contemplated for new designs besides sharing some aspects of public acceptance of nuclear energy. Basic reactor physics and analysis of some exceptional events in nuclear reactors are given in the annexures.