The book “Operational regimes of VVER” by Ovchinnikov and Semenov is a deep and comprehensive study that immerses the reader in the world of nuclear energy, focusing on the most important aspects of the operation of water-water power reactors (VVER) This publication will be of particular interest to specialists in the field of nuclear energy, engineers, students of specialized universities and everyone who seeks to gain a deeper understanding of the operation of modern reactors. The authors, Ovchinnikov and Semenov, have considerable experience in the field of nuclear physics and energy, which gives the book special value. They not only share their knowledge, but also offer the reader a unique look at VVER operating modes, which are the basis for ensuring the reliability and safety of reactors. The book covers a wide range of topics, including thermodynamic processes, hydraulic modes, as well as issues related to safety and operational efficiency. One of the key topics addressed in the book is the impact of different operating modes on reactor performance. The authors analyze in detail how changes in working conditions can affect the reliability and durability of equipment. This is particularly relevant in light of current challenges faced by nuclear power, such as the need to improve efficiency and reduce environmental impact. Readers will be able to learn about how optimizing operating modes can lead to significant improvements in reactor performance, making the book an important source of information for professionals in the field. The book also addresses issues related to innovation and new technologies in the field of nuclear energy. Ovchinnikov and Semenov discuss how modern developments can change the approach to the operation of VVER, and what prospects open up for the industry in the light of technological changes. This makes the publication relevant not only for professionals, but also for students who are just beginning their journey in the world of nuclear energy. The style of the authors is distinguished by clarity and accessibility, which allows even those who do not have deep knowledge in the field of nuclear physics to understand the basic ideas and concepts. The book is written in such a way that every reader will be able to find something useful for himself in it, whether it be theoretical foundations or practical recommendations. This makes VVER Operating Modes not only a textbook, but also a reference book for anyone interested in the future of nuclear power. If you are looking for literature that will help you better understand the operation of nuclear reactors, or want to deepen your knowledge in this area, then this book will be a real find for you. It will be useful to both experienced professionals and students seeking new knowledge . Readers interested in the safety of nuclear installations, the efficiency of energy processes and innovations in nuclear energy will find in this publication a lot of interesting and useful information. In conclusion, “Operational regimes of VVER” is not just a book, but a whole world of knowledge that opens the door for the reader to the future of nuclear energy. Ovchinnikov and Semenov offer not only facts and figures, but also in-depth analysis that will help to understand how to make nuclear energy safer and more efficient. If you want to be up to date with the latest trends and technologies in this important field, don’t miss the opportunity to get to know this unique work.