The book "The Handbook of Nuclear-Physical Constants for Calculation of Reactors", written by a team of authors led by I. In. Proudly, D. A. Kardashev, A. In. Small and A. K. Krasin, is an indispensable resource for specialists in the field of nuclear physics and engineering. This handbook will certainly become an important tool for both students studying nuclear technology and professionals working in the design and operation of nuclear reactors. The book covers a wide range of nuclear-physical constants necessary for accurate calculations and analysis in the field of nuclear energy. It includes data on neutron interaction cross-sections with different materials, heat transfer coefficients, as well as other important parameters that play a key role in the functioning of reactors. Each section of the book is permeated with deep scientific research and relevant examples, which makes the material not only theoretically sound, but also practical. This work will be of interest not only to professional physicists and engineers, but also to graduate students, students of technical universities, as well as everyone who is interested in nuclear energy and its application. The book will be a useful reference material for researchers working on new projects and technologies in the field of nuclear energy, as well as for teachers who will be able to use it in the educational process. One of the key topics raised in the book is the importance of accuracy of calculations in nuclear energy. The authors emphasize that even the slightest deviations in the values of nuclear-physical constants can lead to serious consequences, both in the design of reactors and in their operation. This makes the book particularly relevant in light of the current challenges facing the nuclear industry, such as safety, efficiency and sustainability. The style of the authors is clear and accessible, which allows readers to easily assimilate even the most complex concepts. Each section is accompanied by illustrations and tables, which makes the information more clear and understandable. The authors, with extensive experience in nuclear physics, share their knowledge and findings, which gives the book special value. In addition, it is worth noting that the team of authors has many other significant publications in the field of nuclear physics and energy. Their experience and scientific achievements make this book not only a reference book, but also a real textbook that can serve as a basis for further research and development. If you are looking for a reliable source of information on nuclear-physical constants that will help you in calculations and analysis in the field of nuclear energy, then the “Directory of nuclear-physical constants for reactor calculations” will become your faithful assistant. This book will not only expand your knowledge, but also inspire new ideas and projects in the field of nuclear physics. Do not miss the opportunity to immerse yourself in the world of accurate calculations and discoveries that can change the future of nuclear energy!