Progress in Nuclear Energy comprises six chapters, with the first focusing on decay heat. It delves into an evaluation of decay heat, confirmation of summation calculations, and the effect of neutron absorption in fission products. Chapter 2 focuses on resonance absorption calculations in thermal reactors, discussing topics such as resonance reaction rates and group average resonance, calculation of effective resonance integrals, and direct calculations of resonance reaction rates using resonance parameters or tabulated cross-sections. Chapter 3 deals with noise investigations in boiling-water and pressurized-water reactors, discussing topics such as point kinetic behavior and space dependence, noise investigations in boiling-water reactors, and noise investigations in pressurized-water reactors. Chapter 4 focuses on fast reactor burnup and breeding calculation, discussing topics such as fuel cycle analysis and description of breeding. Chapter 5 discusses the historical development of heat transfer surfaces for gas-cooled reactors analyzed with a simple criterion. The final chapter focuses on the evaluation of differential nuclear data for americium isotopes. This book will be of interest to practitioners in the fields of physics and nuclear energy.