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Editorial on the Research TopicAdvances in Nuclear Power Engineering Nuclear power has been used widely around the world and is considered a highly efficient and clean energy source (Kim and Alameri, 2020). Many organizations around the globe are leading the efforts to develop new technologies to improve the economy and safety (Openshaw 2019). The research topic "Advances in Nuclear Power Engineering" aims to publish the most advanced and timely research results. The articles include research results on Gen IV reactors, small modular reactors, reactor physics, reactor thermal hydraulics, advanced safety technologies, and related topics. Variety of important areas are covered in these topics including theoretical, computational, and experimental thermal-hydraulics, multiphase heat transfer, neutronics, uncertainty analysis, aerosol transport, and scaling considerations. Zhang et al. discuss on the Gen IV sodium-cooled fast reactor heat transfer in their article "Theoretical Investigation on the Fully Developed Turbulent Heat Transfer Characteristics of Liquid Sodium." In the article "Numerical Analysis of FLiBe Laminar Convective Heat Transfer Characteristics in Tubes Fitted with Coaxial Cross Twisted Tape Inserts," Yang et al. present computational heat transfer results on Gen IV molten salt reactor. Zhang et al. discuss design of the small modular reactors in the article "Comparisons of Reduced Moderation Small Modular Reactors with Heavy Water Coolant." Those works provide an insight view of the nextgeneration reactor design include not only high temperature Gen IV reactors but also small modular light water reactor. Song et al. share their results of computational studies in the article "GPU Based Two-Level CMFD Accelerating Two-Dimensional MOC Neutron Transport Calculation." The neutronic work shows the multidimensional neutronic and thermal information in the reactor core. The results on thermal-hydraulics experimental work are given by Li et al. in the article "The Effect of Different Branch Angles and Different Branch Pipe Sizes on the Onset Law of Liquid Entrainment"; Gao et al. in the article "Influence of the Size and the Angle of Branches Connected to the Main Horizontal Pipe on the Onset of Gas Entrainment"; Mao et al. in the article "Natural Convection Heat Transfer of the Horizontal Rod-Bundle in a Semi-closed Rectangular Cavity"; Ren et al. in the article "Visualization Experiment of Bubble Coalescence in a Narrow Vertical Rectangular Channel"; and by Wang et al. in the article "Study on the Breakdown Mechanism of Water Film on Corrugated Plate Wall Under the Horizontal Shear of Airflow: A Short Communication." The experimental thermal-hydraulics work aims at the improvement of the heat transfer coefficient and reactor safety. Other thermal-hydraulics related works include the work of Wang et al. in the article "Review and Prospect of the Measurement Technology of the Thickness of the Liquid Film on the Wall of the Corrugated Plate Dryer"; Saeed et al. in the article "Sensitivity Analysis of Some K...