2018 | AFC ACCOMPLISHMENTS 137 previous INL publications whose authors are Douglas E. Burkes, James I. Cole, Randall S. Fielding, Steven M. Frank,Thomas Hartmann,Timothy A. Hyde, Dennis D. Keiser, Jr., J.Rory Kennedy, Andrew. Maddison, Robert D. Mariani, Scott C. Middlemas, Thomas P. O’Holleran, Cynthia A. Papesch, Bulent H. Sencer, and Leah N. Squires. Although some of these people are no longer employed at INL, all were INL employees when they performed the work used in the Handbook. Personnel from the INL Research Library provided invaluable help in finding obscure references, Dr. Pavel Medvedev (an INL employee) assisted with Russian- language translation, and Dr. Steven Hayes (an INL employee) provided insight and valuable guidance. It is expected that the Metallic Fuels Handbook will be a multi-year project with new versions available periodically. Although the titles of revisions varied, all were given the INL publication number INL/ EXT-15-36520. Each revision updated the data in the previous versions, as well as expanding the scope of the Handbook.The original Handbook (in 2015) included information about elements and alloys in the U-Pu-Zr system. Revision 1 (in 2016) contained information about the elements, binary alloys, and ternary alloys in the U-Np-Pu-Am-La-Ce-Pr- Nd-Zr system. Revision 2 (in 2017) added information about alloys whose nominal compositions include at least four elements. Revision 3 (in 2018) featured in-depth coverage of experimental results from U-Zr and U-Pu-Zr alloys. Each of the revisions includes information about phases and phase diagrams, heat capacities, thermal expansion, and thermal conductivities and diffusivities for the materials it covers; Revision 3 also includes some information about mechanical properties of some alloys.The Handbook has a strong bias in favor of experimental data when available, but supplements the experimental data by modeling results as needed.The Handbook also contains numerous references to other modeling papers as a guide for researchers. The 2017 revision was split into two documents because of its size. Part 1 contained information about U-Zr, Pu-Zr, U-Pu, and U-Pu-Zr alloys with and without minor actinides (Np, Am, Cm), rare-earth elements (La, Ce, Pr, Nd, Gd) andY. Part 2 contained information about elements and other alloys in the U-Np-Pu-Am-La-Ce-Pr- Nd-Zr system.This organization has been retained for the 2018 revision, which is almost 400 pages long. Because of the importance of U alloys with 10% Zr, experimental results from this alloy were published as a separate journal paper in August, 2018. The transmutation fuel package has supplied fuel samples for thermal and microstructural characterization as well as the fuel and assembly of the AFC-3F irradiation test. The handbook provides a single resource for data and critical reviews of important properties in the U-Np- Pu-Am-La-Ce-Pr-Nd-Zr system based on an extensive survey of widely scattered, often obscure, sources.