2018 | AFC ACCOMPLISHMENTS 136 Figure1. Caption Figure 2. Caption Updated Advanced Reactor Fuels Handbook Principal Investigator: Dawn E. Janney Transmutation of minor actinides such as Np, Am, and Cm in spent nuclear fuel is of international interest because of its potential for reducing the long term health and safety hazards caused by the radioactivity of the spent fuel. One important approach to transmutation involves incorporating minor actinides into U-Pu-Zr alloys, which may also include rare-earth elements (La, Ce, Pr, Nd) as a result of previous reprocessing as part of a closed fuel cycle. It is important to understand the properties of U-Pu-Zr alloys, including those that also include minor actinides (Np,Am) and rare-earth elements (La, Ce, Pr, and Nd).The existing experimental data is widely scattered, and much of it was published before ~1975.The Metallic Fuels Handbook critically reviews the available experi- mentally based knowledge of several key properties of U-Pu-Zr alloys with and without minor actinides and rare- earth fission products. Project Description: Transmutation of minor actinides such as Np,Am, and Cm in spent nuclear fuel is important because of its potential for reducing long-term health and safety hazards caused by the radioactivity of the spent fuel. One important approach to transmutation (currently being pursued by the DOE Fuel Cycle Research & Development Advanced Fuels Campaign) involves incorporating the minor actinides into U-Pu-Zr alloys, which can be used as fuel in fast reactors.These fuels are well suited for electrolytic refining, which leads to incorporation rare-earth fission products such as La, Ce, Pr, and Nd. It is, therefore, important to understand not only the properties of U-Pu-Zr alloys but also those of U-Pu-Zr alloys that include minor actinides (Np,Am) and rare-earth elements (La, Ce, Pr, and Nd) in concentrations relevant for transmutation fuels. Previous revisions of this Handbook included information about elements and alloys in the U-Np-Pu-Am-La- Ce-Pr-Nd-Zr system.The primary emphasis of this revision is increasing the detail and comprehensiveness of information on U-Zr and U-Pu-Zr alloys, including information about a number of properties that are new to the Handbook. In addition, this revision updates information about the entire U-Pu-Zr-Np-Am-La-Ce- Pr-Nd system from earlier revisions. The handbook is intended to serve several audiences, including project leadership and management, researchers, and modelers. Accomplishments: The vast majority of the research and writing for this revision of the Handbook was done by the P.I., who is an INL employee. Some information was obtained from