After the accident at the Fukushima Daiichi nuclearpower plant, many institutions around the worlddeveloped the development of accident-tolerant fuel(ATF). Many institutions in China have been conductingresearch and development on accident tolerant fuels.NPIC plays the most important role in the CNNCAccident Tolerant Fuel (ATF) program, which aims todevelop advanced fuels and claddings that have improvedperformance under normal conditions, design basisaccidents (DBA) and beyond design basis accidents(BDBA). Due to its excellent corrosion resistance, FeCrAlstainless steel has become one of the most important ATFcladding concepts. The FeCrAl concept provides theoperator with some extra coping time to deal withaccident conditions compared to traditional zirconiumbasedcladding. Uranium mononitride has been identifiedas an alternative fuel with higher uranium density andthermal conductivity when compared to UO_2. In NPICATF campaign, FeCrAl is one of the advanced claddingconcepts and UN is one of the advanced fuel candidates.NPIC has developed about 4m full-length thin-walledFeCrAl tubes with several varied chemical compositionas fuel rod cladding. NPIC also prepared UN fuel pelletsby sintering. This paper focuses on in-pile performanceanalysis of UN fuel rod with FeCrAl cladding, so as tomake suggestions for future FeCrAl-UN fuel rodresearch, preparation and application. This paper usesFUPAC code to make analysis on fuel rod in-pileperformance. The simulation uses the most recentlyknown material properties. Some analyses of FeCrAl-UNfuel rod performance at steady state conditions areperformed. And the results show that FeCrAl-UN fuel rodhas good performance in aspects such as fueltemperature, fission gas release, fuel rod internalpressure, etc. Finally, future research and developmentwork are discussed.
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