b'Unattended operationResearchers demonstrate the first automated and anticipatory through digitaldigital twin for nuclear reactors and establish INL as a leader in twininnovations the research and development of digital twin technologies.F ission batteries are envisioned as nuclear energy systems that can be used in a battery-like operation. They are economical, standardized, installed, unattended, and reliable. A digital twin consisting of bidirectional communication between an operating asset and digital models, such as machine learning and artificial intelligence or physics models, can predict the future state of the asset and automatically adjust its operation. This type of digital twin can aid in providing optimal performance, avoiding undesirable states or failures, and enabling unattended operation. A digital twin framework was created that includes the PROJECT NUMBER:aforementioned models for heat pipes, a technology for some microreactor designs. 21A1053-007FP This digital twin was connected to a heat pipe within the Microreactor Agile Non-nuclear Experimental Testbed for a live demonstration. The digital twin successfully TOTAL APPROVED AMOUNT:predicted future state throughout the demonstration and automatically adjusted the $1,650,000 over 3 years temperature set point of the heat pipe to avoid reaching boundary conditions. As the PRINCIPAL INVESTIGATOR:first digital twin to ever provide anticipatory and automated control to a microreactor Jeren Browning technology, this effort has sparked a strong interest in digital twin technologies and aided in funding more than ten new and ongoing digital twin efforts led by INL. CO-INVESTIGATOR: The framework created has been published as open-source software via six software Katherine Wilsdon, INL disclosure records and is actively used and further developed through various efforts. DOE recognized this research as a Nuclear Milestone and listed it as one of the 11 Big Wins for Nuclear Energy in 2022.45'