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LLNL, Ampera partner to develop thorium-based TRISO fuel
Lawrence Livermore National Laboratory has formed a strategic partnership with Ampera to develop the company’s nuclear fuel concept through a project named THUNDER, for Thorium Unimodal Droplet Ejection for Reactors.
The focus of THUNDER is fabricating TRISO made with kernels of thorium rather than the usual uranium. LLNL and Ampera will evaluate and optimize liquid metal–jetting technology to produce highly uniform, spherical kernels of thorium-232 for later processing into TRISO fuel.
A. P. Herbert, B. Fisher, M. Granger, M. Blood, N. DeSotel
Nuclear Technology | Volume 211 | Number 2 | October 2025 | Pages S9-S16
Research Articles | doi.org/10.1080/00295450.2024.2431777
Articles are hosted by Taylor and Francis Online.
Space nuclear systems (SNSs) present a robust source of power and/or propulsion technology that will fundamentally enhance and expand deep-space mission capability. In this era of space nuclear renaissance, there are several active U.S. SNS programs, one of which is seeking the first space reactor launch approval of the modern era. SNSs present complex systems with unique and novel challenges for established launch safety procedures, particularly for prelaunch and initial launch operations as prescribed by the U.S. government’s federal ranges. This paper examines high-level range safety considerations for a model expander cycle nuclear thermal propulsion SNS during ground processing and the pad and launch operational phases.