INL launches molten salt examination hub for next gen reactors

by Clarence Oxford
Los Angeles CA (SPX) Feb 23, 2026
The National Reactor Innovation Center at Idaho National Laboratory is preparing to bring a new molten salt research capability online in March, marking a key step in the development of advanced reactor and fuel cycle technologies.

The Molten Salt Thermophysical Examination Capability, or MSTEC, is a shielded argon glove box designed to handle irradiated and nonirradiated actinide materials, with a focus on high temperature liquid fuel salts. The system is one of several National Reactor Innovation Center test capabilities created to support the growth of nuclear energy technologies in the United States.

The lab formally unveiled MSTEC during a small ceremony attended by the engineering and design team, along with leadership from the US Department of Energy Office of Nuclear Energy and Idaho National Laboratory. Officials described the facility as essential infrastructure for companies and researchers working on next generation nuclear systems.

"The establishment of MSTEC marks a major achievement in our quest to advance next generation nuclear reactor technologies," said Brad Tomer, director of the National Reactor Innovation Center. "By offering the essential experimental infrastructure and expertise to industry, MSTEC will be pivotal in addressing our national energy objectives and propelling the future of nuclear power."

Multiple molten salt reactor concepts are under development in the United States and abroad. Developers are pursuing different designs and fuel cycles, but all need better data on how fuel salts perform under operating conditions in order to raise technical readiness levels and reduce risk ahead of reactor deployment.

MSTEC is built to provide that data. The capability combines specialized instruments for measuring how molten salts and other materials behave under a range of temperatures and conditions with flexible laboratory space for small scale experiments. It gives users the tools, facilities and in house expertise needed to generate consistent information for reactor design, testing, licensing and eventual operation.

"MSTEC will significantly advance fuel salt technologies for the Department of Energy, industry and academia," said INL senior molten salt researcher Toni Karlsson. "It also offers a unique platform for training future actinide scientists and fuel cycle researchers."

Locating MSTEC at Idaho National Laboratory ties it directly into several other nuclear research assets at the site. Nearby facilities include the Neutron Radiography Reactor and the Advanced Test Reactor, which can irradiate salt samples and other materials to simulate reactor conditions, and the Analytical Research Laboratories, which provide detailed isotopic and elemental analysis.

By combining MSTEC with these reactors and analytical labs, Idaho National Laboratory is positioning the site as a central hub for molten salt reactor research and innovation. The integrated capabilities allow scientists and engineers to prepare, irradiate, examine and characterize fuel salts and related materials within a single complex.

MSTEC will also serve as a training ground for scientists, engineers and operations staff who will work with actinide bearing molten salts and related fuel cycle technologies. Laboratory leaders expect the facility to help build the workforce needed to support future deployment of advanced reactors.