INL, NRIC Unveil MSTEC for Molten-Salt Thermophysical Testing of Irradiated Materials

Idaho National Laboratory and its National Reactor Innovation Center publicly unveiled the Molten Salt Thermophysical Examination Capability (MSTEC) on February 19, 2026, adding a shielded argon glovebox laboratory dedicated to thermophysical testing of irradiated materials at the INL site. The announcement positions MSTEC as a new, in‑house asset for handling samples that require inert-atmosphere, radiation-shielded examination.

MSTEC is described as a shielded argon glovebox laboratory, built to handle irradiated and non-irradiated samples for molten-salt thermophysical measurements. The configuration emphasizes both radiological shielding and an argon environment, allowing direct measurement tasks that depend on preventing oxidation and maintaining controlled atmospheres while working with radioisotopically active materials.

The facility was publicly unveiled by INL and NRIC on February 19, 2026 at Idaho National Laboratory, signaling that the capability has moved from construction to the laboratory's operational portfolio. MSTEC’s placement at INL ties the capability to the laboratory’s existing infrastructure for reactor materials and fuels work, giving researchers a local option for irradiated molten-salt property characterization without external transfers that would require additional handling approvals.

By focusing on thermophysical testing of irradiated materials, MSTEC targets measurements such as density, viscosity, thermal conductivity, and heat capacity under controlled conditions in argon atmosphere with radiological containment. Those measurements are core inputs for modeling and engineering of molten-salt systems, and having a shielded glovebox arrangement on site reduces logistic and regulatory hurdles for experiments involving activated salts.

The public unveiling on February 19, 2026 places MSTEC into the NRIC-managed suite of capabilities intended to accelerate reactor innovation at Idaho National Laboratory. With the glovebox laboratory in place, developers and researchers working on molten-salt concepts now have a dedicated INL facility for thermophysical characterization of irradiated samples, enabling nearer-term generation of experimental data critical to design and safety analyses.