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US Kairos Completes First Phase Testing of ETU 3 Reactor Model

Kairos Power announced on September 7 that its Engineering Test Unit 3 (ETU 3) has completed the first phase of testing. The testing, centered on the Hermes 2 reactor cavity model, validated the precast concrete shielding design as well as remote operation and maintenance capabilities, providing support for the design of the Hermes 2 demonstration plant and subsequent commercial units. Reactor cavity model (Image: Kairos Power) ETU 3, located in Oak Ridge, Tennessee, is part of Kairos Power's iterative development program for its fluoride salt-cooled high-temperature reactor (KP-FHR) technology. The unit is a scaled, non-nuclear mockup cavity consisting of a reactor pressure vessel and precast concrete shielding structures.

2026-09-08

Kairos Power Completes Phase 1 of ETU 3 Hardware Demonstration in the U.S.

On September 4, Kairos Power announced the completion of Phase 1 of the Engineering Test Unit 3 (ETU 3) hardware demonstration at its Oak Ridge, Tennessee site. The unit, a non-nuclear engineering test platform, is primarily designed to reduce technical risks in reactor construction, operation, and maintenance, and to provide validation data for the Hermes 2 demonstration plant and subsequent commercial reactor deployments. Kairos Power stated that Phase 1 of ETU 3 focused on design validation of precast concrete shielding structures and testing of remote operation and maintenance capabilities. Construction of the Hermes 2 demonstration plant began earlier this year in Oak Ridge, and ETU...

2026-09-06

NNSA Administrator Brandon Williams Visits Kairos Power to Review SMR Technology

Kairos Power, a U.S. small modular reactor developer, recently announced that Brandon Williams, Administrator of the National Nuclear Security Administration (NNSA), has visited the company's Manufacturing Development Campus in Albuquerque, New Mexico, to review its readiness for advanced reactor deployment. According to Kairos Power, Williams and his delegation toured the campus's advanced manufacturing, fuel development, molten salt production, modular systems, and large-scale hardware verification facilities. The campus serves as a key base for the company's advancement of fluoride salt-cooled high-temperature reactor technology and also supports the engineering validation and manufacturing capability development required for future reactor deployment.

2026-08-27