Hermes

In Development

Overview

35 MWth low-power demonstration reactor validating Kairos Power's KP-FHR design, construction methods, fuel program, and operating approach in Oak Ridge, Tennessee.

Construction permit granted in December 2023; nuclear safety-related construction began in May 2025, with operation targeted for 2027.

Key Specs

Thermal Output

35 MWth

Reactor Type

Fluoride salt-cooled high-temperature reactor (FHR)

Coolant

FLiBe (lithium fluoride-beryllium fluoride)

Fuel

HALEU TRISO pebble fuel

Location

Oak Ridge, Tennessee

Target Operation

2027