Latest milestone
DOE reported Hermes 2 groundbreaking after the NRC issued two construction permits.
2026-04 · NRC Hermes 2 record
Open primary source ↗← All deployments
Hermes 2
Two non-power test reactors intended to support commercial validation of Kairos Power's KP-FHR technology.
Lead company · Kairos Power →
Program · ARDP risk reduction
Construction underwayHigh confidence
Deployment stage6 / 8Physical
Deployment trajectory
1Interest
2Preliminary
3Development
4Contractual
5Ready
6Physical
7Operational
8Replication
Next milestone
Complete nuclear construction, request operating licenses, then load fuel and test.
- Responsible
- Kairos Power and NRC
- Key blocker
- Construction execution and later operating authorization
GenerationGen IV
ScaleTest reactor
Reactor familyFHR
RoleResearch / test
CapacityTwo low-power test reactors
Reporting basisVerified