goingcritical:brest-od-300Russia · SMR
BREST-OD-300
Status: Under construction target criticality 2026 (confidence: low) Reactor status full glossary → Announced Publicly announced — a site and design are proposed, but construction has not begun. Site preparation Early site and civil works are under way; the first safety-related ("nuclear") concrete has not yet been poured. Under construction Formal construction has begun, marked by the first nuclear concrete. Fuel loaded Nuclear fuel has been loaded into the core. The reactor is fuelled but has not yet gone critical. Critical Has reached first criticality — a self-sustaining chain reaction, usually at low power — but is not yet connected to the grid. Grid connected Synchronised to the electrical grid and exporting power for the first time, but still in commissioning and power-ascension testing — not yet in commercial service. In commercial operation — the operator has formally declared the unit in regular commercial service. Shut down Permanently shut down and no longer generating; may be defuelled, undergoing decommissioning, or preserved in place. Canceled Abandoned before completion.
Site: Seversk, Tomsk Oblast
World's first lead-cooled fast reactor demonstration unit, core of the Proryv closed-fuel-cycle pilot complex
Rosatom-stated physical launch target of 2026 with grid connection planned for H1 2027; some reports indicate the launch may slip to 2029 pending additional R&D
Details
| Design | BREST-OD-300 lead-cooled fast reactor (nitride fuel) |
| Electrical output | 300 MWe |
Milestone history
- Announced —
- Construction start June 2021
- Fuel load —
- First criticality target 2026
- Grid connection —
- Commercial operation —