Background: Small modular reactors, explained: who is building them worldwide
Current state
| Status | Under construction |
| Design | RITM-200S (PWR, SMR) |
| Net capacity | 50 MWe |
| Country | Russia |
| Vendor | Rosatom (OKBM) |
| Owner / operator | Rosatom |
| Construction start | — |
| Original COD target | — |
| Current COD estimate | 2028 |
| Schedule slippage | — |
Notes
Reactor-plant designer OKBM Afrikantov; vessels fabricated and tested at ZiO-Podolsk (Rosatom Mechanical Engineering Division). First-of-four PEB-106 hulls for the Baimskaya copper cluster; commissioning 2028 per NEI. WNN uses RITM-200C designation, Rosatom RITM-200S — same hardware.
Milestone log
- 2026-06-16 — Listed as under construction in the WNA world table, grid connection estimated 2028 (source)
- 2026-05-27 — First RITM-200S reactor unit manufactured at ZiO-Podolsk; railed to Baltisky shipyard for installation in the PEB-106 hull (source)
The milestone log is append-only: corrections are recorded as new entries, never rewrites. Full history via /api/v1/changes.
NNN coverage
On the RITM-200S design
Sources
- https://world-nuclear.org/nuclear-reactor-database/summary/report?report=gen&status=Under%20Construction
- https://pris.iaea.org/pris/
- https://www.world-nuclear-news.org/articles/first-ritm-200c-reactor-unit-manufactured-for-floating-power-plant
- https://www.neimagazine.com/news/first-ritm-for-baim-fnpp-manufactured/