Onkalo
Onkalo is a repository facility operated by Posiva Oy in Finland. Its capacity is not publicly disclosed.
The first deep geological repository for spent nuclear fuel anywhere, 400 metres down in Olkiluoto granite, using copper canisters in bentonite clay. Construction is complete and the encapsulation plant has been tested with dummy fuel; it awaits an operating licence, with emplacement expected to begin in 2026. Sweden's Forsmark repository, using the same KBS-3 method, is the second to start construction.
Facility
| Stage | Geological disposal |
|---|---|
| Operator | Posiva Oy |
| Country | Finland |
| Capacity | not disclosed |
| Figure applies to | - |
| Note on the figure | Licensed for roughly 6,500 tU of spent fuel over its operating life. |
| Status | construction |
| Commissioned | 2026 |
| Coordinates | 61.2350, 21.4800 |
Position in the chain
No disclosed capacity, so its share of world repository capacity cannot be stated.
Other repository facilities
| Facility | Capacity | Status |
|---|---|---|
| Wolsong LILW Disposal Center, Gyeongju | 800,000drums | operating |
| Konrad | 303,000m³ | construction |
| Yucca Mountain | 70,000tHM total | closed |
| Asse II | 47,000m³ | closed |
| Morsleben (ERAM) | 37,000m³ | closed |
| Forsmark spent fuel repository (KBS-3) | not disclosed | construction |
| Cigéo | not disclosed | planned |
| Canadian deep geological repository | not disclosed | planned |
| Nördlich Lägern | not disclosed | planned |
| Waste Isolation Pilot Plant | not disclosed | operating |
| SFR, Forsmark | not disclosed | operating |
| Olkiluoto VLJ repository | not disclosed | operating |
| Loviisa VLJ repository | not disclosed | operating |
| Centre de l'Aube (CSA) | not disclosed | operating |
| El Cabril | not disclosed | operating |
| Low Level Waste Repository, Drigg | not disclosed | operating |
| Rokkasho LLW Disposal Center | not disclosed | operating |
| Bátaapáti National Radioactive Waste Repository | not disclosed | operating |
| Yeniseisky underground research laboratory, Krasnoyarsk | not disclosed | construction |
| Beishan underground research laboratory | not disclosed | construction |
Sources
- Posiva Oy · retrieved 2026-09-06
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data