Olkiluoto nuclear power plant 1
Gross capacity
920MW
Olkiluoto nuclear power plant 1 is a boiling water reactor unit at Olkiluoto nuclear power plant in Finland rated at 920 MW gross. It is operating. Commercial operation began 10 Oct 1979.
Specification
| Reactor type | Boiling water reactor (BWR) |
|---|---|
| Model | ASEA-Atom BWRAA-III, BWR-2500 in the source |
| Size | Largeabove 300 MWe |
| Coolant | Light water |
| Moderator | Light water |
| Gross capacity | 920MW |
| Net capacity (reference) | 890MW |
| Net capacity (design) | 660MW |
| Thermal output | 2,500MWt |
| NSSS vendor | not on record |
| Typical enrichment | 3–5% U-235 |
Ownership & location
| Site | Olkiluoto nuclear power plant |
|---|---|
| Unit | 1 |
| Country | Finland |
| Owner | Teollisuuden Voima Oyj100% |
| Operator | Teollisuuden Voima |
| Coordinates | 61.2371, 21.4433 |
Live status
Nord Pool UMM, declared availability
State
…
loading
Available capacity
…
Last 90 days, one cell per day
Declared: an outage or limit the operator has announced. No outage declared is not a confirmation that the unit is running.
See every unit outside the US.
Fuel chain for this unit
Fuel form
Uranium dioxide pellets in zirconium-alloy cladding
Enrichment
3–5% U-235
Who makes this assembly
- Framatome BWR fuel assemblies
- Global Nuclear Fuel BWR fuel assemblies
- Westinghouse Electric Company BWR fuel assemblies
Supply position
Finland runs 2 operating units on BWR fuel. 3 fabricators are documented for it. No documented fabricator is based in Finland. Country exposure
Upstream
Enriched fuel means this unit sits downstream of five conversion plants and four enrichment operators holding 88% of world capacity between the top three.
Fabricator capability is recorded against reactor type and model line, not against named units,
utilities do not publish fuel contracts. See the fuel chain.
Timeline
- 1 Feb 1974Construction start
- 21 Jul 1978First criticality
- 2 Sep 1978Grid connection
- 10 Oct 1979Commercial operation
Other units at Olkiluoto nuclear power plant
| Unit | Status | Gross MW |
|---|---|---|
| Olkiluoto nuclear power plant 2 | 920 | |
| Olkiluoto nuclear power plant 3 | 1,720 | |
| Olkiluoto nuclear power plant 4 | Cancelled | 1,830 |
Other AA-III, BWR-2500 units
4 units worldwide share this model designation.
| Unit | Country | Status | Gross MW |
|---|---|---|---|
| Forsmark nuclear power plant 1 | Sweden | 1,078 | |
| Forsmark nuclear power plant 2 | Sweden | 1,160 | |
| Olkiluoto nuclear power plant 2 | Finland | 920 |
Sources
- Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release , CC BY 4.0 · retrieved 2026-09-06 · this unit last researched by GEM on 2024-05-08
- GEM.wiki entry (further reading) , CC BY-SA 4.0, linked, not quoted
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data