Timeline · 1957
The world's nuclear fleet in 1957
In 1957, 9 nuclear reactors were operating in 4 countries, 202 MWe net, with 26 under construction.
Compared with 1956, the operating fleet grew by 3 reactors. 4 reactors were connected to the grid that year, 146 MWe, mostly in United States (3) and United Kingdom (1). The countries with the most operating capacity were United Kingdom (109 MWe), Russia (55 MWe) and United States (31 MWe).
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Connected to the grid in 1957
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Calder Hall 2 |  United Kingdom | GCR | Magnox | 60 |
| Shippingport |  United States | PWR | WH | 60 |
| SM-1 | United States | PWR | unknown | 2 |
| Vallecitos | United States | BWR | BWR-1 | 24 |
Countries by operating capacity in 1957
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | United Kingdom | 2 | 109 | 15 |
| 2 |  Russia | 2 | 55 | 1 |
| 3 | United States | 4 | 31 | 5 |
| 4 |  France | 1 | 7 | 3 |
| 5 |  Belgium | 0 | 0 | 1 |
| 6 |  Sweden | 0 | 0 | 1 |
Data: Global Energy Monitor (CC BY 4.0), IAEA PRIS 2025, Wikipedia (CC BY-SA), Wikidata and Wikimedia Commons. Capacities in net MWe unless stated.
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