Timeline · 1957
The world's nuclear fleet in 1957
In 1957, 9 nuclear reactors were operating in 4 countries, 129 MWe net, with 26 under construction. 5 of those units are not included in the net capacity because no net figure has been published for them.
Compared with 1956, the operating fleet grew by 3 reactors. 4 reactors were connected to the grid that year, 136 MWe, mostly in United States (3) and United Kingdom (1). The countries with the most operating capacity were United Kingdom (100 MWe), United States (24 MWe) and Russia (5 MWe).
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Connected to the grid in 1957
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Calder Hall 2 |  United Kingdom | GCR | Magnox | 50 |
| Shippingport |  United States | PWR | Pressurized Light Water Breeder Reactor (LWBR) (PLWBR) | 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 | 100 | 15 |
| 2 | United States | 4 | 24 | 5 |
| 3 |  Russia | 2 | 5 | 1 |
| 4 |  Belgium | 0 | 0 | 1 |
| 5 |  France | 1 | 0 | 3 |
| 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.