The world's nuclear fleet in 1963
In 1963, 38 nuclear reactors were operating in 7 countries, 2.3 GWe net, with 42 under construction.
Compared with 1962, the operating fleet grew by 5 reactors. 9 reactors were connected to the grid that year, 448 MWe, mostly in United States (5), France (1) and Italy (1). 1 unit was permanently shut down, 24 MWe. Italy and Japan connected their first nuclear reactor in 1963. The countries with the most operating capacity were United Kingdom (979 MWe), United States (927 MWe) and Russia (272 MWe).
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Connected to the grid in 1963
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Chinon A-1 |  France | GCR | UNGG | 70 |
| Latina |  Italy | GCR | Magnox | 153 |
| Japan Power Demonstration Reactor |  Japan | BWR | BWR-1 | 12 |
| Windscale AGR |  United Kingdom | GCR | AGR | 24 |
| Carolinas-Virginia Tube Reactor |  United States | PHWR | — | 17 |
| Elk River | United States | BWR | unknown | 22 |
| Hallam | United States | — | Atomics International | 75 |
| Humboldt Bay | United States | BWR | BWR-1 | 63 |
| Piqua | United States | — | Atomics International | 12 |
Shut down in 1963
| Unit | Country | Type | Model | MWe | Grid connection |
|---|---|---|---|---|---|
| Vallecitos | United States | BWR | BWR-1 | 24 | 1957 |
Countries by operating capacity in 1963
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | United Kingdom | 14 | 979 | 15 |
| 2 | United States | 14 | 927 | 5 |
| 3 |  Russia | 4 | 272 | 3 |
| 4 | France | 3 | 86 | 6 |
| 5 |  Canada | 1 | 22 | 1 |
| 6 |  Germany | 1 | 16 | 4 |
| 7 |  Belgium | 1 | 10 | — |
| 8 | Italy | 0 | 0 | 3 |
| 9 | Japan | 0 | 0 | 2 |
| 10 |  Slovakia | 0 | 0 | 1 |
| 11 |  Sweden | 0 | 0 | 1 |
| 12 |  Switzerland | 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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