The world's nuclear fleet in 1963
In 1963, 38 nuclear reactors were operating in 7 countries, 2 GWe net, with 42 under construction. 8 of those units are not included in the net capacity because no net figure has been published for them.
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 (949 MWe), United States (918 MWe) and France (79 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 | — | Liquid Metal-cooled, Graphite-Moderated Reactor (LMGMR) (LMGMR) | 75 |
| Humboldt Bay | United States | BWR | Natural-circulation BWR (Natural cir.) | 63 |
| Piqua | United States | — | Organically Cooled and Moderated Reactor (OCM) (OCM (Organically Cooled and Moderated Reactor)) | 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 | 949 | 15 |
| 2 | United States | 14 | 918 | 5 |
| 3 | France | 3 | 79 | 6 |
| 4 |  Canada | 1 | 22 | 1 |
| 5 |  Germany | 1 | 15 | 4 |
| 6 |  Belgium | 1 | 10 | — |
| 7 |  Russia | 4 | 5 | 3 |
| 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.