Dreadnought class
Dreadnought class is a nuclear-powered submarine operated by Royal Navy, powered by PWR3. Under construction.
The replacement for the Vanguard SSBNs. PWR3 is largely based on the US S9G design while using UK technology, a further deepening of the transatlantic reactor relationship.
| Reactor | PWR3 |
|---|---|
| Reactors per vessel | 1 |
| Thermal output | not disclosed |
| Fuel enrichment | Highly enrichedHEU |
| Refuelling | not disclosed |
| Category | submarine |
|---|---|
| Role | SSBN |
| Operator | Royal Navy |
| Country | United Kingdom |
| Vessels in class | not stated |
| In service from | - |
| Status | Under construction |
Other submarines
| Class | Enrichment | Status |
|---|---|---|
| AUKUS submarines | HEU | Planned |
| Akula class | - | Operating |
| Alfa class | HEU | Retired |
| Arihant class | HEU | Operating |
| Astute class | HEU | Operating |
| Borei class | HALEU | Operating |
| Columbia class | HEU | Under construction |
| Han class (Type 091) | - | Operating |
| Le Triomphant class | LEU | Operating |
| Los Angeles class | HEU | Operating |
| Ohio class | HEU | Operating |
| Oscar II class | - | Operating |
| Seawolf class | HEU | Operating |
| Suffren class (Barracuda) | LEU | Operating |
| Type 093 and 094 (Shang and Jin) | LEU | Operating |
| Typhoon class | - | Retired |
| USS Nautilus | HEU | Retired |
| Vanguard class | - | Operating |
| Virginia class | HEU | Operating |
| Xia class (Type 092) | - | Retired |
| Yasen class | HALEU | Operating |
Dreadnought class in context
It is one of 22 submarine programs on record, 15 of them operating and 4 retired, and one of 3 naval reactor programs from the same country.
Its fuel is recorded as HEU, the same as 10 of the other 15 submarine programs with a stated enrichment class.
Worked out from the entries on this site only, so a figure compares Dreadnought class with what is recorded here, not with everything that exists. An entry with no value for a measure is left out of that measure's ranking and median.
Sources
- World Nuclear Association, Nuclear-Powered Ships · retrieved 2026-09-07
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data