NS Sevmorput
NS Sevmorput is a nuclear-powered cargo ship operated by Rosatomflot, powered by KLT-40 of about 135 MWt. Operating.
The only nuclear-powered merchant ship in service anywhere. A container and lighter-aboard-ship carrier that can break 1.5 metres of ice, it needed refuelling only once up to 2003. Approved for decommissioning around 2014, it was returned to service in 2015 instead.
| Reactor | KLT-40 |
|---|---|
| Reactors per vessel | 1 |
| Thermal output | 135MWt |
| Fuel enrichment | not disclosed |
| Refuelling | not disclosed |
| Category | cargo ship |
|---|---|
| Role | civil |
| Operator | Rosatomflot |
| Country | Russia |
| Vessels in class | 1 |
| In service from | 1988 |
| Status | Operating |
Other cargo ships
| Class | Enrichment | Status |
|---|---|---|
| Mutsu | - | Retired |
| NS Savannah | LEU | Retired |
| Otto Hahn | - | Retired |
NS Sevmorput in context
It is one of 4 cargo ship programs on record, 1 of them operating and 3 retired, and one of 13 naval reactor programs from the same country.
Each of its reactors is rated about 135 MWt; across the 4 cargo ship programs with a stated rating the median is 55 MWt, and this one ranks 1st.
It entered service in 1988, 38 years ago; the cargo ship programs on record entered service between 1962 and 1988, and this one is the 4th earliest of 4.
| Measure | NS Sevmorput | Median of cargo ship programs | Standing |
|---|---|---|---|
| Thermal power per reactor (MWt) | 135 | 55 | 1 of 4 |
| Entered service | 1988 | 9840985 | 4 of 4 (earliest first) |
Worked out from the entries on this site only, so a figure compares NS Sevmorput 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