Documents
France Naval Group
Triomphant class
France's fleet of ballistic-missile submarines and the sea-based leg of its independent nuclear deterrent, each carrying 16 M51 submarine-launched ballistic missiles. Four boats form the class, with continuous at-sea deterrence patrols maintained since the first entered service.
In service since 1997 · 1 operator countries
Compiled from public sources ·primary reference ↗ ·last verified 2026-07-02
400
m depth
25
kn
12,640
t
111
crew
Pricing: Unit cost not publicly disclosed
Procurement snapshot
Availability & export
French export-licensed
CIEEMG inter-ministerial approval; broadly export-oriented.
Channel: DGA / direct commercial
Fielded & proven
Limited · 1 operator
In service since 1997. Status: active · ~4 built.
Lifecycle cost (est.)
No public unit price to model from. Why so few systems publish one →
Interoperability
Derived guidance from public data, export regime by country of origin, lifecycle from the GAO ~30% acquisition rule. Verify eligibility, pricing and offsets with the manufacturer and your acquisition authority.
Compatible munitions & weapons
Publicly reported weapons the Triomphant class can carry. Linked items have a full spec page.
Full specifications
Firepower
Armament, payload and guidance.
| VLS cells Vertical-launch missile cells on a warship, a proxy for magazine depth. Higher means more missiles before rearming. | 16 |
|---|---|
| Torpedo tubes Number of torpedo tubes (submarines and some surface ships). | 4 |
Physical
Dimensions, weight and crew.
| Length Overall length including gun/probe where applicable. | 138 m |
|---|
Propulsion
Engine, power and fuel.
| Engine Powerplant model and type. | 1x K15 pressurised water reactor (150 MWth) with turbo-reduction pump-to-shaft drive, 2x SEMT Pielstick 8PA4V200 SM emergency diesel generators |
|---|---|
| Engine power Engine output power. Higher moves more weight faster. | 40,927 hp |
| Propulsion type Turbofan, turboshaft, diesel, gas turbine, solid-fuel rocket, ramjet… | Nuclear (pressurised water reactor) |
Sensors & avionics
Radar, sensor suite and datalinks.
| Radar Primary radar. AESA (active electronically scanned array) is the current state of the art. | Racal Decca navigation radar |
|---|---|
| Sensors IRST, EO/IR turrets, laser designators, sniper pods, thermal sights. | DMUX 80 sonar, DUUX 5 sonar, DSUV 61B very-low-frequency towed sonar, SET tactical operations system, ARUR 13 electronic support measures |
Program
Cost, production scale and operators.
| Units built Total production run. Higher means proven manufacturing, mature logistics and spares availability. | 4 |
|---|---|
| Operator countries Number of countries operating the system. More operators means broader support ecosystem. | 1 |
Specifications compiled from public Naval Group and reference sources ↗. Published defense figures are approximations, treat comparisons as directional. Last verified 2026-07-02.
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BAE Systems Astute class Frequently asked questions
What engine does the Naval Group Triomphant class use? +
The Naval Group Triomphant class is powered by the 1x K15 pressurised water reactor (150 MWth) with turbo-reduction pump-to-shaft drive, 2x SEMT Pielstick 8PA4V200 SM emergency diesel generators.
What is the Naval Group Triomphant class used for? +
The Naval Group Triomphant class is a submarine typically used for deep strike.
How many countries operate the Naval Group Triomphant class? +
The Naval Group Triomphant class is operated by 1 countries.
How much does the Naval Group Triomphant class cost? +
Naval Group Triomphant class: Unit cost not publicly disclosed. Defense program costs are rarely fully public and vary by contract and configuration.
