(opex360, jul.05)
If we are regularly informed of the progress of studies relating to the new generation aircraft carrier [PANG], the situation is different for the SNLE 3G program [third-generation ballistic missile nuclear submarine], essential for the future of French deterrence. Since, in February 2021, the Ministry of the Armed Forces entrusted the project management of its realization to Naval Group and TechnicAtome, few details have leaked out about it.
However, on July 4, via Twitter, the Directorate General of Armaments [DGA] released images of a representative model of the profile that the four SSBN 3Gs of the Strategic Oceanic Force [FOST] will have. This was used for tests at Lac de Bédane by the DGA Hydrodynamic Techniques center of expertise, in order to assess the “maneuvering performance during gyrations” of these future submarines at sea.
Compared to a 2G SSBN of the "Le Triomphant" class, the 3G SSBN will visibly have a more "stocky" kiosk [or massive], a priori equipped with a modular mast system that is not penetrating but devoid of diving bars [or fins], like that of the nuclear attack submarine [SNA] Suffren. Which suggests that these will be moved to the front of the ship.
Even if the image is fleeting, and like the Suffren, the steering gear of the SSBN 3G will consist of four bars forming a Cross of Saint Andrew [or an X], which will guarantee better maneuverability. The SNAs of the Suffren class are equipped with a similar device.
4e882c51e5c500b%7Ctwcon%5Es1_&ref_url=https%3A%2F%2Fwww.opex360.com%2F2023% 2F07%2F05%2Fthe-direction-generale-de-larme-gives-a-first-insight-of-the-nuclear-submarine-missile-launcher-3g%2F
According to the few details previously given by the Ministry of the Armed Forces, we know that the SNLE 3G will display a displacement of 15,000 tonnes in dives for a length of 150 meters and that it will be able to carry up to 16 ballistic missiles. sea-ground M51. Clearly, its dimensions will be more or less similar to those of the current SSBNs, which will not require carrying out heavy infrastructure work at the Île-Longue naval base.
In addition, the SSBN 3G will have improved acoustic discretion, thanks to a "masking coating glued to its entire hull to reduce the noise radiated into the water", this being supposed to defeat passive sonars . It will also feature “innovative magnetic discretion in the face of the airborne threat”, a new on-board atmosphere treatment plant [which, by the way, will help improve its discretion] and sensors with increased performance.
As for its propulsion, it will be based on a nuclear boiler which, according to TechnicAtome, will benefit from a “certain number of significant innovations” compared to that of the SNAs of the Suffren class. And these will be "designed to be on board" on the K22 type boiler rooms intended for the new generation aircraft carrier.
"The first 3G SSBN will replace Le Triomphant by 2035", the "cutting of the first sheet [being] planned for the end of 2023", indicated Admiral Pierre Vandier, the Chief of Staff of the French Navy [ CEMM], during a parliamentary hearing dedicated to nuclear deterrence. “The names of the four future SSBNs have not yet been defined. They will soon be proposed to the Minister and the Head of State. Their entry into active service will be staggered until 2050,” he also specified. /deepl