Start of Suffren Barracuda class submarine nuclear reactor by TechnicAtome and Naval Group


After the launch of the Suffren (Barracuda class) nuclear attack submarine, last 12 July 2019, in the presence of the President of the French Republic, Emmanuel Macron, a new milestone was reached with the divergence of the reactor, a prelude to its first sea acceptance tests prior to its delivery in 2020.


Start of Suffren Barracuda class submarine nuclear reactor by TechnicAtome and Naval Group 925 001 Naval Group Suffren Barracuda-class nuclear attack submarine. (Picture source Naval Group)


The divergence of the Suffren’s nuclear reactor has just been performed by the TechnicAtome and Naval Group teams on the Cherbourg site in accordance with the authorizations issued by the French Nuclear Safety Authority (Autorité de Sûreté Nucléaire - ASN) and the French Defense Procurement Agency (DGA).

Designed under the responsibility of the French Atomic Energy and Alternative Energies Agency (CEA), the nuclear reactor was built under the prime contracting of TechnicAtome, reactor designer, Naval Group being responsible for the production of the pressure equipments and the integration of the reactor on-board the Barracuda submarines.

One thousand employees from both companies are working full time in parallel on the six reactors of the Barracuda program.

Loïc Rocard, Chairman and Chief Executive Officer of TechnicAtome, declared “the first divergence of the nuclear reactor is a privileged moment for all those who contributed to make this operational and technological success possible. From the designer to the operator, and including the fitters, testers, welders and so many other trades, this is a rare moment of collective achievement, the symbol of a sector that lives up to its ambitions in the service of the French Navy”.

Hervé Guillou, Chairman and Chief Executive Officer of Naval Group: “The start-up of the nuclear reactor on-board the Suffren submarine is a new demonstration of the know-how of the French nuclear industrial sector, with TechnicAtome and Naval Group in the forefront. This success gives the country an unequaled defense tool with a high degree of industrial autonomy benefitting the sovereignty of France”.

Divergence is conducted from the Propulsion Control Station (PCS) of the Suffren. The operation consists in triggering a controlled nuclear reaction in the core for the first time. Lasting only a short time, this operation marks the beginning of the constant monitoring of the nuclear reactor by the operating teams. This operation will be continuous until the decommissioning of the submarine, planned for the 2050 decade.

The Barracuda class is the submarine of the 21st century, designed to meet the operational needs of the current and future navy. It features extensive operational capabilities and the latest technologies. More versatile, higher performing and better armed than its predecessors, the Suffren type SSN will go faster and further. It is designed to control all types of marine spaces, from the high seas to coastal areas.

Launched in 1998 by the French Defence Procurement Agency (DGA), the Barracuda program renews its Ship Subsurface Nuclear (SSN) component composed of six Rubis type SSNs commissioned at the start of the eighties. The associated development contract was notified in December 2006.

The Suffren type SSN is equipped with a nuclear propulsion system that offers a remarkable action range and discretion. It also features communication means allowing its integration within a naval force.


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