Borei-class submarine

Borei class SSBN profile (project 955)
K-550 Alexander Nevsky
Class overview
Name	Borei class
Builders	Sevmash, designed by Rubin
Operators	Russian Navy
Preceded by	Delta IV class, Typhoon class
Subclasses	Khabarovsk-class
Cost	US$713 million[1]
Built	1996–present
In commission	2013–present
Planned	14[3]
Building	3
Completed	8
Active	7[2]
General characteristics
Type	nuclear-powered ballistic missile submarine
Displacement	14720 t (14488 long tons) surfaced 24000 t (23621 long tons) submerged
Length	170 m (557 ft 9 in)
Beam	13.5 m (44 ft 3 in)
Draught	10 m (32 ft 10 in)
Propulsion	1 × ОК-650V nuclear reactor 1 × Steam turbine, 50000 SHP 1 × Pump-jet
Speed	Submerged: 29 knots (54 km/h; 33 mph)[7] Surfaced: 15 knots (28 km/h; 17 mph)
Range	Unlimited
Test depth	400 metres (1,300 ft)
Complement	107 total crew
Armament	16 × RSM-56 Bulava SLBMs with 6 MIRV warheads[4] (project 955 and 955A)[5][6] 8 x 533mm torpedo tubes or 6 × 533mm torpedo tubes (BOREI-A) 6 x 533mm external Special Purpose External Tubes (SPETS) REPS-324 Shlagbaum anti-torpedo defense system RPK-2 Viyuga anti-submarine/ship missiles

The Borei class, alternate transliteration Borey, Russian designation Project 955 Borei and Project 955A Borei-A (Russian: Борей, lit. 'Boreas', NATO reporting name Dolgorukiy), are a series of nuclear-powered ballistic missile submarines being constructed by Sevmash for the Russian Navy. The class has been replacing the steadily retiring Russian Navy Delta III and Delta IV classes and fully retired (as of February 2023) Typhoon, all three classes being Soviet-era submarines.

Despite being a replacement for many types of SSBNs, Borei-class submarines are much smaller than those of the Typhoon class in both displacement^[8] and crew (24000 tons submerged opposed to 48000 tons and 107 personnel as opposed to 160 for the Typhoons). In terms of class, they are more accurately a follow-on for the Delta IV-class SSBNs.