OVERVIEW: The YASEN-M class (Project 885M) SSGN aka Graney-class aka SEVERODVINSK (NATO reporting name) is a single shaft,  nuclear-powered guided missile submarine.

DETAILS:   The YASEN-M class is a divergence from the typical Soviet and Russian practice of  building a dedicated hunter-killer submarine.  With a significant long-range land and maritime strike capability, the YASEN can threaten targets in Europe without transiting the Greenland-Iceland-UK (GIUK) gap.

The YASEN-M hull uses  low magnetic steel, and is a "one and a half hull" design, with a light hull covering only part of the submarine's pressure hull.  It is shorter than the earlier YASEN-class, likely due to a significant increase in automation, allowing for a corresponding decrease in crew size, and because of the reduced size of the KTP-6 reactor.

The propulsion plant consists of a KTP-6 monoblock reactor that uses natural water circulation for cooling.  This dispenses with a requirement to run circulation pumps, making the submarine significantly quieter than previous Russian designs, and likely only slightly noisier than the most modern USN submarines.   The Quiet Speed is reportedly 20 knots.
 
Other quieting features include likely mounting the engineering compartment on a raft, and the likely use of a skewed-7 screw.

Severodvinsk’s sensor suite consists of an Irtysh-Amfora sonar system, with a bow-mounted spherical sonar array, flank sonar arrays and a towed array for rearward detection. It has a MRK-50 Albatross (Snoop Pair) navigation/surface search radar and features a Rim Hat electronic support/countermeasures measures suite.

Armament for the submarines consists of four 53cm and four 65cm torpedo tubes capable of firing torpedoes or 3M54 Klub antiship/land attack/ASW missiles.  The YASEN also has 24-VLS tubes aft, each capable of carrying either four P-800 Oniks ramjet-powered supersonic antiship missiles or five 3M54-1 Kalibr missiles, giving the YASEN a significant long range strike or ASCM capability. Additionally, it is reported to be capable of carrying the 3M22 Zircon hypersonic anti-ship missile.  The submarines also carry six 324mm torpedo launchers as part of their countermeasures system.   The inclusion of the Banknot-M satellite communications system indicates that the class is intended for long range maritime and land strike.

Sensors include an Irtysh-Amfora spherical sonar array located on the bow, flank sonar arrays, and a towed array for backward detection and a MRK-50 Albatross (SNOOP PAIR) surface search radar. 



Specifications:

       Displacement: 8,600 tons surfaced; 13,800 tons submerged.
       Speed: 20 knots surfaced; 35 knots submerged
       Machinery: One OK-650KPM pressurized water reactor; 200 MWt turbines; 43,000 SHP
      Noise Level (est): 
       Endurance: 100 days
       Operational Depth: 1,475 ft (450m)(safe); 1,804 ft (580m)(NED)
       Maximum Depth:    2,160 ft (658m)(crush depth)			 
       Complement: 64

NOTES: IOC: 2021. 2+6 hulls.  Units in class: KAZAN (K-561); MOVOSIBIRSK (K-573); KRASNOYARSK (K571); ARKHANGELSK (K-564); PERM (K-??); ULYANOVSK (K-??); VORONEZH (K-??); VLADIVOSTOK (K-??)



 
SOURCES: "H I Sutton." H I Sutton - Covert Shores. Accessed June 6, 2023. https://www.hisutton.com/Pr885_Severodvinsk_Class.html. ;NavyLookout. "Has the Russian Submarine Threat Been Diminished by the Ukraine War?" Navy Lookout | Independent Royal Navy News and Analysis. Last modified April 11, 2023. https://www.navylookout.com/has-the-russian-submarine-threat-been-diminished-by-the-ukraine-war/. ; Pike, John. "KTP-6 Atomic Reactor, Submarine." GlobalSecurity.org. Last modified October 8, 2019. https://www.globalsecurity.org/military/world/russia/reactor-ktp-6.htm. ;"Project 885/Yasen Class/Graney/Severodvinsk SSN Проект 885 Ясень 885M Kazan Казань Nuclear Attack Submarine Russian Navy Datasheet Pictures Photos Video Specifications." Navy News Naval Defense Maritime Industry Equipment - Navy Recognition. Accessed June 6, 2023. https://navyrecognition.com/index.php/east-european-navies-vessels-ships-equipment/russian-navy-vessels-ships-equipment/submarines/149-project-885yasen-classgraneyseverodvinsk-ssn-885-qq-photos-video-specifications.html. ;
"Russia Vs. America: Who Has The World's Best Submarines?" The National Interest. Last modified January 24, 2020. https://nationalinterest.org/blog/buzz/russia-vs-america-who-has-worlds-best-submarines-82166. ; Suciu, Peter. "Yasen-M: Expert Declares It “The Best Submarine Russia Has Ever Built”." 19FortyFive. Last modified June 30, 2022. https://www.19fortyfive.com/2022/06/yasen-m-expert-declares-it-the-best-submarine-russia-has-ever-built/. ;"The Yasen-M and the Future of Russian Submarine Forces." Royal United Services Institute. Accessed June 6, 2023. https://rusi.org/explore-our-research/publications/rusi-defence-systems/yasen-m-and-future-russian-submarine-forces.