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Alfa class SSN.svg Alfa class submarine 2.jpg
Lira submarine (Project 705)
Class overview
Name: Lira
Operators: Soviet Navy Ensign Soviet Navy
Russian Navy Ensign Russian Navy
In commission: 1977
Planned: 8[1]
Completed: 7
Cancelled: 1
Retired: 7
General characteristics
Type: attack submarine
Displacement: 2,300 tons surfaced, 3,200 tons submerged
Length: 81.4 m (267 ft)
Beam: 9.5 m (31 ft)
Draught: 7.6 m (25 ft)
Propulsion: OK-550 or BM-40A, 155-MWt Lead-bismuth cooled fast reactor
40,000 shp (30,000 kW) steam turbine, one shaft[2]
Speed: 12 kn (14 mph; 22 km/h) surfaced, 41 knots (47 mph; 76 km/h) submerged[1][2]
Test depth: 350 m test[2]
Complement: 31 (all officers)[1][2]
Armament: Six 533-mm (21-inch) torpedo tubes (bow):
18 SET-65 or 53-65K torpedoes
20 VA-111 Shkval torpedoes
24 mines

The Soviet Union/Russian Navy Project 705 (Лира/Lira, "Lyre") was a class of hunter/killer nuclear-powered submarines. The class is also known by the NATO reporting name of Alfa. They were the fastest class of military submarines built, with only the prototype K-222 (NATO Papa class) exceeding them in submerged speed.

The Lira was a unique design among submarines. In addition to the revolutionary use of titanium for its hull, it used a powerful lead cooled fast reactor as a power source, which greatly reduced the size of the reactor compared to conventional designs, thus reducing the overall size of the submarine, and allowing for very high speeds. However, it also meant that the reactor had a short lifetime and had to be kept warm when it was not being used. As a result, the Liras were used as interceptors, mostly kept in port ready for a high-speed dash into the North Atlantic.

Description and history[edit]

Preproduction[edit]

Project 705 was first proposed in 1957 by M. G. Rusanov and the initial design work led by Rusanov began in May 1960 in Leningrad[1][2] with design task assigned to SKB-143, one of the two predecessors (the other being OKB-16) of the Malachite Central Design Bureau, which would eventually become one of the three Soviet/Russian submarine design centers, along with Rubin Design Bureau and Lazurit Central Design Bureau ("Lazurit" is the Russian word for lazurite). The project was highly innovative in order to meet demanding requirements: sufficient speed to successfully pursue any ship; the ability to avoid anti-submarine weapons and to ensure success in underwater combat; low detectability, in particular to airborne MAD arrays, and also especially to active sonars; minimal displacement; and minimal crew complement. A special titanium alloy hull would be used to create a small, low drag, 1,500 ton, six compartment[2] vessel capable of very high speeds (in excess of 40 knots (46 mph; 74 km/h)) and deep diving. The submarine would operate as an interceptor, staying in harbor or on patrol route and then racing out to reach an approaching fleet. A high-power liquid-metal-cooled nuclear plant was devised, which was kept liquid in port through external heating. Extensive automation would also greatly reduce the needed crew numbers to just 16 men. The practical problems with the design quickly became apparent and in 1963 the design team was replaced and a less radical design was proposed, increasing all main dimensions and the vessel weight by 800 tons and almost doubling the crew.

A prototype of a similar design, the Project 661 or K-162 (since 1978 K-222) cruise missile submarine (referred to by NATO as the Papa class), was built at the SEVMASH shipyard in Severodvinsk and completed in 1972. The long build time was caused by numerous design flaws and difficulties in manufacture. Extensively tested and reconfigured, she was taken out of service following a reactor accident in 1980. She reportedly had a top speed of 44.7 knots (51.4 mph; 82.8 km/h) and a claimed dive depth of 800 m. This combined with other reports created some alarm in the U.S. Navy and prompted the rapid development of the ADCAP torpedo program and the Sea Lance missile programs projects (the latter was cancelled when more definitive information about the Soviet project was known). The creation of the high-speed Spearfish torpedo by the Royal Navy was also a response to the threat posed by the reported capabilities of the Lira.

Production[edit]

Production started in 1974 as Project 705 with construction at both the Admiralty yard, Leningrad and at Sevmashpredpriyatiye (SEVMASH — Northern Machine-building Enterprise), Severodvinsk. The lead unit was a Project 705 design and all subsequent were 705K. The first vessel was commissioned in 1971.[2] Project 705 boats were intended to be experimental platforms themselves, to test all innovations and rectify their faults, that would afterwards found a new generation of submarines. This highly experimental nature mostly predetermined their future.[citation needed] In 1981, with the completion of the seventh vessel, production ended. All vessels were assigned to the Northern Fleet.

Vessels[edit]

Lira class—significant dates
# Shipyard Laid down Launched Commissioned Status
K-64 Admiralty (Sudomekh), Leningrad June 2, 1968 April 22, 1969 December 31, 1971[3] Decommissioned August 19, 1974 for scrapping[1]
K-123 SEVMASH, Severodvinsk December 22, 1967 April 4, 1976 December 12, 1977[3] Decommissioned July 31, 1996 for scrapping[1]
K-316 Admiralty (Sudomekh), Leningrad April 26, 1969 July 25, 1974 September 30, 1978[3] Decommissioned April 19, 1990 for scrapping[1]
K-432 SEVMASH, Severodvinsk November 12, 1967 November 3, 1977 December 31, 1978[3] Decommissioned April 19, 1990 for scrapping
K-373 Admiralty (Sudomekh), Leningrad June 26, 1972 April 19, 1978 December 29, 1979[3] Decommissioned April 19, 1990 for scrapping
K-493 SEVMASH, Severodvinsk January 21, 1972 September 21, 1980 September 30, 1981[3] Decommissioned April 19, 1990 for scrapping
K-463 Admiralty (Sudomekh), Leningrad June 26, 1975 March 30, 1981 December 30, 1981[3] Decommissioned April 19, 1990 for scrapping

Decommissioning[edit]

The first vessel was decommissioned in 1974 and all seven before the end of 1996. The K-123 underwent a refit between 1983 and 1992 and had her reactor compartment replaced[2] with a VM-4 pressurized water reactor. After being used for training she was officially decommissioned July 31, 1996. Decommissioning of the ships entailed the singular complication that, the reactor being cooled by liquid metals, the nuclear rods became fused with the coolant when the reactor was stopped and conventional methods for disassembling the reactor were unavailable. France's Commissariat à l'énergie atomique et aux énergies alternatives designed and donated special equipment for a dedicated dry-dock (SD-10) in Gremikha, which was used to remove and store the reactors until they could be dismantled.[4]

General characteristics[edit]

Propulsion[edit]

The power plant for the boat was a lead-bismuth cooled fast reactor. Such reactors have a number of advantages over older types:

  • Due to higher coolant temperature, their energy efficiency is up to 1.5 times higher.
  • Lifetime without refueling can be increased more easily, in part due to higher efficiency.
  • Liquid lead-bismuth systems can't cause an explosion and quickly solidify in case of a leak, greatly improving safety.
  • LCFRs are much lighter and smaller than water-cooled reactors, which was the primary factor when considering power plant choice for Lira.

Even though 1960s technology was barely sufficient to produce reliable LCFRs, which are even today considered challenging, their advantages were considered compelling. Two power plants were developed independently, BM-40A by Gidropress (Hydropress) in Leningrad and OK-550 by the OKBM design bureau in Nizhniy Novgorod, both using a eutectic lead-bismuth solution for the primary cooling stage, and both producing 155 MW of power.

Submarine noise comparison

Designed burst speed in tests was 43–45 kn (49–52 mph; 80–83 km/h) for all vessels, and speeds of 41–42 kn (47–48 mph; 76–78 km/h) could be sustained. Acceleration to top speed took one minute and reversing 180 degrees at full speed took just 40 seconds. This degree of maneuverability exceeds all other submarines and most torpedoes that were in service at the time. Indeed, during training the boats proved able to successfully evade torpedoes launched by other submarines, which required introduction of faster torpedoes such as the American ADCAP or British Spearfish. However, the price for this was a very high noise level at burst speed.[citation needed] According to U.S. Naval Intelligence, the tactical speed was similar to Sturgeon-class submarines.[6]

Propulsion was provided by the main screw with 30 MW steam turbines, and two 100 kW electric-powered screws served as an additional propulsion system for maneuvering, quieter "creeping" (low speed tactical maneuvering), and for emergency propulsion in the event of reactor, turbine, or main screw problems. Backup power systems included a 500 kW diesel generator and a set of zinc-silver batteries.

The OK-550 plant was used on Project 705, but later, on 705K, the BM-40A plant was installed due to the low reliability of the OK-550. While more reliable, BM-40A still turned out to be much more demanding in maintenance than older pressurized water reactors. The issue was that the lead/bismuth eutectic solution solidifies at 125 °C (257 °F). If it ever hardened, it would be impossible to restart the reactor, since the fuel assemblies would be frozen in the solidified coolant. Thus, whenever the reactor is shut down, the liquid coolant must be heated externally with superheated steam. Near the piers where the submarines were moored, a special facility was constructed to deliver superheated steam to the vessels' reactors when the reactors were shut down. A smaller ship was also stationed at the pier to deliver steam from her steam plant to the Lira submarines.[citation needed]

Coastal facilities were treated with much less attention than the submarines and often turned out unable to heat the submarines reactors. Consequently the plants had to be kept running even while the subs were in harbor. The facilities completely broke down early in the 1980s and since then the reactors of all operational Lira submarines were kept constantly running. While the BM-40A reactors are able to work for many years without stopping, they were not specifically designed for such treatment and any serious reactor maintenance became impossible. This led to a number of failures, including coolant leaks and one reactor broken down and frozen while at sea. However, constantly running the reactors proved better than relying on the coastal facilities. Four vessels were decommissioned due to freezing of the coolant.[citation needed]

Both the OK-550 and the BM-40A designs were single-use reactors and could not be refueled as the coolant would inevitably freeze in the process. This was compensated for by a much longer lifetime on their only load (up to 15 years), after which the reactors would be completely replaced. While such a solution could potentially decrease service times and increase reliability, it is still more expensive, and the idea of single-use reactors was unpopular in the 1970s. Furthermore, Project 705 does not have a modular design that would allow quick replacement of reactors, so such maintenance would take at least as long as refueling a normal submarine.[citation needed]

Hull[edit]

Like all Soviet nuclear submarines, Project 705 used a double hull, where the internal hull withstands the pressure and the outer one protects it and provides an optimal hydrodynamic shape. However, unlike almost all other submarines, the hulls of the Lira had variable diameters. The shape is optimized for minimal active sonar signature and minimal water resistance and, although it complicated the design, it was essential for providing required maneuverability.

Apart from the prototypes, all six Project 705 and 705K submarines were built with titanium alloy hulls, which was revolutionary in submarine design at the time due to the cost of titanium and the technologies and equipment needed to work with it.[7] The difficulties in the engineering became apparent in the first submarine that was quickly decommissioned after cracks developed in the hull. Later, metallurgy and welding technology were improved and no hull problems were experienced on subsequent vessels. American intelligence services became aware of the use of titanium alloys in the construction by retrieving metal shavings that fell from a truck as it left the St. Petersburg ship yard.[citation needed]

The internal pressure hull was separated into six watertight compartments, of which only the third (center) compartment was manned and others were accessible only for maintenance. The third compartment had reinforced spherical bulkheads that could withstand the pressure at the test depth and offered additional protection to the crew in case of attack. To further enhance survivability, the ship was equipped with an ejectable rescue capsule.[8]

The hull was designed for extreme depths, below the deep sound layer (at 1 km), but complete redesign of the plumbing and other inter-hull systems was delayed. According to some information,[5] one of the submarines was tested on depths up to 1300 meters, but submerging to such depths and returning caused permanent damage to equipment, which in a few cycles would make the vessel very unreliable. This test may have been conducted just prior to decommissioning.[citation needed]

Control system[edit]

A suite of new systems was developed for these submarines, including[citation needed]:

  • Akkord (Accord) combat information and control system, which received and processed hydroacoustic, television, radar, and navigation data from other systems, determining the location, speed, and predicted trajectory of other ships, submarines, and torpedoes. Information was displayed on control terminals, along with recommendations for operating a single submarine, both for attack and torpedo evasion, or commanding a group of submarines.
  • Sargan weapon control system controlling attack, torpedo homing, and use of countermeasures, both by human command and automatically if required.
  • Okean (Ocean) automated hydroacoustic (sonar) system that provided target data to other systems and eliminated the need for crew members working with detection equipment.
  • Sozh navigation system and Boksit (Bauxite) course control system, which integrated course, depth, trim, and speed control, for manual, automated, and programmed maneuvering.
  • Ritm (Rhythm) system controlling operation of all machinery aboard, eliminating the need for any personnel servicing reactor and other machinery, which was the main factor in reducing crew complement.
  • Alfa radiation monitoring system.
  • TV-1 television optical system for outside observation.

All the systems of the submarine were fully automated and all operations requiring human decision were performed from the control room. While such automation is common on aircraft, other military ships and submarines have multiple, separate teams performing these tasks. Crew intervention was required only for course changes or combat and no maintenance was performed at sea. Due to these systems, the combat shift of Lira submarines consisted only of eight officers stationed in the control room. While nuclear submarines typically have 120 to 160 crew members, the initially proposed crew number was 14 — all officers, except the cook. Later it was considered more practical to have additional crew aboard that could be trained to operate the new generation of submarines and the number was increased to 27 officers and four warrant officers. Also, given that most of the electronics were newly developed and failures were expected, additional crew was stationed to monitor their performance. Some reliability problems were connected with electronics, and it is possible that some accidents could have been foreseen with more mature and better developed monitoring systems. Overall performance was considered good for an experimental system.[citation needed]

The main reason behind the small crew complement and high automation was not just to allow a reduction in the size of the submarine, but rather to provide an advantage in reaction speed by replacing long chains of command with instant electronics, speeding up any action.[citation needed]

Impact[edit]

Liras, as with almost all other nuclear submarines, were never actually used in combat and did not perform any important tasks except power demonstration. However, the Soviet government still made good use of them, by exaggerating the planned number of vessels[citation needed], which were assumed to allow naval superiority to be gained by shadowing major ship groups and destroying them in case of war. The US replied by starting the ADCAP program, and the British Royal Navy the Spearfish torpedo program, to create torpedoes with the range, speed, and intelligence to reliably pursue Lira-class submarines.

The Liras were intended to be only the first of a new generation of light, fast submarines, and before their decommissioning, there was already a family of derivative designs, including Project 705D, armed with long-range 650 mm torpedoes, and the Project 705A ballistic missile variant that was intended be able to defend herself successfully against attack submarines, therefore not needing patrolled bastions. However, the main thrust of Russian/Soviet SSN development was instead focused toward the larger, quieter boats that eventually became the Akula class.[citation needed]

The technologies and solutions developed, tested, and perfected on Lira formed the foundation for future designs. The suite of submarine control systems was later used in Akula, or Project 971 attack submarines that have a crew of 50, more than Lira but still less than half as many as other attack submarines. The Akula-class submarines represent a hybrid of the Lira and Victor III classes, combining the stealth and towed sonar array of the Victor III with the automation of the Lira.[citation needed]

Project Sapphire[edit]

Project Sapphire was a covert United States military operation to retrieve 1,278 pounds (580 kg) of very highly enriched uranium fuel for Lira-class submarines from a warehouse at the Ulba Metallurgical Plant outside Ust-Kamenogorsk in far eastern Kazakhstan, where it was stored with little protection after the fall of the Soviet Union.[9] The material, known as uranium oxide-beryllium, was produced by the Ulba plant in the form of ceramic fuel rods for use by the submarines. "The Kazakh government had no idea that this material was there", Kazakh officials later told Harvard's Graham Allison, a national-security analyst.[9] In February 1994 it was uncovered by Elwood Gift, an engineer from the Y-12 plant at Oak Ridge, Tennessee, stored in quart sized steel cans in a vault about twenty feet wide and thirty feet long. Some of it was on wire shelves while others were sitting on the floor. The cans were covered with dust.[9] Word soon came that Iran had officially visited the site looking to purchase reactor fuel. Washington set up a tiger team, and on 8 October 1994 the Sapphire Team flew out of McGhee Tyson Air National Guard Base in three blacked out C-5 Galaxy cargo planes with 130 tons of equipment. It took the team six weeks, working twelve-hour shifts, six days a week, to process and can the 1,050 cans of uranium. The Sapphire Team finished recanning the uranium on 18 November 1994 at a cost of between ten and thirty million dollars (actual cost classified). The cans were loaded into 447 special fifty-five gallon drums for secure transport to the United States. Five C-5 Galaxys were dispatched from Dover Air Force Base, Delaware to retrieve the team and the uranium, but four were forced to turn back because of bad weather. Only a single C-5, carrying 30,000 pounds of supplies Tennesseans had donated for Ust-Kamenogorsk area orphanages, got through. Eventually a second C-5 arrived, and the two planes carried the uranium to Dover, from where it was transported to Oak Ridge to be blended down for reactor fuel.[9]

Alfa-class submarine in media[edit]

  • In The Hunt for Red October and its film adaption, the fictional Alfa-class submarine V.K. Konovalov, captained by Viktor Tupolev, is tasked to mock-hunt the improved Typhoon-class submarine Red October, captained by Marko Ramius, in a test of the Red October's silent drive. However, when Ramius shows his true colours as a defector, V.K. Konovalov is tasked to hunt and sink the Red October alongside the rest of the Soviet fleet. V.K. Konovalov finds Red October after she has been cleared of her crew and placed in American hands. After a fight with the Red October and USS Dallas, V.K. Konovalov is destroyed in the novel by ramming and by her own torpedo in the film.

References[edit]

  1. ^ a b c d e f g Podvodnaya lodka-istrebitel Pr.705(705K), special issue "Tayfun", Sankt Peterburg, 2002
  2. ^ a b c d e f g h i Podvodnye Lodki, Tom I, Chast 2,Yu.V. Apalkov, Sankt Peterburg, 2003, ISBN 5-8172-0072-4
  3. ^ a b c d e f g Podvodnye Lodki, Yu.V. Apalkov, Sankt Peterburg, 2002, ISBN 5-8172-0069-4
  4. ^ "'Urgent to lift dumped K-27 nuclear sub'". Barents Observer. 2012-09-25. Retrieved 2012-08-02. 
  5. ^ a b Federation of American Scientists (December 8, 1998). "Run Silent, Run Deep". Military Analysis Network. Archived from the original on 5 February 2006. Retrieved 2006-03-18. 
  6. ^ Polmar, Norman (2005). Cold War Submarines: The Design and Construction of U.S. and Soviet Submarines, 1945-2001. Potomac Books Inc. p. 319. ISBN 1-57488-530-8. 
  7. ^ Kramer, Andrew E. (July 5, 2013). "Titanium Fills Vital Role for Boeing and Russia". The New York Times. 
  8. ^ Thamm, Gerhardt (16 September 2008) [1993]. "The ALFA SSN: Challenging Paradigms, Finding New Truths, 1969–79". Studies in Intelligence 37 (3). Center for the Study of Intelligence. 
  9. ^ a b c d Rhodes, Richard (2010). The Twilight of the Bombs. New York: Alfred A. Knopf. ISBN 978-0-307-26754-2. 

Further reading[edit]

  • Preston, Antony (2002). The World's Worst Warships. London: Conway Maritime Press. ISBN 0-85177-754-6. 
  • Polmar, Norman; Moore, K. J. (2003). Cold War Submarines: The Design and Construction of U.S. and Soviet Submarines, 1945-2001. Dulles, Virginia: Potomac Books Inc. ISBN 1574885944. 

External links[edit]

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