Arihant-class submarine

The Arihant class (Sanskrit, for Slayer of Enemies) is a class of nuclear-powered ballistic missile submarines being built for the Indian Navy. They were developed under the ₹90,000 crore (US$13 billion) Advanced Technology Vessel (ATV) project to design and build nuclear-powered submarines.[2] The vessels are classified as Strategic Strike Nuclear Submarines by India.[10][11]

INS Arihant, lead vessel of the class
Class overview
Name: Arihant
Builders: Navy Shipbuilding Centre, Visakhapatnam[1]
Operators:  Indian Navy
Succeeded by: S5-class submarine
Cost: ₹4,000 crore (US$560 million) per submarine[2]
In commission: 2016-Present
Planned: 4
Building: 3[3]
Active: 1[4]
General characteristics
Type: Nuclear powered ballistic missile submarine
Displacement:
  • Arihant & Arighat: 6,000 tonnes (5,900 long tons; 6,600 short tons) surfaced[5]
  • S4 & S4*: 7,000 tonnes (6,900 long tons; 7,700 short tons)[6]
Length: 111 m (364 ft)[7]
Beam: 11 m (36 ft)[7]
Draft: 15 m (49 ft)[7]
Propulsion:
  • 1 x pressurised water reactor[8] (83 MW)
  • 1 × shaft
Speed:
  • Surfaced: 12–15 knots (22–28 km/h)
  • Submerged: 24 knots (44 km/h)
Range: Unlimited except by food supplies
Test depth: 300 m (980 ft)
Complement: 95
Sensors and
processing systems:		 USHUS sonar
Armament:
  • Arihant & Arighat: 12 × K15 SLBM (750 km or 470 mi range) or 4 × K-4 SLBM (3,500 km or 2,200 mi range)[8][6]
  • S4 & S4*: 24 × K15 SLBM (750 km or 470 mi range) or 8 × K-4 SLBM (3,500 km or 2,200 mi range)[6]
  • 6 × 21" (533 mm) torpedo tubes – est 30 charges (torpedoes, cruise missiles or mines)[9]

The lead vessel of the class, INS Arihant was launched in 2009 and after extensive sea trials, was confirmed to be commissioned in August 2016.[12][13][14] Arihant is the first ballistic missile submarine to have been built by a country other than one of the five permanent members of the United Nations Security Council.[15]

History

In December 1971, during the Indo-Pakistani War of 1971, the US President Richard Nixon sent a carrier battle group named Task Force 74, led by the nuclear-powered USS Enterprise into the international waters of the Bay of Bengal in a show of force.[16][17] Task Force 74 remained in international waters, where it was legally entitled to be. The records of Nixon-Kissinger communications show no contingency nor any plan under which Enterprise would enter Indian or Pakistani waters, or otherwise intervene in the conflict. In response, the Soviet Union sent a submarine armed with nuclear missiles from Vladivostok to trail the US task force.[18] The event demonstrated the significance of nuclear weapons and ballistic missile submarines to then Prime Minister Indira Gandhi.[19] Following the 1974 Smiling Buddha nuclear test, the Director of Marine Engineering (DME) at Naval Headquarters initiated a technical feasibility study for an indigenous nuclear propulsion system (Project 932).[20]

The Indian Navy's Advanced Technology Vessel project to design and construct a nuclear submarine took shape in the 1990s.[21] Then Defence Minister George Fernandes confirmed the project in 1998.[22] The initial intent of the project was to design nuclear-powered fast attack submarines, though following nuclear tests conducted by India in 1998 at Pokhran Test Range and the Indian pledge of no first use, the project was re-aligned towards the design of a ballistic missile submarine in order to complete India's nuclear triad.[23][24][25]

Description

The Arihant-class submarines are nuclear powered ballistic missile submarines built under the Advanced Technology Vessel (ATV) project.[26][27][28][29][30][31] They will be the first nuclear submarines designed and built by India.[32] The submarines are 111 m (364 ft) long with a beam of 11 m (36 ft), a draught of 15 m (49 ft), displacement of 6,000 tonnes (5,900 long tons; 6,600 short tons).[7] The complement is about 95, including officers and sailors.[33] The boats are powered by a single seven blade propeller powered by an 83 MW pressurised water reactor and can achieve a maximum speed of 12–15 knots (22–28 km/h) when surfaced and 24 knots (44 km/h) when submerged.[33]

Sagarika SLBM

The submarines have four launch tubes in their hump and can carry up to twelve K-15 Sagarika missiles with one warhead each (with a range of 750 km or 470 mi) or four K-4 missiles (with a range of 3,500 km or 2,200 mi).[34][35] The third and fourth submarines will have a larger configuration, carrying twenty-four K-15 Sagarika or eight K-4 missiles.[6] The Indian Navy will train on INS Chakra, an Akula-class submarine leased from Russia in 2012.[36][37]

Development

The submarines are powered by a pressurised water reactor with highly enriched uranium fuel.[38][39] The miniaturized version of the reactor was designed and built by the Bhabha Atomic Research Centre (BARC) at the Indira Gandhi Centre for Atomic Research (IGCAR) in Kalpakkam.[40] It included a 42-metre (138 ft) section of the submarine's pressure hull containing the shielding tank with water and the reactor, a control room, as well as an auxiliary control room for monitoring safety parameters.[41] The prototype reactor became critical on 11 November 2003 and was declared operational on 22 September 2006.[19] Successful operation of the prototype for three years enabled the production version of the reactor for Arihant.[42][43] The reactor subsystems were tested at the Machinery Test Center in Visakhapatnam.[44] Facilities for loading and replacing the fuel cores of the naval reactors in berthed submarines were also established.[19] The prototype 83 MW light water reactor that was installed at Kalpakkam by BARC is codenamed S1 and is used to train nuclear submariners.[6]

In 2007, then finance minister P. Chidambaram, who was a member of the political committee which monitors the ATV programme, questioned the huge amount of money being spent on submarines with just 4 missile launch tubes. Hence the ATV project team tweaked the Arihant design by adding a 10-metre-long section for four more K-4 SLBMs to be integrated into the boat codenamed S4. After it became evident that the larger S5 class of SSBNs will take more time to develop, an additional unit, codenamed S4*, was sanctioned in 2012 to ensure that the production line doesn't go idle.[6]

The detailed engineering of the design was implemented at Larsen & Toubro's submarine design centre at their Hazira shipbuilding facility.[45] Tata Power SED built the control systems for the submarine.[46] The steam turbines and associated systems integrated with the reactor were supplied by Walchandnagar Industries.[47] The lead vessel underwent a long and extensive process of testing after its launch in July 2009.[48] The propulsion and power systems were tested with high-pressure steam trials followed by harbor-acceptance trials that included submersion tests by flooding its ballast tanks and controlled dives to limited depths.[49] INS Arihant's reactor went critical for the first time on 10 August 2013.[50] On 13 December 2014, the submarine set off for its extensive sea trials.[51][52]

Ships in class
Conceptual drawing of INS Arihant

Four boats of this class are planned.[6] The first boat of[8] the class, INS Arihant, was commissioned in August 2016.[12][53] The first four vessels are expected to be commissioned by 2023. In December 2014, the work on a second nuclear reactor began and the second boat, INS Arighat is being prepared for sea trials.[2] The final two ships S4 and S4* in the class will be larger displacing over 1,000 tonnes more than the Arihant[6] and have 8 missile launch tubes to carry up to 8 K4 and a more powerful pressurized water reactor than INS Arihant.[6]

A larger follow on class to the Arihant class, designated by the codename S5, is also planned.[6] Three boats of this class are planned to be built.[6] These new boats will be capable of carrying 12 to 16 long range ballistic missiles.[54][55]

Name Pennant Displacement Laid down Launch Sea Trials Commission Status
INS Arihant(S2)[6][56] SSBN 80[57] 6,000 tonnes 2004[58] 26 July 2009 13 December 2014[59] August 2016 In service[13]
INS Arighat(S3)[6][60] 6,000 tonnes 2009[58] 19 November 2017[61][62] 2020 (est.)[2][63] Sea Trial[6]
S4 (codename)[55] 7,000 tonnes 2020 (est.)[61] 2022 (est.)[63] Under construction[64]
S4* (codename)[55] 7,000 tonnes 2021 (est.) 2023 (est.) [63] Under construction

Timeline
Date Event
19 May 1998Confirmation of ATV project by the then Defence Minister George Fernandes
11 November 2003Prototype nuclear reactor becomes critical
22 September 2006Nuclear reactor is declared operational
2007 Design of S4 is modified to allow four more launch tubes.[6]
26 July 2009Lead vessel of the class, INS Arihant, is formally launched
2012 Additional unit S4* is cleared to avoid idling of production line.[6]
10 August 2013Arihant's on-board nuclear reactor attains criticality
13 December 2014INS Arihant begins extensive sea & weapons trials
25 November 2015INS Arihant successfully test-fired dummy B5 missile
31 March 2016INS Arihant successfully test-fired K4 missile
August 2016INS Arihant commissioned.[12]
19 November 2017 INS Arighat launched[2]
Early 2018 INS Arighat to begin sea trials[65]
2019INS Arighat to be delivered.[12][65]
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See also

References
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