INS Arihant -first nuclear submarine of ATV Project started in 1974

The 'Arihant' India's first indigenous nuclear submarine was launched on July 26, 2009, and after 4 years the reactor reached Criticality in August 2013. ( What is Criticality?)

• Type - Nuclear Submarine.
• It will however take another two years of trials for the 6,000-tonne submarine to finally become operational and ready to be deployed.
• Once operational, the submarine will provide India the third leg of its nuclear triad — the capacity to fire nuclear weapons from land, sea and air. The army has nuclear capable Agni and Prithvi-II missiles in its arsenal and the air force has aircraft capable of delivering nuclear warheads.
• With this, India becomes the sixth nation in the world to have the capability to design and construct a nuclear submarine and the only country in the Indian Ocean region to have a nuclear submarine.
• Its design is based on the Russian Akula-1 class submarines.
• Reactor type: The Arihant's 83Mw pressurised water reactor has also been built with considerable assistance from the Russians
• INS Arihant, India's first nuclear-powered ballistic missile submarine, which went "critical" over the weekend, has enabled India to join a select club of nations like the United States, Russia, China, the United Kingdom and France, which possess nuclear-powered submarines.
• INS Arihant is to be the first of the expected five in the class of submarines designed and constructed as a part of the Indian Navy's secretive Advanced Technology Vessel (ATV) project -1974
• It could use missiles of cruise of average reach (1,000 km), ballistic missiles of short reach (300 km), torpedoes and mines, besides participating of operatios special.

Topics To Be Read	The vessel displaces 65000 tonnes and can stay under water upto 100 days. Armed with guided missiles, it can carry a crew of 70 people. Nuclear machinery:One pressurized water reactor (PWR) using 20% enriched uranium fuel (160-190MW); one turbine (47,000hp/70MW); one shaft; one 7-bladed, high-skew propeller.
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• The submarine will have VLS tubes capable of firing multiple weapons.
• Speed (Knots) 12-15 (surfaced) 30-34 (submerged)
• Range Unlimited. Diving Depth 300 m (984.2ft).
• Weapons Torpedoes: Six 21 inch (533mm) torpedo tubes. Mines. A total capacity (mines, torpedoes, and missiles) of 30 weapons.

INS Varsha to arrive soon:

India is now said to be constructing a nuclear submarine base on its eastern coast that will be named INS Varsha, for which Rs 160 crore is sanctioned in the 2011-12 budget.

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