India Power:First indigenous nuclear submarine’s sea trials to begin off Visakhapatnam

India will take a big step towards achieving a credible nuclear weapon triad in February when its first indigenous nuclear submarine INS Arihant begins sea trials off Visakhapatnam.

Top defence ministry sources say the "sea-acceptance trials'' (SATS) of INS Arihant are slated to begin "towards end-February'' after the completion of its ongoing harbour-acceptance trials (HATS). "It will take at least six months of extensive SATS and missile trials before the boat is ready for commissioning into Navy,'' said a source.

With INS Arihant's induction, India for the first time will brandish the most effective third leg of the nuclear triad - the ability to fire nukes from land, air and sea. The first two legs revolve around the Agni family of ballistic missiles and fighters like Sukhoi-30 MKIs and Mirage-2000 s jury-rigged to deliver nuclear warheads .

nly the Big-5 has nuclear triads till now, with a total of over 140 nuclear-powered submarines. America leads the pack with 71, followed by Russia with about 40, while China, the UK and France have around 10-12 each. India did get delivery of INS Chakra, the rechristened Akula-II nuclear-powered submarine 'K-152 Nerpa' , from Russia on a 10-year lease last week. But while it will bolster the country's underwater firepower, it's not armed with nuclear-tipped missiles due to international treatises.

India's nuclear triad will be in place, as Navy chief Admiral Nirmal Verma has declared, once INS Arihant is out at sea on "deterrent patrols'' . It has been a long journey for INS Arihant since it was "launched' ' at Vizag in July, 2009, with PM Manmohan Singh himself in attendance.

Each and every sub-system was checked and re-checked , along with high-pressure steam trials of all the pipelines, before the miniature 83 MW pressurized light-water reactor, fitted in a containment vessel on board the over 6,000-tonne INS Arihant , went "critical'' last year, said sources.

"HATS followed thereafter. Now, things are on track for SATS to begin in end-February ,'' said the source. Simultaneously , fabrication work on the three follow-on SSBNs (nuclearpowered submarines armed with nuclear ballistic missiles), dubbed S-2 , S-3 and S-4 , is in full swing under the over Rs 30,000-crore advanced technology vessel programme. The second SSBN after INS Arihant is to be named INS Aridhaman, both of which loosely mean "potent destroyer of enemies'' .

They are to be armed first with the 750-km K-15 and at a later stage with the under-development 3,500-km K-4 SLBMs (submarine-launched ballistic missiles). INS Arihant has four silos on its hump to carry either 12 K-15 s or four K-4 s.

Navy wants to have three SSBNs and six SSNs (nuclear-powered attack submarines) in the long term, as reported by TOI earlier. The force is grappling with a depleting conventional underwater arm, down to only 14 ageing diesel-electric submarines.

Nuclear-powered submarines can silently stay underwater for months at end, unlike conventional ones that have to surface every few days to get oxygen to recharge their batteries. India with a clear "no-first use'' nuclear doctrine needs survivable second-strike capability riding on SSBNs to ensure credible deterrence.


source:http://www.allcurrentaffairs.tk/2012/01/first-indigenous-nuclear-submarines-sea.html