Critical feat

Print edition : September 06, 2013

The 80 MWe Pressurised Water Reactor at Kalpakkam, an August 2009 photograph. In the foreground is the pressure hull and behind it is the shield tank containing water. An identical reactor powers INS Arihant. Photo: Special Arrangement

Gursharan Kaur, wife of Prime Minister Manmohan Singh, breaks a coconut on the hull of India's first nuclear-powered submarine and names it INS Arihant in July 2009. Photo: AFP

INS Arihant’s reactor, which has gone into operation, propels India into the exclusive club of countries that are able to build nuclear-powered submarines.

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