India's atomic energy program has crossed a big hurdle, the country's most advanced and most complex nuclear reactor the Prototype Fast Breeder Reactor (PFBR) located near Chennai has finally got approval from India's atomic regulator to start loading the nuclear fuel and then to go ahead and initiate the controlled chain reaction. Recently Prime Minister Narendra Modi took stock of its progress. NDTV's Science Editor Pallava Bagla caught up with the elusive nuclear chief of India Dr A K Mohanty, to understand more about this atomic `Akshay Patra'.