What is the name of the first Atomic Submarine of India?

Question

What was "the world’s first full-scale atomic electric power plant devoted exclusively to peacetime uses," that went online in 1957?

Answer 1

I.N.S Chakra is the first Atomic Submarine of India.

It was launched as K-152 Nerpa in October 2008 and entered service with the Russian Navy in late 2009.
K-152 Nerpa named as INS Chakra II on 4 April 2012 at a ceremony in Visakhapatnam.
The INS Chakra joined the Eastern Naval Command at Visakhapatnam.