Having joined the nuclear program in 1964, Ramanna worked under Homi Jehangir Bhabha, and later became the director of this program in 1967.
Bergabung dengan program nuklir pada 1964, Ramanna bekerja di bawah bimbingan Homi Jehangir Bhabha, dan kemudian menjadi direktur program tersebut pada 1967.