Solution:CIRUS (Canada India Reactor Utility Services) reactor - It was commissioned on 10th July 1960. It was built in collaboration with Canada under the leadership of Dr. Homi Jahangir Bhabha.
Other Research Reactors in BARC (Bhabha Atomic Research Centre): APSARA-U, APSARA, ZERLINA, DHRUVA, PURNIMA-I, II and III.