CIRUS was built in the late fifties with Canadian and attained its first on July 10,1960, It is a thermal neutron rector fuelled with metallic natural uranium and has a vertical reactor vessel made of cylindrical aluminum tank. Heavy water is used as moderator and graphite as a rated thermal power of 40 MW. Heat produced in the fuel is removed by de-minerlised light water circulated in a closed loop. The light water primary coolant, in turn, is cooled by sea water in once through mode. Utilisation of CIRUS, both in terms of quantity, has been of a very high standard. The reactor performed well for more than three decades with availability factor over 70 percent.
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