Ordinary leakage can be tolerated. Gas turbine may be employed. Reactor vessel and heat exchangers large and expensive. Heat transfer efficiency is low. Coolant must be pressurized.
Power density is low.
Carbon dioxide dissociates above 300 Centigrade. The Science and Engineering of Nuclear Power, Goodman. Introduction to Nuclear Engineering, Lamarsh. Thermal Hydraulics of Advanced Nuclear Reactor, Y. A. Hassan. Heat transfer and Fluid Flow in Nuclear Systems, Henri Fenech.