The use of a heterophase thermionic converter reactor is suggested as a possible solution to the problem that relates to the development of a dual-mode power reactor facility. Two specialized subsystems of thermionic electricity-generating channels are applied in this thermionic convenor reactor to provide for its extended service life. The thermionic electricity-generating channels of the first subsystem are used to ensure a full power mode in a relatively short period of time, while the thermionic electricity-generating channels of the second subsystem are necessary to provide for a long service life. Under the full power mode, both subsystems of the thermionic converter reactor are connected in parallel to the total load, while in the mode of a durable power supply only the second subsystem acts as a source of electric power. The power reactor facility, based on such a thermionic converter reactor, is capable to ensure the power supply for an electro-propulsion system, with a maximum capacity of 150 kW operating up to 2 years, as well as for a spacecraft apparatus, with a capacity of 60-80 kW and a corresponding service life of 10 years or longer.
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