FIELD: temperature control of working bodies, sets, instruments operating under gravitational conditions such as submarine mounted ones. SUBSTANCE: installed at inlet of motor-pump unit is chamber designed to accumulate gases that have not been dissolved in coolant. Chamber accommodates float whose contact with end surface of outlet pipe union of motor-pump unit yields signals for closing oxygen and hydrogen shutoff valves. EFFECT: enhanced reliability of system and safety of power plant as a whole. 1 dwg
