FIELD: thermionic power converters. SUBSTANCE: when testing electricity generating channel in reactor, measurements are made of heat release (Q) in fuel-emitter assembly and heat release (q) of fuel condensate discharged through ventilation system and condensed beyond fuel-emitter assembly; speed τ = τi is determined using these dependences for time moment of interest and fuel discharge speed (m) is found from expression dQ/dτ и dq/dτ, where 
is initial mass of fuel in fuel-emitter assembly. EFFECT: improved measurement accuracy. 2 dwg
