FIELD: engines and pumps.
SUBSTANCE: invention can be used when operating nuclear reactors and critical assemblies (nuclear plant (NP)). There proposed is the method of determining reactivity ρ(t), at which the flow of neutrons n(t) radiated with NP is measured as the count rate of neutron detectors and ρ(t) of NP is calculated. At that, increase of reactivity is performed in cycles as per "step-pause" type. Values of the current time of the cycle pause are measured. By setting a number of values of effective K-factor keff within 0.95 to 0.99, by using point-wise kinetics equations, as per the measurement results there calculated are values of effective intensity of neutron source Qeff. Then ρ(t) functions values are calculated, and the value at which reactivity values classified by time period of each pause have minimum deviation as to absolute value from constant reactivity value ρ during that pause is taken as the desired value of a number of running values. Reactivity increase is performed for example by changing the position of NP control rods.
EFFECT: decreasing labour input of determining NP reactivity in order to ensure nuclear safety.
5 cl, 7 dwg
