FIELD: nuclear physics.
SUBSTANCE: invention relates to the physics of nuclear reactors and can be applied for the experimentally estimated determination of the efficiency coefficient (keff) of the fast-fission of the active zones of the nuclear plant (NP); the neutron flux n(t) in the NP as a signal of the neutron detector vi(t) with the discrete interval Δt is measured before, during and after the disturbance introduction in the NP; the dependency of the signal from the time v(t) is also determined; a number of values of the fast-fission efficiency coefficient (keff0)j in the initial condition of the NP is set up within the range of approximate values of 0.9000 - 0.9990 before introduction of the disturbance and using the inversed multiplication formula and the relation of the point-source kinetics or the formula of dependency for the approximation of keff(t), (keff1)j is determined in its final condition and (keff(t))j is correspondently determined during the disturbance of the neutron flux; the estimated dependency of the detector signal vpj(t) is computed and on the basis of comparison of the measured and the estimated dependency v(t) the NP keff is determined, at that the impulse or current detector signal is used and on the basis of the average quadratic deviation criterion Δvj is determined within the time interval (t3, t2) after the introduction of the disturbance of the neutron flux the target value of keff0 as (keff0)j correspondent to the minimal Δvj value.
EFFECT: enhancement of the functional possibilities of the method due to application of the impulsive and current measuring devices channels and enhancement of the accuracy and reliability of the keff determination.
35 cl, 3 dwg
