THE METHOD OF DETERMINATION OF THE EFFICIENCY COEFFICIENT OF THE NUCLEAR PLANT FAST-FISSION

摘要

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 (k_eff) 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 v_i(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 (k_eff0)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 k_eff(t), (k_eff1)_j is determined in its final condition and (k_eff(t))j is correspondently determined during the disturbance of the neutron flux; the estimated dependency of the detector signal v_pj(t) is computed and on the basis of comparison of the measured and the estimated dependency v(t) the NP k_eff is determined, at that the impulse or current detector signal is used and on the basis of the average quadratic deviation criterion Δ_vj is determined within the time interval (t₃, t₂) after the introduction of the disturbance of the neutron flux the target value of k_eff0 as (k_eff0)j correspondent to the minimal Δ_vj 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 k_eff determination.;35 cl, 3 dwg