FIELD: nuclear physics.
SUBSTANCE: invention is related to methods for monitoring of nuclear reactors. Invention makes it possible to define efficient multiplication factor keff in the range from 0.95 to 0.99 without performance of preliminary experiments on measurement of efficient intensity of neutron source, Qeff. For this purpose flow of neutrons n(t) is measured, radiated by water-water powder reactor (VVER) as velocities of neutron detector count v(t) in initial stationary condition and in case of VVER power increase by reduction of boric acid concentration C(t), reduction of C(t) is measured in time with interval of discrecity of Δ = 1 second, number of neutron detector counts St is measured for the time T, efficient multiplication factor is calculated by the following formula: keff(t) = k0j + Δk(C(t)), where: k0j - efficient multiplication factor in initial stationary condition, Δk(C(t)) - dependence of efficient multiplication factor increment from concentration of boric acid. Knowing v(0) and keff(t), equations of point kinetics are used to produce sought for value of efficient multiplication factor in zero moment of time by means of simple calculations.
EFFECT: reduction of labour intensiveness of works in process of reactors operation.
4 cl, 3 dwg
