Method for measuring effective share of delayed neutrons

Abstract

The invention relates to a method for measuring the effective share of delayed neutrons. According to the method, an improved source multiplication method is combined with a known experimental measurement subcritical reactivity method to measure the effective share beta eff of the delayed neutrons. Namely, the improved source multiplication method is used for giving out the subcritical reactivity rho of a reactor, then the known experimental measurement subcritical reactivity method is used for giving out reactivity using the beta eff as a unit such as a source jerk method and a rod drop method, and the effective share beta eff of the delayed neutrons can be obtained by comparing the two methods. The measuring method does not need any special equipment and condition, and can be carried out in a subcritical extrapolation experiment of the reactor, so that the method is simple; and moreover, the reactivity obtained by the method does not depend on theoretical calculation like before, and can be measured in the physical starting process of the reactor.

Description

technical field [0001] The invention belongs to the field of measurement, and in particular relates to a method for measuring the effective fraction of delayed neutrons. Background technique [0002] effective fraction of delayed neutrons β eff It is the main dynamic parameter of reactor neutronics. Other dynamic parameters of reactor neutronics including average neutron lifetime l, neutron generation time Λ, reactivity ρ, etc. are all related to the effective share of delayed neutrons. If the prompt neutron decay constant is measured If the effective fraction of delayed neutrons is known, then the average neutron lifetime l is known; if the prompt neutron decay constant at the delayed critical time is measured Then the average neutron generation time Λ is also known, and under the subcritical condition, the experimentally measured reactor subcriticality or control rod value is given in terms of β eff unit reactivity If the theoretically calculated reactivity is to be...

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Problems solved by technology

β eff Technique, experimental measurement of β by heterogeneous poisoning method eff Technology, substitution method to measure β eff Technique, statistical weighting method to measure beta eff Technique, variance mean ratio measure beta eff Technical, zero-probability method for measuring beta eff technology, 252 Cf source value method to measure beta eff Technique, experimental measurement of reactivity and correction of k eff Calculation of reactivity to determine β eff And the statistical method in the frequency domain, etc., these measurement techniques are based on many theories, the experimental equipment is complicated, the measurement is troublesome and time-consuming, and the measurement error is about 5%.

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