Method for measuring reactivity

Abstract

The invention relates to monitoring and testing of a nuclear reactor, specifically to a structure combination of a reactor core for measuring radioactivity and a sensitive instrument, and specificallyprovides a method for measuring reactivity. The reactivity of the reactor core can be evaluated without the need of putting a disturbance neutron source into the reactor core; experimental results and calculation results show that the method can evaluate the critical degree (reactivity) of the reactor by measurement of the neutron multiplication factor of an external neutron source, and providesa novel idea for measuring the reactivity of the reactor core under special working conditions.

Description

technical field [0001] The present invention relates to the monitoring and testing of nuclear reactors, in particular to the structural combination of reactor cores and sensitive instruments for measuring radioactivity, in particular a method for measuring reactivity. Background technique [0002] The conventional practice of known methods in the state of the art for assessing the criticality of reactors is to determine the multiplication factor for instantaneous neutrons based on the perturbation source method, however this requires complex dedicated measurement equipment requiring sensors with high temporal resolution and high efficiency , the corresponding need for high-precision control equipment. [0003] A known classical method for evaluating the critical state of a reactor is obtained by measuring the fission nuclear fuel in the core and the neutron multiplication factor Q of the neutron source arranged in the core. The specific calculation method of Q is the differ...

AI Technical Summary

Problems solved by technology

[0008] The inventors of the present application accidentally discovered that this classic algorithm ignores a problem that makes this simple evaluation method unusable in specific cases, that is, this method is only available when the initial parameters of the core are set and the Disturbance resources are only available if they are set inside the reactor core

However, there is a possibility that the status of the reactor from a nuclear safety point of view may not be known under certain circumstances, for example in the event of a nuclear accident the real situation inside the reactor may not be known and in It is not possible to place a disturbing neutron source inside the core under accident conditions. At this time, it is impossible to simply determine the neutron multiplication factor Q through the above-mentioned classical algorithm to evaluate the state of the reactor.

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