Solution system plutonium concentration estimation method based on neutron coincidence counting and monitoring system

Abstract

The invention relates to a solution system plutonium concentration estimation method based on neutron coincidence counting and a monitoring system. The method comprises steps of calculating correctionfactor by adopting a three-dimensional Monte Carlo program; correcting the neutron absorption effect of the point model equation set, correcting the energy spectrum difference between (alpha, n) neutrons and fission neutrons, and correcting the detection efficiency difference between induced fission neutrons and spontaneous fission neutrons, so the neutron coincidence counting calculation resultof the improved point model equation set can accurately reflect the measurement result of neutron coincidence counting of the neutron detection system outside the uranium plutonium solution system, and therefore the plutonium concentration of the uranium plutonium solution system can be accurately predicted and estimated. The method realizes non-destructive monitoring and analysis of the plutoniumconcentration of the uranium plutonium solution system, and is an advanced solution system plutonium concentration estimation method with engineering feasibility.

Description

technical field [0001] The invention belongs to the monitoring and analysis technology of fissile material content outside a reactor, and is applicable to the field of monitoring and estimating the plutonium concentration of a uranium-plutonium solution system, and specifically relates to a method for estimating the plutonium concentration of a solution system based on neutron coincidence counting. Background technique [0002] In the neutron detection process of the uranium-plutonium solution system, the total neutron count rate and the coincidence neutron count rate measured by the neutron detector can be reversed to calculate the plutonium concentration in the solution system. This method is called non-destructive Analysis (NonDestructive Assay, NDA) method, and does not require additional neutron sources. [0003] The plutonium concentration estimation algorithm mainly uses the "point model" equations derived by Boehnel (see: Shi Xueming, Liu Chengan. Application of coin...

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Problems solved by technology

This method is only suitable for analytical hot chambers or laboratories due to the need to use hybrid K boundary density meters and other equipment, and cannot be applied to online monitoring of the process flow of spent fuel reprocessing plants

[0022] In addition, there are some invention patent applications on coincidence counting (for example, coincidence counting management method and device, application number: 201811093455.7; time coincidence counting system, method and device, application number: 201811258269.4; a special pulse for neutron multiplicity measurement Signal processor, application number: 201811061104.8, etc.), these applications are only for the method of counting itself, and do not involve the monitoring and estimation method of plutonium mass / plutonium concentration

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