Reactor primary loop dissolved hydrogen content determination method

Abstract

The invention discloses a reactor primary loop dissolved hydrogen content determination method. The method comprises the following steps: S1, respectively installing a flowmeter and a pressure gauge on an inlet and an outlet of a flow cell of a portable hydrogen analyzer, and calibrating; S2, connecting a portable hydrogen analyzer into a primary loop of the reactor, and connecting a gas supply steel head of the portable hydrogen analyzer with a nitrogen supply system; S3, enabling the coolant of the reactor primary loop to enter the flow cell through the inlet and return to the reactor primary loop through the outlet; S4, determining the coolant by the portable hydrogen analyzer to obtain the total content of hydrogen and helium in the coolant; and S5, subtracting the content of helium in the coolant, which is measured by a gas-liquid phase separator in advance, from the total content of hydrogen and helium to obtain the content of hydrogen in the coolant. According to the invention, online continuous measurement of the dissolved hydrogen content in the reactor primary loop coolant is realized, the accuracy, stability and sensitivity of dissolved hydrogen content measurement are improved, the radiation dose of personnel during dissolved hydrogen analysis is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of reactor water quality analysis, in particular to a method for measuring dissolved hydrogen content in a primary loop of a reactor. Background technique [0002] According to the water chemical technical specification of nuclear power plants, during the operation of pressurized water reactors, the dissolved hydrogen content in the primary circuit coolant must be controlled within a certain range. Under the power operation and cold shutdown mode, the appropriate hydrogen content can not only effectively inhibit the radiation decomposition of the water in the primary circuit, but also prevent the hydrogen embrittlement effect of the zirconium alloy of the nuclear fuel, and prevent the corrosion of the pressure boundary material of the primary circuit. Accurate measurement of dissolved hydrogen concentration in reactor primary circuit coolant is the prerequisite and necessary condition for tracking and regula...

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Problems solved by technology

[0005] The low accuracy of the traditional method is mainly reflected in the fact that the interference of the interfering gas in the primary circuit coolant on the detection of dissolved hydrogen is not considered, and there is no evaluation and compensation method for the interference of helium on the measurement results of dissolved hydrogen

[0006] The complexity of the traditional method is mainly reflected in the fact that the purge nitrogen used by the hydrogen analyzer in the traditional method comes from the cylinder of the hydrogen analyzer, which has a small volume and needs to be inflated regularly with an external high-pressure nitrogen cylinder. There are safety risks in the process; traditional methods only use pure hydrogen gas to calibrate portable hydrogen analyzers, and do not consider the impact of other gases on hydrogen measurement results. External high-pressure hydrogen cylinders must be used for pure hydrogen gas calibration, which is dangerous and complicated to operate

[0007] The waste of coolant is mainly because: when the hydrogen analyzer is used in the traditional method, the coolant sample water flowing through the reactor primary loop of the hydrogen analyzer is directly discharged to the air, and then it is discharged into the wastewater treatment system as chemical wastewater, and the primary loop is not realized. Direct recycling of coolant

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