Sampling device for online boron meter calibration of nuclear power plant and online boron meter calibration system

Abstract

The invention discloses a sampling device for online boron meter calibration of a nuclear power plant. The device of the invention is connected between an online boron meter and a boron meter calibration device including a calibration water tank and a power device, and comprises a sampling pipeline, a pipeline connecting member, an outlet pipeline and a return pipeline. one end of the outlet pipeline is connected to a water outlet below the calibration water tank through the power device; the other end of the outlet pipeline is connected to one end of the online boron meter; the other end of the online boron meter is connected to one end of the return pipeline; the other end of the return pipeline is connected to a first horizontal end of the pipeline connecting member; a second horizontalend of the pipeline connecting member is connected to a water inlet of the calibration water tank; a vertical end of the pipeline connecting member is connected to one end of the sampling pipeline; and the pipe orifice at the other end of the sampling pipeline is disposed above the calibration water tank. According to the invention, the sampling pipeline can continuously return water to the calibration water tank without the need of discharging spent liquor, thus guaranteeing calibration quality of the online boron meter; calibration time of the online boron meter is shortened; and the risk of radioactive contamination of personnel and equipment is reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear power plants, in particular to a sampling device and an online boron meter calibration system for nuclear power plant online boron meter calibration. Background technique [0002] Energy in nuclear power plants is obtained through self-sustaining chain nuclear fission reactions, and the power of the reactor depends on the level of neutron flux density in the core. In a pressurized water reactor nuclear power plant, one of the methods to control the power operation of the reactor is to add a neutron absorber—boric acid—in the coolant of the primary loop, and control the reactor chain reaction by adjusting the concentration of boron in the primary loop. Therefore, it is particularly important to monitor the boron concentration in the primary loop coolant in real time, and the online boron meter is the only instrument and equipment in nuclear power plants that can monitor the boron concentration in t...

AI Technical Summary

Problems solved by technology

Sampling through method 1, after opening the isolation valve V1, it needs to discharge the waste for 1min to ensure the representativeness of the sample. The waste solution needs to be discharged for about 200ml each time. The reduction of the total volume of the solution will make the measured boron concentration of the next gradient lower than the target. Gradient boron concentration causes nonlinear changes in the calibration curve of the online boron meter, thus affecting the quality of the boron meter calibration

[0007] 2. Method 1 needs to discharge waste liquid, increase sampling time and reduce calibration efficiency

[0008] Through the above workflow, it can be found that the waste needs to be discharged for 1 minute each time when sampling through the first method, 16 points need to be sampled during the calibration process of the boron meter, and 4 points need to be sampled during the verification process, and each point needs to be sampled twice, and the total waste of waste is about 2 t

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