Boron concentration meter for nuclear power station and calibration method thereof

Abstract

The invention discloses a boron concentration meter for a nuclear power station and a calibration method thereof. A detection device of the boron concentration meter is characterized in that a section of pipe on a drainage water monitoring branch is taken as a sampling pipe which serves as a sharing pipe section of a to-be-measured water monitoring branch and a calibration loop, and on-line communication of the sampling pipe and the calibration loop is realized through switching of tee branch control valves at two ends of the sharing pipe section; chemical titration as a standard, and the calibration for the boron concentration meter is finished ; and the operation is transferred to the monitoring branch after the calibration for real-time monitoring of boron concentration of primary loopwater . A measuring device adopts a linear mathematic model to establish a measurement relation in a piecewise fitting manner, so that the measurement precision is improved; and by means of an established on-line immediate calibration method, measurement drifting is eliminated, and measurement errors are corrected. The device is simple in structure, the measurement method is accurate and reliable, and the operation is easy; and by virtue of the calibration method, the insurmountable technical problem caused by enlargement of measurement errors of the boron concentration meter as time goes by is successfully solved, and accurate continuous on-line monitoring of the boron concentration of the primary loopwater is realized.

Description

technical field [0001] The invention relates to a boron concentration meter for on-line continuous monitoring of boron concentration in primary circuit water of a nuclear power plant, and a calibration method thereof. Background technique [0002] Existing pressurized water reactor nuclear power plants usually add boric acid into the primary loop water, and control the reactivity of the reactor by adjusting the control rods and boron concentration. In order to prevent the unexpected increase of reactor power due to the loss of negative reactivity caused by excessive dilution of boron concentration, each unit of a nuclear power plant needs to be equipped with a boron concentration monitoring device to ensure the safety of reactor operation, start-up and shutdown. The boron concentration detection device is the core component of the boron concentration meter. [0003] The boron concentration meter is a boron concentration detection device made by the neutron absorption method...

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Problems solved by technology

[0009] 2) The detection device of the two components needs to use heat-insulating materials and air cooling, resulting in a complex structure and an unstable measurement environment; after calibration on the simulated pipeline, disassembly and reinstallation on the real pipeline under test is critical for "calibration" Taboo, because there are systematic errors caused by machining between the simulated pipeline and the real pipeline under test, it is difficult to ensure the consistency of the state before and after calibration after disassembly and reassembly, thus affecting the effectiveness of calibration and reducing the accuracy of measurement; neutron The transfer of the source and the installation and operation next to the primary circuit pipeline are very detrimental to the radiation protection safety of the staff

Chemical titration analysis is carried out manually, and online continuous real-time monitoring cannot be realized

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