Nuclear island evaporator sodium ion sampling channel control device and concentration detection system

Abstract

The invention is applicable to a nuclear sampling system of a nuclear power plant and provides a nuclear island evaporator sodium ion sampling channel control device and concentration detection system, wherein each sampling channel is provided with an electromagnetic valve. The sampling channel control device comprises an AC-AC power module, a programmable controller, a plurality of relays which are connected with the programmable controller and are used to control the electromagnetic valve on the sampling channel and a shielding relay which is connected with the programmable controller and is used to shield the concentration measurement signal output by a sodium analyzer in a preset time after each channel is conducted. In the nuclear island evaporator sodium ion sampling channel control device provided by the invention, electromagnetic valves are arranged on the sampling channels between a plurality of evaporator and sodium analyzer and the programmable controller can be used to control the on / off state of electromagnetic valves on the sampling channels and perform sodium ion sampling; and the sampling channel control device can fit with the application of the sodium analyzer of the sampling channel control device with high fitting precision and without the integral design.

Description

technical field [0001] The invention belongs to a nuclear sampling system of a nuclear power plant, in particular to a sodium ion sampling channel control device and a concentration detection system of a nuclear island evaporator. Background technique [0002] The reactor coolant system is the main circuit of the primary circuit of the nuclear power plant. Its main function is to circulate the coolant, transfer the heat generated by nuclear fission in the core to the secondary circuit (steam power circuit) through the steam generator, and cool the core at the same time to prevent Fuel elements burned or destroyed. [0003] Although the nuclear sampling system of a nuclear power plant has no direct relationship with nuclear safety, it plays an important role in monitoring the water quality of the primary circuit, ensuring the normal operation of the primary circuit system, reducing the dose in the plant and prolonging the service life of the equipment. The nuclear sampling s...

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Problems solved by technology

[0004] The three-channel distribution controller is mainly used in the sodium ion measurement part of the nuclear sampling system. At present, the sodium meters that need to be used when measuring the sodium ion concentration of multiple evaporators in the nuclear island mostly use sampling channel control devices and sodium meters. Integrated design, such as the SCA2340-1 sodium meter produced by French CITA company, although it is easy to use, the measurement accuracy of this sodium meter cannot meet the site requirements

[0006] In the article "Application of Two Sodium Meters in Power Plants" in the journal "Heilongjiang Electric Power" Volume 24, Issue 01, Page 59, a detection system for steam sodium content in power plants is disclosed, which includes multiple sodium The ion sampling channel, the sodium meter connected with a plurality of sodium ion sampling channels, also includes a plurality of electromagnetic valves correspondingly arranged on the sodium meter and the plurality of sodium ion sampling channels. This detection system of steam sodium content also exists due to The concentration of sodium ions in the sampling channels before and after switching is different, which will cause deviations in the final measurement results

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