An online boron concentration monitoring device
A monitoring device and boron concentration technology, which is applied in nuclear reactor monitoring, reactor, nuclear power generation, etc., can solve the problems of reduced reliability of measurement results, poor absorption effect, and difficulty in keeping the temperature of the detector constant.
Active Publication Date: 2017-02-22
武汉海王核能装备工程有限公司
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Problems solved by technology
[0005] The disadvantage of the patent request with application number 201010263543.4 is that the device is improved from an off-line monitoring device and retains a complicated calibration device and scattered electronic equipment. The pulse pre-amplification of the device greatly reduces the electronic signal-to-noise ratio, which brings inconvenience to equipment maintenance and stable operation
[0006] The disadvantage of the patent request with application number 97197158.7 is that the device is positioned on the very high-temperature primary circuit main pipeline, and the operating temperature reaches several hundred degrees Celsius. It is necessary to set up a special cooling device to cool down the electronic equipment (mainly neutron detectors). The cooling medium is greatly affected by the ambient temperature, so it is difficult to ensure that the temperature of the detector remains constant, which reduces the reliability of the measurement results
In addition, the periphery of the pipeline of the detection device is made of polyethylene material, and only a layer of cadmium plate is installed on the outermost layer to absorb thermal neutrons. Polyethylene material can only moderate neutrons, and the absorption effect is very poor. Therefore, a large amount of neutrons needs to be Only after being slowed down to thermal neutrons can it be absorbed by the outermost cadmium plate
In order to achieve acceptable radiation levels for personnel, it is necessary to set up a very thick moderator layer, which makes the equipment bulky and makes it very difficult to install and disassemble in the reactor building with complex pipelines
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[0017] The measurement principle and technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0018] Such as figure 1 As shown, it is a radial cross-sectional schematic view of an embodiment of the online boron concentration monitoring device of the present invention, such as figure 2 Shown is a schematic diagram of the axial section of this embodiment. Wherein, the neutron source 12 is located directly above the primary circuit pipeline 15, with a gap between the pipeline, and the neutron detector 17 is located directly below the primary circuit pipeline 15, with a heat insulating cavity 7 between the pipeline for Fill with insulation. The insulating material may be rock wool, glass fiber or slag wool. A thermal neutron-absorbing cadmium plate 9 is arranged around the lower half of the neutron detector 17 to absorb neutrons scattered to the counter tube in the polyethylene moderator layer ...
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The invention belongs to on-line monitoring devices for nuclear power plants, and provides a device for continuously monitoring the boron concentration on line in a circuit of a pressurized water reactor of a power station. The device comprises a neutron source, an assembly for mounting the neutron source, a neutron detector, and a shield arranged around the neutron source, wherein the neutron source is arranged on a circuit pipeline; the neutron detector is arranged under the circuit pipeline; a calibrated orifice of which the pipe diameter is the same as that of the neutron detector is formed above the neutron source; the shield arranged around the neutron source comprises an inner polyethylene slowing-down layer and an outer boron-doping polyethylene layer. The device is high in integration level, compact in structure, convenient to detach, capable of self-calibration, and high in measuring response speed, makes up for use deficiencies of a conventional off-line boron concentration monitoring device and a conventional on-line boron concentration monitoring device, prolongs the response time of the boron concentration monitoring device, simplifies the periodic calibration process, meanwhile, reduces the size, and improves the signal to noise ratio of a signal processing device.
Description
technical field [0001] The invention belongs to an on-line monitoring device for a nuclear power plant, in particular to a device for continuously on-line monitoring the boron concentration in a primary circuit of a pressurized water reactor of a nuclear power plant. Background technique [0002] The control of the reactor power of the pressurized water reactor nuclear power plant is realized by adjusting the control rod and boron concentration. Since the reactor power changes significantly when the control rod is adjusted, when the reactor is running smoothly, it is mainly by adding a certain concentration of boric acid solution to the primary circuit. to regulate the power of the reactor. On the one hand, during the start-up, operation or power adjustment of the reactor, boric acid or diluted boric acid needs to be added to the cooling water of the reactor primary circuit to realize the compensation control of the reactor reactivity, so as to flatten the reactor power and ...
Claims
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IPC IPC(8): G21C17/022
CPCG21C17/022Y02E30/30
Inventor孙光智裴煜许浒代传波付晨雨徐耀伟金帆张磊李泽良
Owner武汉海王核能装备工程有限公司