阅读说明：本技术 一种高温气冷堆堆芯参数在线监视系统 (Reactor core parameter online monitoring system of high-temperature gas cooled reactor ) 是由 姚尧 张瑞祥 武方杰 康祯 梁舒婷 叶林 于德 刘军强 叶志强 赖芳芳 许杰 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种高温气冷堆堆芯参数在线监视系统,包括压力容器、碳砖层、数据处理和监视系统、石墨砖层、堆芯、若干堆芯仪表管、若干石墨砖层仪表管及若干碳砖层仪表管；压力容器、碳砖层、石墨砖层及堆芯由外到内依次分布,堆芯仪表管的下端插入于堆芯内,石墨砖层仪表管的下端插入于石墨砖层内,碳砖层仪表管的下端插入于碳砖层内；堆芯仪表管、石墨砖层仪表管及碳砖层仪表管内均设置有若干监测仪表,监测仪表的输出端与数据处理和监视系统相连接,该系统能够对高温气冷堆堆芯参数进行在线监视。(The invention discloses a reactor core parameter online monitoring system of a high-temperature gas cooled reactor, which comprises a pressure vessel, a carbon brick layer, a data processing and monitoring system, a graphite brick layer, a reactor core, a plurality of reactor core instrument tubes, a plurality of graphite brick layer instrument tubes and a plurality of carbon brick layer instrument tubes, wherein the carbon brick layer is arranged on the pressure vessel; the pressure vessel, the carbon brick layer, the graphite brick layer and the reactor core are sequentially distributed from outside to inside, the lower end of a reactor core instrument tube is inserted into the reactor core, the lower end of the graphite brick layer instrument tube is inserted into the graphite brick layer, and the lower end of the carbon brick layer instrument tube is inserted into the carbon brick layer; the reactor core instrumentation tube, the graphite brick layer instrumentation tube and the carbon brick layer instrumentation tube are internally provided with a plurality of monitoring instruments, the output ends of the monitoring instruments are connected with a data processing and monitoring system, and the system can monitor the reactor core parameters of the high temperature gas cooled reactor on line.)

1. The reactor core parameter online monitoring system of the high-temperature gas cooled reactor is characterized by comprising a pressure vessel (1), a carbon brick layer (2), a data processing and monitoring system (10), a graphite brick layer (3), a reactor core (4), a plurality of reactor core instrument tubes (5), a plurality of graphite brick layer instrument tubes (6) and a plurality of carbon brick layer instrument tubes (7);

the pressure vessel (1), the carbon brick layer (2), the graphite brick layer (3) and the reactor core (4) are sequentially distributed from outside to inside, the lower end of a reactor core instrument tube (5) is inserted into the reactor core (4), the lower end of a graphite brick layer instrument tube (6) is inserted into the graphite brick layer (3), and the lower end of a carbon brick layer instrument tube (7) is inserted into the carbon brick layer (2); a plurality of monitoring instruments (9) are arranged in the reactor core instrument tube (5), the graphite brick layer instrument tube (6) and the carbon brick layer instrument tube (7), and the output ends of the monitoring instruments (9) are connected with a data processing and monitoring system (10).

2. The on-line monitoring system for the reactor core parameters of the high temperature gas cooled reactor according to claim 1, wherein the upper end of the reactor core instrumentation tube (5), the upper end of the graphite brick layer instrumentation tube (6) and the upper end of the carbon brick layer instrumentation tube (7) are all fixed on the top of the pressure vessel (1).

3. The reactor core parameter online monitoring system of the high temperature gas cooled reactor according to claim 1, wherein the number of the graphite brick layer instrumentation tubes (6) is eight, and the eight graphite brick layer instrumentation tubes (6) are uniformly distributed along the circumferential direction.

4. The reactor core parameter online monitoring system of the high temperature gas cooled reactor according to claim 3, wherein the number of the carbon brick layer instrumentation tubes (7) is eight, and the eight carbon brick layer instrumentation tubes (7) are uniformly distributed along the circumferential direction.

5. The reactor core parameter online monitoring system of the high temperature gas cooled reactor according to claim 4, wherein the number of the reactor core instrumentation tubes (5) is 25, one of the reactor core instrumentation tubes (5) is located at the center of the reactor core (4), and the remaining 24 reactor core instrumentation tubes (5) are equally divided into three groups, wherein each group of the reactor core instrumentation tubes (5) are sequentially distributed from inside to outside, and each reactor core instrumentation tube (5) in each group of the reactor core instrumentation tubes (5) is uniformly distributed along the circumferential direction.

6. The reactor core parameter online monitoring system of the high temperature gas cooled reactor of claim 5, further comprising a plurality of radial supports (8-1) and a plurality of circumferential supports (8-2); the reactor core instrumentation tubes (5) positioned at the center of the reactor core (4), two reactor core instrumentation tubes (5) in each group of reactor core instrumentation tubes (5), two graphite brick layer instrumentation tubes (6) and two carbon brick layer instrumentation tubes (7) are positioned on the same straight line and are connected through a radial support (8-1), the radial supports (8-1) are connected through circumferential supports (8-2), and the end parts of the radial supports (8-1) are fixed on the inner wall of the pressure vessel (1).

7. The on-line monitoring system for the reactor core parameters of the high temperature gas cooled reactor according to claim 6, wherein the reactor core instrumentation tubes (5), the graphite brick layer instrumentation tubes (6), the carbon brick layer instrumentation tubes (7), the radial supports (8-1) and the circumferential supports (8-2) are all made of zirconium-niobium alloy.

8. The reactor core parameter online monitoring system of the high temperature gas cooled reactor of claim 1, wherein the monitoring instruments (9) in the same reactor core instrumentation tube (5) are distributed in sequence from top to bottom; all monitoring instruments (9) in the same graphite brick layer instrument tube (6) are distributed from top to bottom in sequence, and all monitoring instruments (9) in the same carbon brick layer instrument tube (7) are distributed from top to bottom in sequence.

9. The on-line monitoring system for the core parameters of the high temperature gas cooled reactor according to claim 1, wherein each monitoring instrument (9) comprises a self-powered probe and a thermocouple temperature sensor, wherein the self-powered probe and the thermocouple temperature sensor are connected with the data processing and monitoring system (10).

Technical Field

The invention belongs to the field of monitoring of reactor core parameters of a high-temperature gas cooled reactor, and particularly relates to an online monitoring system for reactor core parameters of the high-temperature gas cooled reactor.

Background

In the monitoring of the current pebble-bed modular high-temperature gas cooled reactor incore instrument, the thermal and physical parameters of the reactor core are obtained by using foreign analysis and calculation software model simulation calculation, although optimization calculation of various models is carried out, the consistency between the calculation result and the actual incore parameter may still have obvious difference under a certain credibility. The calculation software of the high-temperature gas-cooled reactor is mainly from abroad, and domestic regulatory agencies lack the software used for comparison in the process of software evaluation and actual measured reactor core thermal or physical parameters as references, so that certain restrictions are generated on the development of the high-temperature gas-cooled reactor. Although the reactor power level can be calculated by the out-of-reactor neutron measuring instrument, the reactor core temperature and the neutron distribution cannot be monitored, the out-of-reactor neutron measuring instrument cannot be effectively calibrated, and the reactor core power calculated through the thermal balance can cause large unavoidable errors. The lack of monitoring of reactor core key parameters during reactor accident conditions is not beneficial to monitoring and diagnosis after high temperature gas cooled reactor accidents.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an online monitoring system for reactor core parameters of a high-temperature gas-cooled reactor, which can perform online monitoring on the reactor core parameters of the high-temperature gas-cooled reactor.

In order to achieve the aim, the reactor core parameter online monitoring system of the high-temperature gas cooled reactor comprises a pressure vessel, a carbon brick layer, a data processing and monitoring system, a graphite brick layer, a reactor core, a plurality of reactor core instrument tubes, a plurality of graphite brick layer instrument tubes and a plurality of carbon brick layer instrument tubes;

the pressure vessel, the carbon brick layer, the graphite brick layer and the reactor core are sequentially distributed from outside to inside, the lower end of a reactor core instrument tube is inserted into the reactor core, the lower end of the graphite brick layer instrument tube is inserted into the graphite brick layer, and the lower end of the carbon brick layer instrument tube is inserted into the carbon brick layer; the reactor core instrument tube, the graphite brick layer instrument tube and the carbon brick layer instrument tube are internally provided with a plurality of monitoring instruments, and the output ends of the monitoring instruments are connected with a data processing and monitoring system.

The upper ends of the reactor core instrument tubes, the graphite brick layer instrument tubes and the carbon brick layer instrument tubes are fixed at the top of the pressure vessel.

The core instrument tube, the graphite brick layer instrument tube, the carbon brick layer instrument tube, the radial support and the circumferential support are all made of zirconium-niobium alloy.

The number of the graphite brick layer instrument tubes is eight, wherein the eight graphite brick layer instrument tubes are uniformly distributed along the circumferential direction.

The number of the carbon brick layer instrument tubes is eight, and the eight carbon brick layer instrument tubes are uniformly distributed along the circumferential direction.

The number of the core instrumentation tubes is 25, wherein one core instrumentation tube is positioned at the central position of the core, and the rest 24 core instrumentation tubes are averagely divided into three groups, wherein each group of the core instrumentation tubes are sequentially distributed from inside to outside, and the core instrumentation tubes in each group of the core instrumentation tubes are uniformly distributed along the circumferential direction.

The device also comprises a plurality of radial supports and a plurality of circumferential supports; the reactor core instrumentation tubes located at the center of the reactor core, the two reactor core instrumentation tubes in each group of reactor core instrumentation tubes, the two graphite brick layer instrumentation tubes and the two carbon brick layer instrumentation tubes are located on the same straight line and are connected through a radial support, the radial supports are connected through a circumferential support, and the end parts of the radial supports are fixed on the inner wall of the pressure vessel.

All monitoring instruments in the same reactor core instrument tube are distributed in sequence from top to bottom; all the monitoring instruments in the same graphite brick layer instrument tube are sequentially distributed from top to bottom, and all the monitoring instruments in the same carbon brick layer instrument tube are sequentially distributed from top to bottom.

Each monitoring instrument comprises a self-powered detector and a thermocouple temperature sensor, wherein the self-powered detector and the thermocouple temperature sensor are connected with a data processing and monitoring system.

The invention has the following beneficial effects:

when the reactor core parameter online monitoring system of the high-temperature gas cooled reactor is in specific operation, the lower end of the reactor core instrument tube is inserted into the reactor core, the lower end of the graphite brick layer instrument tube is inserted into the graphite brick layer, the lower end of the carbon brick layer instrument tube is inserted into the carbon brick layer, and the parameters of the high-temperature gas cooled reactor are detected by the reactor core instrument tube, the graphite brick layer instrument tube and the monitoring instruments in the carbon brick layer instrument tube and then are transmitted to the data processing and monitoring system.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a distribution diagram of the monitoring meter 9;

fig. 3 is a cross-sectional view of the present invention.

Wherein, 1 is a pressure vessel, 2 is a carbon brick layer, 3 is a graphite brick layer, 4 is a reactor core, 5 is a reactor core instrument tube, 6 is a graphite brick layer instrument tube, 7 is a carbon brick layer instrument tube, 8-1 is a radial support, 8-2 is a circumferential support, 9 is a monitoring instrument, and 10 is a data processing and monitoring system.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1, 2 and 3, the reactor core parameter online monitoring system of the high temperature gas cooled reactor according to the present invention includes a pressure vessel 1, a carbon brick layer 2, a graphite brick layer 3, a reactor core 4, a reactor core instrumentation tube 5, a graphite brick layer instrumentation tube 6, a carbon brick layer instrumentation tube 7, a radial support 8-1, a circumferential support 8-2, a monitoring instrument 9 and a data processing and monitoring system 10;

the pressure vessel 1, the carbon brick layer 2, the graphite brick layer 3 and the reactor core 4 are sequentially distributed from outside to inside, the upper end of a reactor core instrument tube 5, the upper end of a graphite brick layer instrument tube 6 and the upper end of a carbon brick layer instrument tube 7 are all fixed at the top of the pressure vessel 1, the cross section size of the lower side of the reactor core 4 is gradually reduced from top to bottom, the lower end of the reactor core instrument tube 5 is inserted into the reactor core 4, the lower end of the graphite brick layer instrument tube 6 is inserted into the graphite brick layer 3, and the lower end of the carbon brick layer instrument tube 7 is inserted into the carbon brick layer 2;

the reactor core instrumentation tube 5, the graphite brick layer instrumentation tube 6, the carbon brick layer instrumentation tube 7, the radial support 8-1 and the circumferential support 8-2 are all made of zirconium-niobium alloy, have good irradiation resistance and strength, hardly shield neutrons while bearing the extrusion stress of graphite nodules, and improve the accuracy of neutron flux monitoring.

The number of the graphite brick layer instrument tubes 6 is eight, wherein the eight graphite brick layer instrument tubes 6 are uniformly distributed along the circumferential direction; the number of the carbon brick layer instrumentation tubes 7 is eight, the eight carbon brick layer instrumentation tubes 7 are uniformly distributed along the circumferential direction, the number of the reactor core instrumentation tubes 5 is 25, one reactor core instrumentation tube 5 is positioned at the central position of the reactor core 4, and the rest 24 reactor core instrumentation tubes 5 are averagely divided into three groups, wherein each group of the reactor core instrumentation tubes 5 are sequentially distributed from inside to outside, and the reactor core instrumentation tubes 5 in each group of the reactor core instrumentation tubes 5 are uniformly distributed along the circumferential direction;

the reactor core instrumentation tubes 5 positioned at the center of the reactor core 4, the two reactor core instrumentation tubes 5 in each group of the reactor core instrumentation tubes 5, the two graphite brick layer instrumentation tubes 6 and the two carbon brick layer instrumentation tubes 7 are positioned on the same straight line and are connected through a radial support 8-1, the radial supports 8-1 are connected through a circumferential support 8-2, wherein the end part of the radial support 8-1 is fixed on the inner wall of the pressure vessel 1;

a plurality of monitoring instruments 9 are arranged in the reactor core instrument tube 5, the graphite brick layer instrument tube 6 and the carbon brick layer instrument tube 7, and all the monitoring instruments 9 in the same reactor core instrument tube 5 are distributed in sequence from top to bottom; all the monitoring instruments 9 in the same graphite brick layer instrument tube 6 are distributed from top to bottom in sequence, and all the monitoring instruments 9 in the same carbon brick layer instrument tube 7 are distributed from top to bottom in sequence.

Each monitoring device 9 comprises a self-powered probe and a thermocouple temperature sensor, which are connected to a data processing and monitoring system 10.

The working process of the invention is as follows:

the neutron flux of different areas and heights of the reactor core 4, the graphite brick layer 3 and the carbon brick layer 2 is detected by the self-powered detector and then sent to the data processing and monitoring system 10 to be consulted by technical personnel in a power plant, when the power plant normally operates, the neutron flux detected by the self-powered detector can be used for monitoring parameters of the reactor core 4, calculating the power of the reactor, calibrating an out-of-reactor neutron measuring instrument, physically analyzing the reactor core 4, calculating AO/AI and calculating QPTR, and under the condition that the out-of-reactor instrument is unavailable or under the accident condition of the power plant, the functions of monitoring the power of the reactor core 4, monitoring the parameters of the reactor core 4 after the accident and the like can be provided.

Temperature values of different areas and heights of the reactor core 4, the graphite brick layer 3 and the carbon brick layer 2 are detected through the thermocouple temperature sensor and then sent to the data processing and monitoring system 10 to be consulted by technicians in a power plant, wherein the distribution of the temperature of the reactor core 4 can be used for monitoring parameters of the reactor core 4 and analyzing the thermal engineering of the reactor core 4, and under the working condition of the power plant accident, the functions of monitoring the power of the reactor core 4, monitoring the parameters of the reactor core 4 after the accident and the like can be provided.