Reactor core instrument assembly

Abstract

The utility model discloses a reactor core instrument assembly which comprises an electric appliance connector and an outer protective shell arranged at the front end of the electric appliance connector, a neutron detector supporting rod is arranged in the outer protective shell, and an inner protective tube is sleeved with the neutron detector supporting rod as the center. A neutron detector is arranged in the inner protection tube with the neutron detector supporting rod as the center, a temperature thermocouple is arranged at the front end of the neutron detector supporting rod in the outer protection shell, and an axial notch is formed in the inner protection tube. Brazing fixing blocks are distributed on the axial notch in the axial direction of the inner protection pipe at intervals, and a liquid level thermocouple and an electric heater are arranged on the brazing fixing blocks and fixed in the inner wall of the outer protection shell through the brazing fixing blocks. According to the utility model, the functions of reactor core neutron detection, multi-point temperature measurement and liquid level measurement are integrated, and the problem that the interfaces of the existing reactor core nuclear measurement instrument are dispersed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant reactor core temperature measuring equipment, in particular to a core instrument component. Background Art

[0002] Core nuclear measuring instruments (also called core measuring devices) refer to important nuclear-grade instrumentation and control systems of nuclear power plants, which are composed of neutron flux measurement, temperature measurement and reactor pressure vessel water level measurement subsystems. Whether from the perspective of early procurement, mid-term commissioning and use, or later maintenance, foreign manufacturers' products have high costs and long delivery cycles. In order to further improve the localization rate of core nuclear measuring instruments, it is necessary to carry out independent research and development of core nuclear measuring instruments. Therefore, it is very necessary to develop core nuclear measuring instrument products that meet the application requirements of nuclear power plants based on core nuclear measuring instruments. Utility Model Content

[0003] 1. Technical issues that need to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a core instrument assembly, which integrates core neutron detection, multi-point temperature measurement and liquid level measurement functions, solves the problem of scattered interfaces of existing core nuclear measurement instruments, and provides important support for subsequent upgrades and renovations of core instrument systems in VVER reactor-type nuclear power plants and localization substitution and supply of core instrument casing assemblies.

[0005] 2. Technical solutions that need to be adopted

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A core instrument assembly comprises an electrical connector and an outer protective shell at the front end of the electrical connector, a neutron detector support rod is arranged inside the outer protective shell, an inner protective tube is sleeved with the neutron detector support rod as the center, the outer protective shell and the inner protective tube are coaxially distributed, a neutron detector is arranged inside the inner protective tube with the neutron detector support rod as the center, a temperature measuring thermocouple is arranged at the front end of the neutron detector support rod inside the outer protective shell, and an axial notch is arranged on the inner protective tube, and brazing fixing blocks are arranged on the axial notch at intervals along the axial direction of the inner protective tube, a liquid level thermocouple and an electric heater are arranged on the brazing fixing block, the liquid level thermocouple and the electric heater are fixed to the inner wall of the outer protective shell by the brazing fixing block, the liquid level thermocouple is distributed on both sides of the electric heater, and the neutron detector is connected to the neutron detector support rod.

[0008] Preferably, a heat preservation cover is provided inside the electrical connector, and cold-end compensation thermal resistors and thermocouple cold-end connection points parallel to each other are axially distributed inside the heat preservation cover.

[0009] Preferably, sealants are provided at both ends of the heat-insulating cover.

[0010] Preferably, a heat insulation layer is provided on the outer surface of the heat preservation cover.

[0011] Preferably, insulating powder is provided inside the heat-insulating cover.

[0012] Preferably, the neutron detectors are distributed axially along the neutron detector support rod, and each of the neutron detectors is connected to the neutron detector support rod.

[0013] Preferably, the electrical connector comprises an outer tube and an outer jacket arranged inside the outer tube, copper wire and heating wire elements are arranged inside the outer jacket, and dry nitrogen is contained in the outer tube.

[0014] Preferably, the outer tube is made of a stainless steel tube, and the outer jacket is made of a magnesium oxide column.

[0015] Preferably, the core wire of the neutron detector signal line in the neutron detector support rod adopts a twisted-pair structure.

[0016] 3. Technical effects to be achieved

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] Firstly, the utility model includes an electrical connector and an outer protective shell is arranged at the front end of the electrical connector, a neutron detector support rod is arranged inside the outer protective shell, an inner protective tube is sleeved with the neutron detector support rod as the center, the outer protective shell and the inner protective tube are coaxially distributed, a neutron detector is arranged inside the inner protective tube with the neutron detector support rod as the center, a temperature measuring thermocouple is arranged at the front end of the neutron detector support rod inside the outer protective shell, and an axial notch is arranged on the inner protective tube, and brazing fixing blocks are arranged on the axial notch at intervals along the axial direction of the inner protective tube, a liquid level thermocouple and an electric heater are arranged on the brazing fixing block, the liquid level thermocouple and the electric heater are fixed in the inner wall of the outer protective shell by the brazing fixing block, the liquid level thermocouple is distributed on both sides of the electric heater, the neutron detector is connected to the neutron detector support rod, which integrates the core neutron detection, multi-point temperature measurement and liquid level measurement functions, solves the problem of scattered interfaces of existing core nuclear measuring instruments, and provides important support for the subsequent upgrading and transformation of the core instrument system of VVER reactor-type nuclear power plants and the localization substitution and supply of core instrument casing components.

[0019] Secondly, the liquid level thermocouples of the utility model are distributed on both sides of the electric heater, so that by adding a plurality of heaters near the liquid level thermocouples, the product can obtain liquid level information through temperature signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the structure of the utility model.

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram in the middle.

[0022] Figure 3 It is a schematic diagram of the main view of the measurement structure of the utility model.

[0023] Figure 4 It is a left view schematic diagram of the measurement structure of the utility model.

[0024] Figure 5 It is a top view schematic diagram of the measurement structure of the utility model.

[0025] Figure 6 It is a schematic diagram of the wall-attached structure of the utility model.

[0026] Figure 7 It is a side view schematic diagram of the wall-attached structure of the utility model.

[0027] In the figure: 1, electrical connector; 2, cold end compensation thermal resistor; 3, thermocouple cold end connection point; 4, thermal insulation cover; 5, temperature measuring thermocouple; 6, liquid level thermocouple; 7, electric heater; 8, inner protection tube; 9, neutron detector support rod; 10, neutron detector; 11, outer protective shell; 41, sealant; 42, thermal insulation layer; 43, insulating powder. DETAILED DESCRIPTION

[0028] In the description of the present utility model, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] In the description of the present utility model, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0032] Example 1: See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7A core instrument assembly includes an electrical connector 1 and an outer protective shell 11 is arranged at the front end of the electrical connector 1, a neutron detector support rod 9 is arranged inside the outer protective shell 11, an inner protective tube 8 is sleeved with the neutron detector support rod 9 as the center, the outer protective shell 11 and the inner protective tube 8 are coaxially distributed, a neutron detector 10 is arranged inside the inner protective tube 8 with the neutron detector support rod 9 as the center, a temperature measuring thermocouple 5 is arranged at the front end of the neutron detector support rod 9 inside the outer protective shell 11, and an axial notch is arranged on the inner protective tube 8, and brazing fixing blocks 12 are distributed on the axial notch along the axial direction of the inner protective tube 8 at intervals, a liquid level thermocouple 6 and an electric heater 7 are arranged on the brazing fixing block 12, the liquid level thermocouple 6 and the electric heater 7 are fixed in the inner wall of the outer protective shell 11 by the brazing fixing block 12, the liquid level thermocouple 6 is distributed on both sides of the electric heater 7, and the neutron detector 10 is connected to the neutron detector support rod 9. The hot end of the liquid level thermocouple 6 is located near the electric heater 7. The liquid level thermocouple 6 and the electric heater 7 are tightly fixed to the inner wall of the outer protective shell 11. When the liquid level changes, the temperature display of the liquid level thermocouple 6 changes synchronously, thereby realizing the liquid level measurement. The temperature measuring thermocouple 5 can be set separately to measure the ambient temperature of the corresponding position, and multiple liquid level measurement points and temperature measurement points at different positions can be set according to design requirements.

[0033] like Figure 1 As shown, the liquid level thermocouple 6 of the utility model is fixed tightly on the outer protective shell 11 in the form of wall-attached, so that it has good thermal conductivity and faster response speed. In this embodiment, the liquid level thermocouple 6 is distributed at intervals on the axial inner wall of the outer protective shell 11, so that multi-position measurement can better meet the use requirements. It can be seen that it has the function of fast response temperature measurement.

[0034] Embodiment 2: It can be explained on the basis of embodiment 1, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a heat preservation cover 4 is provided inside the electrical connector 1, and a cold-end compensating thermal resistor 2 and a thermocouple cold-end connection point 3 parallel to each other are axially distributed inside the heat preservation cover 4. By adding the heat preservation cover 4 to the cold-end compensating thermal resistor 2 and filling the interior of the heat preservation cover 4 with a high thermal conductivity material, the temperature of the cold-end compensating thermal resistor 2 is made more uniform.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, it is to be noted that sealants 41 are provided at both ends of the heat-insulating cover 4.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, it is also desired to explain that a heat insulating layer 42 is provided on the outer surface of the heat preservation cover 4, and a heat insulating layer 4 (heat insulating material covering) is added to the outside of the heat preservation cover 4 to reduce the influence of the external ambient temperature, and a cold end compensation thermistor 2 (a high-precision platinum thermistor is used to measure the cold end) temperature is used and temperature compensation is performed in the control system, and the signal transmission of the liquid level, thermistor and the thermocouple is unified into a copper cable, which can greatly reduce the processing difficulty of connectors and multi-core cables, and can also ensure the accuracy of the temperature measurement of the thermocouple.

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, insulating powder 43 is arranged inside the heat preservation cover 4.

[0038] Embodiment 3: It can be described on the basis of Embodiment 1 or Embodiment 2, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the neutron detectors 10 are distributed axially along the neutron detector support rod 9 , and each neutron detector 10 is connected to the neutron detector support rod 9 .

[0039] Embodiment 4: It can be described on the basis of Embodiment 1, Embodiment 2 or Embodiment 3, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the electrical connector 1 includes an outer tube and an outer jacket disposed inside the outer tube, wherein the outer jacket is provided with a copper wire and a heating wire element, and the outer tube contains dry nitrogen, and both ends of the outer tube are sealed. It should be noted that the outer tube is made of a stainless steel tube, and the outer jacket is made of a magnesium oxide column.

[0040] Embodiment 5: It can be explained on the basis of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 that the core wire of the neutron detector signal line in the neutron detector support rod 9 adopts a twisted pair structure, which can reduce the interference of external signals and reduce the measurement error caused by the change of the core radiation field gradient.

[0041] The utility model integrates the functions of core neutron detection, multi-point temperature measurement and liquid level measurement. All measuring sensors are connected to the acquisition central control through an electrical connector. The signal output integration is more centralized and easy to manage. Not only is the signal output integration more centralized and easy to manage, but the signal output integration performance is excellent, which reduces the need to set up installation holes due to extended measurement and liquid level, and can better meet usage requirements.

[0042] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structural or equivalent process changes made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the utility model patent.

Claims

1. A core instrument assembly, characterized in that: The invention comprises an electrical connector (1) and an outer protective shell (11) disposed at the front end of the electrical connector (1), a neutron detector support rod (9) being disposed inside the outer protective shell (11), an inner protective tube (8) being sleeved around the neutron detector support rod (9), the outer protective shell (11) and the inner protective tube (8) being coaxially distributed, a neutron detector (10) being disposed inside the inner protective tube (8) around the neutron detector support rod (9), and a temperature measuring thermocouple ( 5), and the inner protective tube (8) is provided with an axial notch, and brazing fixing blocks (12) are spaced apart on the axial notch along the axial direction of the inner protective tube (8), and a liquid level thermocouple (6) and an electric heater (7) are provided on the brazing fixing block (12), and the liquid level thermocouple (6) and the electric heater (7) are both fixed to the inner wall of the outer protective shell (11) through the brazing fixing block (12), and the liquid level thermocouple (6) is distributed on both sides of the electric heater (7), and the neutron detector (10) is connected to the neutron detector support rod (9).

2. The core instrument assembly according to claim 1, characterized in that: A heat preservation cover (4) is arranged inside the electrical connector (1), and cold end compensation thermal resistors (2) and thermocouple cold end connection points (3) are axially distributed in parallel with each other inside the heat preservation cover (4).

3. The core instrument assembly according to claim 2, characterized in that: Sealant (41) is provided at both ends of the heat-insulating cover (4).

4. The core instrument assembly according to claim 2, characterized in that: The outer surface of the heat-insulating cover (4) is provided with a heat-insulating layer (42).

5. The core instrument assembly according to claim 2, 3 or 4, characterized in that: Insulating powder (43) is arranged inside the heat-insulating cover (4).

6. The core instrument assembly according to claim 1, 2, 3 or 4, characterized in that: The neutron detectors (10) are distributed axially along the neutron detector support rod (9), and each neutron detector (10) is connected to the neutron detector support rod (9).

7. The core instrument assembly according to claim 1, 2, 3 or 4, characterized in that: The electrical connector (1) comprises an outer tube and an outer jacket arranged inside the outer tube, a copper wire and a heating wire element are arranged inside the outer jacket, and dry nitrogen is contained in the outer tube.

8. The core instrument assembly according to claim 7, characterized in that: The outer tube is made of a stainless steel tube, and the outer jacket is made of a magnesium oxide column.

9. The core instrument assembly according to claim 1, 2, 3, 4 or 8, characterized in that: The core wire of the neutron detector signal line in the neutron detector support rod (9) adopts a twisted pair structure.

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