CN218729916U - Reactor core neutron and temperature measurement detector assembly - Google Patents
Reactor core neutron and temperature measurement detector assembly Download PDFInfo
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- CN218729916U CN218729916U CN202222456026.XU CN202222456026U CN218729916U CN 218729916 U CN218729916 U CN 218729916U CN 202222456026 U CN202222456026 U CN 202222456026U CN 218729916 U CN218729916 U CN 218729916U
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- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 90
- 238000003466 welding Methods 0.000 claims abstract description 46
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 36
- 239000010935 stainless steel Substances 0.000 claims abstract description 36
- 230000007704 transition Effects 0.000 claims abstract description 27
- 230000001681 protective effect Effects 0.000 claims abstract description 23
- 230000035515 penetration Effects 0.000 claims abstract description 22
- 239000000523 sample Substances 0.000 claims abstract description 19
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 27
- 229910052697 platinum Inorganic materials 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 7
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- 238000009659 non-destructive testing Methods 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The utility model relates to an automated control field especially relates to reactor core neutron and temperature measurement detector subassembly. The probe assembly includes: the end plug, the stainless steel sleeve, the reducing transition pipe, the sealing penetration piece, the connector mounting pipe and the connector are sequentially connected; a cavity is formed inside the stainless steel sleeve and the reducing transition pipe, and a lower protective sleeve and a thin-walled pipe are arranged in the cavity from bottom to top; the cable adaptor protects the thermocouple and the armored cable of the self-powered detector by the transfer of the flexible lead, the flexible lead is welded with a contact pin of the connector, and the welding position of the contact pin is encapsulated in the connector through assembling and fixing a sealing barrel; the cold end of the thermocouple and the cable adapter are attached and mounted and kept at the same height; the thermocouple and the self-powered detector penetrate through the sealing penetrating piece and the cable sealing piece and extend into the cavity; the exhaust pipe is connected with the sealing penetrating piece and the cable sealing piece. The utility model discloses simple structure, the security is high, is applicable to in the third generation nuclear power station.
Description
Technical Field
The utility model relates to an automation control field especially relates to a reactor core neutron and temperature measurement detector subassembly.
Background
Most of the second generation and previous nuclear power plants adopt a reactor core measuring system with a movable micro fission chamber as a sensitive element, and although the reactor core measuring system is widely applied, the installation needs to penetrate from the bottom of a reactor pressure vessel and adopt fission materials. The third generation plant optimizes this part of the design in terms of safety and materials, due to the material limitations of fissile materials and the risk of holes in the bottom of the pressure vessel. The mobile miniature fission chamber is less applied to subsequent models.
The in-core neutron and temperature measurement detector assembly is a combination detector integrating a self-powered neutron detector and a sheathed thermocouple. The self-powered neutron detector is used for measuring the neutron fluence rate of the reactor core and the axial distribution of the neutron fluence rate; the sheathed thermocouple is used to measure the outlet temperature of the fuel assembly coolant and the temperature within the reactor pressure vessel under accident conditions.
The reactor core neutron and temperature measurement detector assembly penetrates into the pressure vessel through a sealing piece arranged on the top cover of the pressure vessel, and a special connector is arranged at the end part of the reactor core neutron and temperature measurement detector assembly, which extends out of the pressure vessel, and is used for connecting a signal transmission cable.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the utility model provides a reactor core neutron and temperature measurement detector subassembly, is applicable to the third generation nuclear power station, can adopt from the male mode of reactor top container to go on, and sealed mode is more convenient, adopts the self-power neutron detector of no fission material to carry out the measurement of neutron fluence rate, and is safer.
The utility model provides a reactor core neutron and temperature measurement detector subassembly, include: the end plug, the stainless steel sleeve, the reducing transition pipe, the sealing penetration piece, the connector mounting pipe and the connector are connected in sequence in a welding mode;
an integral cavity is formed inside the stainless steel sleeve and the reducing transition pipe, a lower protective sleeve and a thin-walled pipe are sequentially arranged in the cavity from top to bottom, and inert gas is filled in the cavity;
the soft lead switching protection is carried out on the thermocouple and the armored cable of the self-powered detector through the cable switching piece, the soft lead is welded with a contact pin of the connector, and the welding position of the contact pin is packaged in the connector through assembling and fixing a sealing barrel;
the cold end of the thermocouple and the cable adapter are attached and mounted and kept at the same height;
a thermocouple and a self-powered probe extend through the seal penetration and the cable seal into the cavity;
the sealed penetrating piece and the cable sealing piece realize fixing and positioning functions on the thermocouple and a cable of the self-powered detector, and the exhaust pipe is connected with the sealed penetrating piece and the cable sealing piece to complete leakage detection in a matching mode.
Preferably, the end plug is bullet-shaped.
Preferably, the self-powered detectors are arranged in 1-7 rows, the main bodies of the self-powered detectors are arranged in an equidistant descending manner or in an equidistant arrangement manner, and the positioning and fixing of the self-powered detectors are completed by the cooperation of the thin-walled tubes and the positioning pieces.
Preferably, the arrangement of the self-powered detectors is positioned and fixed by using slots in different directions on the fixed thin-walled tube and positioning pieces in different types.
Preferably, the self-powered detector is arranged and fixed by using fixed positioning support bars and positioning pieces of different specifications.
Preferably, the positioning support bars are connected with the thin-walled tube in a welding mode, and different parts of each self-powered detector main body are fixed through different positioning pieces and the positioning support bars;
the fixation of the self-powered detector is divided into: the upper part of the main body is fixed, the lower part of the main body is fixed, and the cable part is fixed;
according to the characteristics of different parts of the self-powered detector, the limiting and fixing are completed through spot welding of different special-shaped positioning pieces and positioning support bars.
Preferably, the hot end of the thermocouple is attached to the inner wall of the stainless steel sleeve.
Preferably, the hot end of the thermocouple and the thermocouple wall-attached part are at the same height, the hot end of the thermocouple and the thermocouple wall-attached part are welded to ensure that the thermocouple and the inner wall of the stainless steel sleeve are attached, and other armored cables penetrate through the middle of the thermocouple wall-attached part.
Preferably, the cold end of the thermocouple is a platinum resistor, and the platinum resistor is a four-wire Pt100 platinum resistor.
Preferably, the wall of the connector mounting tube is thickened.
Preferably, the sealing penetration piece is connected with the lower protective sleeve in a welding mode; the lower protective sleeve is connected with the thin-walled tube in a welding mode.
Preferably, the connector is a self-sealing connector or a sealless connector;
the self-sealing connector has a sealing function when the plug and the socket are engaged, and adopts a threaded connection mode;
the sealless connector does not have a sealing function when the plug and the socket are engaged, and adopts a direct-insertion mode for connection.
Compared with the prior art, the utility model discloses a reactor core neutron and temperature measurement detector subassembly, simple structure is suitable for with polytype reactor. The method is safer by adopting a self-powered neutron detector without fissile materials to measure the neutron fluence rate. On the basis, the detector assembly is added with the monitoring function of the core outlet temperature, and one layer of monitoring and protection is added for the safety of the reactor. When the sealing device is used, the sealing device is inserted from a stack top container, so that the sealing device can be conveniently sealed with a pressure container, and the sealing mode is more convenient and simpler than the sealing mode at the stack bottom.
Drawings
FIG. 1 illustrates a cross-sectional view of an embodiment of a neutron and temperature measurement detector assembly in a core;
FIG. 2 shows an enlarged view at the seal penetration;
FIG. 3 illustrates an embodiment of an equidistant descending arrangement of components within a stainless steel sleeve;
FIG. 4 showsbase:Sub>A cross-sectional view A-A of FIG. 3;
FIG. 5 shows a cross-sectional view B-B of FIG. 3;
FIG. 6 shows a cross-sectional view of C-C of FIG. 3;
FIG. 7 shows an isometric arrangement of components in a stainless steel sleeve in another embodiment;
FIG. 8 shows a cross-sectional view of E-E of FIG. 7;
FIG. 9 shows a cross-sectional view F-F of FIG. 7;
FIG. 10 shows a cross-sectional view G-G of FIG. 7;
in the figure, the position of the first and second end faces,
1-bullet-type end plugs; 2-stainless steel sleeve; 3-reducing transition pipe; 4-sealing the penetration piece; 5-cable seals; 6-an exhaust pipe; 7-connector mounting tube; 8-a cable transition piece; 9-sealing the cylinder; 10-a connector; 11-platinum resistance; 12-lower protective sleeve; 13-a thin walled tube; 14-a thermocouple; 15-self powered detector; 16-thermocouple adherence part; 17-a positioning element (a); 18-positioning support bars; 19-a positioning element (B); 20-a locator (C); 21-positioning element (D).
Detailed Description
For further understanding of the present invention, embodiments of the present invention are described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the present invention.
The utility model discloses a reactor core neutron and temperature measurement detector subassembly, inside contain a plurality of self-supporting neutron detector that are used for measuring reactor core neutron fluence rate, a plurality of be used for elements such as thermocouple of measuring temperature that are used for. In some cases, 1 platinum resistor is also included for measuring the temperature at the cold end of the thermocouple. These elements are protected and secured within the reactor core guide tube and to the pressure vessel top flange by a series of structures.
The embodiment of the utility model discloses a reactor core neutron and temperature measurement detector subassembly, as shown in fig. 1 and 2, include: the end plug 1, the stainless steel sleeve 2, the reducing transition pipe 3, the sealing penetration piece 4, the connector mounting pipe 7 and the connector 10 are connected in sequence in a welding mode;
an integral cavity is formed inside the stainless steel sleeve 2 and the reducing transition pipe 3, a lower protective sleeve 12 and a thin-walled pipe 13 are sequentially arranged in the cavity from top to bottom, and inert gas is filled in the cavity;
the soft lead switching protection is carried out on the thermocouple 14 and the armored cable of the self-powered detector 15 through the cable switching piece 8, the soft lead is welded with a contact pin of the connector 10, and the welding position of the contact pin is packaged in the connector 10 through the assembling and fixing sealing cylinder 9;
the cold end of the thermocouple 14 and the cable adaptor 8 are attached and mounted and are kept at the same height;
a thermocouple 14 and a self-powered probe 15 extend through the seal penetration 4, the cable seal 5, into the cavity;
the sealing penetration piece 4 and the cable sealing piece 5 realize the positioning of the thermocouple 14 and a cable of the self-powered detector 15, and the exhaust pipe 6 is connected with the sealing penetration piece 4 and the cable sealing piece 5 to complete the leakage detection in a matching way.
The end plug 1 is preferably a bullet-head type plug, and the conical surface and the high-finish design of the end part ensure that the detector assembly is more labor-saving when being inserted and installed into a core guide pipe.
The end plugs 1, the stainless steel sleeves 2 and the reducing transition pipes 3 are connected with each other by butt-welding joints with simple structures and high stability to form a mechanical part of a pressure-bearing part.
The stainless steel sleeve 2 is made of a cold-drawn seamless steel pipe; generally, the reducing transition pipe 3 is sealed with a flange at the top of the pressure vessel through a Swagelok through joint, a graphite seal or other sealing devices; as a direct primary pressure boundary, protecting its internal components from core coolant; and the materials and the welding lines are verified by nondestructive testing and a hydraulic external pressure test.
The stainless steel sleeve 2 and the reducing transition pipe 3 form an integral cavity inside, two ends of the cavity are respectively sealed by the end plug 1 and the sealing penetrating piece 4, and the inside of the cavity is filled with inert gas, preferably helium so as to protect internal elements.
A lower protective sleeve 12 and a thin-walled tube 13 are sequentially arranged in the cavity from top to bottom, and the sealing penetrating piece 4 is connected with the lower protective sleeve 12 in a welding mode; the lower protective sleeve 12 is connected with the thin-walled tube 13 by welding.
The sealing penetration piece 4, the cable sealing piece 5, the thermocouple 14 and the self-powered detector 15 realize the sealing of an internal sealing structure through brazing, and belong to secondary pressure-bearing mechanical parts:
the reducing transition pipe 3 and the sealing penetration piece 4 are sealed by welding, such as argon arc welding or laser welding, so that the reactor core coolant is prevented from rushing out along the interior of the detection assembly after the mechanical part of the pressure-bearing part is damaged; the sealing and bearing performance of the part is verified by nondestructive testing and a hydrostatic internal pressure test.
The sealing penetrating piece 4 is connected with the connector mounting pipe 7, the connector mounting pipe 7 is sealed and connected with the shell of the connector 10 in a welding mode, an externally visible non-pressure-bearing structure is formed together, and the functions of protecting the switching of internal elements and rigidly supporting the internal elements are achieved. Inside the connector mounting tube 7 are arranged a cable transition piece 8, a thermocouple 14, a self powered probe 15.
The soft lead switching protection is carried out on the thermocouple 14 and the armored cable of the self-powered detector 15 through the cable switching piece 8, the soft lead is welded with a contact pin of the connector 10, and the welding position of the contact pin is packaged in the connector 10 through the assembling and fixing sealing cylinder 9;
the cold end of the thermocouple 14 and the cable adaptor 8 are attached and mounted and are kept at the same height;
a thermocouple 14 and a self-powered probe 15 extend through the seal penetration 4 and the cable seal 5 into the cavity;
the self-powered detector 10 is provided with 1-7 pieces, the main bodies of the self-powered detector 10 are arranged in an equidistant descending manner or in an equidistant arrangement, and the positioning and the fixing of the self-powered detector 10 are completed by the matching of the thin-wall pipe 13 and the positioning piece.
The arrangement of the self-powered probe 10 in the stainless steel sleeve 2 is designed in two ways:
the method comprises the following steps: the fixed thin-wall pipe 13 is positioned and fixed by the grooving in different directions and the positioning pieces in different types, so that the axial position of the self-powered detector is unchanged, as shown in figure 3;
the second method comprises the following steps: the fixed positioning support bar 18 and positioning pieces with different specifications are used for positioning and fixing, so that the axial position of the self-powered detector is ensured to be unchanged, as shown in fig. 7;
the thermocouple 14 inside the stainless steel sleeve 2 is fixed in both adherent and non-adherent designs:
the first method is as follows: the thermocouple 14 is not attached to the inner wall of the stainless steel sleeve 2, and the method is suitable for positions insensitive to temperature response;
the second method comprises the following steps: the thermocouple 14 adheres to the inner wall of the stainless steel sleeve 2, the mode is suitable for the position sensitive to temperature response, the response time can be reduced, the hot end of the thermocouple can be ensured to adhere to the wall all the time by welding or assembling the hot end of the thermocouple 14 and the thermocouple adhering part 16, and the response time is greatly shortened.
The compensation of the cold end of the detector assembly thermocouple 14 is designed in two ways:
the method I comprises the following steps: the thermocouple temperature is compensated at the cold end of thermocouple 14, typically by a platinum resistor. The four-wire system can eliminate the influence of the resistance of the lead-out wire and the change of the contact resistance and the resistance value between the connecting wires, and has high measurement precision. The advantage is that the back end cable can adopt a common copper cable, and the cost is reduced.
The second method comprises the following steps: and temperature compensation is arranged at the measuring instrument end. At the moment, a platinum resistor is not required to be arranged in the detector assembly for temperature compensation, but the cable core wire at the rear end is required to be made of the same material thermocouple core wire, so that the cost is higher.
The connector is a self-sealing connector or a non-sealing connector;
the self-sealing connector has a sealing function when the plug and the socket are engaged, and adopts a threaded connection mode;
the sealless connector does not have a sealing function when the plug and the socket are engaged, and adopts a direct-insertion mode for connection.
The exhaust pipe 6 is used for matching with an internal sealing structure to complete leakage detection work; the connector mounting pipe 7, the sealing penetrating piece 4 and the shell of the connector 10 form an externally visible non-pressure-bearing structure together, and the functions of protecting the switching of internal elements and rigidly supporting the internal elements are achieved; the thermocouple 14 and the armored cable of the self-powered detector 15 are subjected to flexible conductor switching protection through the cable switching piece 8, so that the switching reliability is greatly improved; after welding the flexible lead and the contact pin of the connector 10, packaging the welding position through the sealing cylinder 9 to enhance the vibration resistance of the connecting welding point; after the lower protective sleeve 12, the sealing penetrating piece 4 and the thin-walled tube 13 are welded, the self-powered detector can be positioned and fixed by matching the thin-walled tube with the positioning piece.
The connector 10 is of both a self-sealing connector and a non-sealing connector design. The self-sealing connector has a sealing function when the plug and the socket are engaged, generally adopts a threaded connection mode, can simplify the structural design of the detector assembly, but has larger size; the non-sealing connector does not have a sealing function when the plug and the socket are engaged, adopts a direct-insertion mode for connection, is convenient to install, and needs an additional external sealing design.
In order to further understand the present invention, the following embodiments are combined to illustrate the reactor core neutron and the temperature measurement detector assembly in detail, and the protection scope of the present invention is not limited by the following embodiments.
Example 1
The probe assembly includes: the device comprises a bullet head type end plug 1, a stainless steel sleeve 2, a reducing transition pipe 3, a sealing penetration piece 4, a cable sealing piece 5, an exhaust pipe 6, a connector mounting pipe 7, a cable adapter piece 8, a sealing barrel 9, a connector 10, a platinum resistor 11, a lower protective sleeve 12, a thin-walled tube 13, a thermocouple 14, a self-powered detector 15, a thermocouple wall-attached part 16 and a positioning piece (A) 17.
Wherein the positions of 1-13 are shown in figure 1; 14-15 corresponding parts penetrate through the whole detector assembly, and the measurement sensitive part of the detector assembly is positioned inside the stainless steel sleeve 2; the components 16, 17 are inside the stainless steel sleeve 2. The relative connection is shown in fig. 3. The detailed connection method and the embodiment are as follows:
the bullet head type end plug 1 is more labor-saving when the detector assembly is inserted into a reactor core guide pipe for installation through the conical surface and the high-finish design of the end part, the bullet head type end plug 1, the stainless steel sleeve 2 and the reducing transition pipe 3 are connected in a welding mode, and a welding interface is welded in a self-melting mode of a base material; generally, the section of the reducing transition pipe 3 is sealed with a flange at the top of the pressure vessel through a Swagelok through joint, a graphite seal or other sealing devices, so that the bullet-shaped end plug 1, the stainless steel sleeve 2 and the reducing transition pipe 3 are direct loop pressure boundaries to protect internal elements from being isolated from the coolant of the reactor core; the pressure boundary is verified by nondestructive testing and hydrostatic external pressure test; the three sections are filled with helium gas to protect the internal components.
The sealing penetration 4, the cable seal 5, the exhaust pipe 6, the thermocouple 14, and the self-powered probe 15 together constitute an internal sealing structure, which is sealed and connected by brazing as shown in fig. 2. The exhaust pipe 6 is used for matching with an internal sealing structure to complete leakage detection work.
The sealing penetrating piece 4 is connected with the reducing transition pipe 3, the connector mounting pipe 7 and the lower protective sleeve 12 in a welding mode, and the detailed relation is as follows:
the sealing penetration piece 4 and the reducing transition pipe 3 are welded to ensure sealing and pressure bearing; the welding seams among the partial secondary pressure-bearing mechanical components are verified through nondestructive testing and hydrostatic internal pressure testing.
The sealing penetration piece 4 and the connector mounting pipe 7, and the connector mounting pipe 7 and the shell of the connector 10 are ensured to be sealed and connected in a welding mode, and form an externally visible non-pressure-bearing structure together, so that the functions of protecting the switching of internal elements and rigidly supporting the internal elements are achieved.
The sealing penetration piece 4 is connected with the lower protective sleeve 12 in a welding mode; the lower protective sleeve 12 is connected with the thin-wall pipe 13 by welding. As can be seen in fig. 1, the sealing penetration 4 is above the lower protective sheath 12, the lower protective sheath 12 is above the thin-walled tube 13; the lower protective sleeve 12 is arranged inside the reducing transition pipe 3, and the lower protective sleeve 3 and the lower protective sleeve 12 are in clearance fit; the thin-wall pipe 13 is partially arranged inside the reducing transition pipe 3 and partially arranged inside the stainless steel sleeve 2.
The soft conductor switching protection is carried out on the thermocouple 14 and the armored cable of the self-powered detector 15 through the cable switching piece 8, so that the switching reliability is greatly improved; the cable transition piece 8 is inside the component 7, the relative position of which is shown in fig. 1; the flexible lead is welded with the contact pin of the connector 10 to ensure the transmission of the electrical signal; the interior of the connector 10 is subjected to a packaging process for the pin soldering position by fitting the fixed sealing cylinder 9 to ensure vibration resistance of the solder joint.
The connector 10 is of both a self-sealing connector and a non-sealing connector design. The self-sealing connector has a sealing function when the plug and the socket are engaged, generally adopts a threaded connection mode, can simplify the structural design of the detector assembly, but has larger size; the non-sealing connector does not have a sealing function when the plug and the socket are engaged, adopts a direct-insertion mode for connection, is convenient to install, and needs an additional external sealing design.
The platinum resistor 11 and the cable adaptor 8 are mounted in a fitting manner and are kept at the same height, and the relative position relationship is shown in fig. 1 or the connection relationship. According to different nuclear power unit designs, cold end compensation can be added at a measuring instrument and is not designed in a detector assembly.
As shown in figure 4, the hot end of the thermocouple 14 and the thermocouple wall-attached part 16 are at the same height, the hot end and the thermocouple wall-attached part are ensured to be attached to the inner wall of the stainless steel sleeve 2 through welding, and other armored cables penetrate through the middle part of the thermocouple wall-attached part 16, so that the temperature response time of the thermocouple can be ensured to meet the requirement.
The bodies of the self-powered detector 15 are arranged in equally spaced descending order, as shown in fig. 3, with a different number of elements at different heights. The positioning and fixing of the self-powered detector 15 and the positioning relation are completed by the matching of the thin-wall pipe 13 and the positioning piece. As shown in fig. 5-6, the limiting of the self-powered detector 15 can be completed through the thin-wall tube 13 due to the large number of elements at the section B-B; the limiting of the self-powered detector 15 can be ensured by limiting the C-C section through the perforated thin-walled tube 13 and the positioning piece (A) 17; by analogy, all the self-powered probes 13 with different lengths can be fixed by utilizing the grooves of the thin-wall pipe 13 in different directions and the positioning pieces with different sizes, and the self-powered probes 13 can be prevented from twisting in the length direction.
The self-powered detector 15 can be provided with 1-7 detectors as required.
After the self-powered detector 15 and the thermocouple 14 are completely fixed, the self-powered detector can be sleeved into an internal cavity formed by the bullet head type end plug 1, the stainless steel sleeve 2 and the reducing transition pipe 3.
Example 2
The detection assembly includes: the lengths of the elements in the stainless steel sleeve 2 are arranged at equal intervals. The detector assembly includes: the device comprises a bullet head type end plug 1, a stainless steel sleeve 2, a reducing transition pipe 3, a sealing penetrating piece 4, a cable sealing piece 5, an exhaust pipe 6, a connector mounting pipe 7, a cable adaptor 8, a sealing barrel 9, a connector 10, a platinum resistor 11, a lower protective sleeve 12, a thin-wall pipe 13, a thermocouple 14, a self-powered detector 15, a thermocouple wall-adhering part 16, a positioning support bar 18, a positioning piece (B) 19, a positioning piece (C) 20 and a positioning piece (D) 21. Wherein the positions of 1-13 are shown in figure 1; the corresponding parts 14-21 are arranged inside the stainless steel sleeve 2, and the relative connection relationship is shown in figure 3. The detailed connection method and implementation mode are as follows:
the components 1 to 16 of the detector assembly of this embodiment are the same as the detector assembly of embodiment 1.
The detector assembly of example 2 differs from the detector assembly of example 1 only in the type and arrangement of the self-powered detectors 15 within the stainless steel sleeve 2, and the detailed arrangement of the detector assembly 2 within the stainless steel sleeve 2 is described below:
the bodies of the self-powered probes 15 are arranged at equal intervals as shown in fig. 7. In order to ensure the position of the main body of the self-powered detector 15 to be fixed, the positioning support bar 18 is connected with the thin-walled tube 13 in a welding mode; the fixing of different parts of the main body of each self-powered detector 15 is accomplished by different positioning members (B-C) 19-21 and positioning support bars 18. The fixing of the self-powered probe 15 is divided into: the upper part of the main body is fixed, the lower part of the main body is fixed, and the cable part is fixed. The detailed fixing mode and function are realized as follows:
the self-powered probe 15 is fixed on the upper part of the main body: as shown in fig. 8, the spot welding by the special-shaped positioning member (B) 19 and the positioning support bar 18 can be performed by laser welding, resistance welding, brazing, etc. to limit the upper part of the main body of the self-powered detector 15;
the cable part of the self-powered probe 15 is fixed: as shown in fig. 9, the position limiting and fixing of the cable part of the self-powered detector 15 is completed by spot welding of the special-shaped positioning piece (C) 20 and the positioning support bar 18; the spot welding can adopt modes such as laser welding, resistance welding, brazing and the like;
the self-powered probe 15 is fixed on the lower part of the body: as shown in fig. 10, the welding for accomplishing the limit fixing of the lower part of the main body of the self-powered probe 15 is accomplished by spot welding of the special-shaped positioning piece (D) 21 and the positioning support bar 18;
the self-powered detector 15 can be provided with 1-7 detectors as required.
After the self-powered detector 15 and the thermocouple 14 are completely fixed, the self-powered detector can be sleeved into an internal cavity formed by the bullet head type end plug 1, the stainless steel sleeve 2 and the reducing transition pipe 3.
The above description of the embodiments is only intended to help understand the method of the present invention and its core idea. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A reactor core neutron and temperature measurement detector assembly, comprising: the end plug, the stainless steel sleeve, the reducing transition pipe, the sealing penetration piece, the connector mounting pipe and the connector are connected in sequence in a welding mode;
an integral cavity is formed inside the stainless steel sleeve and the reducing transition pipe, a lower protective sleeve and a thin-walled pipe are sequentially arranged in the cavity from top to bottom, and inert gas is filled in the cavity;
the soft lead switching protection is carried out on the thermocouple and an armored cable of the self-powered detector through the cable switching piece, the soft lead is welded with a contact pin of the connector, and the welding position of the contact pin is packaged in the connector through an assembly fixing sealing cylinder;
the cold end of the thermocouple and the cable adapter are attached and mounted and kept at the same height;
a thermocouple and a self-powered probe extend through the seal penetration and the cable seal into the cavity;
the sealing through piece and the cable sealing piece realize the fixing and positioning functions on the thermocouple and the cable of the self-powered detector, and the exhaust pipe is connected with the sealing through piece and the cable sealing piece to finish the leakage detection in a matching way.
2. The in-core neutron and temperature measurement detector assembly of claim 1, wherein the end plugs are bullet-shaped.
3. The in-core neutron and temperature measurement detector assembly according to claim 1, wherein 1-7 self-powered detectors are arranged, the main bodies of the self-powered detectors are arranged in an equidistant descending manner or an equidistant arrangement, and the positioning and fixing of the self-powered detectors are completed by the cooperation of the thin-walled tubes and the positioning pieces.
4. The in-core neutron and temperature measurement detector assembly of claim 3 wherein the arrangement of self-powered detectors is positioned and secured using different orientations of slots and different types of spacers on the fixed thin walled tube.
5. The in-core neutron and temperature measurement detector assembly of claim 3 wherein the arrangement of self powered detectors is fixed in position using fixed positioning support bars and different gauge positioning pieces.
6. The assembly of in-core neutron and temperature measurement detectors according to claim 5, wherein the positioning support bars are connected with the thin-walled tube by welding, and different parts of each self-powered detector body are fixed by different positioning pieces and the positioning support bars;
the fixation of the self-powered probe is divided into: the upper part of the main body is fixed, the lower part of the main body is fixed, and the cable part is fixed;
according to the characteristics of different parts of the self-powered detector, the limiting and fixing are completed through spot welding of different special-shaped positioning pieces and positioning support bars.
7. The in-core neutron and temperature measurement probe assembly of claim 1, wherein the hot end of the thermocouple is attached to the inner wall of the stainless steel sleeve.
8. The in-core neutron and temperature measurement detector assembly of claim 1, wherein the hot end of the thermocouple is at the same height as the thermocouple attachment part, the hot end of the thermocouple and the thermocouple attachment part are welded to ensure that the thermocouple attachment part is attached to the inner wall of the stainless steel sleeve, and other armored cables penetrate through the middle of the thermocouple attachment part.
9. The in-core neutron and temperature measurement detector assembly of claim 1, wherein the cold end of the thermocouple is a platinum resistor, the platinum resistor being a four wire Pt100 platinum resistor.
10. The in-core neutron and temperature measurement detector assembly of claim 9, wherein the wall of the connector mounting tube is thickened.
11. The in-core neutron and temperature measurement detector assembly of claim 1, wherein the seal penetration is connected to the lower protective sheath by welding; the lower protective sleeve is connected with the thin-walled tube in a welding mode.
12. The in-core neutron and temperature measurement detector assembly of claim 1, wherein the connector is a self-sealing connector or a sealless connector;
the self-sealing connector has a sealing function when the plug and the socket are engaged, and adopts a threaded connection mode;
the sealless connector does not have a sealing function when the plug and the socket are engaged, and adopts a direct-insertion mode for connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222456026.XU CN218729916U (en) | 2022-09-16 | 2022-09-16 | Reactor core neutron and temperature measurement detector assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222456026.XU CN218729916U (en) | 2022-09-16 | 2022-09-16 | Reactor core neutron and temperature measurement detector assembly |
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| Publication Number | Publication Date |
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| CN218729916U true CN218729916U (en) | 2023-03-24 |
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| CN202222456026.XU Active CN218729916U (en) | 2022-09-16 | 2022-09-16 | Reactor core neutron and temperature measurement detector assembly |
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| CN (1) | CN218729916U (en) |
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Effective date of registration: 20231030 Address after: 102401 No. 8, Fusheng West Street, Changyang Road, Fangshan District, Beijing Patentee after: CHINA NUCLEAR CONTROL SYSTEM ENGINEERING Co.,Ltd. Patentee after: NUCLEAR POWER INSTITUTE OF CHINA Address before: 102401 No. 8, Fusheng West Street, Changyang Road, Fangshan District, Beijing Patentee before: CHINA NUCLEAR CONTROL SYSTEM ENGINEERING Co.,Ltd. |