CN112652412B - Nuclear power station neutron and temperature monitoring device - Google Patents
Nuclear power station neutron and temperature monitoring device Download PDFInfo
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- CN112652412B CN112652412B CN202011501226.1A CN202011501226A CN112652412B CN 112652412 B CN112652412 B CN 112652412B CN 202011501226 A CN202011501226 A CN 202011501226A CN 112652412 B CN112652412 B CN 112652412B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/112—Measuring temperature
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/02—Devices or arrangements for monitoring coolant or moderator
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/108—Measuring reactor flux
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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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Abstract
The invention relates to a nuclear power station neutron and temperature monitoring device. The neutron and temperature monitoring device for the nuclear power station comprises a plurality of detectors, sensors, compensation core wires, connecting pipes, electric connectors and a signal recorder; the sensor, the compensation core wire and the detectors are all arranged in the connecting pipe, and the detectors are arranged at intervals around the axis of the connecting pipe; any adjacent detectors are connected end to end, the sensor and the compensation core wire are connected to the detectors, and the length of the compensation core wire is the same as that of the detectors; the compensation core is used to generate a disturbance signal and the sensor is used to monitor the temperature at the reactor core coolant outlet. The nuclear power station neutron and temperature monitoring device provided by the invention solves the problem that the device generates interference along with the occurrence of nuclear reaction in a reactor, and further improves the accuracy of monitoring neutron fluence data so as to more accurately monitor the three-dimensional distribution of reactor core power, thereby reducing monitoring errors.
Description
Technical Field
The invention relates to the technical field of nuclear power plants, in particular to a neutron and temperature monitoring device for a nuclear power plant.
Background
The core instrumentation system is a key system for in-core neutron fluence rate measurements during reactor operation. In the normal operation process of a nuclear power station, the reactor pressure vessel is in a harsh environment of high temperature, high pressure and high radiation, when the reactor operating power is more than 20% of the rated power, a reactor core instrument system is required to be used for continuously monitoring the current neutron fluence rate value so as to remind an operator of the safety margin of the reactor and correspondingly control the reactivity. Meanwhile, for monitoring insufficient cooling of the reactor core after an accident, the outlet temperature of the reactor core needs to be measured. However, the currently used core instrumentation system has the following defects:
1. the reactor core neutron flux distribution monitoring system is added on the basis of the existing reactor core neutron flux distribution monitoring system, so that the accuracy of reactor core neutron flux distribution monitoring data is reduced, and the phenomenon of monitoring data confusion is easily caused.
2. When the neutron flux distribution result of the reactor core is obtained through calculation, calculation errors are introduced, so that the monitoring data are inaccurate, and the operation safety of the nuclear reactor is influenced.
3. When the neutron flux in the reactor core is measured, signal interference exists, and the accuracy of measuring and monitoring signals cannot be ensured.
Disclosure of Invention
Therefore, it is necessary to provide a nuclear power station neutron and temperature monitoring device aiming at the technical problems of low accuracy, monitoring error and the like in the process of monitoring neutron quantity in the prior art.
A neutron and temperature monitoring device for a nuclear power station comprises a plurality of detectors, sensors, compensation core wires, connecting pipes, electric connectors and a signal recorder;
the sensor, the compensation core wire and the detectors are all arranged in the connecting pipe, and the detectors are arranged around the axis of the connecting pipe at intervals; the sensors and the compensation core wires are connected with the detectors, and the length of the compensation core wires is the same as that of the detectors; one end of the connecting pipe is used for extending into the reactor, the other end of the connecting pipe passes through the electric connector and is connected with the signal recorder, the detector is used for monitoring neutron signals, the compensation core wire is used for generating an interference signal, and the sensor is used for monitoring the temperature at the outlet of the reactor core coolant.
In one embodiment, the neutron and temperature monitoring device in the nuclear power plant further comprises connecting wires, each detector is connected with the connecting wires, the connecting wires are arranged in the connecting pipes, and the connecting wires and the connecting pipes can synchronously extend into the reactor.
In one embodiment, the neutron and temperature monitoring device in the nuclear power plant further comprises a fixing bracket, the fixing bracket is installed inside the connecting pipe, and the plurality of detectors are installed on the fixing bracket.
In one embodiment, the fixed bracket comprises a liner, a liner connector, and a fixed tube;
the liner tube is laid on the inner wall of the connecting tube, at least part of the fixed tube is inserted into the liner tube, and the liner tube connecting piece is connected between the liner tube and the connecting tube; the plurality of detectors and the compensation core wires are mounted to the fixed pipe.
In one embodiment, the neutron and temperature monitoring device in the nuclear power station further comprises a switching tube, an extraction tube and a plug connector;
the adapter tube the stand-off pipe and the plug connector is end to end in proper order, just the adapter tube deviates from the one end of plug connector be used for with the connecting pipe deviates from the one end of reactor and is connected, the plug connector is used for connecting cable.
In one embodiment, the neutron and temperature monitoring device in the nuclear power plant further comprises a transition pipe, and the transition pipe is connected between the connecting pipe and the adapter pipe.
In one embodiment, the neutron and temperature monitoring device for the nuclear power plant further comprises a fixing sleeve, a first sealing element and a second sealing element;
the fixed sleeve is fixedly arranged in the adapter tube, the first sealing element is arranged on the adapter tube and is positioned at one end, deviating from the connecting tube, of the fixed sleeve, and the second sealing element is arranged in the adapter tube and is connected with the first sealing element.
In one embodiment, the neutron and temperature monitoring device in the nuclear power plant further comprises a corrugated pipe, and the corrugated pipe is connected between the extraction pipe and the plug connector.
In one embodiment, the neutron and temperature monitoring device in the nuclear power plant further comprises a mounting pipe, and the mounting pipe is connected between the corrugated pipe and the plug connector.
In one embodiment, the neutron and temperature monitoring device in the nuclear power plant further comprises a sealing plug, and the sealing plug is mounted at one end of the long pipe extending into the reactor.
The invention has the beneficial effects that:
the invention provides a neutron and temperature monitoring device for a nuclear power station, which comprises a plurality of detectors, a sensor, a compensation core wire, a connecting pipe, an electric connector and a signal recorder. Wherein, sensor, compensation heart yearn and a plurality of detector are all installed in the connecting tube, and a plurality of detectors arrange around the axis interval of connecting tube, and head-to-tail interconnect between the arbitrary adjacent detector, and sensor and compensation heart yearn all connect in the detector, and the length of compensation heart yearn is the same with the length of detector. When in actual use, the one end of connecting pipe can stretch into to the reactor in to set up the neutron fluence that the detector in the connecting pipe can monitor the reactor core, then transmit monitor signal to the signal record appearance through the electric connector, so that the staff gathers. Wherein, the setting up of sensor can be used for monitoring the temperature of reactor core coolant exit to ensure that the reactor can the safe operation, so that the neutron fluence of detector monitoring reactor normal operating in the time. In addition, the detectors are arranged at intervals around the axis of the connecting pipe, namely the detectors are arranged along the radial direction of the connecting pipe, so that the neutron fluence in the three-dimensional space in the reactor core can be monitored as fully as possible, the neutron fluence in the reactor core in a certain region is prevented from being omitted, and the accuracy of monitoring data is improved. Meanwhile, during monitoring, the compensation core wire can generate an interference signal, so that the problem that the device generates interference along with nuclear reaction in a reactor is solved, the accuracy of monitoring neutron fluence data is further improved, the three-dimensional distribution of reactor core power is monitored more accurately, and monitoring errors are reduced.
Drawings
FIG. 1 is a first partial schematic view of a neutron and temperature monitoring device of a nuclear power plant according to an embodiment of the present invention;
FIG. 2 is a second partial schematic view of a neutron and temperature monitoring device of a nuclear power plant according to an embodiment of the invention;
FIG. 3 is a third partial schematic view of a neutron and temperature monitoring device of a nuclear power plant according to an embodiment of the invention;
fig. 4 is a fourth partial schematic view of a neutron and temperature monitoring device in a nuclear power plant according to an embodiment of the present invention.
Reference numerals: 10-a detector; 11-connecting wires; 20-a sensor; 30-a compensation core wire; 40-connecting pipe; 50-fixing a bracket; 51-a liner tube; 52-liner connection; 53-a stationary tube; 60-a transfer tube; 70-an eduction tube; 80-plug connector; 90-a transition duct; 100-fixing a sleeve; 110-a first seal; 120-a second seal; 130-a bellows; 140-installing the tube; 150-sealing plug.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Aiming at the problem that errors exist in reactor core neutron flux (neutron fluence) monitoring in the prior art, the invention provides a nuclear power station neutron and temperature monitoring device, which can effectively reduce monitoring interference through the arrangement of a plurality of detectors 10 and compensation core wires 30 with the same length as the detectors 10, and meanwhile, the temperature monitoring of a reactor coolant outlet is matched with a sensor 20, so that the monitoring precision is improved, and the monitoring errors are reduced.
As shown in fig. 1 and 2, in an alternative embodiment, the neutron and temperature monitoring device in the nuclear power plant comprises a plurality of detectors 10, a sensor 20, a compensation core wire 30, a connecting pipe 40, an electric connector and a signal recorder; the sensor 20, the compensation core wire 30 and the plurality of detectors 10 are all arranged in the connecting pipe 40, and the plurality of detectors 10 are arranged at intervals around the axis of the connecting pipe 40; any adjacent probes 10 are connected end to end, the sensor 20 and the compensation core wire 30 are both connected to the probes 10, and the length of the compensation core wire 30 is the same as that of the probes 10; one end of the connecting pipe 40 is used for extending into the reactor, the other end of the connecting pipe 40 is connected with the signal recorder through the electric connector, the detector 10 is used for monitoring neutron signals, the compensation core wire 30 is used for generating an interference signal, and the sensor 20 is used for monitoring the temperature at the coolant outlet of the reactor core.
Specifically, connecting pipe 40 adopts the long tube, and the one end of connecting pipe 40 can stretch into to the reactor in for neutron fluence in the monitoring reactor, connecting pipe 40's the other end connecting cable, thereby be connected to the signal recorder, so that the signal recorder can accept monitoring signal, and change into artificial considerable characters, digit or image. Wherein, the sensor 20, the compensation core wire 30 and the probe 10 are all arranged on the inner pipe wall of the connecting pipe 40. The quantity of detector 10 is a plurality of, and a plurality of detectors 10 are arranged around the axis interval of connecting pipe 40, and arbitrary two adjacent detectors 10 connect each other end to end, just also be equivalent to all being provided with detector 10 along the radial of connecting pipe 40 to in-core neutron fluence in the three-dimensional space in the monitoring as far as possible is abundant, in order to avoid omitting the in-core neutron fluence in a certain block region, improves the accuracy of monitoring data. Wherein, the end of the connecting pipe 40 extending into the reactor is the end provided with the detector 10, so that the detector 10 can extend into the reactor to monitor the neutron fluence. Wherein the sensor 20 and the compensation core 30 are both connected to the probe 10 and spaced from the probe 10 about the axis of the connection tube 40. Wherein the length of the compensation core 30 is the same as the length of the probe 10. During monitoring, the connecting pipe 40 extends into the reactor, and stray signals are generated around the reactor when the detector 10 monitors, and the stray signals affect the monitoring accuracy of the detector 10. At this time, the compensation core 30 can generate an interference signal, so as to interfere the stray signals generated around the reactor, thereby reducing the influence of the stray signals on the monitoring accuracy of the detector 10. In practical use, one end of the connecting pipe 40, which is covered with the detector 10, the sensor 20 and the compensation core wire 30, extends into the reactor, the other end of the connecting pipe is connected with the signal recorder through the electric connector, the detector 10 is used for monitoring the neutron fluence in the reactor, and the compensation core wire 30 can generate an interference signal to cause interference to the stray-winding signal around the reactor, so that the monitoring precision of the detector 10 is improved. The sensor 20 is used for monitoring the temperature of the coolant outlet of the reactor, and the temperature of the coolant outlet after reaction is monitored, so that an operator can conveniently observe whether the reactor core is sufficiently cooled, and the safe operation of the reactor is ensured.
The detector 10 is a vanadium neutron detector 10, so as to continuously measure and monitor the distribution and change of neutron fluence in the core active area of the reactor, thereby flattening the neutron fluence and providing data basis for realizing the optimal distribution of power density. That is to say, the monitoring of the neutron fluence by the vanadium neutron detector 10 can accumulate the burn-up depth data of the reactor core fuel assemblies so as to provide data support for reactor refueling, and the data support is used as one of data bases for calculating the linear power and the nucleate boiling ratio of the fuel assemblies. Moreover, the plurality of probes 10 are arranged at intervals along the length direction of the connection pipe 40 while the plurality of probes 10 are arranged at intervals around the axis of the connection pipe 40, so that the installation depth of each probe 10 with respect to the connection pipe 40 is different. This arrangement not only provides a regular distribution of the plurality of probes 10 in the axial direction of the connecting pipe 40, but also in the circumferential direction of the connecting pipe 40. When the connecting pipe 40 is in a horizontal mode, the detector 10 is arranged on the side wall of the connecting pipe 40 at different heights in the vertical direction, so that the neutron fluence of different depths of the reactor core can be measured conveniently, and the neutron fluence data of different depth levels can be obtained. Meanwhile, two adjacent detectors 10 with different heights are connected end to end, so that the neutron fluence of any layer of neutron active region cannot be measured and monitored, the neutron flux three-dimensional distribution of the reactor core of the reactor can be monitored more accurately, and the power distribution condition of the reactor core can be mastered more conveniently. In addition, by arranging the compensation core wire 30 with the same length as the detector 10, the current signal (i.e. the stray-winding signal) generated by the nuclear reaction of the detector 10 in the reactor can be eliminated, so that the signal output by the detector 10 is the actual neutron fluence signal of the reactor core, and the accuracy of the measured data is ensured.
Wherein, the length of the plurality of detectors 10 is the same as the length of the compensation core 30, and the interference signal generated by the compensation core 30 is a current signal, and the monitoring accuracy is improved by the interference between the current signal and the current signal.
Wherein, the number of the sensors 20 and the number of the compensation core wires 30 can also be multiple, and the multiple sensors 20, the multiple compensation core wires 30 and the multiple detectors 10 are arranged at intervals around the axis of the connecting pipe 40, at the height, the height of the sensor 20 is higher than that of the compensation core wires 30, and the height of the compensation core wires 30 is higher than that of the detectors 10.
Wherein, the outer side of the connecting pipe 40 is fixed with a protection pipe in an argon arc welding mode, thereby improving the structural strength of the connecting pipe 40.
In an alternative embodiment, as shown in fig. 1, the neutron and temperature monitoring device in the nuclear power plant further includes a connection wire 11, each detector 10 is connected to the connection wire 11, the connection wire 11 is disposed in the connection pipe 40, and the connection wire 11 and the connection pipe 40 can synchronously extend into the reactor. That is, the plurality of detectors 10 are each connected to a connecting wire 11, the connecting wire 11 being a set of the plurality of detectors 10. When the connection tube 40 is inserted into the reactor, the connection wire 11 is inserted into the reactor along with the connection tube 40, and a nuclear reaction can be generated in the reactor. The aforementioned stray signal is generated by facilitating the nuclear reaction of the connecting wire 11 in the reactor. The purpose of the compensation core 30 is to eliminate the interference of the stray signals generated by the connecting wires 11.
In an alternative embodiment, as shown in fig. 3, the neutron and temperature monitoring apparatus in the nuclear power plant further includes a fixing bracket 50, the fixing bracket 50 is installed inside the connecting pipe 40, and the plurality of detectors 10 are installed on the fixing bracket 50. Specifically, the sensor 20, the compensation core wire 30 and the plurality of probes 10 are mounted with respect to the connection pipe 40 by the fixing bracket 50, and at the same time, the connection wire 11 is fixed with respect to the connection pipe 40 by the fixing bracket 50. The fixing bracket 50 is fixedly arranged inside the connecting pipe 40, and the detector 10, the sensor 20, the compensation core wire 30 and the connecting wire 11 can be stably installed relative to the connecting pipe 40 through the arrangement of the fixing bracket 50, so that the problem that the wires in the connecting pipe 40 are scattered in a vibration environment is reduced, and the anti-seismic performance of the connecting pipe 40 is improved.
As shown in fig. 3, in an alternative embodiment, the fixing bracket 50 includes a liner 51, a liner connector 52, and a fixing tube 53; the liner tube 51 is laid on the inner wall of the connecting tube 40, at least part of the fixed tube 53 is inserted into the liner tube 51, and the liner tube connecting piece 52 is connected between the liner tube 51 and the connecting tube 40; the plurality of probes 10 and the compensation core 30 are mounted to the fixed pipe 53. Specifically, the outer side wall of the liner tube 51 is connected to the inner wall of the connection tube 40, and the liner tube 51 is fixed relative to the connection tube 40 by the liner tube connection member 52. One end of the fixing tube 53 is inserted into the liner tube 51 and is fixedly connected with the inner wall of the liner tube 51, and the other end of the fixing tube 53 is fixed with the inner wall of the connecting tube 40. Wherein, fixed pipe 53 is provided with a plurality of connecting holes to fixed pipe 53 is worn to locate through the connecting hole by detector 10, compensation heart yearn 30, sensor 20 etc. thereby realizes the fixed of detector 10, compensation heart yearn 30 and sensor 20 relative connecting pipe 40.
The fixing tube 53 may be inserted into the liner tube 51 along the length direction thereof, and the fixing tube 53 may be fixed to the connection tube 40. The liner tube 51 can improve the structural strength of the connecting tube 40, so as to be better connected with the fixed tube 53 and support the fixed tube 53.
As shown in fig. 1, fig. 2 and fig. 4, in an alternative embodiment, the neutron and temperature monitoring apparatus in the nuclear power plant further includes an adapter tube 60, an extraction tube 70 and a plug connector 80; adapter tube 60, stand-off 70 and plug connector 80 are end-to-end in proper order, and the one end that adapter tube 60 deviates from plug connector 80 is used for being connected with the one end that connecting pipe 40 deviates from the reactor, and plug connector 80 is used for connecting the cable. Specifically, the one end of adapter tube 60 is connected with the one end that connecting pipe 40 deviates from the reactor core, and the other end of adapter tube 60 is connected with the one end of stand-off tube 70, and the one end that stand-off tube 70 deviates from adapter tube 60 is connected with plug connector 80, and the setting of plug connector 80 is used for connecting cable to be convenient for be connected with the signal record appearance through electric connector, carry out monitoring signal's transmission. The connecting wires 11 for connecting a plurality of detectors 10 are laid in the connecting pipe 40 through the fixing bracket 50, extend towards one end close to the adapter pipe 60, and then are laid on the inner wall of the adapter pipe 60, extend into the outlet pipe 70 through the adapter pipe 60 along the length of the adapter pipe 60, are laid on the inner wall of the outlet pipe 70, and are connected with the plug connectors 80 through the outlet pipe 70 along the length of the outlet pipe 70, so that the connecting wires 11 and the plug connectors 80 are connected with cables and electric connectors, and finally are electrically connected with a signal recorder to keep the transmission of signals.
As shown in fig. 1, 2 and 4, in an alternative embodiment, the neutron and temperature monitoring device in the nuclear power plant further includes a transition pipe 90, and the transition pipe 90 is connected between the connection pipe 40 and the adapter pipe 60. In practical use, the transition pipe 90 is disposed between the connection pipe 40 and the adapter pipe 60, and the transition pipe 90 plays a role in transition between the adapter pipe 60 and the connection pipe 40, so that the connection wires 11 can extend from the connection pipe 40 into the adapter pipe 60 through the transition pipe 90, and finally extend to the plug connector 80 along the adapter pipe 60 and the outlet pipe 70. The transition pipe 90 can be fixedly connected with the connecting pipe 40 during the distribution of argon arc welding, and can also be fixedly connected with the adapter pipe 60 in an argon arc welding manner.
As shown in fig. 1, 2 and 4, in an alternative embodiment, the neutron and temperature monitoring apparatus in a nuclear power plant further includes a fixture sleeve 100, a first seal 110 and a second seal 120; the fixing sleeve 100 is fixedly arranged in the adapter tube 60, the first sealing element 110 is arranged on the adapter tube 60 and is positioned at one end of the fixing sleeve 100 departing from the connecting tube 40, and the second sealing element 120 is arranged in the adapter tube 60 and is connected with the first sealing element 110. Specifically, fixed cover 100 is installed in switching pipe 60, and the setting of fixed cover 100 mainly used fixed connection wire 11 to connecting wire 11 can cover relatively switching pipe 60 and establish stably, thereby reduces connecting wire 11 and appears mixed and disorderly hidden danger because of external factors or because of the winding displacement operation is not smooth. Meanwhile, the arrangement of the fixing sleeve 100 can improve the shock resistance of the adapter tube 60. In actual use, since it is necessary to ensure the sealing property at the connection point between the connection pipe 40 and the adapter pipe 60, the first seal 110 and the second seal 120 are attached to the adapter pipe 60, the first seal 110 is attached to the inner wall of the adapter pipe 60 and is sealingly connected to the adapter pipe 60, and the second seal 120 is attached to the connection pipe 40 and is sealingly connected to the first seal 110. The first sealing member 110 has a first through hole so that the second sealing member 120 can be inserted into the first through hole to achieve a sealing connection therebetween. A passage for the connection lead 11 to pass through is provided between the second sealing member 120 and the first sealing member 110, but the provision of the passage does not affect the sealing performance therebetween. In actual use, the first sealing element 110 and the second sealing element 120 are arranged to divide the adapter tube 60 into two parts, namely a first section for connecting the transition tube 90 and a second section for connecting the outlet tube 70, wherein the first section is used for being inserted into the reactor when neutron fluence monitoring is performed, and the second section is located outside the reactor. A typical reactor is located inside a pressure vessel so that the first section is inserted into the pressure vessel and the second section is located outside the pressure vessel. The first sealing element 110 is fixed relative to the fixing sleeve 100 by high-frequency induction welding, and the first sealing element 110 and the second sealing element 120 are welded and fixed by argon arc welding.
As shown in fig. 1, 2 and 4, in an alternative embodiment, the neutron and temperature monitoring device in the nuclear power plant further includes a corrugated pipe 130, and the corrugated pipe 130 is connected between the extraction pipe 70 and the plug-in connector 80. Specifically, the corrugated tube 130 is further provided between the plug 80 and the extraction tube 70, and the flexibility of the neutron and temperature monitoring device in the nuclear power plant can be increased by utilizing the flexibility of the telescopic property of the corrugated tube 130. The corrugated tube 130 and the lead-out tube 70 are fixed by laser welding to ensure the integrity of the seal.
As shown in fig. 1, 2 and 4, in an alternative embodiment, the neutron and temperature monitoring apparatus in a nuclear power plant further includes a mounting tube 140, and the mounting tube 140 is connected between the bellows 130 and the plug 80. The installation pipe 140 is arranged for transitionally connecting the plug connector 80 and the corrugated pipe 130, the installation pipe 140 and the corrugated pipe 130 are connected in a laser welding mode, the plug connector 80 is used for connecting a cable, and the plug connector 80 and the installation pipe 140 are welded and sealed in a laser welding mode. In actual use, the exit tube 70 may also be part of a tube that is inserted into the reactor pressure vessel.
As shown in fig. 1, 2 and 4, in an alternative embodiment, the neutron and temperature monitoring device in the nuclear power plant further includes a sealing plug 150, and the sealing plug 150 is installed at one end of the long pipe extending into the reactor. The sealing plug 150 is used in cooperation with the first sealing member 110 and the second sealing member 120, so as to ensure the sealing performance in the adapter tube 60, the transition tube 90 and the connection tube 40. When the neutron and temperature monitoring device of the nuclear power plant is partially inserted into a pressure vessel of a reactor, the first sealing element 110, the second sealing element 120 and the sealing plug 150 are arranged, so that the sealing performance of the neutron and temperature monitoring device of the nuclear power plant is improved, and the operation safety of the reactor is improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A nuclear power station neutron and temperature monitoring device is characterized by comprising a plurality of detectors (10), a sensor (20), a compensation core wire (30), a connecting pipe (40), an electric connector and a signal recorder;
the sensor (20), the compensation core wire (30) and the plurality of detectors (10) are all arranged in the connecting pipe (40), and the plurality of detectors (10) are arranged around the axis of the connecting pipe (40) at intervals; the detectors (10) which are adjacent to each other are connected end to end, the sensor (20) and the compensation core wire (30) are connected to the detectors (10), and the length of the compensation core wire (30) is the same as that of the detectors (10); one end of the connecting pipe (40) is used for extending into the reactor, the other end of the connecting pipe (40) is connected with the signal recorder through the electric connector, the detector (10) is used for monitoring neutron signals, the compensation core wire (30) is used for generating an interference signal, and the sensor (20) is used for monitoring the temperature at the outlet of the reactor core coolant;
the neutron and temperature monitoring device for the nuclear power station further comprises a fixing support (50), the fixing support (50) is installed inside the connecting pipe (40), and the detectors (10) are installed on the fixing support (50);
the fixing bracket (50) comprises a liner tube (51), a liner tube connecting piece (52) and a fixing tube (53);
the liner pipe (51) is laid on the inner wall of the connecting pipe (40), at least part of the fixed pipe (53) is inserted into the liner pipe (51), and the liner pipe connecting piece (52) is connected between the liner pipe (51) and the connecting pipe (40); a plurality of the probes (10) and the compensation core wires (30) are mounted to the fixed tube (53);
the neutron and temperature monitoring device for the nuclear power station further comprises a transfer pipe (60), a lead-out pipe (70) and a plug connector (80);
the adapter tube (60), the leading-out tube (70) and the plug connector (80) are sequentially connected end to end, one end of the adapter tube (60) departing from the plug connector (80) is used for being connected with one end of the connecting tube (40) departing from the reactor, and the plug connector (80) is used for connecting a cable;
the neutron and temperature monitoring device for the nuclear power station further comprises a fixed sleeve (100), a first sealing element (110) and a second sealing element (120);
the fixing sleeve (100) is fixedly arranged in the adapter tube (60), the first sealing element (110) is arranged on the adapter tube (60) and is positioned at one end, deviating from the connecting tube (40), of the fixing sleeve (100), and the second sealing element (120) is arranged in the adapter tube (60) and is connected with the first sealing element (110).
2. The nuclear power plant neutron and temperature monitoring device according to claim 1, further comprising a connecting wire (11), wherein each detector (10) is connected to the connecting wire (11), the connecting wire (11) is disposed in the connecting pipe (40), and the connecting wire (11) and the connecting pipe (40) can synchronously extend into a reactor.
3. The nuclear power plant neutron and temperature monitoring device of claim 1, wherein the detector (10) is a vanadium neutron detector.
4. The nuclear power plant neutron and temperature monitoring device of claim 1, further comprising a transition tube (90), wherein the transition tube (90) is connected between the connection tube (40) and the adapter tube (60).
5. The nuclear power plant neutron and temperature monitoring device of claim 1, wherein the first seal (110) is mounted to an inner wall of the adapter tube (60) and is in sealing connection with the adapter tube (60), and the second seal (120) is mounted within the connector tube (40) and is in sealing connection with the first seal (110).
6. The nuclear power plant neutron and temperature monitoring device of claim 1, further comprising a corrugated tube (130), the corrugated tube (130) being connected between the pigtail (70) and the plug (80).
7. The nuclear power plant neutron and temperature monitoring device of claim 6, further comprising a mounting tube (140), the mounting tube (140) being connected between the bellows (130) and the plug (80).
8. The nuclear power plant neutron and temperature monitoring device according to any one of claims 1 to 7, further comprising a sealing plug (150), wherein the sealing plug (150) is mounted at one end of the connecting pipe (40) extending into the reactor.
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