CN219778533U - Neutron fluence rate monitoring system - Google Patents
Neutron fluence rate monitoring system Download PDFInfo
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- CN219778533U CN219778533U CN202320184439.9U CN202320184439U CN219778533U CN 219778533 U CN219778533 U CN 219778533U CN 202320184439 U CN202320184439 U CN 202320184439U CN 219778533 U CN219778533 U CN 219778533U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 36
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- 229910001069 Ti alloy Inorganic materials 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
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- 239000000463 material Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000005855 radiation Effects 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 15
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Abstract
The utility model relates to the technical field of nuclear radiation monitoring, in particular to a neutron fluence rate monitoring system, which comprises a detector assembly, a fixed hook, a hanging and lifting device and a control processing cabinet, wherein: the hanging and hoisting device comprises a hoisting bracket, an electric winch and a controller, wherein the electric winch and the controller are fixed on the hoisting bracket; a coaxial organic cable is wound on the electric winch, one end of the coaxial organic cable is connected with the detector assembly, and the other end of the coaxial organic cable is connected with the control processing cabinet; the detector component is fixed on the wall of the primary loop water tank through the fixed hook and is used for monitoring the neutron fluence rate and the change condition of the neutron fluence rate at the core position when the reactor is charged for the first time. The utility model reduces the influence of Y rays on the detection result, greatly reduces the weight of the detector assembly, reduces the mounting and dismounting difficulties, improves the mounting and recycling efficiency and increases the safety of the system.
Description
Technical Field
The utility model relates to the technical field of nuclear radiation monitoring, in particular to a neutron fluence rate monitoring system.
Background
The primary loading monitoring system of the nuclear power station is mainly used for monitoring the neutron fluence rate and the change of the reactor core through the system in the primary loading process of the reactor, and because fewer neutrons are released from components in the loading process, and a source range channel of the off-core measuring system is a certain distance away from the reactor core, in order to more accurately reflect the state of the reactor core, a temporary detector is needed to be arranged in the reactor core so as to ensure that critical and supercritical accidents do not occur in the primary loading process of the reactor, and the safety of the primary loading of the reactor is ensured. In case of accident, the system gives out alarm signal to make the operators take necessary measures to ensure the safety of the reactor and the timely evacuation of the organization personnel.
The reactor has high gamma radiation in the charging process, and the cumulative absorption dose during the charging process can reach 10 5 Therefore, the nuclear power plant generally requires the primary charge monitoring device to take measures to reduce the influence of gamma rays, and the proportion of gamma signals in the total signals is less than 20%. The existing primary charge monitoring system detector mostly adopts a single detector 3 He proportional counter tube or 10 And the sensitivity of the two detectors to gamma radiation is higher, and lead shielding is required to be added during engineering application to reduce the influence of gamma radiation, but the risk that the weight of the detector is increased and the detector is not easy to install and use is brought.
Disclosure of Invention
The utility model provides a neutron fluence rate monitoring system, which adopts a compensation method to reduce the influence of gamma rays and has higher detection accuracy.
In order to achieve the above object, the present utility model provides a neutron fluence rate monitoring system, comprising a detector assembly, a fixed hook, a hanging and hoisting device and a control processing cabinet, wherein: the hanging and hoisting device comprises a hoisting bracket, an electric winch and a controller, wherein the electric winch and the controller are fixed on the hoisting bracket; a coaxial organic cable is wound on the electric winch, one end of the coaxial organic cable is connected with the detector assembly, and the other end of the coaxial organic cable is connected with the control processing cabinet; the detector component is fixed on the wall of the primary loop water tank through the fixed hook and is used for monitoring the neutron fluence rate and the change condition of the neutron fluence rate at the core position when the reactor is charged for the first time, and transmitting corresponding signals to the control processing cabinet through the coaxial cable for human-computer interaction.
Further, the detector assembly includes end cover, cavity, shell, watertight stuffing box, count pipe and pressure sensor, wherein: the end cover is connected with the shell, the end cover is arranged at the top of the cavity, and the shell surrounds the outside of the cavity; the watertight stuffing box is arranged at the top of the cavity and positioned in the end cover, and is connected with the coaxial cable; the counting tube is arranged in the cavity and used for outputting neutron monitoring signals; the pressure sensor is arranged at the center of the cavity and fixed on the outer wall of the shell.
Further, the counting tube comprises 3 He proportional counter tube 4 He compensates for the counter tube, 3 he proportional counter tube 4 He compensation counting tubes are arranged in the cavity side by side, 3 he proportional counter tubes are sensitive to neutrons and gamma rays at the core location, 4 he compensation tubes are sensitive only to gamma rays at the core location.
Further, the device also comprises a heavy hammer which is arranged at the bottom of the cavity.
Further, the control processing rack includes measurement channel machine case, audible and visual alarm module, pulser and paperless record appearance, wherein: the measuring channel case is respectively connected with the audible and visual alarm module, the pulse generator and the paperless recorder; the measuring channel case is used for processing signals transmitted by the detector assembly and transmitting processing results.
Further, the material of the shell is titanium alloy.
The neutron fluence rate monitoring system provided by the utility model has the following beneficial effects:
the utility model adopts 4 The He compensation counting tube replaces the traditional lead skin, reduces the influence of gamma rays on detection results, adopts titanium alloy materials for the shell, removes lead shielding, greatly reduces the weight of a detector assembly, reduces the mounting and dismounting difficulty, improves the mounting and recycling efficiency, measures the depth of the detector assembly in a primary water tank in real time through a pressure sensor, greatly improves the mounting precision, realizes full-automatic operation through a control cabinet and a motor, reduces the labor force during mounting and dismounting, and increases the safety of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the utility model and are not to be construed as unduly limiting the utility model. In the drawings:
FIG. 1 is a schematic diagram of a neutron fluence rate monitoring system provided according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a detector assembly of a neutron fluence rate monitoring system provided in accordance with an embodiment of the utility model;
in the figure: 1-detector assembly, 11-end cap, 12-watertight stuffing box, 13-housing, 14- 3 He proportional counter tube, 15-pressure sensor and 16- 4 He compensation counting tube, 17-weight, 18-cavity, 2-fixed hook, 3-hoisting bracket, 4-electric capstan, 5-control processing cabinet.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the utility model herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present utility model will be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the utility model provides a neutron fluence rate monitoring system, which comprises a detector assembly 1, a fixed hook 2, a hanging and hoisting device and a control processing cabinet 5, wherein: the hanging and hoisting device comprises a hoisting bracket 3, an electric winch 4 and a controller, wherein the electric winch 4 and the controller are fixed on the hoisting bracket 3; a coaxial organic cable is wound on the electric winch 4, one end of the coaxial organic cable is connected with the detector assembly 1, and the other end of the coaxial organic cable is connected with the control processing cabinet 5; the detector assembly 1 is fixed on the wall of the primary loop water tank through the fixed hook 2 and is used for monitoring the neutron fluence rate and the change condition of the neutron fluence rate at the core position when the reactor is charged for the first time and transmitting corresponding signals to the control processing cabinet 5 through the coaxial cable for human-computer interaction.
Specifically, the neutron fluence rate monitoring system provided by the embodiment of the utility model is mainly used for monitoring the neutron fluence rate and the change condition of the neutron fluence rate at the core position when the reactor is charged for the first time, and in the detection process, the influence of gamma rays is reduced by adopting a compensation method, so that the detection accuracy is improved. The hanging and lifting device is mainly used for lifting the detector assembly 1, in the lifting process, according to actual conditions, the electric winch 4 is controlled to rotate through the controller on the lifting support 3, lifting of the detector assembly 1 is achieved under the drive of the electric winch 4 and the coaxial organic cable, the controller can be connected with the control processing cabinet 5, and control of the controller can be achieved through the control processing cabinet 5; after the detector component 1 is hoisted to a detection position, the detector component is fixed on the wall of the primary loop water tank through the fixed hook 2; after the fixation is completed, the detector assembly 1 can monitor the neutron fluence rate and the change condition of the neutron fluence rate at the core position when the reactor in the pool is charged for the first time, and generate corresponding monitoring signals, the monitoring signals are transmitted to the control processing cabinet 5 through the coaxial cable, the control processing cabinet 5 can analyze and process the monitoring signals to obtain the neutron fluence rate and the change curve of the neutron fluence rate, and the obtained results are recorded and displayed.
Further, as shown in fig. 2, the probe assembly 1 comprises an end cap 11, a cavity 18, a housing 13, a watertight stuffing box 12, a counter tube and a pressure sensor 15, wherein: the end cover 11 is connected with the shell 13, the end cover 11 is arranged at the top of the cavity 18, and the shell 13 surrounds the outside of the cavity 18; the watertight stuffing box 12 is arranged at the top of the cavity 18 and positioned inside the end cover 11, and the watertight stuffing box 12 is electrically connected with the coaxial cable; the counting tube is arranged in the cavity 18 and is used for outputting neutron monitoring signals; the pressure sensor 15 is disposed at the center of the cavity 18 and fixed to the outer wall of the housing 13. The detector assembly 1 is arranged in a reactor in a pool and is mainly used for monitoring neutron fluence rate and change conditions of the neutron fluence rate at the position of the reactor core when the reactor is charged for the first time, the detector assembly 1 is a hollow cylinder as a whole and comprises a watertight stuffing box 12 arranged at the top of a cavity 18 and a counting tube arranged in the middle part of the cavity 18, the watertight stuffing box 12 is used for clamping a coaxial organic cable, and the counting tube is connected with the clamped coaxial organic cable and is used for outputting neutron monitoring signals; the end cover 11 is arranged outside the watertight stuffing box 12 and is used for protecting the sealing of one end head of the coaxial cable and the watertight stuffing box 12; the pressure sensor 15 is arranged at the center of the detector assembly 1 and is fixed on the outer wall of the shell 13 and used for giving the depth of the detector assembly 1 in a pool, and the distance between the detector assembly 1 and the water surface can be obtained in real time through pressure data fed back by the pressure sensor 15 in the lifting process of the detector assembly 1, so that the lifting precision is increased.
Further, the counting tube comprises 3 He proportional counter tube 14 4 He compensates for the counter tube 16, 3 he proportional counter tube 14 4 He compensation count pipe 16 is disposed side by side inside cavity 18, 3 he proportional counter tube 14 is sensitive to neutrons and gamma rays at the core location, 4 the He compensation counter tube 16 is sensitive to gamma rays at the core position only, and after the two proportional counter tubes 14 are connected side by side, a net neutron signal can be output, so that the compensation effect of the gamma rays is realized, and the influence of the gamma rays on detection is reduced.
Further, the device also comprises a heavy hammer 17, wherein the heavy hammer 17 is arranged at the bottom of the cavity 18. The weight 17 is arranged at the bottom of the cavity 18, is mainly used for balancing weight, and is arranged according to the actual weight of the detector assembly 1, so that the detector assembly 1 can stably descend in the pool.
Further, the control processing cabinet 5 includes a measurement channel cabinet, an audible and visual alarm module, a pulse generator and a paperless recorder, wherein: the measuring channel case is respectively connected with the audible and visual alarm module, the pulse generator and the paperless recorder; the measurement channel chassis is used for processing signals transmitted by the detector assembly 1 and transmitting processing results.
Specifically, the embodiment of the utility model realizes full-automatic operation by controlling the processing cabinet 5, reduces labor force during installation and disassembly, and increases the safety of the system. The measuring channel case adopts the existing control processing system, and is mainly used for carrying out signal amplification, discrimination shaping, signal conversion and transmission, neutron pulse counting, threshold comparison and alarm signal output on neutron signals output by the detector assembly 1; after the measurement channel chassis is processed, a withdrawal alarm signal with high neutron fluence rate is sent to an audible and visual alarm module, and the audible and visual alarm module alarms according to the corresponding signal; the pulse generator is used for generating pulse signals used for controlling the test of the processing cabinet 5; the paperless recorder is used for displaying the neutron counting rate output by the measuring channel chassis in a centralized mode and automatically recording the historical value. In addition, other control processing modules can be arranged in the control processing cabinet 5 according to the actual monitoring condition.
Further, the material of the housing 13 is titanium alloy. The shell 13 of the detector assembly 1 is made of titanium alloy, so that lead shielding is omitted, the influence of gamma rays on detection results is reduced, the weight of the detector assembly 1 is greatly reduced, the mounting and dismounting difficulties are reduced, and the mounting and recycling efficiency of the detector assembly 1 is improved.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (6)
1. The utility model provides a neutron fluence rate monitoring system which characterized in that, includes detector assembly, fixed couple, hangs hoist device and control processing rack, wherein:
the hanging and hoisting device comprises a hoisting bracket, an electric winch and a controller, wherein the electric winch and the controller are fixed on the hoisting bracket;
a coaxial organic cable is wound on the electric winch, one end of the coaxial organic cable is connected with the detector assembly, and the other end of the coaxial organic cable is connected with the control processing cabinet;
the detector component is fixed on the wall of the primary loop water tank through a fixed hook and is used for monitoring the neutron fluence rate and the change condition of the neutron fluence rate at the core position when the reactor is charged for the first time, and transmitting corresponding signals to the control processing cabinet through the coaxial cable and the computer to perform man-machine interaction.
2. The neutron fluence rate monitoring system of claim 1, wherein the detector assembly comprises an end cap, a cavity, a housing, a watertight stuffing box, a counter tube, and a pressure sensor, wherein:
the end cover is connected with the shell, the end cover is arranged at the top of the cavity, and the shell surrounds the outside of the cavity;
the watertight stuffing box is arranged at the top of the cavity and is positioned in the end cover, and the watertight stuffing box is connected with the coaxial cable;
the counting tube is arranged in the cavity and is used for outputting neutron monitoring signals;
the pressure sensor is arranged at the center of the cavity and fixed on the outer wall of the shell.
3. The neutron fluence rate monitoring system of claim 2, wherein the counting tube comprises 3 He proportional counter tube 4 He compensation counting tube, said 3 He proportional counter tube 4 He compensation counter tubes are arranged in the cavity side by side, the 3 He proportional counter tube to core positionWhere neutrons and gamma rays are sensitive, said 4 He compensation tubes are sensitive only to gamma rays at the core location.
4. The neutron fluence rate monitoring system of claim 2, further comprising a weight disposed at the bottom of the cavity.
5. The neutron fluence rate monitoring system of claim 1, wherein the control processing cabinet comprises a measurement channel chassis, an audible-visual alarm module, a pulser, and a paperless recorder, wherein:
the measuring channel case is respectively connected with the audible and visual alarm module, the pulse generator and the paperless recorder;
the measuring channel chassis is used for processing signals transmitted by the detector assembly and transmitting processing results.
6. The neutron fluence rate monitoring system of claim 2, wherein the material of the housing is a titanium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320184439.9U CN219778533U (en) | 2023-01-27 | 2023-01-27 | Neutron fluence rate monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320184439.9U CN219778533U (en) | 2023-01-27 | 2023-01-27 | Neutron fluence rate monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219778533U true CN219778533U (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320184439.9U Active CN219778533U (en) | 2023-01-27 | 2023-01-27 | Neutron fluence rate monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219778533U (en) |
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2023
- 2023-01-27 CN CN202320184439.9U patent/CN219778533U/en active Active
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