Criticality detection device and nuclear facility

Abstract

The present invention discloses a critical detection device, which includes a detector and a sleeve. The sleeve is embedded in a mounting hole reserved on the wall of a high-dose room, and includes a blind end and an open end. The blind end faces the interior of the high-dose room, and the open end is connected to the outside of the high-dose room. The detector is arranged in the sleeve to detect the radiation level inside the high-dose room. The present invention also discloses a nuclear facility. The present invention can reduce false alarms and extend service life, and is very suitable for critical monitoring of high-dose rooms.

Description

Technical Field

[0001] The invention belongs to the field of nuclear technology, and in particular relates to a criticality detection device and a nuclear facility. Background Art

[0002] There are usually some rooms with high radiation levels inside nuclear facilities. These rooms with high radiation doses are equipped with a large number of equipment and may have criticality risks. In the past, monitoring of criticality risks in such rooms was generally completed through criticality detection instruments arranged in the room. However, due to the high background radiation level in the room, false alarms are very likely to occur and the life of criticality detection instruments is greatly reduced. In addition, it is inconvenient for personnel to enter and exit the room, and it is difficult to replace damaged criticality detection equipment and instruments. Installation and maintenance are difficult and the radiation risk is high. In addition, the replaced and disassembled criticality detection instruments are seriously contaminated and must be treated as radioactive waste, which increases the pressure on radioactive waste management. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a criticality detection device and a nuclear facility in view of the above-mentioned deficiencies in the prior art, which can reduce false alarms, extend the service life, and is very suitable for criticality monitoring in high-dose rooms.

[0004] The technical solution of the present invention to solve the above technical problems is:

[0005] According to one aspect of the present invention, a criticality detection device is provided, and its technical solution is as follows:

[0006] A critical detection device comprises a detector and a sleeve. The sleeve is embedded in a mounting hole reserved on the wall of a high-dose room, and comprises a blind end and an open end. The blind end faces the interior of the high-dose room, and the open end is connected to the outside of the high-dose room. The detector is arranged in the sleeve to detect the radiation level inside the high-dose room.

[0007] Preferably, the device further comprises a shielding plug, which seals the open end of the sleeve.

[0008] Preferably, the inner wall of the sleeve is stepped along its length.

[0009] Preferably, the sleeve includes a first step section and a second step section, the first step section is connected to the second step section, the first step section is close to the opening end, and the second step section is close to the blind end, the detector is arranged in the first step section, and the shielding plug is sealed in the second step section.

[0010] Preferably, the sleeve includes a first step section and a second step section, the first step section is connected to the second step section, the first step section is close to the opening end, and the second step section is close to the blind end, the detector is arranged in the first step section, the shielding plug is sealed in the second step section, and the front end of the shielding plug extends into the first step section.

[0011] Preferably, the inner holes of the first step section and the second step section are both cylindrical, and the inner hole diameter of the first step section is smaller than the inner hole diameter of the second step section.

[0012] Preferably, the shape of the detector is matched to the shape of the inner hole of the first step section.

[0013] Preferably, a slot is provided on the side wall of the shielding plug, and the slot is spiral or curved and is used for laying a signal cable connected to the detector.

[0014] According to another aspect of the present invention, a nuclear facility is provided, and its technical solution is as follows:

[0015] A nuclear facility comprises a high-dose room and the above-mentioned critical detection device, wherein an installation hole is reserved on the wall of the high-dose room, and the end of the installation hole facing the interior of the high-dose room is closed, and the sleeve in the critical detection device is embedded in the installation hole.

[0016] Compared with the prior art, the criticality detection device and nuclear facility of the present invention have at least the following beneficial effects:

[0017] 1) The installation area is located outside the high-dose room, and the detector does not directly enter the high-dose room. The radiation background level at the location of the detector is low, which can effectively reduce the risk of false alarms and extend the service life of the detector. In addition, the impact on the process layout inside the high-dose room can be minimized, reducing the danger of construction;

[0018] 2) Easy installation and maintenance. The detector only needs to be inserted and pulled out of the sleeve. The detector can be repaired and replaced at any time, which greatly reduces the difficulty of installation and maintenance and the risk of exposure to personnel during work;

[0019] 3) It can prevent the detectors from being contaminated by the radioactive atmosphere in the high-dose room. The replaced detectors are not contaminated, which can reduce the management pressure of radioactive waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a criticality detection device in an embodiment of the present invention;

[0021] In the figure: 1-sleeve; 11-first step section; 12-second step section; 2-detector; 3-shielding plug. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figure 1 As shown, this embodiment discloses a critical detection device for critical monitoring of a high-dose room, which includes a sleeve 1 and a detector 2. The sleeve 1 is embedded in a mounting hole reserved on the wall of the high-dose room. The sleeve 1 includes a blind end and an open end. The blind end faces the interior of the high-dose room and is used to isolate the radioactive atmosphere inside the high-dose room. The detector 2 is arranged in the sleeve 1 and is used to detect the radiation level inside the high-dose room. The open end is connected to the outside of the high-dose room to facilitate installation, maintenance and other operations on the detector.

[0028] Specifically, the depth of the installation hole is matched with the length of the sleeve 1, and the installation hole is a blind hole, that is, the installation hole does not dig through the wall of the high-dose room, and a part of the wall is retained. The installation hole is not connected to the interior of the high-dose room. After the sleeve 1 is embedded in the installation hole, the remaining space between the sleeve 1 and the installation hole is backfilled. The blind end of the sleeve 1 cooperates with the retained part of the wall to isolate the radioactive atmosphere inside the high-dose room, prevent the detector from being contaminated by the radioactive atmosphere and prevent the leakage of radioactive aerosols inside the high-dose room. In addition, the retained part of the wall can reduce the radiation background level received by the front sensitive area of ​​the detector, effectively reducing the occurrence of false alarms.

[0029] In some embodiments, the device further comprises a shielding plug 3, which is sealed on the open end of the sleeve 1 to supplement the shielding effect of the wall removed due to the reserved installation hole, thereby ensuring the radiation safety of personnel.

[0030] In some embodiments, the inner wall of the sleeve 1 is stepped along its length.

[0031] Specifically, along the length direction of the sleeve 1, the sleeve 1 includes a first step section 11 and a second step section 12, the first step section 11 is connected to the second step section 12, and the first step section 11 is close to the open end, and the second step section 12 is close to the blind end, the detector 2 is arranged in the first step section 11, the shielding plug 3 is blocked in the second step section 12, and, as Figure 1 As shown, the front end of the shielding plug 3 can also extend into the first step section 11 , that is, the front end of the shielding plug 3 is adapted to the size of the first step section 11 .

[0032] In some embodiments, the inner holes of the first step segment 11 and the second step segment 12 are both cylindrical, and the inner hole diameter of the first step segment 11 is smaller than the inner hole diameter of the second step segment 12 .

[0033] Of course, the inner holes of the first step section 11 and the second step section 12 may also be any other shape besides cylindrical, which will not be described in detail here.

[0034] In some embodiments, the shape and size of the detector 3 match the shape and size of the first step section 11 , and the two fit tightly together.

[0035] In some embodiments, a slot (not shown) is provided on the side wall of the shielding plug 3 for laying a signal cable connected to the detector 2. Moreover, the slot is not a straight slot, but has a certain spiral or curved structure, that is, the slot is preferably spiral or curved to ensure that the radiation beam in the high-dose room has no straight through path at any position of the shielding plug, thereby reducing the risk of radiation.

[0036] It should be noted that, in addition to being applicable to critical monitoring of high-dose rooms, the device of this embodiment can also be used for critical monitoring of other types of rooms other than high-dose rooms.

[0037] The critical detection device of this embodiment is a cylindrical wall-embedded critical detection device, which has at least the following advantages over the prior art:

[0038] 1) The installation area is located outside the high-dose room, and the detector does not directly enter the high-dose room. The radiation background level at the location of the detector is low, which can effectively reduce the risk of false alarms and extend the service life of the detector. In addition, the impact on the process layout inside the high-dose room can be minimized, reducing the danger of construction;

[0039] 2) Easy installation and maintenance. Only the detector and shielding plug need to be inserted and pulled out of the sleeve. The detector can be repaired and replaced at any time, which greatly reduces the difficulty of installation and maintenance and the risk of exposure to personnel during work.

[0040] 3) It can prevent the detectors from being contaminated by the radioactive atmosphere in the high-dose room. The replaced detectors are not contaminated, which can reduce the management pressure of radioactive waste.

[0041] Example 2

[0042] This embodiment discloses a nuclear facility, including a high-dose room and the critical detection device described in Example 1. An installation hole is reserved on the wall of the high-dose room, and the end of the installation hole facing the interior of the high-dose room is closed. The sleeve 1 in the critical detection device is embedded in the installation hole.

[0043] The nuclear facility of this embodiment can effectively reduce the risk of false alarms and extend the service life of detectors, and can minimize the impact on the process layout inside the high-dose room, thereby reducing the risk of construction. In addition, the detectors are easy to install and maintain, and the detectors will not be contaminated by the radioactive atmosphere in the high-dose room. The replaced detectors are not contaminated, which can reduce the management pressure of radioactive waste.

[0044] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A criticality detection device, characterized in that: It comprises a detector (2), a sleeve (1), The sleeve is embedded in a mounting hole reserved on the wall of the high-dose room, and comprises a blind end and an open end, wherein the blind end faces the interior of the high-dose room, and the open end is communicated with the exterior of the high-dose room; The depth of the installation hole is adapted to the length of the sleeve, and the installation hole is a blind hole on the wall, which is not connected to the interior of the high-dose room; The detector is disposed in the sleeve and is used to detect the radiation level inside the high-dose room; The device further comprises a shielding plug (3), the shielding plug sealing the open end of the sleeve; The inner wall of the sleeve (1) is stepped along its length direction; The sleeve comprises a first step section (11) and a second step section (12), the first step section is connected to the second step section, the first step section is close to the blind end, and the second step section is close to the open end, the detector is arranged in the first step section, the shielding plug is sealed in the second step section, and the inner hole diameter of the first step section is smaller than the inner hole diameter of the second step section.

2. The criticality detection device according to claim 1, characterized in that: The front end of the shielding plug extends into the first step section.

3. The criticality detection device according to claim 1 or 2, characterized in that: The inner holes of the first step section (11) and the second step section (12) are both cylindrical.

4. The criticality detection device according to claim 1 or 2, characterized in that: The shape of the detector (2) is adapted to the shape of the inner hole of the first step section (11).

5. The criticality detection device according to claim 1 or 2, characterized in that: A slot is provided on the side wall of the shielding plug (3), and the slot is spiral or curved and is used for laying a signal cable connected to the detector.

6. A nuclear facility, comprising a high-dose room, characterized in that: Also includes the criticality detection device according to any one of claims 1 to 5, An installation hole is reserved on the wall of the high-dose room, and one end of the installation hole facing the interior of the high-dose room is closed, and the sleeve (1) in the critical detection device is embedded in the installation hole.

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