KR20220060417A - Radiation detector shielding apparatus for reactor coolant leak detection - Google Patents

Abstract

A shielding apparatus for detecting leakage of a nuclear reactor coolant of the present invention, disclosed herein, comprises: a shielding unit including a cavity, in which steam containing a coolant leaking from a primary cooling system of a nuclear reactor is collected, and at least one detection member for detecting radiation from the steam collected in the cavity, and providing a shielded space; a detachable partition unit configured to seal between the cavity and the detection member; a support unit which supports the shielding unit so that the shielding unit is prevented from moving by the external force; and a upholding unit which is formed of an insulating material that attenuates the noise of the detection member and on which the shielding unit is placed. The shielding apparatus for detecting leakage of a nuclear reactor coolant is provided in the same space as the primary cooling system. According to this configuration, detection integrity of the coolant, leaking from the primary cooling system, can be improved.

Description

RADIATION DETECTOR SHIELDING APPARATUS FOR REACTOR COOLANT LEAK DETECTION

The present invention relates to a radiation detector shielding device for detecting a coolant leak in a nuclear reactor, and to a radiation detector shielding device for detecting a coolant leak in a nuclear reactor that provides a shielding space capable of improving the detection soundness of coolant leaking from a primary cooling system of a nuclear reactor will be.

In a typical nuclear power plant, a scintillator detector is used to detect the leakage of reactor coolant to the secondary cooling system due to the breakage of the heat pipe of the primary cooling system steam generator. The scintillator detector installed near the chief complaint engine of the secondary cooling system detects gamma rays emitted from ¹⁶ N, which account for a significant amount of radionuclides generated by neutron radiation from the reactor vessel. Here, in the detection of radiation by the scintillator detector, a shielding means including lead is sometimes required to prevent signal interference by background radiation.

On the other hand, the cooling water leakage detection is installed in the secondary cooling system area with less background radiation, so the shielding means is simple in configuration and only the cooling water leakage between the primary and secondary cooling systems can be detected. Therefore, ¹⁶ N, which accounts for the majority of radiation generated from the coolant leaking from the primary cooling system, has a short half-life, so the coolant leak detection accuracy is low.

Accordingly, in recent years, various studies have been continuously conducted to quickly and accurately detect the leakage of coolant generated from the primary cooling system.

Republic of Korea Patent Application No. 10-2013-00040076 Republic of Korea Patent Application No. 10-2011-0014086

It is an object of the present invention to provide a radiation detector shielding device for detecting a coolant leak in a nuclear reactor capable of improving coolant leak detection soundness by providing a shielded space for detecting coolant leak generated from a primary cooling system.

A radiation detector shielding device for detecting a coolant leak in a nuclear reactor according to the present invention for achieving the above object includes: a cavity in which steam containing coolant leaked from a primary cooling system of a nuclear reactor is collected; At least one sensing member for detecting radiation from the vapor is provided, and a shielding part providing a shielded space, a partition wall detachable to seal the cavity and the sensing member, and a support part supporting the shielding part so as not to flow from an external force And, it is provided with an insulating material that attenuates the noise of the sensing member, and includes a support part on which the shielding part is placed, and is provided in the same space as the primary cooling system.

In addition, the shielding unit includes a first shielding member made of a shielding material provided along an inner wall, a first shielding box having the cavity and a second shielding member provided along the inner wall, and facing the cavity The sensing member may include a second shielding box provided therein, the first and second shielding members may be made of a lead-containing shielding material, and the first and second shielding boxes may be separated from each other.

In addition, a plurality of the first shielding boxes are provided to have the cavities having different capacities and are replaceable, and the second shielding boxes are provided in plurality to include different types of sensing members, respectively, and at least one of the first shielding boxes is provided. may be replaceable.

In addition, the first and second shielding boxes have a hollow shape with both ends open, the partition wall portion is coupled to at least one end of the first and second shielding boxes, and an area facing the cavity is relatively A guide region having a thin thickness may be provided.

In addition, the shielding portion is provided with a shielding material containing lead (Pb), and the barrier rib portion includes at least one barrier rib made of a metal material including aluminum and stainless steel capable of attenuating radiation, wherein the cavity and The facing region may be provided with a guide region having a relatively thin thickness.

In addition, the support part includes a first support for supporting the outside of the shielding part so that the shielding part does not flow by an external force, and the inside of the shielding part so that the sensing member inside the shielding part does not flow by an external force It may include a second support for supporting the sensing member.

In addition, the support part includes a first support member in close contact with the lower outer peripheral surfaces of the first and second shielding boxes, and a second support member in close contact with the upper outer peripheral surfaces of the first and second shielding boxes, The second support member may include a first support that is fixed to the support part in a state of being coupled to each other, and a second support that is provided inside the second shield box with the sensing member coupled therein.

In addition, the second shielding box is closed by a cover having an opening communicating with the cavity provided at both ends, and having a cover protrusion inserted into the opening at an end not facing the cavity, and the second support is the It may be provided integrally with the cover protrusion.

In addition, the cover protrusion may be made of a shielding material including lead.

In addition, the second support may have an assembly hole through which the sensing member can enter and exit at one side, and a sealing member may be provided at a coupling portion between the second support and the sensing member.

In addition, the support part may include a support provided with an insulator for supporting the bottom of the shielding part.

A radiation detector shielding device for detecting a coolant leak in a nuclear reactor according to another preferred aspect of the present invention is provided in the same space as the primary cooling system of a nuclear reactor to provide a shielding space, and vapor containing the coolant leaked from the primary cooling system At least one first shield box in which a collecting cavity is provided, and at least one second shield that is adjacently connected to the first shield box to face the cavity and is provided with a sensing member for detecting radiation from the vapor A shielding part including a shielding box, a partition wall part detachably attached to seal between the first and second shielding boxes, a support part supporting the shielding part so that it does not flow from an external force, and an insulating material that attenuates the noise of the sensing member It is provided and includes a support part on which the shielding part is placed.

In addition, the first and second shielding boxes may be provided so that a shielding member made of a lead-containing shielding material is provided along each inner wall, and may be separated from each other in a closed state by the partition wall part.

In addition, a plurality of the first shielding boxes are provided to have the cavities having different capacities and are replaceable, and the second shielding boxes are provided in plurality to include different types of sensing members, respectively, and at least one of the first shielding boxes is provided. may be replaceable.

In addition, the first and second shielding boxes have a hollow shape with both ends open, the partition wall portion is coupled to at least one end of the first and second shielding boxes, and an area facing the cavity is relatively A guide region having a thin thickness may be provided.

In addition, the first and second shielding boxes are provided with a shielding material containing lead (Pb), and the barrier rib part includes at least one barrier rib made of a metal material including aluminum and stainless steel capable of attenuating radiation. However, a guide region having a relatively thin thickness may be provided in the region facing the cavity.

In addition, the support part may include a first supporter that is in close contact with the outer surfaces of the first and second shielding boxes, and a second supporter that supports the sensing member inside the second shielding box.

In addition, the first support includes a first support member in close contact with the lower outer peripheral surfaces of the first and second shield boxes and a second support member in close contact with the upper outer peripheral surfaces of the first and second shield boxes, the first and the second support member may be coupled to each other and fixed to the support part.

In addition, the second shielding box is closed by a cover having an opening communicating with the cavity provided at both ends, and having a cover protrusion inserted into the opening at an end not facing the cavity, and the second support is the It may be provided integrally with the cover protrusion.

In addition, the cover protrusion may be made of a shielding material including lead.

In addition, the second support may have an assembly hole through which the sensing member can enter and exit at one side, and a sealing member may be provided at a coupling portion between the second support and the sensing member.

In addition, the support part may include a support provided with an insulator for supporting the bottom of the shielding part.

According to the present invention having the above configuration, first, a radiation detector shielding device for detecting a coolant leak in a nuclear reactor is provided in the same space as the primary cooling system of a nuclear reactor, and primary cooling is performed inside the radiation detector shielding device for detecting a coolant leak in a nuclear reactor. It is possible to quickly and accurately detect coolant leaking from the system.

Second, by providing a shielded space capable of reducing interference with noise including background radiation, detection soundness can be secured.

Third, it is possible to separate and replace the shielding box in response to various conditions such as detection conditions and environment, which is advantageous in securing use diversity.

Fourth, it is possible to secure structural and functional safety by external force of the radiation detector shielding device for detecting leakage of the reactor coolant, and thus high-quality detection performance can be realized.

1 is a perspective view schematically illustrating a radiation detector shield for detecting a coolant leak in a nuclear reactor according to a preferred embodiment of the present invention.
FIG. 2 is an exploded perspective view schematically illustrating an exploded radiation detector shielding device for detecting a coolant leak in a nuclear reactor illustrated in FIG. 1 .
FIG. 3 is a schematic cross-sectional view taken along the line III-III shown in FIG. 1 .
FIG. 4 is a schematic cross-sectional view taken along line IV-IV shown in FIG. 1 .
FIG. 5 is a graph schematically illustrating a change in noise caused by background radiation according to the presence or absence of a radiation detector shielding device for detecting coolant leakage in a nuclear reactor illustrated in FIG. 1 . And,
FIG. 6 is a graph schematically comparing noise of background radiation generated from a sensing member according to the presence or absence of a radiation detector shielding device for detecting coolant leakage in the reactor shown in FIG. ¹ and a 16N radiation signal in the coolant by simulating it.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. However, the spirit of the present invention is not limited to such embodiments, and the spirit of the present invention may be differently proposed by adding, changing, and deleting components constituting the embodiment, but this is also included in the scope of the present invention. will become

1 is a perspective view schematically showing a radiation detector shielding device for detecting a coolant leak in a nuclear reactor 1 according to a preferred embodiment of the present invention, and FIG. 2 is a radiation detector shielding device for detecting a coolant leak in a nuclear reactor shown in FIG. 1) is an exploded perspective view schematically exploded. Also, FIGS. 3 and 4 are cross-sectional views taken along lines III-III and IV-IV shown in FIG. 1 , respectively.

1 and 2 , the radiation detector shielding device 1 for detecting leakage of a nuclear reactor coolant according to an embodiment of the present invention includes a shielding part 10 , a bulkhead part 40 , a support part 50 and a support part ( 60).

For reference, the radiation detector shielding device 1 for detecting coolant leakage in a nuclear reactor described in the present invention detects coolant leakage in the primary cooling system of a nuclear reactor (not shown) that generates a nuclear reaction, such as a nuclear power plant. More specifically, the radiation detector shielding device 1 for detecting a coolant leak in a nuclear reactor according to the present invention is a containment that is the same space as the primary cooling system of a nuclear reactor located inside a containment facility such as a water collecting tank or a containment building. It is exemplified and illustrated as being provided inside the facility, that is, the present invention is to provide a shielding space for detecting leakage of the coolant (C) inside the containment rather than outside the containment.

The shielding unit 10 is provided in the same space as the primary cooling system (not shown) of the nuclear reactor, and provides a shielded space in which the vapor C containing the coolant leaked from the primary cooling system (not shown) is collected. . To this end, the shielding unit 10 includes first and second shielding boxes 20 and 30 .

The first shielding box 20 is provided with a first shielding member 21 made of a shielding material such as lead (Pb) along the inner wall, and a cavity 22 in which vapor C is collected in the central region. provided inside. Here, both sides of the cavity 22 have an open shape, so that the first shield 20 has a hollow cylindrical shape with both ends open. On one side of the first shielding box 20, an inlet pipe 23 and an outlet pipe 24 through which steam (C) flows into and out of the cavity 22 are provided in parallel with each other, but the inlet pipe 23 and the outlet pipe ( 24) is not limited to the illustrated example.

For reference, the steam (C) flowing into and discharged from the cavity 22 of the first shielding box 20 is collected near the piping of the primary cooling system (not shown) and sucked into the cavity 22 . In addition, the first shielding box 20 may have an air pump (not shown) to circulate the steam C in and out of the cavity 22 .

The second shielding box 30 is provided with a second shielding member 31 made of a shielding material including lead (Pb) along the inner wall. In addition, the second shielding box 30 is provided to be connected to at least one of the first shielding boxes 20 so as to be adjacent to the first shielding box 20, and a sensing member 32 for detecting the coolant contained in the vapor (C). ) (see FIG. 2 ) is provided. To this end, the second shield box 30 is provided with openings 33 on both sides to face and communicate with the cavity 22 of the first shield box 20, and the sensing member 32 is installed therein. It has a hollow cylindrical shape in which a space is provided.

On the other hand, in this embodiment, as shown in FIG. 1 , the second shielding box 30 is shown and illustrated as being provided as a pair so as to face each other with the cavity 22 interposed therebetween on both sides of the first shielding box 20 . However, the number and installation positions of the second shielding box 30 are not limited. That is, the first shield box 20 can be variously deformed, such as a substantially rectangular parallelepiped shape, and the second shield box 30 corresponds to the shape of the first shield box 20 . Modifications provided to be connected to a plurality of locations at various locations such as side surfaces, upper surfaces, and lower surfaces are also possible.

Here, the number and installation positions of the second shielding box 30 may be varied according to the sensing characteristics of the sensing member 32 provided therein. For example, the second shielding box 30 is coupled to both sides of the first shielding box 20 as a pair, and beta rays and gamma rays of radiation can be detected inside the pair of second shielding boxes 30 , respectively. There may be provided different sensing members 32, respectively.

The first and second shield boxes 20 and 30 are provided in the same space as the isolated containment facility in which the primary cooling system (not shown) is provided. That is, the first and second shield boxes 20 and 30 are provided in the welcome hallway inside the containment facility where the primary cooling system (not shown) is placed, and are provided near the primary cooling system (not shown) to provide the primary A high-humidity steam (C) in which a coolant such as coolant leaked from the cooling system (not shown) is vaporized is introduced. In this case, the first and second shielding boxes 20 and 30 are provided with a shielding material such as lead (Pb), thereby providing a shielding space capable of shielding background radiation. Accordingly, the sensing member 32 provided inside the shielding unit 10 may obtain a sensing signal from which an external interference factor with respect to the vapor C introduced into the cavity 22 is removed.

In addition, the first and second shielding boxes 20 and 30 are mutually separable. More specifically, the first shielding box 20 is provided with a plurality of cavities 22 having different capacities and can be replaced, and the second shielding box 20 includes different types of sensing members 32, respectively. Multiple units are available and can be replaced. That is, the first and second shielding boxes 20 and 30 are variously replaceable by the operator according to the conditions of use. For example, the second shielding box 30 is provided with a plurality of detection members 32 of different types, such as a scintillation detector and a semiconductor detector, respectively, and may be replaced by an operator in response to the type of radiation to be detected.

As the first and second shield boxes 20 and 30 are separable, the first and second shield boxes 20 in consideration of the movement convenience of the separated first and second shield boxes 20 and 30 30 is provided with first and second handles 25 and 34, respectively. However, the present invention is not limited thereto, and various moving means such as a lift, including the first and second handles 25 and 34 may be provided in the first and second shield boxes 20 and 30 . there is.

In addition, a cover 35 is coupled to an end of the second shield box 30 that is not connected to the first shield box 20 among both ends. The cover 35 is provided with a metal material to minimize the leakage dose while providing a connection line for signal input/output to the sensing member 32 provided inside the second shielding box 30, the second shielding box (30) is coupled.

Here, the cover 35 is provided with a cover protrusion 36 inserted to a predetermined depth into the opening 33 of the second shielding box 30 to improve the shielding properties of the second shielding box 30 . The cover protrusion 36 is made of a shielding material including lead. That is, the cover protrusion 36 may be made of the same material as the first and second shielding members 21 and 31 of the first and second shielding boxes 20 and 30 , and may have shielding properties.

For reference, the sensing member 32 shown in FIG. 2 is exemplified as a scintillator detector capable of detecting gamma rays emitted at ¹⁶ N, which occupies the highest ratio among radionuclides emitted from the coolant. However, the type of the sensing member 32 is not limited thereto, and may vary according to the type of target radiation to be detected.

The partition wall 40 is provided as a detachable thin partition wall to seal between the cavity 22 and the sensing member 32 . In this embodiment, the first and second shielding boxes 20 and 30 are exemplified as being provided and coupled as a pair of second shielding boxes 30 corresponding to both ends of the first shielding box 20. To be coupled therebetween, the partition wall 40 is provided as a pair. Here, it is preferable that the partition wall portion 40 is detachably coupled to the first and second shield boxes 20 and 30 .

The barrier rib part 40 is made of a metal material having attenuation characteristics, such as aluminum (Al) or stainless steel, in consideration of attenuation characteristics of radiation. In this case, the partition wall portion 40 is provided with a relatively thin guide region 41 in the region facing the cavity 22 . That is, the partition wall portion 40 has a ring shape corresponding to the outer diameters of the first and second shielding boxes 20 and 30 , and a guide region having a relatively thin thickness in the central region of the ring-shaped partition wall portion 40 . (41) is provided. Here, since the guide region 41 is provided with a relatively thin thickness, the sensing member 31 provided inside the second shielding box 30 does not interfere with the detection of coolant leakage into the cavity 22 .

On the other hand, as openings 33 are provided at both ends of the second shield box 30, when the second shield box 30 is separated from the first shield box 20, the opening 33 is exposed and the second shield box Foreign substances such as outside air may be introduced into (30). Accordingly, the bulkhead portion 40 is coupled to one side of the second shielding box 30 facing the first shielding box 20 , thereby separating the second shielding box 30 from the first shielding box 20 . The opening 33 can be closed by the partition wall 40 .

In addition, the partition wall 40 can physically separate the cavity ²² and the second shielding box 30 inside the first shielding box 20 from leaking coolant containing radionuclides such as 16N. It is possible to block direct exposure of the sensing member 32 . Accordingly, it is possible to prevent physical and chemical damage to the sensing member 32 due to the coolant, which is advantageous in improving durability.

In this embodiment, the partition wall portion 40 is exemplified as being coupled to one side of the second shield box 30 facing the first shield box 20, but in the first and second shield boxes 20 and 30 Modifications in which all of them are installed are also possible. If both the partition walls 40 are installed in the first and second shielding boxes 20 and 30, the thickness of the guide region 41 is increased so as not to interfere with the coolant leakage detection signal of the sensing member 31. It is good to be thinly adjusted.

The support part 50 supports the shielding part 10 so that it does not flow from an external force. The support 50 includes a first support 51 that structurally supports the shield 10 and a second support 54 that functionally supports the shield 10 .

The first support 51 supports the outside of the shielding part 10 so that the shielding part 10 does not flow by an external force. To this end, the first support 51 is, as shown in FIGS. 2 and 3, first and second support members ( 52) (53). Here, the first support member 52 is provided with a first support surface 52a that closely adheres to and supports the lower outer peripheral surfaces of the first and second shield boxes 20 and 30, and the second support member 53 is A second support surface 53a for closely supporting and supporting the upper outer peripheral surface of the first and second shield boxes 20 and 30 is provided.

At this time, all of the first and second support surfaces 52a and 53a of the first and second support members 52 and 53 correspond to the outer peripheral surfaces of the first and second shield boxes 20 and 30 . has a curved shape. In addition, the first and second support members 52 and 53 are provided to have a predetermined thickness. As shown in FIG. 4 , the first and second support members 52 and 53 are in close contact with the outer peripheral surfaces of the first and second shielding boxes 20 and 30 in a state of being coupled to each other, so that an external force such as an earthquake By supporting the first and second shielding boxes 20 and 30 so that they do not flow, structural safety is provided.

As shown in FIGS. 2 and 3, the second support 54 supports the sensing member 32 provided inside the second shielding box 30, and when an external force such as an earthquake occurs, the sensing member 32 flows. Support so as not to cause deterioration of function.

The second support 54 has a hollow cylindrical shape so that the sensing member 32 is supported therein, and an assembly hole 55 opened at one side is provided through it. The assembly hole 55 is an opening for assembling the sensing member 32 into and out of the second support 54 . In addition, the second support 54 is provided with a sealing member 56 at the end coupled to the sensing member 32, it is possible to assemble between the second support 54 and the sensing member 32 airtightly.

As described above, since the second support 54 supports the sensing member 32 so that it does not flow, it is possible to protect the sensing member 32 even when an external force is generated to ensure functional safety.

For reference, as shown in FIG. 3 , the second support 54 may be installed on the cover 35 coupled to the end of the second shielding box 30 . That is, the second support 54 is installed on the cover protrusion 36 that is inserted into and coupled to the opening 33 of the second shield box 30 from the cover 35 , so that it is sensed inside the second shield box 30 . The member 32 is supported. Here, when the cover 35 and the second support 54 are provided integrally, the sensing member 32 by an external force such as an earthquake may be supported more effectively and safely.

The support part 60 is made of an insulating material that attenuates the noise of the sensing member 32 , and the shielding part 10 is placed thereon. To this end, the support unit 60 is provided with an insulator for supporting the bottom of the first and second shielding boxes 20 and 30, as shown in FIGS. 1 to 4, and the support 61, and a floor frame 62 for supporting the Here, the pedestal 61 is fixed by the first support member 52 of the first support 51 surrounding and supporting the lower outer circumferential surface of the first and second shielding boxes 20 and 30, whereby the first and second By attenuating the signal interference of the shielding boxes 20 and 30, it is possible to increase the reliability of the signal of the sensing member 32.

In addition, the support unit 60 includes side frames 63 for supporting both ends so that the shielding unit 10 does not flow in the lateral direction. The side frame 63 has a support hole 63a formed therethrough to support the cover 35 coupled to the end of the second shielding box 30 , and may be made of a metal material having shielding properties.

An operation for detecting coolant leak by the radiation detector shielding device 1 for detecting coolant leak in a nuclear reactor according to the present invention having the above configuration will be described with reference to FIGS. 1 to 4 .

As shown in FIG. 1 , steam C is introduced through the inlet pipe 23 into the first shielding box 20 of the shielding unit 10 provided in the same space as the unillustrated primary cooling system. Here, the steam C may include a coolant sucked near the primary cooling system (not shown) of the nuclear reactor, and is introduced into the cavity 22 provided inside the first shielding box 20 .

As for the vapor C introduced into the cavity 22 , the radiation of the coolant contained in the vapor C is sensed by the sensing member 32 provided in the adjacent second shielding box 30 . The detected radiation signal is transmitted to an external controller (not shown), so that it is possible to determine and deliver coolant leakage to the operator.

At this time, when an external force such as an earthquake is applied during the coolant leakage operation for the steam C introduced into the cavity 22, the first and second shielding boxes 20 and 30 are in close contact with the first support ( 51 ) and the second support 54 supporting the sensing member 32 inside the second shielding box 30 , structural and functional safety of the shielding unit 10 can be maintained. In addition, noise that may be generated during the sensing operation of the sensing member 32 may be attenuated by the pedestal 61 of the pedestal part 60, so that accurate signal detection is possible.

On the other hand, when conditions such as the capacity of the vapor C to be detected, the type of radiation, etc. are changed, the operator can replace the first and second shielding boxes 20 and 30 by separating them from each other. At this time, since the first and second shielding boxes 20 and 30 are sealed and protected by the partition wall 40 , it is possible to prevent the inflow of foreign substances even during separation.

Referring to FIG. 5 , a simulation result of before and after noise change due to radiation using the radiation detector shielding device 1 for detecting a coolant leak in a nuclear reactor according to an embodiment of the present invention is schematically shown. For reference, FIG. 5 is a graph showing results using the cylindrical shield 10 having a thickness of 5 cm and the sensing member 32 including a silicon semiconductor detector. In addition, in FIG. 5, the background radiation flux means background radiation formed in the annular corridor of the nuclear power plant in which the radiation detector is located by radiation generated during normal operation of the nuclear reactor.

As shown in the graph of FIG. 5 , when the radiation detector shielding device 1 for detecting a coolant leak in a nuclear reactor according to the present invention is applied, compared to the case in which the conventional shielding device 1 is not provided, approximately 92% of background radiation is reduced. You can check the noise shielding rate by Here, the graph of FIG. 5 is a signal caused by background beta rays by the sensing member 32 including a silicon semiconductor detector.

For reference, the graph of FIG. 5 exemplifies that the first and second shielding boxes 20 and 30 have a thickness of 5 cm, but is not limited thereto. That is, it is natural that the thickness of the first and second shielding boxes 20 and 30 can be variously changed to 6 cm, 7 cm, or more or less.

Referring to FIG. 6 , it is a graph comparing radiation signals sensed using the shielding unit 10 having a thickness of 5 cm. For reference, the graph of FIG. 6 also compares the beta signal of radiation according to the presence or absence of the radiation detector shielding device 1 for detecting leakage of the reactor coolant according to the present invention using the detection member 32 including a silicon semiconductor detector. .

As shown in FIG. 6 , it can be confirmed that the detection performance of the ¹⁶ N radiation signal in the coolant sensed by the present invention is excellent compared to the background radiation signal. That is, through the wide gap between the background radiation signal and the ¹⁶ N radiation signal in the coolant, the detection performance of the coolant leaked through the background radiation shielding can be confirmed.

Table 1 below summarizes the results of schematically simulating the change in the accumulated absorbed dose over 60 years due to the provision of the radiation detector shielding device 1 for detecting the leakage of the nuclear reactor coolant according to the present invention as described above.

accumulated over 60 years
absorbed dose division Absorbed dose before shielding (kGy) Absorbed dose after shielding (kGy) silicon semiconductor detector 17.3 2.2 preamplifier 9.5 1.1

Table 1 simulates and compares the cumulative absorbed dose over 60 years, the design life of a nuclear power plant, for a silicon semiconductor detector and a preamplifier with or without a radiation detector shielding device (1) for detecting a coolant leak in a nuclear reactor. As shown in Table 1, when the radiation detector shielding device 1 for detecting the leakage of the nuclear reactor coolant is provided, the effect of reducing the accumulated absorbed dose by approximately 88% can be confirmed. Since this increase in the accumulated absorbed dose is a cause of failure, if the radiation detector shielding device 1 for detecting the leakage of the reactor coolant according to the present invention is provided, it is advantageous to ensure the functional integrity of the detection member 32 against radiation embrittlement. Do.

As described above, although described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it can be done.

1: Radiation detector shield for reactor coolant leak detection
10: shield
20: first shield box
30: second shield box
40: bulkhead part
50: support
60: support

Claims (22)

A cavity in which the vapor containing the coolant leaked from the primary cooling system of the nuclear reactor is collected, and at least one sensing member for detecting radiation from the vapor collected in the cavity, providing a shielded space shield;
a partition wall part detachable to seal between the cavity and the sensing member;
a support part for supporting the shielding part not to flow from an external force; and
a support part provided with an insulating material for attenuating noise of the sensing member and on which the shielding part is placed;
includes,
A radiation detector shielding device for detecting leakage of a reactor coolant provided in the same space as the primary cooling system. According to claim 1,
The shielding part,
a first shielding box provided with a first shielding member made of a shielding material along an inner wall, the first shielding box having the cavity provided therein; and
a second shielding box having a second shielding member provided along an inner wall and having the sensing member provided therein to face the cavity;
includes,
The first and second shielding members are provided with a shielding material containing lead,
The first and second shielding boxes are a radiation detector shielding device for detecting a coolant leak in a nuclear reactor that is separated from each other. 3. The method of claim 2,
A plurality of the first shielding boxes are provided to have the cavities of different capacities and are replaceable,
A radiation detector shielding device for detecting leakage of a nuclear reactor coolant, wherein the second shielding box is provided in plurality to include different types of detection members, respectively, and at least one of the first shielding boxes is replaceable. 3. The method of claim 2,
The first and second shielding boxes have a hollow shape with both ends open,
The barrier rib portion is coupled to one end of at least one of the first and second shielding boxes, and a guide area having a relatively thin thickness is provided in an area facing the cavity. According to claim 1,
The shielding part is provided with a shielding material containing lead (Pb),
The barrier rib portion includes at least one barrier rib made of a metal material including aluminum and stainless steel capable of attenuating radiation, and a region facing the cavity is provided with a guide region having a relatively thin thickness. Radiation detector shield for use. According to claim 1,
The support part,
a first support for supporting the outside of the shielding part so that the shielding part does not flow by external force; and
a second support for supporting the sensing member inside the shielding unit so that the sensing member inside the shielding unit does not flow by external force;
A radiation detector shield for detecting a coolant leak in a reactor comprising a. 3. The method of claim 2,
The support part,
a first support member in close contact with the lower outer peripheral surfaces of the first and second shielding boxes; and a second support member in close contact with the upper outer peripheral surfaces of the first and second shielding boxes, wherein the first and second support members are mutually a first support fixed to the support part in a coupled state; and
a second support provided inside the second shield box with the sensing member coupled therein;
A radiation detector shield for detecting a coolant leak in a reactor comprising a. 8. The method of claim 7,
The second shielding box is closed by a cover having openings communicating with the cavity at both ends, the ends not facing the cavity are provided with cover protrusions inserted into the openings,
The second support is a radiation detector shielding device for detecting a coolant leak in a nuclear reactor provided integrally with the cover projection. 9. The method of claim 8,
The cover protrusion is a radiation detector shielding device for detecting a coolant leak in a nuclear reactor provided with a shielding material containing lead. 8. The method of claim 7,
In the second support, an assembly hole through which the sensing member can enter and exit is formed through one side,
A radiation detector shielding device for detecting leakage of a reactor coolant, wherein a sealing member is provided at a coupling portion between the second support and the sensing member. According to claim 1,
The radiation detector shielding device for detecting a coolant leak in a nuclear reactor includes a pedestal provided with an insulator for supporting the bottom of the shielding part. At least one first shielding box provided in the same space as the primary cooling system of the nuclear reactor to provide a shielding space, and having a cavity in which the vapor containing the coolant leaked from the primary cooling system is collected; a shielding unit adjacent to the first shielding box to face the cavity and including at least one second shielding box provided with a sensing member for detecting radiation from the vapor;
a partition wall part detachably attached to seal between the first and second shielding boxes;
a support part for supporting the shielding part so that it does not flow from an external force; and
a support part provided with an insulating material for attenuating noise of the sensing member, and on which the shielding part is placed;
A radiation detector shield for detecting a coolant leak in a reactor comprising a. 13. The method of claim 12,
The first and second shielding boxes are respectively provided so that a shielding member made of a lead-containing shielding material is provided along each inner wall, and a radiation detector for detecting a coolant leak in a nuclear reactor that can be separated from each other in a sealed state by the partition wall part shielding device. 13. The method of claim 12,
A plurality of the first shielding boxes are provided to have the cavities of different capacities and are replaceable,
A radiation detector shielding device for detecting leakage of a nuclear reactor coolant, wherein the second shielding box is provided in plurality to include different types of detection members, respectively, and at least one of the first shielding boxes is replaceable. 13. The method of claim 12,
The first and second shielding boxes have a hollow shape with both ends open,
The barrier rib portion is coupled to one end of at least one of the first and second shielding boxes, and a guide area having a relatively thin thickness is provided in an area facing the cavity. 13. The method of claim 12,
The first and second shielding boxes are provided with a shielding material containing lead (Pb),
The barrier rib portion includes at least one barrier rib made of a metal material including aluminum and stainless steel capable of attenuating radiation, and a region facing the cavity is provided with a guide region having a relatively thin thickness. Radiation detector shield for use. 13. The method of claim 12,
The support part,
a first support in close contact with the outer surfaces of the first and second shielding boxes; and
a second support for supporting the sensing member in the second shielding box;
A radiation detector shield for detecting a coolant leak in a reactor comprising a. 18. The method of claim 17,
The first support is,
a first support member in close contact with the lower outer peripheral surfaces of the first and second shielding boxes; and
a second support member in close contact with the upper outer peripheral surfaces of the first and second shielding boxes;
includes,
and the first and second support members are coupled to each other and are fixed to the support portion. 18. The method of claim 17,
The second shielding box is closed by a cover having openings communicating with the cavity at both ends, the ends not facing the cavity are provided with cover protrusions inserted into the openings,
The second support is a radiation detector shielding device for detecting a coolant leak in a nuclear reactor provided integrally with the cover projection. 20. The method of claim 19,
The cover protrusion is a radiation detector shielding device for detecting a coolant leak in a nuclear reactor provided with a shielding material containing lead. 19. The method of claim 18,
In the second support, an assembly hole through which the sensing member can enter and exit is formed through one side,
A radiation detector shielding device for detecting leakage of a reactor coolant, wherein a sealing member is provided at a coupling portion between the second support and the sensing member. 13. The method of claim 12,
The radiation detector shielding device for detecting a coolant leak in a nuclear reactor includes a pedestal provided with an insulator for supporting the bottom of the shielding part.

Images