CN112130194A - A neutron detector rapid inspection device - Google Patents

Abstract

The invention belongs to the technical field of spent fuel post-processing, and particularly relates to a fast testing device for a neutron detector, which is used for measuring the neutron detector (10) in a series detection device, wherein the series detection device is formed by connecting a plurality of neutron detectors (10) in series, and is characterized in that: the neutron source detection device comprises a shielding container (4) with an internal neutron source (9), wherein a through hole (6) capable of passing through the series detection device is further formed in the shielding container (4). The neutron detector rapid inspection device provided by the invention is small in size, light in weight and convenient to carry, can realize rapid inspection of each neutron detector (10) in the series detection device without disassembling the series detection device, and is simple and convenient in inspection operation.

Description

A neutron detector rapid inspection device

technical field

The invention belongs to the technical field of spent fuel reprocessing, and in particular relates to a rapid inspection device for a neutron detector.

Background technique

Spent fuel, also known as irradiated nuclear fuel, is nuclear fuel that has been exposed to radiation and used, usually produced by the nuclear reactor of a nuclear power plant. The 3%-4% uranium waste (spent fuel) that has been used is chemically separated from uranium and plutonium from fission products, which is called spent fuel redissolving and reprocessing technology. Recovered uranium and plutonium can be recycled in mixed oxide fuel in nuclear power plants to produce more energy, thereby making uranium resources more efficient and reducing enrichment needs. Reprocessing also aids in the final disposal of waste by reducing the volume of high-level radioactive waste and removing plutonium.

Well-known solvent extraction equipment commonly used in reprocessing plants are mixer-settler tanks and pulsed extraction columns. The concentration of the plutonium solution in the pulse extraction column is one of the key objects of concern, which directly reflects the operating process state of the reprocessing plant. As shown in Figure 1, the current monitoring method for the concentration of plutonium solution in the pulse extraction column is mainly to place a series detection device near the pulse extraction column in the equipment room for measurement. The series detection device is composed of several neutron detectors connected in series and placed in Within a casing, the in-line detection device can be accessed and exited from the casing. The neutron detector in the series detection device needs to be inspected regularly, and how to inspect the series detection device conveniently and quickly is one of the key points of the research.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a detection device that can quickly test each neutron detector in the series detection device, so that the measurement results of the neutron neutron detector are more accurate.

In order to achieve the above purpose, the technical solution adopted in the present invention is a rapid inspection device for neutron detectors, which is used to measure the neutron detectors in the series detection device. It is composed of a series of detectors, which includes a shielding container with a neutron source inside, and the shielding container is also provided with a perforation that can pass through the series detection device.

Further, a neutron source placement hole is provided inside the shielding container, and the neutron source is disposed in the neutron source placement hole.

Further, the perforation penetrates the shielding container.

Further, the neutron source is close to the through hole.

Further, the neutron source placement hole is blocked by a sealing plug.

Further, the material of the shielding container is polyethylene, which can moderate the neutrons emitted by the neutron source.

Further, the material of the sealing plug is polyethylene.

Further, the shielding container is a cylinder, the neutron source placement hole is located at the axial position of the shielding container, and the perforation passes through the vicinity of the sealed bottom end of the neutron source placement hole.

Further, a handle is also provided on the shielding container.

The beneficial effects of the present invention are:

1. The size of the shielding container 4 is about Φ250mm×250mm, and the weight is about 12kg, which is easy to carry.

2. The rapid inspection of each neutron detector 10 in the series detection device is realized without disassembling the series detection device.

3. The inspection operation is simple and convenient.

Description of drawings

Fig. 1 is the schematic diagram of the casing 2 arranged on the pulse extraction column 1 in the equipment room described in the background technology part of the present invention, and a series detection device composed of several neutron detectors 10 connected in series is arranged in the casing 2;

2 is a schematic perspective view of a rapid inspection device for a neutron detector described in the specific embodiments of the present invention;

3 is a schematic plan view of a device for rapid inspection of a neutron detector according to the specific embodiment of the present invention;

Fig. 4 is the A-direction view of Fig. 3;

Fig. 5 is the B-direction view of Fig. 3;

6 is a schematic diagram of a detection process of a series detection device in a neutron detector rapid inspection device described in the specific embodiments of the present invention;

In the picture: 1-pulse extraction column, 2-sleeve, 3-wall, 4-shielding container, 5-sealing plug, 6-perforation, 7-handle, 8-neutron source placement hole, 9-neutron source, 10-neutron detector.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 2 to FIG. 5 , the present invention provides a rapid inspection device for neutron detectors, which is used to measure the neutron detectors 10 in the series detection device. The series detection device consists of several neutron detectors 10 A neutron detector rapid inspection device provided by the present invention is a shielding container 4 with a neutron source 9 inside, the shielding container 4 can shield the radioactive particles emitted by the neutron source 9, and the shielding container 4 is also provided with There are perforations 6 that can pass through the in-line detection means.

A neutron source placement hole 8 is provided inside the shielding container 4 , and a neutron source 9 is arranged in the neutron source placement hole 8 .

The perforation 6 penetrates the shielding container 4 .

The neutron source 9 is close to the perforation 6 .

The neutron source placement hole 8 is closed by the sealing plug 5 .

The material of the shielding container 4 is polyethylene, which can moderate the neutrons emitted by the neutron source 9 .

The sealing plug 5 is rod-shaped and made of polyethylene.

The shielding container 4 is a cylinder, the neutron source placing hole 8 is located at the axial position of the shielding container 4 , and the through hole 6 passes through near the sealed bottom end of the neutron source placing hole 8 .

The shielding container 4 is also provided with a handle 7, which is convenient for the operator to carry the device to a designated position for operation.

An example is given to illustrate the practical application of the device for rapid inspection of a neutron detector provided by the present invention;

As shown in Fig. 1, the height of the pulse extraction column 1 is about 12.3 meters, the height of the plate section is about 8 meters, and a neutron detector 10 is designed to be placed every 1 meter in the plate section, so a total of 9 neutron detections are required The neutron detector 10 and the neutron detector 10 form a series detection device and are put into the casing 2, and the series detector can enter and exit the casing 2 by manpower.

The process of inspecting the series detection device is shown in FIG. 6 , a neutron source 9 is set in the neutron source placement hole 8 of the shielding container 4, and the neutron detectors 10 on the series detection device are inspected through the hole 6 in turn. After the inspection of the neutron detectors 10 is completed, the series detection device is moved to test the next neutron detector 10 until all the neutron detectors 10 are inspected.

All the connection harnesses of the neutron detectors 10 are led out from one side of the series detection device. During inspection, the connection harness needs to be connected to the corresponding electronic device for testing. If the neutron detector 10 fails, it can be replaced in time. After the inspection is completed, the neutron source 9 is taken out, and the series detection device is placed in the casing 2 continue to work.

The device described in the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can obtain other embodiments according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.

Claims (9)

1. A neutron detector rapid inspection device for measuring a neutron detector (10) in a series detection device, wherein the series detection device is composed of several neutron detectors (10) connected in series, It is characterized in that it comprises a shielding container (4) with a neutron source (9) inside, and the shielding container (4) is further provided with a perforation (6) that can pass through the series detection device. 2. The device for rapid inspection of a neutron detector according to claim 1, wherein the shielding container (4) is provided with a neutron source placement hole (8) inside, and the neutron source (9) is arranged in the The neutron source is placed in the hole (8). 3. The device for rapid inspection of a neutron detector according to claim 2, wherein the through hole (6) penetrates the shielding container (4). 4. The rapid inspection device for a neutron detector according to claim 3, wherein the neutron source (9) is close to the through hole (6). 5 . The rapid inspection device for a neutron detector according to claim 4 , wherein the neutron source placement hole ( 8 ) is blocked by a sealing plug ( 5 ). 6 . 6 . The rapid inspection device for a neutron detector according to claim 1 , wherein the shielding container ( 4 ) is made of polyethylene, which can moderate the neutrons emitted by the neutron source ( 9 ). 7 . 7. The device for rapid inspection of a neutron detector according to claim 5, wherein the material of the sealing plug (5) is polyethylene. 8. The device for rapid inspection of neutron detectors according to claim 4, wherein the shielding container (4) is a cylinder, and the neutron source placement hole (8) is located on the axis of the shielding container (4). position, the perforation (6) passes through near the sealed bottom end of the neutron source placement hole (8). 9 . The device for rapid inspection of neutron detectors according to claim 1 , wherein a handle ( 7 ) is further provided on the shielding container ( 4 ). 10 .

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