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JP-2026075044-A - Nuclear reactor sample collection device

JP2026075044AJP 2026075044 AJP2026075044 AJP 2026075044AJP-2026075044-A

Abstract

[Problem] To provide a reactor sampling device that prevents the sample from mixing with contaminated water inside the reactor and enables the acquisition of samples from different depths of the reactor's inner wall. [Solution] A reactor sample collection device for collecting a sample from the inner wall of a nuclear reactor is provided, comprising: a main body having a containment space with an opening and the opening being in close contact with the inner wall; a sampling tool unit located in the containment space of the main body and equipped with a tool head for collecting a sample from the inner wall of the reactor through the opening; a lifting unit connected to the main body for raising and lowering the main body; and a sample discharge unit communicating with the containment space and for discharging the sample collected by the sampling tool unit to the outside of the main body. [Selection Diagram] Figure 1

Inventors

  • キム ハエ ウォーン
  • ナム ホ セオク
  • パク クワン ソー

Assignees

  • ドゥサン エナービリティー カンパニー リミテッド

Dates

Publication Date
20260507
Application Date
20250806
Priority Date
20241021

Claims (14)

  1. In a reactor sampling device that collects samples from the inner wall of a nuclear reactor, A storage space having an opening is provided, and the main body portion is positioned in close contact with the inner wall of the opening, A sampling tool unit is provided, which is located in the housing space of the main body and has a tool head for taking a sample of the inner wall of the reactor through an opening. A lifting mechanism connected to the main body, which raises and lowers the main body, A reactor sample collection apparatus comprising a sample discharge unit that communicates with the aforementioned containment space and discharges the sample collected by the sampling tool unit to the outside of the main body.
  2. The reactor sample collection apparatus according to claim 1, wherein the main body is provided with an air intake port and a sample discharge port communicating with the containment space.
  3. The reactor sample collection apparatus according to claim 2, wherein the main body includes an intake injection space that communicates with an air intake port and is equipped with a plurality of nozzle holes.
  4. The reactor sample collection apparatus according to claim 1, wherein the inner bottom of the main body includes a discharge guide with a downwardly sloping section.
  5. The reactor sample collection apparatus according to claim 4, wherein the discharge guide is positioned below the opening.
  6. The reactor sample collection apparatus according to claim 1, further comprising a fixing part connected to the main body and for maintaining the main body, which is in close contact with the inner wall of the reactor, in a fixed state.
  7. The aforementioned fixing part is A fixed body with adjustable length, The reactor sample collection apparatus according to claim 6, further comprising a fixed drive means connected to the fixed body and generating a driving force to adjust the length of the fixed body.
  8. The reactor sample collection apparatus according to claim 1, further comprising a sealing means for sealing the space between the main body and the inner wall of the reactor.
  9. The aforementioned sampling tool section is The tool body rotatably supports the tool head and is arranged to slide horizontally within the housing space of the main body, A sampling drive means connected to the tool head and generating a driving force to rotate the tool head, The reactor sample collection apparatus according to claim 1, further comprising a sampling moving means that generates a driving force to cause the tool body to slide within a housing space.
  10. The sample discharge unit is, An intake line communicating with the aforementioned containment space, An exhaust line communicating with the aforementioned containment space, An outside air supply means is positioned on the intake line and supplies outside air to the housing space of the main body, The reactor sample collection apparatus according to claim 1, further comprising a sample discharge means disposed on the exhaust line and generating back pressure so that the sample in the containment space of the main body is discharged through the exhaust line.
  11. The reactor sample collection apparatus according to any one of claims 1 to 10, further comprising a control unit for controlling the driving of the sample collection tool unit and the sample discharge unit.
  12. The reactor sample collection apparatus according to claim 11, wherein the control unit controls the depth to which the sampling tool is inserted into the inner wall of the reactor according to the material of the inner wall of the reactor.
  13. The control unit, When taking a sample from the inner wall of the reactor, the drive of the sampling tool is controlled so that the insertion depth of the tool head of the sampling tool into the inner wall of the reactor is adjustable. The reactor sample collection apparatus according to claim 12, wherein after the collection of a sample from the inner wall of the reactor via the tool head is completed, the drive of the sample discharge unit is controlled so that the sample is discharged to the outside of the main body.
  14. When the control unit takes samples from different target depths of the inner wall of the reactor, The reactor sample collection apparatus according to claim 13, which performs a cleaning operation to discharge residual samples from the containment space of the main body to the outside.

Description

This invention relates to a reactor sampling apparatus for collecting samples from the inner wall of a nuclear reactor at different depths during the decommissioning of a nuclear power plant. Generally, during the decommissioning of a nuclear power plant, sampling is required for characterizing the site, activation equipment, and structures. This involves collecting samples from the metal surfaces of activation structures such as reactors and primary system equipment for radionuclide and chemical analysis. One method for collecting internal samples involves using smear paper to collect the sample and then measuring it with a detector. However, this method involves a person directly rubbing the contaminated area with the smear paper to collect the contaminated sample, which carries a high risk of radiation exposure. As a result, recently, sampling devices that recover samples cut in a one-piece form by electrical discharge machining (EDM) are being used. However, in the case of sampling devices that cut and collect samples using electrical discharge machining, there are problems with accurate sample measurement when collecting samples in the water inside the reactor, as the sample mixes with contaminated water, and there are limitations to collecting samples at different depths of the reactor's inner wall. The relevant technology for a sample collection device for such activated structures is presented in Korean Patent Registration No. 10-1646598 (August 2, 2016). This is a diagram showing the configuration of a reactor sample collection device according to one embodiment of the present invention.This is a diagram showing the usage state of a reactor sample collection device according to one embodiment of the present invention.This is an enlarged view of the "A" section shown in Figure 2.This is a partial cross-sectional view of a reactor sample collection device according to another embodiment of the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather in a manner consistent with the technical idea of the present invention, in accordance with the principle that inventors may appropriately define the concepts of terms in order to best describe their invention. Referring to Figures 1 to 4, the reactor sample collection apparatus according to one embodiment of the present invention may include a main body 100, a sample collection tool 200, a lifting/lowering unit 300, and a sample discharge unit 400. The main body 100 can be positioned in close contact with the inner wall of the reactor 10. The main body 100 may be provided with a storage space 100a to store the sample collected by the operation of the sampling tool 200, while the sampling tool 200 is housed within it. The main body 100 may have a hexahedral shape, or an opening 100b communicating with the containment space 100a may be provided in the portion facing the inner wall of the reactor 10. Such an opening 100b allows the tool head 211 of the sampling tool 200 to protrude from the containment space 100a to the outside of the main body 100, thereby enabling the sampling of a sample from the inner wall of the reactor 10 via the tool head 211, and allowing the collected sample to be contained in the containment space 100a. Furthermore, the main body 100 may be provided with an air intake port 110 and a sample discharge port 120 that communicate with the containment space 100a. For example, the air intake port 110 may be located on the upper surface of the main body 100, and the sample discharge port 120 may be located on the lower surface of the main body 100. Referring to Figure 4, the upper surface of the main body 100 may be provided with an intake air injection space 110a that communicates with the intake port 110. Furthermore, multiple nozzle holes 110b communicating with the intake injection space 110a are provided, allowing outside air flowing into the intake injection space 110a via the intake port 110 to be evenly injected into the containment space 100a of the main body 100 through the nozzle holes 110b. Such nozzle holes 110b allow outside air flowing into the containment space 100a to be injected throughout the entire containment space 100a, thereby ensuring that the sample contained in the containment space 100a does not remain adhering to the inner surface of the main body 100, but is cleanly discharged through the sample discharge port 120. Furthermore, the inner bottom of the main body 100 may be provided with a downwardly sloping portion 130. As an example, the inclined portion 130 is positioned below the opening 100b and guides the sample collected via the tool head 211 of the sampling tool 200 to move towards the sample discharge port 120 when it is free-falling due to g