KR-102963813-B1 - DISPOSAL CONTAINER RECOVERY DEVICE FOR DEEP BOREHOLE DISPOSAL

Abstract

The present invention is a disposal container recovery device for deep borehole disposal that lifts and recovers a disposal container containing high-level waste, which is fixed in a borehole with a connector fixed therein, to the outside of the borehole, and comprises: a guide connected to a lifting device on the ground; a lifting rod mounted on the lower part of the guide; a weight slidable relative to the lifting rod while passing through the lifting rod; a control rod formed to surround the lifting rod; a casing supported by the control rod; and a plurality of locking members that are pin-connected to the casing and formed to be rotatable around the pin, surround the lifting rod and the control rod, and are inserted into the connector and are opened by the lifting rod to maintain a connection to the connector.

Inventors

• 김문오
• 정덕운
• 조동건
• 이창수
• 박경우
• 최승범
• 이종호
• 명제삼

Assignees

• (주) 코네스코퍼레이션

Dates

Publication Date

20260512

Application Date

20231226

Claims (7)

1. A disposal container recovery device for deep borehole disposal that lifts and recovers a disposal container containing high-level waste, which is stationary inside a borehole with a connector fixed at the top, to the outside of the borehole. A guide connected to ground lifting equipment and moving up and down inside the borehole; A lifting rod mounted on the lower part of the above guide; A weight located at the lower part of the above guide and capable of sliding relative to the lifting rod while passing the lifting rod; A control rod connected to the above weight and formed to wrap around the lifting rod; It includes a casing supported by the control rod, and a locking unit having a plurality of locking members that are pin-connected to the casing and formed to be rotatable around the pin, and which surround the lifting rod and the control rod and are opened by the lifting rod while inserted into the connector to maintain a connection to the connector. Inside the above weight, a space having a certain height in the vertical direction is formed, and The above lifting rod is; A vertical extension bar, the upper end of which is fixed to the guide and extends vertically downward, and which can enter the interior of the connector when descending, and A weight support plate formed on the above-mentioned vertical extension bar, accommodated within the above-mentioned space of the weight, and resting on the ceiling surface of the above-mentioned space when the guide is lifted, and A pressure disc formed at the lower end of the vertical extension bar and radially pressurizing the locking member while in a state of entering between the opened locking members to maintain the coupling of the locking member to the connector, and A control rod support formed on the upper side of the above-mentioned pressure disk and having a control rod support that supports the lower end of the control rod, Retrieval device for disposal containers for deep borehole disposal.
2. delete
3. In paragraph 1, The above control rod is; A hollow rod formed to wrap around the vertical extension bar, and A hook spreader provided at the lower end of the above-mentioned hollow rod and spreading the locking members gathered towards the center to secure a space through which the pressure disc can enter between the locking members, and A hanger plate located at the upper end of the hollow rod and accommodated within the space of the weight, and The above hollow rod is provided with a load receiver formed at a lower position of the weight and transmitting the load of the weight to the hollow rod when the weight descends. On the upper part of the above hook spreader, a casing support portion is formed to support the casing. Retrieval device for disposal containers for deep borehole disposal.
4. In paragraph 3, The above casing is, It has a through hole in the center through which the above-mentioned hollow rod passes, and takes the shape of a cylinder open at the bottom, The above locking member is, The upper part is pin-connected to the lower side of the casing, and the inward surface has an inward support projection that supports the hook spreader. Retrieval device for disposal containers for deep borehole disposal.
5. In paragraph 4, A locking portion is provided on the inner surface of the above connector, and On the outer surface of the lower part of the above-mentioned locking member, a hook portion is formed that engages with the lower part of the above-mentioned catch portion and lifts the connector when the above-mentioned locking unit is raised. Retrieval device for disposal containers for deep borehole disposal.
6. In paragraph 1, The above guide is; A body having multiple mounting grooves formed in the main body, and A plurality of wings fitted into each mounting groove and protruding from the outer surface of the body, Retrieval device for disposal containers for deep borehole disposal.
7. In paragraph 6, In the above guide, An elastic support member that elastically supports the wing in the radial direction of the body, and Further equipped with a detachment prevention means for preventing the wing from detaching from the body, Retrieval device for disposal containers for deep borehole disposal.

Description

DISSPOSAL CONTAINER RECOVERY DEVICE FOR DEEP BOREHOLE DISPOSAL The present invention relates to a recovery device for lifting and recovering a disposal container placed inside a deep borehole to the outside of the borehole, and more specifically, to a disposal container recovery device for deep borehole disposal that operates solely by mechanical operation by its own weight without using electrical control or power, thereby preventing failure in the harsh deep environment, ensuring good operating efficiency, and eliminating the risk of separation during lifting. High-level radioactive waste refers to waste with high radiation intensity, generated from spent nuclear fuel or the reprocessing of nuclear fuel. Due to the high intensity of radiation emissions, the transportation and disposal of such high-level waste present significant challenges compared to low-level waste. For example, because spent nuclear fuel contains residual fissile material and continues to emit large amounts of radiation and high temperatures, it is difficult to transport or dispose of immediately; consequently, it is temporarily cooled and stored in underwater storage pools for decades. Excluding reprocessing for recycling, the final disposal methods for spent nuclear fuel include deep disposal, in which sealed containers containing spent fuel are disposed of at depths of several hundred meters underground, and Deep Borehole Disposal (DBD), in which fuel is permanently disposed of in very deep bedrock layers several kilometers underground. Among these, the deep borehole disposal method is a disposal method that does not require a large site area and can be expected to provide long-term structural safety by utilizing the ground of deep crystalline bedrock. However, since the deep borehole disposal method is a process carried out in a deep, confined space, there are difficulties in controlling the settling and retrieval of disposal containers, and research to improve this is ongoing. In this regard, research is also being conducted on the connection and disconnection methods of disposal containers for equipment used for deep borehole disposal, and the jetted J-slot method is known as one such method. The jetted J-slot method releases the connection by pressing and breaking the fixing pin connecting the disposal container and the J-slot using a downward force. In addition to the above joining/unlocking method, a fastening method using a wedge coupling structure is proposed in Patent Document 1 as a fastening method for a disposal container for a deep borehole disposal equipment. The fastening device for a disposal container for a deep disposal borehole disclosed in Patent Document 1 comprises: a first wedge part in which the lower side is coupled to a high-level waste disposal container and a first wedge is formed protrudingly on the upper side; a descender in which a piston movement space is formed on the lower side and a control rod is formed protruding into the piston movement space; and a fastening part in which a piston part is formed on the upper side facing the descender, and a second wedge part is formed by hinge coupling to the lower side to form a piston movement space, and a second wedge part is formed to be coupled to the first wedge. The device is characterized by releasing the fastened second wedge part and the first wedge part through the control rod. FIG. 1 is a drawing illustrating a disposal container recovery device for deep borehole disposal according to one embodiment of the present invention, together with a connector and a disposal container. Figure 2 is a front view showing the recovery device of Figure 1 coupled to the connector. Fig. 3 is an exploded perspective view of the recovery device illustrated in Fig. 1. Figure 4 is a cross-sectional view illustrating the internal configuration of the recovery device of Figure 1. FIG. 5 is a cross-sectional view showing the lifting rod and control rod of FIG. 4 separately. Fig. 6 is an exploded perspective view of the locking unit illustrated in Fig. 3. FIGS. 7 and FIGS. 8 are drawings illustrating a guide of a different configuration applicable to a recovery device according to one embodiment of the present invention. FIGS. 9 and FIGS. 10 are drawings for explaining the sequential operation of a disposal container recovery device according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In order to explain the present invention simply and clearly in the drawings, parts unrelated to the explanation have been omitted, and the same reference numerals have been used for identical or similar components throughout the specification. Furthermore, embodiments of the present invention are described with a focus on the main components, an