Integrated insertion structures for control element drive mechanism and in-core instrument

Abstract

The present invention relates to integrated insertion structures for a control element drive mechanism and in-core instrument, in which the control element driving mechanism and in-core instrument are integrally configured so as to be mountable on the top portion of a nuclear reactor. The integrated insertion structures for a control element drive mechanism and in-core instrument, according to the present invention, comprises: a spider body; a plurality of spiders extending from the spider body; control rods respectively connected to the plurality of spiders; an in-core instrument guide tube part penetrating through the interior of the spider body; and an in-core instrument nozzle inserted into the in-core instrument guide tube part.

Description

Integrated insert structure for control rod drive device and in-well instrument

[0001] The present invention relates to an integrated insert structure for a control rod drive device and an in-reactor instrument, which is formed as an integrated structure and can be mounted on the upper part of a nuclear reactor.

[0002] The Control Element Drive Mechanism (CEDM) is used as a means to control the reactivity of nuclear fuel assemblies used in nuclear power plants.

[0003] The Control Rod Drive Mechanisms (CEDMs) commonly used in Korea are divided into the Westinghouse type and the CE type. In the Westinghouse type, one CEDM is inserted into the top of a single fuel assembly. In the CE type, one CEDM is inserted into the top of a single fuel assembly or five nearby fuel assemblies. In the case of a typical commercial nuclear power plant type that also uses boric acid as a means of controlling the reactivity of the nuclear fuel assembly, CEDMs are required for about one-third of the nuclear fuel assembly. However, in the case of a boric acid-free reactor type that does not use boric acid, CEDMs are required to be inserted into the majority of the nuclear fuel assemblies.

[0004] In nuclear power plants, in-core instruments (ICIs) are inserted into guide tubes within the fuel to monitor the condition of the fuel assembly. In domestic commercial nuclear power plants, ICIs are inserted through the bottom of the fuel assembly (bottom-mounted ICI). However, to minimize the penetration of the lower portion, a technology has been developed that allows ICIs to be inserted through the top of the fuel (top-mounted ICI).

[0005] However, the technology developed to date does not allow for the simultaneous insertion of the Control Rod Drive Mechanism (CEDM) and the In-Core Instrumentation (ICI) through the top of the nuclear fuel assembly. Therefore, when the boron-free and top-mounted ICI technologies are applied simultaneously, there is a problem in that it is difficult to simultaneously insert the Control Rod Drive Mechanism (CEDM) and the In-Core Instrumentation (ICI) through the top of the nuclear fuel assembly.

[0006] Accordingly, the present invention has been proposed to solve the above-mentioned problems, and the purpose of the present invention is to provide a reactor equipped with a top-mounted control rod drive device and a top-mounted in-core instrument, which can simultaneously insert the control rod drive device and the in-core instrument through the upper part of a nuclear fuel assembly when the technologies of boron-free and top-mounted in-core instrument (TM-ICI) are applied simultaneously.

[0007] In order to achieve the above-described object of the present invention, the present invention provides a control rod drive device and an integrated insert structure for an in-situ instrument, which includes a spider body, a plurality of spiders extending from the spider body, control rods respectively connected to the plurality of spiders, an in-situ instrument guide tube penetrating the spider body, and an in-situ instrument nozzle inserted into the in-situ instrument guide tube.

[0008] It is preferable that the above-mentioned indoor measuring instrument guide tube be placed in the central portion of the above-mentioned spider body.

[0009] The present invention provides a control rod drive device and an in-situ instrument integrated insert structure including a spider body, a plurality of spiders extending from the spider body, a control rod connected to the plurality of spiders, and an in-situ instrument nozzle connected to one of the plurality of spiders.

[0010] The present invention provides a control rod drive device and an in-situ instrument integrated insert structure including a spider body, a plurality of spiders extending from the spider body, a plurality of control rods connected to the spiders, a spider for an in-situ instrument extending from the spider body, and an in-situ instrument nozzle connected to the spider for the in-situ instrument.

[0011] It is preferable that the above control rod drive device and the above in-reactor instrument be formed as one unit and inserted into the upper part of the nuclear fuel assembly.

[0012] It is preferable that an in-situ measuring instrument guide tube is connected to one of the plurality of said spiders, and that the in-situ measuring instrument nozzle is inserted into the in-situ measuring instrument guide tube.

[0013] It is preferable that the in-furnace measuring instrument guide tube is connected to the spider for the in-furnace measuring instrument, and the in-furnace measuring instrument nozzle is inserted into the in-furnace measuring instrument guide tube.

[0014] The present invention can facilitate the design of a control rod drive device (CEDM) and an in-hearth instrument (ICI) when the technologies of a boron-free and top-mounted in-hearth instrument (TM-ICI) are applied simultaneously.

[0015] In addition, the present invention can be mounted on the upper part of a nuclear fuel assembly by integrating the control rod drive device and the in-core instrument, thereby eliminating the lower penetration part of a commercial nuclear power plant, thereby reducing the time and cost required for maintenance and manufacturing.

[0016] FIG. 1 is a schematic diagram showing the main parts of a control rod drive device and an internal measuring instrument integrated insert structure in plan view for explaining a first embodiment of the present invention.

[0017] Figure 2 is a schematic diagram showing a side view of Figure 1.

[0018] FIG. 3 is a schematic diagram showing the main parts of a control rod drive device and an internal measuring instrument integrated insert structure in plan view for explaining a second embodiment of the present invention.

[0019] Figure 4 is a schematic diagram showing a side portion of Figure 3.

[0020] FIG. 5 is a schematic diagram showing the main parts of a control rod drive device and an internal measuring instrument integrated insert structure in plan view for explaining a third embodiment of the present invention.

[0021] Figure 6 is a schematic diagram showing a side view of Figure 5.

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various other forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description have been omitted for clarity of description, and the same reference numerals will be assigned to identical or similar components throughout the specification.

[0023] FIG. 1 and FIG. 2 are drawings for explaining a first embodiment of the present invention, showing an integrated insert structure of a control rod drive device and an in-house measuring instrument.

[0024] The control rod drive device and the integrated insert structure of the first embodiment of the present invention include a spider body (111), a plurality of spiders (113), a control rod (115), an in-situ instrument guide tube (151), and an in-situ instrument nozzle (153).

[0025] The spider body (111) is located at the center of the control element drive mechanism (CEDM). A plurality of spiders (113) extend radially from the spider body (111) toward the outer periphery. A plurality of control rods (115) are coupled to the plurality of spiders (113). That is, each control rod (115) is coupled to a corresponding plurality of spiders (113).

[0026] The in-vehicle measuring instrument guide tube (151) is a space formed along the length direction in the central portion of the spider body (111). The in-vehicle measuring instrument nozzle (153) is inserted into the in-vehicle measuring instrument guide tube (151). The in-vehicle measuring instrument guide tube (151) may be a space formed in the spider body (111), or as another example, may be formed by inserting a separate guide tube-like component.

[0027] That is, the control rod drive device and the integrated insert structure of the first embodiment of the present invention is configured such that the internal instrument nozzle (153) is inserted and placed in the central portion of the control rod drive device.

[0028] The first embodiment of the present invention can manufacture a Westinghouse-type control rod drive unit and an in-core instrument as an integrated unit. The present invention can mount an insert structure, in which the control rod drive unit and the in-core instrument are integrated, on top of the control rod assembly (CEA). Therefore, the present invention can eliminate the lower penetration section of a commercial nuclear power plant, thereby reducing the time and cost required for maintenance and manufacturing.

[0029]

[0030] FIG. 3 and FIG. 4 are drawings for explaining a second embodiment of the present invention, showing an integrated insert structure of a control rod drive device and an in-house measuring instrument.

[0031] In the description of the second embodiment of the present invention, the same parts as in the first embodiment will be described by assigning the same reference numerals. In addition, in the description of the second embodiment of the present invention, the same description as in the first embodiment will be replaced with the description of the first embodiment described above, and only the differences will be described.

[0032] The control rod drive device and in-situ instrument integrated insert structure of the second embodiment of the present invention includes a spider body (111), a plurality of spiders (113), a control rod (115), and an in-situ instrument nozzle (153).

[0033] In a second embodiment of the present invention, the in-situ measuring instrument nozzle (153) is coupled to the spider (113a). That is, instead of connecting the control rod (115) to a spider (113a) selected from among a plurality of spiders (113), the in-situ measuring instrument nozzle (153) is connected.

[0034] That is, in the first embodiment of the present invention, the control rod drive device and the in-situ measuring device are manufactured as an integrated unit by installing the in-situ measuring device nozzle (153) in the central portion of the spider body (111), but in the second embodiment of the present invention, the in-situ measuring device nozzle (153) is connected to a spider (113a) selected from among a plurality of spiders (113).

[0035] Meanwhile, as another example of the second embodiment of the present invention, a separate component, a furnace measuring instrument guide tube (not shown), may be connected to a spider (113a) selected from among a plurality of spiders (113), and a furnace measuring instrument nozzle (153) may be installed on the furnace measuring instrument guide tube.

[0036] This second embodiment of the present invention, like the first embodiment, can be mounted on the upper portion of the control element assembly (CEA) by an insert structure that integrates a Westinghouse-type control rod drive device and an in-core instrument. This eliminates the need for a lower penetration section in a commercial nuclear power plant, thereby reducing the time and cost required for maintenance and manufacturing.

[0037]

[0038] FIG. 5 and FIG. 6 are drawings for explaining a third embodiment of the present invention, showing an integrated insert structure of a control rod drive device and an in-house measuring instrument.

[0039] The third embodiment of the present invention will be described by assigning the same reference numerals to the same parts as the first or second embodiment described above. Furthermore, in the description of the third embodiment of the present invention, any descriptions identical to those of the first or second embodiment will be replaced with their respective descriptions, and only the differences will be described.

[0040] The control rod drive device and the integrated insert structure of the third embodiment of the present invention includes a spider body (111), a plurality of spiders (113), a control rod (115), an in-furnace instrument nozzle (153), and a spider for the in-furnace instrument (155).

[0041] In a third embodiment of the present invention, a spider (155) for an in-furnace instrument extends from a spider body (111). The spider (155) for an in-furnace instrument extends radially toward the outer circumference. This spider (155) for an in-furnace instrument extends separately from the existing spider (113) from the spider body (111). In addition, an in-furnace instrument nozzle (153) is connected to this spider (155) for an in-furnace instrument.

[0042] In the second embodiment described above, the in-furnace instrument nozzle (153) is connected to the in-furnace instrument nozzle (153) using one of a plurality of spiders (113) that connect the existing control rod (115), but in the third embodiment of the present invention, the in-furnace instrument nozzle (153) is connected by extending a spider (155) for in-furnace instrumentation for installing the in-furnace instrument nozzle (153) separately from the spider body (111).

[0043] Meanwhile, as another example of the third embodiment of the present invention, an in-situ measuring instrument guide pipe (not shown) into which an in-situ measuring instrument nozzle (153) can be inserted into a spider (155) for an in-situ measuring instrument can be connected, and an in-situ measuring instrument nozzle (153) can be installed in this in-situ measuring instrument guide pipe.

[0044] The third embodiment of the present invention, like the first and second embodiments, can be mounted on the upper part of the control element assembly (CEA) by an insert structure in which a Westinghouse-type control rod drive device and an in-situ instrument are integrated.

[0045] This invention simultaneously applies the concepts of boron-free and top-mounted in-core instruments (TM-ICI), and can mount the in-core instrument (ICI) on top of the control element assembly (CEA) through an integrated spider structure that integrates the control element drive mechanism (CEDM) and the in-core instrument (ICI). Therefore, the present invention can eliminate the lower penetration section of a commercial nuclear power plant, thereby reducing the time and cost required for maintenance and manufacturing.

[0046] Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the claims, the detailed description of the invention, and the attached drawings, and it is obvious that this also falls within the scope of the present invention.

Claims

1. Spider body, A plurality of spiders extending from the above spider body, Control rods each connected to a plurality of said spiders, A guide tube for the internal measuring instrument penetrating the above spider body, and The internal measuring instrument nozzle inserted into the above internal measuring instrument guide tube An integrated insert structure including a control rod drive device and an in-house instrument.

2. In claim 1, The above-mentioned indoor measuring instrument guide pipe An integrated insert structure for a control rod drive device and an internal measuring instrument placed in the central portion of the above spider body.

3. Spider body, A plurality of spiders extending from the above spider body, Control rods connected to a plurality of said spiders, and A nozzle for measuring the internal diameter of a nozzle connected to one of the above spiders. An integrated insert structure including a control rod drive device and an in-house instrument.

4. Spider body, A plurality of spiders extending from the above spider body, Control rods connected to a plurality of said spiders, A spider for the inboard measuring instrument extending from the above spider body, and An in-situ measuring instrument nozzle connected to the spider for the above-mentioned in-situ measuring instrument An integrated insert structure including a control rod drive device and an in-house instrument.

5. In any one of claims 1, 3, and 4, The above control rod drive device and the above in-house instrument An integrated insert structure for the control rod drive device and the in-reactor instrument that is inserted into the upper part of the nuclear fuel assembly as an integral part.

6. In claim 3, A control rod drive device and an integrated insertion structure for a furnace instrument, wherein an in-furnace instrument guide tube is connected to one of the plurality of said spiders, and an in-furnace instrument nozzle is inserted into the in-furnace instrument guide tube.

7. In claim 4, A control rod drive device and an integrated insertion structure for the furnace instrument, in which a furnace instrument guide tube is connected to the above-mentioned furnace instrument spider and the furnace instrument nozzle is inserted into the above-mentioned furnace instrument guide tube.

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