KR20110127896A - Single sleeve of nuclear fuel assembly for fixing bottom grid - Google Patents

Single sleeve of nuclear fuel assembly for fixing bottom grid Download PDF

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KR20110127896A
KR20110127896A KR1020100047396A KR20100047396A KR20110127896A KR 20110127896 A KR20110127896 A KR 20110127896A KR 1020100047396 A KR1020100047396 A KR 1020100047396A KR 20100047396 A KR20100047396 A KR 20100047396A KR 20110127896 A KR20110127896 A KR 20110127896A
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South Korea
Prior art keywords
lower support
single sleeve
support grid
guide tube
sleeve
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KR1020100047396A
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Korean (ko)
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KR101125798B1 (en
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김일규
김용환
윤광호
전경락
이진석
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한전원자력연료 주식회사
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/34—Spacer grids
    • G21C3/3424—Fabrication of spacer grids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

PURPOSE: A single sleeve of a nuclear fuel assembly for fixing a bottom grid is provided to reduce the number of processes for coupling a guide pipe with the bottom grid and reduce the number of processes for welding a sleeve to the guide pipe. CONSTITUTION: A single sleeve(100) comprises a cylindrical hollow body(110) and an elastic coupling unit(120). The body has the length longer than the height of a bottom grid(1). The top and the bottom of the single sleeve are protruded toward the top and the bottom of the bottom grid. A cutting unit(121) is radially formed on the outer circumference of the elastic coupling unit. Upper and lower support protrusions(130,140) for fixing the bottom grid are formed on the top of the elastic coupling unit and the outer circumference of the bottom of the body respectively. A slope(131) is formed on the upper support protrusion to guide easy insertion of the single sleeve.

Description

핵연료집합체의 하부지지격자 고정용 단일 슬리브{SINGLE SLEEVE OF NUCLEAR FUEL ASSEMBLY FOR FIXING BOTTOM GRID}SINGLE SLEEVE OF NUCLEAR FUEL ASSEMBLY FOR FIXING BOTTOM GRID}

본 발명은 하부지지격자에 조립되는 슬리브를 단일 슬리브로 구성한 핵연료집합체의 하부지지격자 고정용 단일 슬리브에 관한 것이다.
The present invention relates to a single sleeve for fixing a lower support grid of a nuclear fuel assembly, wherein the sleeve assembled to the lower support grid comprises a single sleeve.

핵연료 집합체란 핵연료를 원자로에 장전 및 인출시 개개가 아닌 일체로서 취급할 수 있는 연료요소의 집합체를 말한다. 예를 들면, 경수로용의 핵연료집합체는 우라늄 산화물을 펠릿모양으로 소결하여 약 4m 길이의 지르칼로이 합금의 속이 빈 관 내에 봉입한 연료 230개 정도를 4각 격자 모양의 다발로 하여, 상하에 냉각재가 지나는 구멍이 뚫린 지지판을, 중간에는 연료봉의 간격을 유지하기 위한 지지격자들을 장착한 구조로 되어 있다.A fuel assembly is a collection of fuel elements that can be treated as a unit, rather than as an individual, when the fuel is loaded and withdrawn from the reactor. For example, a nuclear fuel assembly for light water reactors uses sintered pellets of uranium oxide in the form of a quadrangular lattice bundle of about 230 fuels enclosed in a hollow tube of about 4 m in length. It has a structure in which a support plate with a perforated hole is provided, and support grids for maintaining a gap between fuel rods in the middle.

이러한 집합체에서 연료봉이 장입되는 골격이 되는 구조를 골격체라고 하고, 골격체는 도 1에 도시된 바와 같이 상단고정체(3), 하단고정체(4), 안내관(2), 계측관(5), 하부지지격자(1)를 포함하는 지지격자들 등의 부품으로 구성되며, 이 부품들은 용접이나 기계적인 방법에 의해 결합된다. 골격체는 핵연료 집합체에서 각 연료봉들 간의 간격을 유지하고 연료봉(도시 생략)을 고정시켜 주는 역할을 하는 조립체로서 핵연료 집합체의 기계적 구조의 근간을 이루고 있다.The structure that becomes the skeleton in which the fuel rods are charged in such an assembly is called a skeleton, and the skeleton is the upper fixture 3, the lower fixture 4, the guide tube 2, the measuring tube (as shown in FIG. 1). 5), consisting of parts such as support lattice including the lower support lattice 1, which are joined by welding or mechanical methods. Skeletal body is an assembly that serves to maintain the gap between each fuel rod in the fuel assembly and to fix the fuel rod (not shown), which forms the basis of the mechanical structure of the fuel assembly.

핵연료집합체의 조립시 연료봉을 골격체에 장입한 다음 상ㆍ하단 고정체(3)(4)를 부착하여 고정함으로써 핵연료집합체의 조립이 끝나고 완성된 집합체의 연료봉 간의 간격, 뒤틀림, 전장, 치수 등을 검사하는 것으로 집합체 제조공정이 마무리된다.When assembling the fuel assembly, insert the fuel rod into the skeleton, and then attach and fix the upper and lower fixtures (3) and (4) to finish the assembly of the fuel assembly. Inspection completes the assembly manufacturing process.

여기서, 하부지지격자(1)를 포함하는 지지격자들은 다수의 연료봉이 각각 장입될 수 있는 공간부를 구획하도록 스트립(얇은 금속판)이 각각 일정간격으로 형성된 슬롯을 상호 결합하여 격자 상으로 형성된다. 하부지지격자(1)를 포함하는 지지격자들은 상하 10개 내지 13개 정도로 배열되며 약 4m 길이의 안내관(2)과 용접 또는 기계적으로 체결된다. 하부지지격자(1)를 포함하는 지지격자들에는 스프링 및 딤플이 규칙적으로 형성되어 있으며 상기 스프링 및 딤플이 연료봉과 접촉함으로써 연료봉들 간의 간격을 유지하고 정해진 위치에 배열되도록 하며 스프링(미도시)의 탄성에 의하여 연료봉이 고정되도록 한다.Here, the support grids including the lower support grids 1 are formed in a lattice shape by mutually coupling slots each formed at a predetermined interval so that a strip (thin metal plate) is partitioned so as to partition a space portion in which a plurality of fuel rods can be charged. The support grids including the lower support grids 1 are arranged about 10 to 13 up and down and are welded or mechanically fastened to the guide tube 2 having a length of about 4 m. Springs and dimples are regularly formed in the support grids including the lower support grid 1 so that the springs and dimples come into contact with the fuel rods to maintain the spacing between the fuel rods and to be arranged at a predetermined position. The fuel rod is fixed by elasticity.

이때 안내관(2) 및 계측관(5)은 긴 튜브의 형태로 형성되어 있으며 하부지지격자(1)를 포함하는 지지격자들에 삽입 결합되어 골격체를 형성하게 된다. 하부지지격자(1)를 포함하는 지지격자들에 삽입된 안내관(2) 및 계측관(5)은 하부지지격자(1)를 포함하는 지지격자들과 체결되어 지지격자의 움직임을 구속하게 된다.At this time, the guide tube (2) and the measurement tube (5) is formed in the form of a long tube is inserted into the support grid including the lower support grid (1) to form a skeleton. The guide tube 2 and the measurement tube 5 inserted into the support grids including the lower support grid 1 are engaged with the support grids including the lower support grid 1 to restrain the movement of the support grid. .

이러한 안내관(2)과 지지격자의 체결 방법 중 안내관(2)과 하부지지격자(1)의 체결 방법에는 도 2에 도시된 바와 같이, 하부지지격자(1)를 안내관에 고정하기 위하여 하부지지격자(1)의 상ㆍ하측에 2개의 슬롯형 슬리브(10)를 삽입시킨 후 삽입된 상ㆍ하측의 슬리브(10)를 안내관(2)에 용접하여 하부지지격자(1)의 위치를 고정한다.In the fastening method of the guide tube 2 and the lower support grid 1 of the fastening method of the guide tube 2 and the support grid, as shown in FIG. 2, to fix the lower support grid 1 to the guide tube. Position the lower support grid 1 by inserting two slotted sleeves 10 into the upper and lower sides of the lower support grid 1 and welding the inserted upper and lower sleeves 10 to the guide tube 2. Fix it.

그런데, 이러한 체결방법은 하부지지격자 1개당 8개의 슬리브를 조립하여 안내관에 용접해야되며, 스테인리스 재질로 이루어진 하부지지격자 슬리브와 지르코늄 알로이로 제조된 안내관의 열팽창 차이를 반영하기 위해 조립시 소정의 간격 조정이 필요하므로 공정수 및 공정시간이 증가하는 문제가 있다.
However, this fastening method is to assemble eight sleeves per one lower support grid and weld to the guide tube, and when assembling to reflect the difference in thermal expansion of the lower support grid sleeve made of stainless steel and the guide tube made of zirconium alloy Since the interval of the need to be adjusted, there is a problem that the number of processes and the process time increases.

본 발명은 이러한 문제점을 해소하기 위한 것으로, 본 발명의 과제는 하부지지격자에 조립되는 슬리브를 단일 슬리브로 구성함으로써 4개의 슬리브와 하부지지격자를 조립하여 안내관에 용접할 수 있도록 한 하부지지격자 고정용 단일 슬리브를 제공하는 것이다.
The present invention is to solve this problem, the object of the present invention is to assemble the four sleeves and the lower support grid by assembling the sleeve to be assembled to the lower support grid to the lower support grid to weld to the guide tube It is to provide a single sleeve for fixing.

상술한 과제를 해결하기 위하여, 본 발명에서는 안내관이 삽입되도록 원통형의 중공체로 이루어지며, 양단이 각각 하부지지격자의 상ㆍ하측으로 돌출 결합되는 몸체; 상기 몸체의 일측에 형성되어 안내관에 용접 결합되는 탄성 결합부; 상기 탄성 결합부에 형성되는 다수의 절개부를 포함하는 핵연료집합체의 하부지지격자 고정용 단일 슬리브가 제공된다.In order to solve the above problems, the present invention is made of a cylindrical hollow body so that the guide tube is inserted, both ends protruding coupled to the upper and lower sides of the lower support grid; An elastic coupling part formed at one side of the body and welded to the guide tube; A single sleeve for fixing a lower support grid of a nuclear fuel assembly including a plurality of cutouts formed in the elastic coupling portion is provided.

상기 몸체의 상부와 하부에는 각각 몸체의 직경보다 큰 직경을 갖는 상하부 받침턱이 형성될 수 있다.Upper and lower pedestals each having a diameter larger than the diameter of the body may be formed on the upper and lower portions of the body.

상기 상부 받침턱에는 단일 슬리브가 삽입을 안내하기 위한 경사면이 형성될 수 있다.The upper support jaw may be formed with an inclined surface for guiding insertion of a single sleeve.

이와 같이 구성된 본 발명에 의하면, 하부지지격자에 조립되는 슬리브를 단일 슬리브로 구성함으로써 기존의 절반에 해당하는 4개의 슬리브가 필요하며, 이에 따라 안내관 및 하부지지격자에 슬리브를 조립하기 위한 공정이 감소되고, 더욱이 안내관에 슬리브를 용접하기 위한 공정수가 현저히 줄어들게 된다.
According to the present invention configured as described above, four sleeves corresponding to the existing half is required by configuring the sleeve assembled to the lower support grid as a single sleeve, and thus, a process for assembling the sleeve to the guide tube and the lower support grid is performed. And furthermore, the number of processes for welding the sleeve to the guide tube is significantly reduced.

도 1은 일반적인 핵연료집합체의 개략도 및 하부지지격자의 평면도.
도 2는 종래 기술에 의한 슬리브가 하부지지격자 및 안내관에 조립된 상태를 보인 개략도.
도 3은 본 발명에 의한 슬리브가 하부지지격자 및 안내관에 조립된 상태를 보인 개략도.1 is a schematic view of a typical fuel assembly and a plan view of a lower support grid;
Figure 2 is a schematic view showing a state in which the sleeve is assembled to the lower support grid and the guide tube according to the prior art.
Figure 3 is a schematic view showing a state in which the sleeve is assembled to the lower support grid and the guide tube according to the present invention.

이하에서는, 본 발명에 의한 하부지지격자 고정용 단일 슬리브의 바람직한 실시예를 첨부 도면을 참고하여 설명한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of a single sleeve for fixing the lower support grid according to the present invention.

도 3에 도시된 바와 같이, 본 발명에 의한 단일 슬리브(100)는 안내관(2)이 삽입되도록 원통형의 중공체로 이루어지는 몸체(110), 몸체(110)의 일측에 형성되어 안내관(2)에 용접 결합되는 탄성 결합부(120)를 포함한다.As shown in Figure 3, the single sleeve 100 according to the present invention is formed on one side of the body 110, the body 110 of a cylindrical hollow body so that the guide tube 2 is inserted into the guide tube (2) It includes an elastic coupling portion 120 is welded to.

몸체(110)는 하부지지격자(1)의 높이보다 큰 길이를 갖는다. 즉, 본 실시예의 단일 슬리브(100)가 안내관(2)에 결합된 상태에서, 안내관(2)에 하부지지격자(1)가 결합될 경우 단일 슬리브(100)의 상부와 하부는 각각 하부지지격자(1)의 상ㆍ하측으로 소정량 돌출된다.Body 110 has a length greater than the height of the lower support grid (1). That is, in the state where the single sleeve 100 of the present embodiment is coupled to the guide tube 2, when the lower support grid 1 is coupled to the guide tube 2, the upper and lower portions of the single sleeve 100 are respectively lower A predetermined amount protrudes above and below the support grid 1.

몸체(110)의 상부에는 안내관과 용접 결합되는 탄성 결합부(120)가 마련된다. 이 탄성 결합부의 외주면에는 축 방향을 따라 절개한 절개부(121)가 축방향을 중심으로 방사상으로 형성된다. 한편, 절개부(121)는 안내관(2)과의 접촉시 그 접촉면에 요구되는 탄성에 따라 필요한 개수만큼 가감할 수 있다. 또한, 절개부(121)의 길이 또한 접촉면에 요구되는 탄성에 따라 필요한 만큼 그 길이를 가감할 수 있다.The upper portion of the body 110 is provided with an elastic coupling portion 120 which is welded to the guide tube. On the outer circumferential surface of the elastic coupling portion, a cutout portion 121 cut along the axial direction is formed radially about the axial direction. On the other hand, the incision 121 may be added or subtracted by the required number according to the elasticity required for the contact surface when contacting the guide tube (2). In addition, the length of the cutout 121 may also be added or subtracted as needed depending on the elasticity required for the contact surface.

그리고 몸체(110)의 상부와 하부 즉, 탄성 결합부(120)의 상단과 몸체(110)의 하단 외주면에는 각각 하부지지격자(1)의 위치를 고정할 수 있는 상ㆍ하부 받침턱(130)(140)이 몸체의 직경보다 큰 직경을 갖도록 몸체의 외 측으로 소정량 돌출 형성된다.And the upper and lower portions of the body 110, that is, the upper and lower support jaw 130, which can fix the position of the lower support grid 1, respectively, on the upper and lower outer peripheral surfaces of the elastic coupling portion 120 and the lower body 110; A predetermined amount protrudes to the outside of the body so that the 140 has a diameter larger than the diameter of the body.

본 실시예의 단일 슬리브(100)는 하부지지격자(1)의 안내관 위치의 격자셀에 탄성 결합부(120)가 윗쪽으로 삽입되어 하부지지격자(1)와 체결된다. 하부지지격자(1)의 격자셀에 삽입된 단일 슬리브(100)의 중공 내부로 안내관(2)이 삽입 결합된다. 이어 단일 슬리브(100)의 탄성 결합부(120)와 안내관(2)이 용접됨으로써 하부지지격자(1), 단일 슬리브(100) 및 안내관(2)의 조립이 완료되는 것이다. 이때, 하부지지격자(1)에 단일 슬리브(100)가 용이하게 삽입 안내될 수 있도록 상부 받침턱(130)의 상부에는 경사면(131)이 형성됨이 바람직하다.In the single sleeve 100 of the present embodiment, the elastic coupling part 120 is inserted upward in the lattice cell at the position of the guide tube of the lower support grid 1 so as to be fastened with the lower support grid 1. The guide tube 2 is inserted into the hollow inside of the single sleeve 100 inserted into the lattice cell of the lower support grid 1. Subsequently, the elastic coupling portion 120 and the guide tube 2 of the single sleeve 100 are welded to complete the assembly of the lower support grid 1, the single sleeve 100, and the guide tube 2. At this time, it is preferable that the inclined surface 131 is formed on the upper portion of the upper support jaw 130 so that the single sleeve 100 can be easily guided to the lower support grid (1).

이와 같이, 본 실시예에 의하면 하부지지격자(1)에 조립되는 슬리브를 단일 슬리브로 구성함으로써 하부지지격자 1개당 조립되는 슬리브의 개수를 기존의 절반으로 줄일 수 있으며, 이에 따라 안내관(2) 및 하부지지격자(1)에 슬리브를 조립하기 위한 공정이 감소되고, 더욱이 안내관에 슬리브를 용접하기 위한 공정수가 현저히 줄어들게 된다.
As described above, according to the present embodiment, by configuring the sleeve assembled to the lower support grid 1 as a single sleeve, the number of sleeves assembled per one lower support grid can be reduced to the existing half, and thus the guide tube 2 And the process for assembling the sleeve to the lower support grid 1 is reduced, and furthermore, the number of processes for welding the sleeve to the guide tube is significantly reduced.

100 ; 단일 슬리브 110 ; 몸체
120 ; 탄성 결합부 121 ; 절개부
130 ; 상부 받침턱 131 ; 경사면
140 ; 하부 받침턱100; Single sleeve 110; Body
120; Elastic coupling portion 121; Incision
130; Upper base 131; incline
140; Lower support

Claims (3)

안내관이 삽입되도록 원통형의 중공체로 이루어지며, 양단이 각각 하부지지격자의 상ㆍ하측으로 돌출 결합되는 몸체;
상기 몸체의 일 측에 형성되어 안내관에 용접 결합되는 탄성 결합부;
상기 탄성 결합부에 형성되는 다수의 절개부;를 포함하는 것을 특징으로 하는 핵연료집합체의 하부지지격자 고정용 단일 슬리브.
A body made of a cylindrical hollow body for inserting a guide tube, the both ends of which protrude to the upper and lower sides of the lower support grid;
An elastic coupling part formed at one side of the body and welded to the guide tube;
A single sleeve for fixing the lower support grid of the nuclear fuel assembly comprising a; a plurality of cutouts formed in the elastic coupling portion.
청구항 1에 있어서,
상기 몸체의 상부와 하부에는 각각 몸체의 직경보다 큰 직경을 갖는 상하부 받침턱이 형성되는 것을 특징으로 하는 핵연료집합체의 하부지지격자 고정용 단일 슬리브.
The method according to claim 1,
Single sleeve for fixing the lower support grid of the nuclear fuel assembly, characterized in that the upper and lower pedestal having a diameter larger than the diameter of the body is formed on the upper and lower portions of the body, respectively.
청구항 2에 있어서,
상기 상부 받침턱에는 단일 슬리브가 삽입을 안내하기 위한 경사면이 형성되는 것을 특징으로 하는 핵연료집합체의 하부지지격자 고정용 단일 슬리브.The method according to claim 2,
Single sleeve for fixing the lower support grid of the nuclear fuel assembly, characterized in that the upper support jaw is formed with a slope for guiding the insertion of a single sleeve.
KR1020100047396A 2010-05-20 2010-05-20 Single sleeve of nuclear fuel assembly for fixing bottom grid KR101125798B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170003702U (en) * 2016-04-18 2017-10-26 윤근철 The connecting pipe for air supply of heatexchaging system

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Publication number Priority date Publication date Assignee Title
JPH11160476A (en) * 1997-12-01 1999-06-18 Mitsubishi Heavy Ind Ltd Reactor fuel assembly
JP2000039487A (en) * 1998-07-22 2000-02-08 Mitsubishi Heavy Ind Ltd Skeleton structure for atomic reactor fuel assembly
JP4476519B2 (en) * 2001-05-24 2010-06-09 三菱原子燃料株式会社 Guide pin unit for mounting an upper nozzle of a fuel assembly and method for mounting an upper nozzle of a fuel assembly using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170003702U (en) * 2016-04-18 2017-10-26 윤근철 The connecting pipe for air supply of heatexchaging system

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