KR101069796B1 - Lapping Device for CEDM Upper Pressure Housing on Reactor Coolant Pressure Boundary - Google Patents

Lapping Device for CEDM Upper Pressure Housing on Reactor Coolant Pressure Boundary Download PDF

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KR101069796B1
KR101069796B1 KR1020090078165A KR20090078165A KR101069796B1 KR 101069796 B1 KR101069796 B1 KR 101069796B1 KR 1020090078165 A KR1020090078165 A KR 1020090078165A KR 20090078165 A KR20090078165 A KR 20090078165A KR 101069796 B1 KR101069796 B1 KR 101069796B1
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cedm
sealing surface
pressure housing
control element
pressure
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KR20110020514A (en
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최삼조
정환국
정민수
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한전케이피에스 주식회사
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
    • G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
    • G21C7/12—Means for moving control elements to desired position
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
    • 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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  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

본 발명은 원자로용 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면 래핑장치에 관한 것으로, 중공체로 이루어지며, 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면에 삽입 결합되는 조정 너트; 상기 조정 너트 내부에 관통 삽입되어 상승 또는 하강 안내되어 밀봉면을 래핑하는 승강 샤프트; 상기 승강 샤프트의 외주면에 결합되어 승강 샤프트가 일정한 래핑 압력을 유지하도록 탄성력을 부여하는 압축스프링; 상기 조정 너트의 상측으로 돌출되는 승강 샤프트의 상단에 결합되는 노브를 포함한다.The present invention relates to a sealing surface wrapping apparatus of a control element drive mechanism (CEDM) pressure housing for a nuclear reactor, and is made of a hollow body and inserted into the sealing surface of a control element driving mechanism (CEDM) pressure housing. Adjusting nut coupled; A lifting shaft inserted through the adjusting nut and guided upward or downward to wrap a sealing surface; A compression spring coupled to an outer circumferential surface of the lifting shaft to impart an elastic force so that the lifting shaft maintains a constant lapping pressure; And a knob coupled to an upper end of the elevating shaft protruding upward of the adjusting nut.

이와 같이 구성된 본 발명에 의하면, CEDM Vent System Special Device를 사용하여 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징 밀봉면에 대한 의심부위 및 결함부위에 대한 건전성을 사전에 점검 및 조치하여 RCS의 가압 및 가열시 누설 발생 가능성을 완벽하게 차단함으로써, 누설로 인한 RCS 감압 및 배수에 기인한 경제적 손실을 예방하고 원전 운영의 경제성과 안전성을 확보할 수 있다.According to the present invention configured as described above, the control element drive mechanism (CEDM) using the CEDM Vent System Special Device (CEDM) pressure housing sealing surface of the suspected and defective parts to check the integrity of the RCS in advance By completely blocking the possibility of leakage during pressurization and heating, it is possible to prevent economic losses due to RCS depressurization and drainage due to leakage, and to secure the economics and safety of nuclear power plant operations.

원자로, CEDM, 누설, 래핑 Reactor, CEDM, Leakage, Lapping

Description

원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치{Lapping Device for CEDM Upper Pressure Housing on Reactor Coolant Pressure Boundary}Wrapping device for CEDM Upper Pressure Housing on Reactor Coolant Pressure Boundary

본 발명은 원자력 발전소의 원자로(Reactor Vessel) 구성품 중 원자로 헤드(Reactor Head) 상부에 설치되어 원자로 냉각재 계통(Reactor Coolant System : 이하 RCS)의 압력경계부인 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(CEDM Upper Pressure Housing)에 대한 밀봉면의 누설 발생시 래핑을 수행하기 위한 밀봉면 래핑장치에 관한 것이다.The present invention is installed on top of a reactor head of a reactor vessel component of a nuclear power plant, and is a control element drive mechanism (CEDM) that is a pressure boundary of a reactor coolant system (RCS). A sealing surface wrapping apparatus for performing lapping in case of leakage of the sealing surface to the CEDM Upper Pressure Housing.

원자력 발전소는 보통 100개 이상의 개별적 기능을 가진 계통으로 구성된다. 이들은 크게 원자로를 중심으로 한 핵증기 공급계통과 이 증기를 공급받아 발전기를 돌리는 터빈, 발전기계통 및 기타 부수설비로 구분된다.Nuclear power plants usually consist of more than 100 individual functions. These are largely divided into a nuclear steam supply system centered on a nuclear reactor and a turbine, a generator system, and other ancillary equipment for receiving the steam to run a generator.

도 1에 도시된 바와 같이, 원자로(1)는 핵폭발시 순간적으로 방출되는 다량의 에너지가 서서히 방출되도록 조절함으로써 핵에너지를 실생활에 활용할 수 있도록 하는 기능을 가지며, 특히 원자로는 핵분열성 물질의 연쇄 핵분열반응을 인공적으로 제어하여 열을 발생시키거나 방사성 동위원소 및 플루토늄의 생산, 또는 방사 선장 형성 등의 여러 목적에 사용할 수 있도록 만들어진 장치이다.As shown in FIG. 1, the reactor 1 has a function to utilize nuclear energy in real life by regulating so that a large amount of instantaneous energy is released at the time of a nuclear explosion, and in particular, the nuclear reactor is a chain nuclear fission of fissile material. It is a device designed to be used for various purposes such as generating heat by artificially controlling a reaction, producing radioisotopes and plutonium, or forming a radiation captain.

일반적으로 원자력 발전소에는 비상시 노심을 냉각시키는 동시에 이 노심의 반응도를 제어하기 위해 원자로 노심에 붕산수를 주입하여 원자로의 안전을 확보하고 발전소 정지시 원자로 냉각재를 냉각시키기 위한 안전주입계통이 설계되어 있다. 이 계통에는 도 2에 도시된 바와 같이, 정상 운전 중 고온, 고압 및 고방사성 원자로 냉각재 계통(Reactor Coolant System;RCS)이 안전주입계통으로 역류하는 것을 방지하기 위한 각종의 밸브가 설치되어 있으며 이러한 밸브들의 내, 외부 누설이 발생하지 않도록 관리되고 있다.In general, a nuclear power plant is designed with a safety injection system to secure reactor safety by injecting boric acid into the reactor core to control the reactor's responsiveness while cooling the core in an emergency. As shown in FIG. 2, a variety of valves are installed to prevent the high temperature, high pressure, and high radioactive reactor coolant system (RCS) from flowing back into the safety injection system during normal operation. It is managed so that internal and external leakage does not occur.

한편, 원자로는 2개의 냉각재 회로를 가진 가압경수로로서 원자로 냉각재 계통은 폐쇄회로 내에서 냉각수를 순환하는데, 가압 경수로형 원자력 발전소에서는 원자로 냉각재 계통의 압력을 일정하게 유지하는 가압기 계통의 안전밸브의 성능시험을 실시하게 되는데, 이와 같이 RCS 압력경계 분해점검을 위한 종래 원자로 냉각재계통의 배수방법을 첨부한 도면을 참조하여 상세히 설명하면 다음과 같다.On the other hand, the reactor is a pressurized water reactor having two coolant circuits, and the reactor coolant system circulates the coolant in a closed circuit.In a pressurized water reactor type nuclear power plant, the performance test of the safety valve of the pressurizer system that maintains the pressure of the reactor coolant system is constant. This will be described in detail with reference to the accompanying drawings, the method of draining the conventional reactor coolant system for the RCS pressure boundary decomposition check as follows.

우선, 원자력 발전소는 계획예방정비 후 원자로의 출력 운전을 위해 선행되는 작업으로 RCS의 공기를 배출하는 작업을 수행한다.First of all, the nuclear power plant is responsible for releasing the air from the RCS, which is a prerequisite for operating the reactor output after planned preventive maintenance.

그리고 RCS의 공기배출을 위해서는 정적배기와 동적배기가 수행되며 동적배기 시(RCS 온도 65.5℃, 압력 35㎏/㎠ 이하) 원자로 헤드 상부에 CEDM(Control Element Drive Mechanism) 압력하우징(10)의 VERSA Vent System(20)에 의한 배기작업이 수행된다.In addition, static and dynamic exhaust is performed for air discharge of the RCS. During dynamic exhaust (RCS temperature 65.5 ° C., pressure below 35 kg / ㎠), the VERSA Vent of the CEDM (Control Element Drive Mechanism) pressure housing 10 is placed on the upper part of the reactor head. Exhaust work by the system 20 is performed.

한편, 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)은 VERSA Vent System(20)의 벤트 볼(Vent Ball)(11)과 벤트 스템(Vent Stem)(12)에 의해 밀봉되어 RCS 압력(정상 운전 중 RCS 압력 158㎏/㎠) 경계부를 형성하며, VERSA Vent System(20)은 매 3주기마다 벤트 볼과 오링(O-Ring) 등을 교체하고 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 밀봉면를 육안으로 점검한다.On the other hand, the control element drive mechanism (CEDM) pressure housing 10 is sealed by the vent ball 11 and the vent stem 12 of the VERSA Vent System 20 and the RCS is sealed. Pressure (RCS pressure 158㎏ / ㎠ during normal operation) forms a boundary, VERSA Vent System (20) replaces the vent ball and O-ring every three cycles, and control element drive (CEDM, Control Element Drive) Mechanism) Visually inspect the sealing surface of the pressure housing (10).

하지만, 기존에는 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면에 대해 육안 점검만을 수행함으로써 의심부위 및 결함부위에 대한 건전성을 사전에 확인하는 방법이 마련되어 있지 않아, 재 정비작업을 위해서는 RCS의 감압 및 배수 작업 후 밀봉(Plugging) 조치를 취하게 되는데, 이러한 경우 공정지연으로 인한 발전소의 경제적 손실을 초래할 수 있다.However, in the past, there is no method for confirming the integrity of suspicious and defective areas by performing visual inspection only on the sealing surface of the control element drive mechanism (CEDM) pressure housing. In order to achieve this, sealing measures are taken after decompression and drainage of RCS, which can cause economic loss of power plant due to process delay.

예컨대, 과거 RCS 동적 배기 시 원자로 상부 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 VERSA Vent System에 의한 배기작업 후 벤트 시스템(Vent System)의 누수(Leak) 발생으로 인하여 RCS 감압 및 배수(140' 이하) 작업 후 해당부위를 밀봉(Plugging) 조치한 작업사례가 있었으며, 관련 작업으로 인해 주공정이 7시간 이상 지연되었다.For example, RCS pressure reduction and drainage due to leakage of vent system after venting by VERSA Vent System of CEDM pressure control housing during RCS dynamic exhaustion 140 'or less) There was a case of sealing the part after the operation, and the related process delayed the main process more than 7 hours.

이와 같이 기존에는 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징 밀봉면의 육안 점검 후 벤트 볼과 벤트 스템 등 VERSA Vent System을 조립하고 RCS의 가압시 누설 여부를 확인하여 누설 발생시 감압 및 배수 후 밀봉(Plugging) 조치하는 방법이었으나, 본 발명은 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징 밀봉면에 대한 의심부위 및 결함부위에 대한 건전성을 점검한 이후 RCS의 가압 및 가열시 누설 발생 가능성을 용이하고 안정적으로 조치함으로써, 누설로 인한 RCS 감압 및 배수에 기인한 경제적 손실을 예방하고 원전 운영의 경제성과 안전성을 확보할 수 있는 원자로용 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면 래핑장치를 제공하는데 그 목적이 있다.In this way, the control element drive mechanism (CEDM) has been visually inspected on the sealing surface of the pressure housing, assembled the VERSA Vent System such as the vent ball and the vent stem, and checked for leakage during pressurization of the RCS. Although the sealing method was a method of the present invention, the present invention provides a possibility of occurrence of leakage during pressurization and heating of the RCS after checking the integrity of suspicious and defective parts on the control surface of a control element drive mechanism (CEDM) pressure housing. Control element drive mechanism (CEDM) pressure housing to prevent economic loss due to RCS decompression and drainage due to leakage and to secure economic and safety of nuclear power plant operation. It is an object of the present invention to provide a sealing surface wrapping device.

상술한 과제를 해결하기 위하여, 본 발명에서는 중공체로 이루어지며, 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면에 삽입 결합되는 조정 너트; 상기 조정 너트 내부에 관통 삽입되어 상승 또는 하강 안내되어 밀봉면을 래핑하는 승강 샤프트; 상기 승강 샤프트의 외주면에 결합되어 승강 샤프트가 일정한 래핑 압력을 유지하도록 탄성력을 부여하는 압축스프링; 상기 조정 너트의 상측으로 돌출되는 승강 샤프트의 상단에 결합되는 노브를 포함하는 원자로용 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면 래핑장치가 제공된다.In order to solve the above problems, the present invention is made of a hollow body, control element drive (CEDM, Control Element Drive Mechanism) adjustment nut inserted into the sealing surface of the pressure housing; A lifting shaft inserted through the adjusting nut and guided upward or downward to wrap a sealing surface; A compression spring coupled to an outer circumferential surface of the lifting shaft to impart an elastic force so that the lifting shaft maintains a constant lapping pressure; Provided is a sealing surface wrapping apparatus for a control element drive mechanism (CEDM) pressure housing including a knob coupled to an upper end of a lifting shaft protruding upward of the adjusting nut.

이와 같이 구성된 본 발명에 의하면 다음과 같은 효과가 있다.According to the present invention configured as described above has the following effects.

첫째, RCS 압력경계부 누설시험 및 조치방법의 신뢰성 및 품질을 확보함으로써 원전 운전의 안전성 제고 및 계획예방정비 주공정 지연 예방에 기여할 수 있다.First, by securing the reliability and quality of the RCS pressure boundary leakage test and measures, it can contribute to improving safety of nuclear power plant operation and preventing main process delays.

둘째, 원자로 구성품 및 원전연료의 손상예방으로 원자력 발전 이용률을 향상시킬 수 있다.Second, the prevention of damage to reactor components and nuclear fuel can improve the utilization of nuclear power.

셋째, 원자로 압력경계부 사전 점검을 통해 원자력 발전 산업의 안전성을 도모할 수 있고, 작업자와 작업공정의 안전성을 확보하며, 밀봉면 건전성 확인 시험을 조기에 수행하여 기기 손상을 예방함으로써 고객으로부터 기술능력 및 정비 신뢰성을 향상시킬 수 있다.Third, through the preliminary inspection of the reactor pressure boundary, the safety of the nuclear power industry can be promoted, the safety of workers and work processes can be secured, and the integrity of the sealing surface can be checked early to prevent damage to the equipment. Improved maintenance reliability

이하에서는, 본 발명에 의한 원자로용 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면 래핑장치의 바람직한 실시예를 첨부 도면을 참고하여 설명한다.Hereinafter, a preferred embodiment of a sealing surface wrapping apparatus for a control element drive mechanism (CEDM) pressure housing according to the present invention will be described with reference to the accompanying drawings.

도시된 바와 같이, 본 발명의 밀봉면 래핑장치(R)는 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 밀봉면의 결함 또는 누설감지장치(도시 생략)를 통한 누설이 확인되면 밀봉면의 이상상태를 조치하기 위한 장치로서, 그 주요 구성품은 다음과 같다.As shown, the sealing surface wrapping device (R) of the present invention is the sealing surface when the defect of the sealing surface of the control element drive (CEDM) pressure housing or leak through the leak detection device (not shown) is confirmed. Apparatus for dealing with abnormal conditions of

즉, 본 발명의 래핑장치(R)는 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징에 삽입되는 조정 너트(40)(Adjustable Nut), 조정 너트(40) 내부에 삽입 결합되는 승강 샤프트(44), 승강 샤프트(44)의 외주면에 결합되는 압축스프링(45), 조정 너트(40)의 상측에 결합되는 노브(46)를 포함한다.That is, the lapping apparatus R of the present invention includes an adjustment nut 40 (Adjustable Nut) inserted into the control element drive mechanism (CEDM) pressure housing, and a lifting shaft inserted into the adjustment nut 40. 44, a compression spring 45 coupled to the outer circumferential surface of the elevating shaft 44, and a knob 46 coupled to the upper side of the adjustment nut 40.

조정 너트(40)는 원통형의 중공체로 이루어진다. 즉, 그 내부에는 승강 샤프트(44)의 상승 또는 하강을 안내할 수 있도록 수직 방향으로 샤프트홀(44a)이 길게 형성된다. 따라서, 조정 너트(40)는 래핑장치의 전체 구성요소를 지지한 상태에서 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징에 래핑장치를 체결하고, 승강 샤프트(44)의 가이드 역할을 한다.The adjusting nut 40 consists of a cylindrical hollow body. That is, the shaft hole 44a is formed long in the vertical direction so as to guide the rising or falling of the lifting shaft 44. Accordingly, the adjusting nut 40 fastens the wrapping device to the control element drive mechanism (CEDM) pressure housing while supporting the entire components of the wrapping device, and serves as a guide of the lifting shaft 44.

이때, 조정 너트(40)의 상단에는 수평으로 핸들이 결합되어 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)에 래핑장치의 결합을 용이하게 하며, 조정 너트(40)의 하단에는 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 밀봉면에 삽입되도록 삽입부(41)가 일체로 형성되고, 조정 너트(40)의 삽입부(41) 경계 부위에는 그 둘레를 따라 소정 깊이로 오목하게 안착홈(41a)이 형성되며, 이 안착홈(41a)에는 오링(42)이 결합됨으로써 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10) 내의 압력을 유지해 준다.At this time, the handle is horizontally coupled to the upper end of the adjustment nut 40 to facilitate the coupling of the wrapping device to the control element drive mechanism (CEDM) pressure housing 10, the lower end of the adjustment nut 40 Control element drive mechanism (CEDM) Insertion portion 41 is integrally formed to be inserted into the sealing surface of the pressure housing 10, the peripheral portion of the insertion portion 41 of the adjustment nut 40 The recess 41a is formed to be concave to a predetermined depth. The O-ring 42 is coupled to the recess 41a to maintain the pressure in the control element drive mechanism (CEDM) pressure housing 10. .

승강 샤프트(44)는 조정 너트(40)의 샤프트홀의 내경에 대응되는 외경을 가지며, 그 상단에는 노브(46)에 결합되도록 체결부(44a)가 일체로 형성되며, 체결부(44a)의 외주면에는 나사산이 형성된다. 승강 샤프트(44)의 하부 외주면에는 단턱(44c)이 형성되고, 이 단턱(44c)에는 스프링 와셔(45a)가 안착되어 압축스프링(45)을 지지해 준다.The lifting shaft 44 has an outer diameter corresponding to the inner diameter of the shaft hole of the adjustment nut 40, and a fastening portion 44a is integrally formed at the upper end thereof so as to be coupled to the knob 46, and an outer peripheral surface of the fastening portion 44a. The thread is formed. A step 44c is formed on the lower outer circumferential surface of the lifting shaft 44, and a spring washer 45a is seated on the step 44c to support the compression spring 45.

이러한 승강 샤프트(44)는 조정 너트(40)에 안내되어 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 밀봉면에 접촉하여 래핑제와 함께 밀봉면을 래핑한다. 승강 샤프트(44)의 내부에는 수직 방향으로 길게 플러그홀(44b)이 형성된다.This lifting shaft 44 is guided to the adjusting nut 40 to contact the sealing surface of the control element drive mechanism (CEDM) pressure housing 10 to wrap the sealing surface together with the lapping agent. The plug hole 44b is formed in the lifting shaft 44 in the vertical direction.

압축스프링(45)은 축방향으로 소정량 압축됨으로써 조정 너트(40)에 의해 승 강 샤프트(44)를 균등하게 눌러주며, 이와 같이 압축스프링(45)으로 승강 샤프트(44)의 누르는 압력을 조절하여 래핑의 정밀도를 높여준다. 이때, 승강 샤프트(44)의 단턱(44c)에는 압축스프링(45)을 지지할 수 있도록 스프링 와셔(45a)가 구비됨이 바람직하다.The compression spring 45 is compressed in the axial direction by a predetermined amount to equally press the lifting shaft 44 by the adjusting nut 40, and thus adjusts the pressing pressure of the lifting shaft 44 by the compression spring 45. To increase the accuracy of the wrapping. At this time, it is preferable that the spring washer 45a is provided at the step 44c of the lifting shaft 44 so as to support the compression spring 45.

노브(46)는 작업자가 래핑 작업을 보다 손쉽게 할 수 있도록 하는 것으로, 그 외주면에는 작업자가 용이하게 파지할 수 있도록 복수의 파지홈이 형성된다. 노브(46)의 내주면에는 승강 샤프트(44)의 체결부(44a)에 나사 결합되도록 태핑 가공되어 있다. 그리고 승강 샤프트(44)와 마찬가지로 노브(46)의 중앙에도 수직 방향으로 플러그홀(46a)이 형성된다.The knob 46 allows the worker to easily wrap, and a plurality of gripping grooves are formed on the outer circumferential surface of the knob 46 so that the worker can easily grip. The inner circumferential surface of the knob 46 is tapped to be screwed to the fastening portion 44a of the lifting shaft 44. Similarly to the lifting shaft 44, the plug hole 46a is formed in the center of the knob 46 in the vertical direction.

플러그(48)는 노브(46) 및 승강 샤프트(44)의 플러그홀(46a)(44b)에 삽입되도록 원통형의 긴 봉 형상으로 이루어지며, 압력하우징(10)의 밀봉면(10a) 래핑 작업시 래핑제 및 래핑 부산물 등의 이물질이 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징 내부로 유입되는 것을 방지한다. 플러그(48)의 상단에는 플러그가 노브(46) 및 승강 샤프트(44)의 플러그홀(46a)(44b)로부터 이탈되는 것을 방지하기 위한 머리부(48a)가 형성되고, 하단 외주면에는 보다 확실한 기밀성을 유지하도록 고무 등의 기밀부재(48b)가 결합된다.The plug 48 has a cylindrical long rod shape to be inserted into the knob 46 and the plug holes 46a and 44b of the elevating shaft 44, and when the sealing surface 10a of the pressure housing 10 is wrapped. It prevents foreign substances such as lapping agent and lapping by-products from entering the control element drive mechanism (CEDM) pressure housing. A head 48a is formed at the upper end of the plug 48 to prevent the plug from being disengaged from the knob 46 and the plug holes 46a and 44b of the elevating shaft 44, and more secure airtightness at the lower outer peripheral surface. The airtight member 48b, such as rubber, is coupled to hold the same.

이와 같이 구성된 본 실시예의 누설감지장치를 이용한 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징의 건전성을 확인하고 조치하는 과정을 설명하면 다음과 같다.Referring to the process of checking and correcting the integrity of the control element drive mechanism (CEDM) pressure housing using the leak detection device of the present embodiment configured as described above are as follows.

제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 건전성을 확인하기 위해 육안점검을 수행하고 벤트 볼(11)과 벤트 스템(12)이 조립(토오크 300±25 in-lbs)된 상태에서 VERSA Vent System(20)을 분리하고, 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)에 누설감지장치를 설치한 후 수압펌프와 압력게이지를 이용하여 누설시험[Test 압력 30㎏/㎠]을 수행하여 건전성을 확인한다.Control Element Drive Mechanism (CEDM) A visual inspection is performed to verify the integrity of the pressure housing (10) and the vent ball (11) and the vent stem (12) are assembled (torque 300 ± 25 in-lbs). Remove the VERSA Vent System (20) in the state, install the leak detection device in the control element drive mechanism (CEDM) pressure housing (10), and then leak test using the hydraulic pump and pressure gauge [Test pressure 30 Kg / cm 2] to confirm soundness.

이때, 누설이 확인되면 누설감지장치를 제거하고, 벤트 스템(12)과 벤트 볼(11)을 분리한 후, 승강 샤프트(44)에 래핑제를 도포하여 조정 너트(40)를 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)에 장착한다.At this time, if leakage is confirmed, the leak detection device is removed, the vent stem 12 and the vent ball 11 are separated, and a lapping agent is applied to the lifting shaft 44 to adjust the adjustment nut 40 to the control rod driving device ( CEDM, Control Element Drive Mechanism) It is mounted on the pressure housing (10).

승강 샤프트(44)의 래핑면이 적정 압력을 받을 수 있도록 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 밀봉면에 밀착시킨 후 래핑 작업을 시작한다.The wrapping surface of the elevating shaft 44 is brought into close contact with the sealing surface of the control element drive mechanism (CEDM) pressure housing 10 so as to receive an appropriate pressure.

즉, 작업자가 노브(46)를 회전시키면 승강 샤프트(44)의 래핑면이 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 밀봉면에 접촉되면서 래핑 작업이 수행되는 것이다. 이때 압축스프링(45)이 밀리면서 밀봉면에 면압을 형성하게 되고, 플러그(48)는 밀봉면의 통로를 밀폐시킴으로써 래핑제가 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 내부로 유입되는 것을 방지한다.That is, when the operator rotates the knob 46, the lapping surface of the lifting shaft 44 is in contact with the sealing surface of the control element drive mechanism (CEDM) pressure housing 10 to perform the lapping operation. At this time, the compression spring 45 is pushed to form a surface pressure on the sealing surface, and the plug 48 seals the passages of the sealing surface so that the wrapping agent is inside the control element drive mechanism (CEDM) pressure housing 10. To prevent ingress.

래핑 작업이 완료된 후에는 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)에서 래핑장치(R)를 제거하고, 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)에 벤트 볼(11)과 벤트 스템(12)을 재조립하고 누설시험을 수행하여 건전성을 재확인한다.After the lapping is completed, remove the wrapping device (R) from the control element drive mechanism (CEDM) pressure housing (10), and vent the control element drive mechanism (CEDM) pressure housing (10). Reassemble the ball (11) and vent stem (12) and perform a leak test to recheck the integrity.

도 1은 일반적인 원자로를 도시한 개략도.1 is a schematic representation of a typical reactor.

도 2는 도 1에 따른 CEDM VERSA Vent System을 보인 단면도.2 is a cross-sectional view showing a CEDM VERSA Vent System according to FIG.

도 3은 본 발명에 의한 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치를 보인 사시도.Figure 3 is a perspective view showing a sealing surface wrapping apparatus of a control rod drive device (CEDM) pressure housing for the reactor according to the present invention.

도 4는 본 발명에 의한 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치를 보인 분해도.Figure 4 is an exploded view showing the sealing surface wrapping device of the control rod drive device (CEDM) pressure housing for the reactor according to the present invention.

도 5는 본 발명의 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치가 적용된 제어봉구동장치(CEDM)을 보인 단면도.Figure 5 is a cross-sectional view showing a control rod driving device (CEDM) to which the sealing surface wrapping device of the control rod control device (CEDM) pressure housing for the reactor of the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

10 ; 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징 20 ; VERSA Vent System10; Control Element Drive Mechanism (CEDM) Pressure Housing 20; VERSA Vent System

40 ; 조정 너트 41 ; 삽입부40; Adjusting nut 41; Insert

42 ; 오링 43 ; 핸들42; O-ring 43; handle

44 ; 승강 샤프트 45 ; 압축스프링44; Lifting shaft 45; Compression Spring

46 ; 노브 47 ; 너트46; Knob 47; nut

48 ; 플러그48; plug

Claims (5)

중공체로 이루어지며, 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10)의 밀봉면에 삽입 결합되는 조정 너트(40);An adjustment nut 40 made of a hollow body and inserted into and coupled to a sealing surface of a control element drive mechanism (CEDM) pressure housing 10; 상기 조정 너트(40) 내부에 관통 삽입되어 상승 또는 하강 안내되어 밀봉면을 래핑하는 승강 샤프트(44);A lifting shaft 44 inserted through the adjusting nut 40 to be guided up or down to wrap the sealing surface; 상기 승강 샤프트(44)의 외주면에 결합되어 승강 샤프트(44)가 일정한 래핑 압력을 유지하도록 탄성력을 부여하는 압축스프링(45); 및A compression spring 45 coupled to an outer circumferential surface of the elevating shaft 44 to impart an elastic force so that the elevating shaft 44 maintains a constant lapping pressure; And 상기 조정 너트(40)의 상측으로 돌출되는 승강 샤프트(44)의 상단에 결합되는 노브(46)를 포함하는 것을 특징으로 하는 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치.Sealing surface wrapping apparatus for a control rod control device (CEDM) pressure housing for the reactor characterized in that it comprises a knob (46) coupled to the upper end of the elevating shaft (44) protruding upwards of the adjustment nut (40). 청구항 1에 있어서,The method according to claim 1, 상기 승강 샤프트(44)의 외주면에는 압축스프링(45)을 지지하기 위한 스프링 와셔(45a)가 결합되는 것을 특징으로 하는 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치.Sealing surface wrapping apparatus of the CEDM pressure housing, characterized in that the spring washer (45a) for supporting the compression spring 45 is coupled to the outer circumferential surface of the elevating shaft (44). 청구항 1 또는 2에 있어서,The method according to claim 1 or 2, 상기 승강 샤프트(44)의 내부에는 이물질이 제어봉구동장치(CEDM, Control Element Drive Mechanism) 압력하우징(10) 내부로 유입되는 것을 방지하는 플러그(48)가 삽입되는 것을 특징으로 하는 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치.The control rod drive device for the reactor, characterized in that the plug 48 is inserted into the lifting shaft 44 to prevent foreign matter from entering the control element drive mechanism (CEDM) pressure housing 10. (CEDM) Sealing wrapping device for pressure housings. 청구항 3에 있어서,The method of claim 3, 상기 플러그(48)의 끝단 외주면에는 기밀부재(48b)가 결합되는 것을 특징으로 하는 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치.Sealing surface wrapping apparatus of the CEDM pressure housing, characterized in that the airtight member (48b) is coupled to the outer peripheral surface of the end of the plug (48). 청구항 1 또는 2에 있어서,The method according to claim 1 or 2, 상기 승강 샤프트(44)의 상단에는 노브(46)와 결합되도록 외주면에 나사산이 형성된 체결부(44a)가 마련되는 것을 특징으로 하는 원자로용 제어봉구동장치(CEDM) 압력하우징의 밀봉면 래핑장치.Sealing surface wrapping apparatus of the CEDM pressure housing, characterized in that the upper end of the elevating shaft 44 is provided with a fastening portion (44a) is formed on the outer peripheral surface to be coupled to the knob 46.
KR1020090078165A 2009-08-24 2009-08-24 Lapping Device for CEDM Upper Pressure Housing on Reactor Coolant Pressure Boundary KR101069796B1 (en)

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KR101974790B1 (en) 2018-10-05 2019-05-02 한전케이피에스 주식회사 Apparatus and method for lapping of valve plug

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KR101974790B1 (en) 2018-10-05 2019-05-02 한전케이피에스 주식회사 Apparatus and method for lapping of valve plug

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