JPH0447489Y2 - - Google Patents
Info
- Publication number
- JPH0447489Y2 JPH0447489Y2 JP1983104598U JP10459883U JPH0447489Y2 JP H0447489 Y2 JPH0447489 Y2 JP H0447489Y2 JP 1983104598 U JP1983104598 U JP 1983104598U JP 10459883 U JP10459883 U JP 10459883U JP H0447489 Y2 JPH0447489 Y2 JP H0447489Y2
- Authority
- JP
- Japan
- Prior art keywords
- screw hole
- screw
- plug
- bolt
- holding plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004078 waterproofing Methods 0.000 claims description 13
- 238000012856 packing Methods 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 239000000446 fuel Substances 0.000 description 12
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 8
- 238000007689 inspection Methods 0.000 description 4
- 239000003758 nuclear fuel Substances 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002915 spent fuel radioactive waste Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Gasket Seals (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Description
【考案の詳細な説明】
（技術分野）
本考案は原子炉圧力容器胴体フランジねじ穴上
部ねじ逃げ部に設置して防水シールを行なう胴体
フランジねじ穴防水装置に関するものである。[Detailed Description of the Invention] (Technical Field) The present invention relates to a fuselage flange screw hole waterproofing device that is installed in the upper screw relief part of the fuselage flange screw hole of a reactor pressure vessel to provide a waterproof seal.
（従来技術）
従来、原子炉は通常１年に１回定期検査のため
停止される。この定期検査中に１部の核燃料は新
燃料に取替えるため、原子炉圧力容器から燃料プ
ールへ移動される。この使用済燃料は強い放射能
を持つているため放射線遮へいが必要であり原子
炉ウエルに水（軽水）を張り満水の状態で行なわ
れる。(Prior Art) Conventionally, nuclear reactors are normally shut down once a year for periodic inspections. During this periodic inspection, some nuclear fuel is moved from the reactor pressure vessel to the fuel pool to be replaced with new fuel. Because this spent fuel has strong radioactivity, radiation shielding is necessary, and the reactor well is filled with water (light water).
第１図にて説明すれば、定期検査時、原子炉圧
力容器１の上蓋（図示省略）を取外し、原子炉ウ
エルRWにプール水Ｗを満水した後、原子炉圧力
容器１内から使用済核燃料を取出し経路Ａのよう
に燃料プールFPに水中移動される。取替のため
の新燃料Ｆは経路Ｂによつて原子炉圧力容器１に
移動される。 To explain with reference to FIG. 1, during periodic inspection, after removing the top cover (not shown) of the reactor pressure vessel 1 and filling the reactor well RW with pool water W, the spent nuclear fuel is removed from the reactor pressure vessel 1. The fuel is taken out and moved underwater to the fuel pool FP as shown in route A. New fuel F for replacement is transferred to the reactor pressure vessel 1 via route B.
原子炉圧力容器１の胴体フランジ２に植込まれ
たスタツドボルト３は燃料を移動する際に邪魔に
なるので数十本のスタツドボルト３は取外され、
取外したねじ穴２ａは原子炉ウエルRWを満水す
るために水没し発錆する。 The stud bolts 3 embedded in the fuselage flange 2 of the reactor pressure vessel 1 would get in the way when moving the fuel, so several dozen stud bolts 3 were removed.
The removed screw hole 2a is submerged in water to fill the reactor well RW with water, causing rust.
この錆はねじのかじりの原因になるため取除く
必要がある。また、このねじ穴に溜つた水抜きも
必要で、従来この錆落しおよび水抜きは手動ポン
を用いて水抜きをし、ブラシを用いて錆の除去を
行ないさらにウエスで清掃を行なつていた。 This rust must be removed as it causes galling of the screws. It is also necessary to drain water that has accumulated in this screw hole, and conventionally, this rust removal and water drainage was done using a manual pump, removing the rust using a brush, and then cleaning with a rag. .
これらはいずれも手作業であるため、多くの作
業時間と労力とを必要とし、作業場所が放射線雰
囲気下にあることから被爆線量も多かつた。 All of this work was done manually, requiring a lot of time and effort, and the work area was in a radiation atmosphere, resulting in a high radiation dose.
（本考案の目的）
本考案の目的は、上記した従来技術の欠点をな
くし、燃料取替時のプール水から胴体フランジね
じ穴を防水シールし、錆の発生防止および水抜き
作業を不要とする胴体フランジねじ穴防水装置を
提供するにある。(Purpose of the present invention) The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, and to waterproof seal the fuselage flange screw holes from pool water during fuel replacement, prevent rust from occurring, and eliminate the need for water drainage. There is a screw hole in the fuselage flange to provide a waterproof device.
（本考案の構成）
要するに本考案は、原子炉圧力容器の胴体フラ
ンジに形成され、上端にねじ逃げ部とねじ穴傾斜
部とを有するスタツドボルト用ねじ穴を防水する
胴体フランジねじ穴防水装置において、
前記ねじ穴傾斜部の傾斜面に接する接触面を有
し、その反対面のねじ逃げ部側の面にパツキング
部材を装着した円周溝を有するプラグと、
該プラグの円周溝に相対して設けられ、前記ね
じ逃げ部の径より小さい円板状の押え板と、
前記プラグの中心部に固定され、前記押え板を
貫通するボルトと、
該ボルトに螺合され、スペーサを介して前記押
え板側に前進して押え板を押圧させるハンドル
と、
を備えたことを特徴とする胴体フランジねじ穴防
水装置である。(Structure of the present invention) In short, the present invention provides a fuselage flange screw hole waterproofing device for waterproofing a screw hole for a stud bolt, which is formed in the fuselage flange of a reactor pressure vessel and has a screw relief portion and a screw hole slope portion at the upper end. , a plug having a contact surface in contact with the slope of the screw hole slope, and a circumferential groove having a packing member attached to the surface opposite to the contact surface on the screw clearance side; a disc-shaped holding plate provided with a diameter smaller than the diameter of the screw relief portion; a bolt fixed to the center of the plug and passing through the holding plate; A fuselage flange screw hole waterproofing device characterized by comprising: a handle that moves forward toward the presser plate to press the presser plate; and a handle that presses the presser plate.
（本考案の作用）
前述の核燃料の取替え作業を行なう場合、先ず
邪魔になるスタツドボルト３を抜いた直後に、本
考案になる防水装置を設置し、その後満水させて
燃料交換を行ない、排水後に防水装置を取外すも
のであるから、ねじ穴に水の浸入することはな
く、従つて水抜き作業も不要で発錆のおそれも全
くない。(Operation of the present invention) When carrying out the above-mentioned nuclear fuel replacement work, first, immediately after removing the stud bolt 3 that gets in the way, the waterproofing device of the present invention is installed, then it is filled with water, the fuel is replaced, and after draining, the waterproofing device of the present invention is installed. Since the waterproof device is removed, water does not enter the screw holes, and there is no need to drain water and there is no risk of rust.
（本考案の実施例）
本考案は実施例に基き図面に従つて説明する。
第２図は実施例の断面図であり、第３図は第２図
のＡ−Ａ矢視図、第４図は第２図のＢ部拡大断面
図である。(Embodiments of the present invention) The present invention will be explained based on embodiments and with reference to the drawings.
2 is a sectional view of the embodiment, FIG. 3 is a view taken along the line A--A in FIG. 2, and FIG. 4 is an enlarged sectional view of section B in FIG.
第２図は第１図の原子炉圧力容器１の胴体フラ
ンジ２のねじ穴２ａに本考案の防水装置を実施し
た場合の拡大した断面図である。 FIG. 2 is an enlarged sectional view when the waterproofing device of the present invention is installed in the screw hole 2a of the fuselage flange 2 of the reactor pressure vessel 1 shown in FIG.
原子炉圧力容器１の胴体フランジ２に形成され
たねじ穴２ｂの上端末部は傾斜部２ｅ及びねじ逃
げ部２ｃとなつている。プラグ４はねじ逃げ部２
ｃの内径よりも小さい外径を有する円板状に形成
され、その下面（ねじ穴挿入側）は円錐状部に形
成され、これに連接して円柱状部を備えている。 The upper end portion of the screw hole 2b formed in the fuselage flange 2 of the reactor pressure vessel 1 forms an inclined portion 2e and a screw relief portion 2c. Plug 4 has screw relief part 2
It is formed into a disc shape having an outer diameter smaller than the inner diameter of c, and its lower surface (screw hole insertion side) is formed into a conical part, and a cylindrical part is provided in connection with this conical part.
プラグ４の円錐状部の斜面部は、ねじ穴２ｂの
上端末部の傾斜部２ｅに対応した形状となつてお
り、プラグ４の円柱状部はねじ逃げ部２ｅに対応
した形状に形成され、その周側面に沿つて形成さ
れた環状溝にＯリングパツキン１０が装着され
る。 The sloped part of the conical part of the plug 4 has a shape corresponding to the sloped part 2e of the upper end part of the screw hole 2b, and the cylindrical part of the plug 4 has a shape corresponding to the screw relief part 2e, An O-ring packing 10 is attached to an annular groove formed along the circumferential side thereof.
プラグ４の中央部にボルト５が植立され、この
ボルト５にプラグ４の円柱状部と同一の外径から
なる押え板７が遊嵌され、この押え板７上面のボ
ルト５に対し環状のスペーサ６が遊嵌されてい
る。そして、ボルト５にハンドル８が螺着され、
ボルト５の上端部にはハンドル８の操作時、ボル
ト５からハンドル８が離脱するのを防止するため
のストツパ９が固着されている。 A bolt 5 is installed in the center of the plug 4, and a retainer plate 7 having the same outer diameter as the cylindrical portion of the plug 4 is loosely fitted onto the bolt 5. A spacer 6 is loosely fitted. Then, the handle 8 is screwed onto the bolt 5,
A stopper 9 is fixed to the upper end of the bolt 5 to prevent the handle 8 from separating from the bolt 5 when the handle 8 is operated.
このような構成であるので、燃料交換時におい
て、第１図の邪魔になるスタツドボルト３を取除
いたら直ちに、上記プラグをねじ穴２ａに嵌めこ
み、Ｏリングパツキン１０、押え板７、スペーサ
６をはめ込み、ハンドル８を時計方向に回転すれ
ば、プラグ４はねじ穴２ｂの傾斜部２ｅで係止し
ており、ボルト５に遊嵌されたスペーサ６、押え
板７がねじ穴２ｂの内部側に移動し、プラグ４に
形成された環状溝に装着されたＯリングパツキン
１０を圧縮し、Ｏリングパツキン１０がねじ逃げ
部２ｅと環状溝との間に密着して密封を保持す
る。 With this configuration, when changing fuel, immediately after removing the stud bolt 3 that gets in the way as shown in FIG. When the handle 8 is rotated clockwise, the plug 4 is locked at the inclined part 2e of the screw hole 2b, and the spacer 6 and the holding plate 7, which are loosely fitted to the bolt 5, are attached to the inside of the screw hole 2b. , compresses the O-ring packing 10 installed in the annular groove formed in the plug 4, and the O-ring packing 10 comes into close contact between the screw relief portion 2e and the annular groove to maintain a seal.
核燃料交換の原子炉ウエルRWに満水しても、
その水圧、プラグ等の自重、とりわけＯリングパ
ツキン１０により水密は確保され、ねじ穴に水が
入ることはない。 Even if the reactor well RW for nuclear fuel exchange is full of water,
Watertightness is ensured by the water pressure, the weight of the plug, etc., and especially the O-ring packing 10, and water does not enter the screw hole.
ハンドル８を逆時計方向に回せばＯリングパツ
キン１０の圧縮は解除され、防水装置を容易に取
除くことができる。この場合、満水状態時、押え
板７の周側面とねじ逃げ部２ｅとの接触領域は極
めて狭いのでプラグ４及び押え板７の取り外し作
業時、発錆による支障は生じない。 By turning the handle 8 counterclockwise, the compression of the O-ring seal 10 is released and the waterproofing device can be easily removed. In this case, when the water is full, the contact area between the circumferential side of the holding plate 7 and the screw relief portion 2e is extremely narrow, so that no trouble due to rust occurs when removing the plug 4 and the holding plate 7.
第４図は本考案におけるストツパ９の他の例を
示し、このストツパ９はボルト５の上端部に螺着
されており、この場合にもハンドル８の操作時に
おけるハンドル８の離脱が防止される。 FIG. 4 shows another example of the stopper 9 according to the present invention. This stopper 9 is screwed onto the upper end of the bolt 5, and in this case also, the handle 8 is prevented from coming off when the handle 8 is operated. .
（本考案の効果）
本考案によれば、原子炉の定期検査時、特に燃
料交換をする場合、問題となるスタツドボルトを
取除いた後のねじ穴に防水装置を設置した後、満
水、排水するのであるから、放射能雰囲気中にお
ける作業時間は短縮され、かつ、作業は容易であ
り、スタツドボルトの取外し後のねじ穴に水が入
ることなく、水抜き作業や発錆のための錆おとし
清掃作業が省略されることとなり、効果の大なる
ものがある。また、ねじ穴に対する防水装置の取
付け作業時、ねじ穴の有効ねじ部を有効に利用し
て密封できる。(Effects of the present invention) According to the present invention, during periodic inspections of nuclear reactors, especially when changing fuel, a waterproofing device is installed in the screw hole after removing the problematic stud bolt, and then the water is filled with water and drained. As a result, the working time in a radioactive atmosphere is shortened and the work is easy, and water does not enter the screw hole after removing the stud bolt, making it easy to drain water and remove rust. Cleaning work is omitted, which has a great effect. Further, when attaching the waterproofing device to a screw hole, the effective threaded portion of the screw hole can be effectively used to seal the screw hole.
さらに、パツキン部材を圧縮する小さなハンド
ル操作力のみで密封でき、しかもねじ穴の端面に
は、防水装置の部材が当接することなく、ねじ穴
内部で当接するので、フランジシート面が損傷す
ることがない。 Furthermore, the seal can be sealed with only a small handle operation force that compresses the sealing member, and since the waterproof device member does not come into contact with the end face of the screw hole, but comes into contact with it inside the screw hole, the flange sheet surface is not damaged. do not have.
第１図は原子炉核燃料の交換を示す説明図、第
２図は本考案の実施例の断面図、第３図は第２図
のＡ−Ａ矢斜図、第４図は第２図のＢ部拡大断面
図である。
Ｐ……燃料、Ｗ……プール水、FP……燃料プ
ール、RW……原子炉ウエル。１……原子力炉圧
力容器、２……胴体フランジ、２ａ……ねじ穴、
２ｂ……ねじ、２ｃ……ねじ逃げ部、２ｄ……シ
ート面、２ｅ……傾斜部、３……スタツドボル
ト、４……プラグ、５……ボルト、５ａ……ね
じ、６……スペーサ、７……押え板、８……ハン
ドル、９……ストツパ、９ａ……ねじ、１０……
Ｏリングパツキン。
Fig. 1 is an explanatory diagram showing the exchange of reactor nuclear fuel, Fig. 2 is a sectional view of an embodiment of the present invention, Fig. 3 is an A-A arrow diagonal view of Fig. 2, and Fig. 4 is a diagram of Fig. 2. It is an enlarged sectional view of part B. P...Fuel, W...Pool water, FP...Fuel pool, RW...Reactor well. 1... Nuclear reactor pressure vessel, 2... Fuselage flange, 2a... Screw hole,
2b...Screw, 2c...Screw relief part, 2d...Seat surface, 2e...Slanted part, 3...Studded bolt, 4...Plug, 5...Bolt, 5a...Screw, 6...Spacer, 7...Press plate, 8...Handle, 9...Stopper, 9a...Screw, 10...
O-ring packing.
Claims (1)
端にねじ逃げ部とねじ穴傾斜部とを有するスタツ
ドボルト用ねじ穴を防水する胴体フランジねじ穴
防水装置において、 前記ねじ穴傾斜部の傾斜面に接する接触面を有
し、その反対面のねじ逃げ部側の面にパツキング
部材を装着した円周溝を有するプラグと、 該プラグの円周溝に相対して設けられ、前記ね
じ逃げ部の径より小さい円板状の押え板と、 前記プラグの中心部に固定され、前記押え板を
貫通するボルトと、 該ボルトに螺合され、スペーサを介して前記押
え板側に前進して押え板を押圧させるハンドル
と、 を備えたことを特徴とする胴体フランジねじ穴防
水装置。[Scope of Claim for Utility Model Registration] A fuselage flange screw hole waterproofing device for waterproofing a screw hole for a stud bolt formed in a fuselage flange of a reactor pressure vessel and having a screw relief portion and a screw hole slope portion at the upper end, comprising: a plug having a circumferential groove having a contact surface in contact with the inclined surface of the hole inclined portion and having a packing member attached to the surface opposite to the contact surface on the screw relief portion side; and a plug provided opposite to the circumferential groove of the plug. , a disc-shaped holding plate smaller in diameter than the screw relief portion; a bolt fixed to the center of the plug and passing through the holding plate; and a bolt screwed onto the bolt and attached to the holding plate side through a spacer. A fuselage flange screw hole waterproofing device comprising: a handle that moves forward to press a presser plate;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983104598U JPS6012758U (en) | 1983-07-07 | 1983-07-07 | Fuselage flange screw hole waterproof plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983104598U JPS6012758U (en) | 1983-07-07 | 1983-07-07 | Fuselage flange screw hole waterproof plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6012758U JPS6012758U (en) | 1985-01-28 |
| JPH0447489Y2 true JPH0447489Y2 (en) | 1992-11-10 |
Family
ID=30245533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1983104598U Granted JPS6012758U (en) | 1983-07-07 | 1983-07-07 | Fuselage flange screw hole waterproof plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6012758U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54145850A (en) * | 1978-05-04 | 1979-11-14 | Mitsui Eng & Shipbuild Co Ltd | Device for sealing tube |
-
1983
- 1983-07-07 JP JP1983104598U patent/JPS6012758U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54145850A (en) * | 1978-05-04 | 1979-11-14 | Mitsui Eng & Shipbuild Co Ltd | Device for sealing tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6012758U (en) | 1985-01-28 |
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