JPS6334438B2 - - Google Patents
Info
- Publication number
- JPS6334438B2 JPS6334438B2 JP57221883A JP22188382A JPS6334438B2 JP S6334438 B2 JPS6334438 B2 JP S6334438B2 JP 57221883 A JP57221883 A JP 57221883A JP 22188382 A JP22188382 A JP 22188382A JP S6334438 B2 JPS6334438 B2 JP S6334438B2
- Authority
- JP
- Japan
- Prior art keywords
- protective cover
- flange
- pressure vessel
- waterproof
- fuselage
- 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
- 230000001681 protective effect Effects 0.000 claims description 31
- 238000007689 inspection Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004078 waterproofing Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004904 shortening 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
- Pressure Vessels And Lids Thereof (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は原子炉圧力容器に係り、特にその胴体
フランジ部のスタツドボルトおよびねじ穴の防水
保護カバーに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a nuclear reactor pressure vessel, and particularly to a waterproof protective cover for stud bolts and screw holes in a fuselage flange portion thereof.
第１，２図は原子炉圧力容器の周辺を示すそれ
ぞれ平面図、正面図であり、第３図はその胴体フ
ランジ部のスタツドボルトおよびねじ穴の従来の
防水保護カバーを示す縦断面図である。
Figures 1 and 2 are a plan view and a front view, respectively, showing the vicinity of the reactor pressure vessel, and Figure 3 is a longitudinal sectional view showing a conventional waterproof protective cover for stud bolts and screw holes in the fuselage flange. .
原子力プラントの定期検査において、原子炉圧
力容器１の胴体フランジ部２は、燃料交換のため
原子ウエル３および燃料貯蔵プール４に水張りす
るため冠水状態になる。 During a periodic inspection of a nuclear power plant, the fuselage flange portion 2 of the reactor pressure vessel 1 becomes flooded because the atomic well 3 and fuel storage pool 4 are filled with water for fuel exchange.
このとき前記胴体フランジ部２のスタツドボル
ト５および供用期間中検査のため取外されたスタ
ツドボルトの胴体フランジねじ穴６は、炉水への
油脂分の混入が禁じられているため表面が清浄な
状態で水没されるので、錆の発生がさけられな
い。最近の公知例では、前記スタツドボルト５に
１本すつ防水キヤツプ７を被冠させ、前記ねじ穴
６には第４図に示す如く防水プラグ８を螺設し
て、燃料交換のための水張りにより水没しないよ
うにする方法が提案されている。この場合防錆効
果および錆除去のための時間の短縮効果はある
が、前記防水キヤツプ７が直径約200φ、高さ約
600mmと大きいため、取付け、取外し作業に特別
な作業台が必要となる。また前記防水キヤツプ７
を１本ずつ取付け、取外しをするため時間がかゝ
り、定検時間の短縮、放射能被曝低減が図れない
欠点があつた。 At this time, the stud bolts 5 of the fuselage flange portion 2 and the fuselage flange threaded holes 6 of the stud bolts that were removed for inspection during the service period have a clean surface because it is prohibited to mix oils and fats into the reactor water. Since it is submerged in water, rust cannot be avoided. In a recent known example, the stud bolt 5 is covered with a single waterproof cap 7, and a waterproof plug 8 is screwed into the screw hole 6 as shown in FIG. 4 to fill water for fuel exchange. A method has been proposed to prevent water from submerging. In this case, although there is a rust prevention effect and a rust removal time reduction effect, the waterproof cap 7 has a diameter of approximately 200φ and a height of approximately
Due to its large size of 600mm, a special workbench is required for installation and removal work. In addition, the waterproof cap 7
It takes time to install and remove the tubes one by one, which has the drawback that it is not possible to shorten regular inspection time or reduce radiation exposure.
本発明は上記事実に鑑みてなされたものであ
り、スタツドボルトおよび胴体フランジねじ穴の
防水作業を短時間に行える防水保護カバーを提供
するものである。
The present invention has been made in view of the above facts, and provides a waterproof protective cover that can perform waterproofing work on stud bolts and body flange screw holes in a short time.
本発明の構成要件は胴体フランジ上面にスタツ
ドボルトを組み込むねじ穴が環状の配置で多数個
備えている原子炉圧力容器において、前記環状の
外側で前記胴体フランジ上面に立設される筒状の
外周壁と、前記環状の内側で前記胴体フランジ上
面に立設される筒状の内周壁と、前記内外周両壁
で囲われた空間の上方を塞ぐ環状の上部壁と、前
記スタツドボルトの上端に螺合される保護カバー
キヤツプのねじ部が通過できて前記保護カバーキ
ヤツプのフランジ部で囲いかぶされる大きさにて
前記上部壁面に前記ねじ穴の数よりも少ない数だ
け開口され穴とから成る原子炉圧力容器のスタツ
ドボルトの防水保護カバーであつて、その防水保
護カバーをスタツドボルトとねじ穴とをおおいか
ぶせるようにフランジ上に置いて、次に上部壁面
の穴から通した保護カバーキヤツプをスタツドボ
ルトに螺合して防水保護カバーを原子炉圧力容器
に固定するものである。
The constituent elements of the present invention are a nuclear reactor pressure vessel having a plurality of screw holes arranged in an annular arrangement on the upper surface of a fuselage flange for inserting stud bolts, and a cylindrical outer periphery provided upright on the upper surface of the fuselage flange on the outside of the annular shape. a wall, a cylindrical inner circumferential wall standing upright on the upper surface of the fuselage flange inside the annular shape, an annular upper wall that closes the upper part of the space surrounded by the inner and outer circumferential walls, and an upper end of the stud bolt. a hole opened in the upper wall surface in a number smaller than the number of screw holes, the size of which allows the threaded portion of the protective cover cap to be screwed to pass through and is covered by the flange portion of the protective cover cap; A waterproof protective cover for stud bolts in a reactor pressure vessel, the waterproof protective cover is placed on the flange so as to cover the stud bolt and the screw hole, and then the protective cover cap is passed through the hole in the upper wall surface. This screw is screwed onto the stud bolt to secure the waterproof protective cover to the reactor pressure vessel.
以下本発明に係る原子力圧力容器のスタツドボ
ルトの防水保護カバーの実施例を図面を参照して
説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a waterproof protective cover for stud bolts of a nuclear pressure vessel according to the present invention will be described with reference to the drawings.
第５図から第８図にかけて示した防水保護カバ
ー９は、フランジ２上面に立設される円筒状の外
周壁９ａと、それよりも小径な円筒状の内周壁９
ｂと、両内外壁９ａ，９ｂで囲われる空間の上方
を塞ぐ上部壁９ｃとを壁として備えている。上部
壁９ｃには、ねじ孔６の真上の位置に相当する各
部位であつて、ところどころ穴９ｄが開口されて
いる。この穴９ｄの大きさは保護カバーキヤツプ
１２のねじ部１２ａが通れて、且つキヤツプフラ
ンジ部１２ｂが通れない大きさの直径とされる。
そして、その穴９ｄにはねじ部１２ａが通されて
ねじ部１２ａがスタツドボルト５の上端のねじ穴
と螺合している。この為に防水保護カバー９はフ
ランジ２上面へねじ孔６を囲うように固設され
る。 The waterproof protective cover 9 shown in FIGS. 5 to 8 includes a cylindrical outer circumferential wall 9a standing upright on the upper surface of the flange 2, and a cylindrical inner circumferential wall 9 with a smaller diameter.
b, and an upper wall 9c that closes the upper part of the space surrounded by both the inner and outer walls 9a and 9b. Holes 9d are opened here and there in the upper wall 9c at positions corresponding to positions directly above the screw holes 6. The diameter of the hole 9d is large enough to allow the threaded portion 12a of the protective cover cap 12 to pass through, but not to allow the cap flange portion 12b to pass through.
A threaded portion 12a is passed through the hole 9d, and the threaded portion 12a is screwed into a threaded hole at the upper end of the stud bolt 5. For this purpose, a waterproof protective cover 9 is fixed to the upper surface of the flange 2 so as to surround the screw hole 6.
このような防水保護カバー９は二重円筒状に形
成されており、原子炉圧力容器胴体フランジ２の
上部面上においてスタツドボルト５および胴体フ
ランジねじ穴６を囲むように固設されている。こ
のように一体化された前記防水保護カバー９と前
記フランジ２との当接部にはパツキン１０が配設
されており、この防水保護カバー９は前記スタツ
ドボルト５の頂部に形成されたねじ穴１１に保護
カバーキヤツプ１２を介して数ケ所において螺設
締結されて、前記パツキン１０を圧縮して水密に
シールされている。また前記保護カバーキヤツプ
１２と前記防水保護カバー９との当接部にはＯリ
ング１３が嵌合されており、保護カバーキヤツプ
１２で締めつけることにより前記Ｏリング１３が
圧縮されて水密にシールされるようになつてい
る。また前記保護カバー９にはその直径上を放射
状に数本のサポートアングル１４が固設されてお
り、この保護カバー９を補強すると同時に原子炉
建屋クレーン等で吊り上げたときの強度をもたせ
てある。 The waterproof protective cover 9 is formed into a double cylindrical shape and is fixed on the upper surface of the reactor pressure vessel fuselage flange 2 so as to surround the stud bolts 5 and the fuselage flange screw holes 6. A gasket 10 is disposed at the contact portion between the waterproof protective cover 9 and the flange 2 that are integrated in this way, and this waterproof protective cover 9 is fitted with a screw hole formed at the top of the stud bolt 5. 11 through protective cover caps 12 at several locations, and the packing 10 is compressed to form a watertight seal. Further, an O-ring 13 is fitted into the abutting portion between the protective cover cap 12 and the waterproof protective cover 9, and when the protective cover cap 12 is tightened, the O-ring 13 is compressed and sealed watertightly. It's becoming like that. In addition, several support angles 14 are fixed to the protective cover 9 in a radial manner on its diameter to reinforce the protective cover 9 and at the same time give it strength when lifted by a reactor building crane or the like.
本発明の実施例による防水保護カバーによれ
ば、その取付け、取外しが容易になり、作業時間
の短縮がはかられる。最近の公知例によるスタツ
ドボルト毎に防水キヤツプを被冠する方法におい
ても、従来の錆除去作業を行つていた時の作業時
間約12時間に対し約８時間に短縮ができるとして
いるが、本発明の実施例に示す方法によれば更に
約４時間の短縮ができる。また定検時間および放
射能低減が従来の1/3、最近の公知例の1/2に短縮
低減ができる。また本実施例では防水保護カバー
は完全に一体化された形状について説明したが、
数分割してもよいが作業時間の面で本実施例の方
が有利であることは云うまでもない。 According to the waterproof protective cover according to the embodiment of the present invention, it is easy to attach and detach the cover, and the working time can be shortened. It is also claimed that a recently known method of covering each stud bolt with a waterproof cap can reduce the work time to about 8 hours, compared to about 12 hours when doing conventional rust removal work. According to the method shown in the embodiment of the invention, the time can be further shortened by about 4 hours. In addition, regular inspection time and radioactivity reduction can be reduced to 1/3 of conventional methods and 1/2 of recent known examples. In addition, in this example, the waterproof protective cover is completely integrated.
Although it may be divided into several parts, it goes without saying that this embodiment is more advantageous in terms of working time.
本発明は原子炉圧力容器のスタツドボルトの防
水保護カバーにおいて、この圧力容器胴体フラン
ジ部のスタツドボルトおよびねじ穴を一体化され
た防水保護カバーで被覆するようにしたので、防
水作業が極めて短時間になり、定検時間の短縮お
よび放射能被曝の低減が可能となつた効果は極め
て大である。
The present invention provides a waterproof protective cover for the stud bolts of a reactor pressure vessel, in which the stud bolts and screw holes in the pressure vessel body flange are covered with an integrated waterproof protective cover, so that waterproofing work can be completed in an extremely short time. The effect of shortening regular inspection time and reducing radiation exposure is extremely large.
第１図は原子炉燃料プール周辺の配置を示す平
面図、第２図は第１図の正面図、第３図は最近の
公知例の防水キヤツプの取付状態を示す縦断面
図、第４図は最近の公知例の防水プラグの取付状
態を示す縦断面図、第５図は本発明に係る防水保
護カバーの実施例を示す取付平面図、第６図は第
５図のＡ−Ａ断面図、第７図は第５図のＢ−Ｂ断
面図、第８図は第５図のＣ−Ｃ断面図である。
１……原子炉圧力容器、２……胴体フランジ
部、５……スタツドボルト、６……胴体フランジ
ねじ孔、７……防水キヤツプ、８……防水プラ
グ、９……防水保護カバー、１２……保護カバー
キヤツプ、１４……サポートアングル。
Fig. 1 is a plan view showing the arrangement around the reactor fuel pool, Fig. 2 is a front view of Fig. 1, Fig. 3 is a longitudinal sectional view showing the installation state of a recently known waterproof cap, and Fig. 4 5 is a longitudinal cross-sectional view showing an installed state of a waterproof plug according to a recent known example, FIG. 5 is an installation plan view showing an embodiment of a waterproof protective cover according to the present invention, and FIG. 6 is a cross-sectional view taken along line A-A in FIG. , FIG. 7 is a sectional view taken along line BB in FIG. 5, and FIG. 8 is a sectional view taken along line CC in FIG. DESCRIPTION OF SYMBOLS 1... Reactor pressure vessel, 2... Fuselage flange portion, 5... Stud bolt, 6... Fuselage flange screw hole, 7... Waterproof cap, 8... Waterproof plug, 9... Waterproof protective cover, 12... ...Protective cover cap, 14...Support angle.
Claims (1)
むねじ穴が環状の配置で多数個備えている原子炉
圧力容器において、前記環状の外側で前記胴体フ
ランジ上面に立設される筒状の外周壁と、前記環
状の内側で前記胴体フランジ上面に立設される筒
状の内周壁と、前記内外周両壁で囲われた空間の
上方を塞ぐ環状の上部壁と、前記スタツドボルト
の上端に螺合される保護カバーキヤツプのねじ部
が通過できて前記保護カバーキヤツプのフランジ
部で囲いかぶされる大きさにて前記上部壁面に前
記ねじ穴の数よりも少ない数だけ開口された穴と
から成る原子炉圧力容器のスタツドボルトの防水
保護カバー。1. In a reactor pressure vessel having a plurality of screw holes arranged in an annular arrangement on the upper surface of the fuselage flange into which stud bolts are inserted, a cylindrical outer circumferential wall standing upright on the upper surface of the fuselage flange on the outside of the annular shape; a cylindrical inner circumferential wall that stands upright on the upper surface of the fuselage flange inside the body; an annular upper wall that closes the upper part of the space surrounded by the inner and outer circumferential walls; and a protection screwed onto the upper end of the stud bolt. a nuclear reactor pressure vessel comprising a hole opened in the upper wall surface in a number smaller than the number of screw holes of a size that allows the threaded part of the cover cap to pass through and is covered by the flange part of the protective cover cap. waterproof protective cover for stud bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57221883A JPS59112286A (en) | 1982-12-20 | 1982-12-20 | Water-proof protection cover of stud bolt of reactor pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57221883A JPS59112286A (en) | 1982-12-20 | 1982-12-20 | Water-proof protection cover of stud bolt of reactor pressure vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59112286A JPS59112286A (en) | 1984-06-28 |
| JPS6334438B2 true JPS6334438B2 (en) | 1988-07-11 |
Family
ID=16773669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57221883A Granted JPS59112286A (en) | 1982-12-20 | 1982-12-20 | Water-proof protection cover of stud bolt of reactor pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59112286A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6654436B2 (en) * | 2001-10-08 | 2003-11-25 | Westinghouse Electric Company Llc | Stud enclosure and method of use |
-
1982
- 1982-12-20 JP JP57221883A patent/JPS59112286A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59112286A (en) | 1984-06-28 |
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