JPH0648474Y2 - Nuclear pressure vessel flange sheet surface protection device - Google Patents
Nuclear pressure vessel flange sheet surface protection deviceInfo
- Publication number
- JPH0648474Y2 JPH0648474Y2 JP1986128933U JP12893386U JPH0648474Y2 JP H0648474 Y2 JPH0648474 Y2 JP H0648474Y2 JP 1986128933 U JP1986128933 U JP 1986128933U JP 12893386 U JP12893386 U JP 12893386U JP H0648474 Y2 JPH0648474 Y2 JP H0648474Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure vessel
- flange
- sheet surface
- nuclear pressure
- protection device
- 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 - Lifetime
Links
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
Description
【考案の詳細な説明】 〈産業上の利用分野〉 この考案は原子力圧力容器の定期検査に際し、該容器の
フランジシート面の損傷を防止するシート面保護装置の
構造に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a structure of a seat surface protection device for preventing damage to a flange seat surface of a nuclear pressure vessel at the time of periodic inspection.
〈従来の技術及びその問題点〉 原子力圧力容器の定期検査（以下単に定検と称す）に際
しては原子力圧力容器（第８図上蓋１及び胴体２よりな
る。）の上蓋１を締付けているスタツドボルト４のナツ
トを開放し、放射性物質に対する安全上から第７図に示
すウエル（貯水槽）RW内に水を満し圧力容器内の収容物
たるLP（検出器集合体LPRM）及び第５図、第６図に示す
制御棒（CR）等の入れ替えをする。このスタツドボルト
は一例では径が150mm長さ1800mm重量250kgもありかつそ
の数も多くその取扱いは慎重にせねばならない。また定
検に際してスタツドボルトを清掃のため抜き取りしたあ
とのボルト孔を塞いでおかないと、ウエルRWの水により
ねじ部に錆を生じ組立に際しねじの噛り焼付損傷の問題
を生ずる。このためねじ穴3bは第12図に示すプラグ５で
蓋をし、水密にするためＯリングパツキン14を押え板７
で押圧している。<Prior Art and Problems Thereof> A stud bolt for fastening the upper lid 1 of the nuclear pressure vessel (comprising the upper lid 1 and the body 2 in FIG. 8) at the time of periodical inspection of the nuclear pressure vessel (hereinafter simply referred to as regular inspection). From the safety of radioactive materials, open the nut of No. 4 and fill the well (reservoir) RW shown in Fig. 7 with water and store LP (detector assembly LPRM) in the pressure vessel and Fig. 5, Replace the control rod (CR) etc. shown in Fig. 6. As an example, this stud bolt has a diameter of 150 mm, a length of 1800 mm, and a weight of 250 kg, and since there are many such bolts, it must be handled carefully. If the stud bolt is removed for cleaning during regular inspection, the bolt hole must be closed so that the water in the well RW rusts the threaded portion, causing a problem of seizure damage to the screw during assembly. For this reason, the screw hole 3b is covered with the plug 5 shown in FIG. 12, and the O-ring packing 14 is pressed against the pressing plate 7 to make it watertight.
Pressing with.
またフランジシート面3aの保護のためには第10図、第11
図に示す圧力容器のフランジ内径と同径環状のシート面
保護装置（CV）をシート面に載置し、これを固定具（ス
タツドCV3、ナツトCV2、締付金具CV1よりなる）CVFで固
定していた。Also, in order to protect the flange sheet surface 3a, as shown in FIGS.
Place a seat surface protection device (CV), which has the same diameter as the flange inner diameter of the pressure vessel shown in the figure, on the seat surface, and mount it on a fixture (consisting of a stud CV 3 , a nut CV 2 , and a tightening metal CV 1 ) CVF It was fixed at.
前記交換を要する検出器集合体（以下LPRMと称す）LP
は、圧力容器の深さに対応する長さをもち、図示の如く
ウエルRWに連通する燃料プールFPに斜めにして引きずり
込むような形にして移動させている（第７図）。このた
めフランジシート面に保護手段がないときは前記部材LP
でシート面に損傷を生ずることとなり補修については材
質及び放射線の点より相当の期間、費用、困難を生じて
いたのである。Detector assembly requiring replacement (hereinafter referred to as LPRM) LP
Has a length corresponding to the depth of the pressure vessel, and is moved so as to be obliquely dragged into the fuel pool FP communicating with the well RW as shown in FIG. 7 (FIG. 7). Therefore, if there is no protective means on the surface of the flange sheet,
As a result, the seat surface was damaged, and repairs had a considerable period of time, cost, and difficulty in terms of materials and radiation.
また第10図、第11図に示す従来の保護装置では、圧力軸
心方向（第７図で下から上方向）への力を受けるときは
外れやすいという問題がある。また、第11図に示すよう
に板状体のシート面保護装置CVとフランジシート面3bの
間にはウエル水が侵入し、加えて両部材間の材質による
電位差等の問題があり孔食腐食を生じ両部材が密着面を
持つことは望ましくないことが判つた。Further, the conventional protective device shown in FIGS. 10 and 11 has a problem that it is easily disengaged when receiving a force in the direction of the pressure axis (from the bottom to the top in FIG. 7). Further, as shown in FIG. 11, well water penetrates between the sheet surface protection device CV of the plate-like body and the flange sheet surface 3b, and there is a problem such as a potential difference due to the material between the two members, which causes pitting corrosion. It was found that it is not desirable that both members have a contact surface.
〈考案の目的〉 この考案はこのような問題を解決するもので、圧力容器
フランジから外れることなく、かつそのシート面に密着
する板体を有することなく、かつ、スタツドボルトのね
じ孔を密閉し、定検後の組立を円滑にする原子力圧力容
器フランジシート面保護装置の構造を提案することを目
的とする。<Purpose of the Invention> The present invention solves such a problem by sealing the screw hole of the stud bolt without disengaging from the pressure vessel flange and without having a plate body that closely adheres to the seat surface. , The purpose of the invention is to propose a structure of a flange sheet surface protection device for a nuclear pressure vessel that facilitates assembly after regular inspection.
〈手段の概要〉 要するにこの考案は、原子力圧力容器のフランジシート
面を定検に際し移動する部材の擦過等から保護するもの
において、フランジシート面とこれを保護するシート面
カバーとの間の隙間を限定する厚みの押え板を該シート
面カバー下面に接続し、その接続位置はフランジボルト
孔用プラグのＯリングを押出する位置とし、かつ該シー
ト面カバーは前記プラグに立設したスタツドに螺合する
締付具により前記原子力圧力容器のフランジに固定され
た原子力圧力容器フランジシート面保護装置の構造を開
示するものである。<Summary of Means> In summary, the present invention protects the flange sheet surface of a nuclear pressure vessel from scratches and the like of moving members during regular inspections, and provides a gap between the flange sheet surface and the sheet surface cover that protects it. A pressing plate having a limited thickness is connected to the lower surface of the seat surface cover, and the connecting position is a position for pushing out the O-ring of the flange bolt hole plug, and the seat surface cover is screwed to a stud installed upright on the plug. The structure of a nuclear pressure vessel flange sheet surface protection device fixed to the flange of the nuclear pressure vessel by a fastener is disclosed.
〈実施例〉 原子力圧力容器の内部構造物の交換についき第５図〜第
９図により説明する。<Example> The internal structure of a nuclear pressure vessel will be replaced with reference to FIGS. 5 to 9.
原子炉は、第７図に示すように通常１年に１回定期検査
のため運転を停止される。この定期検査中に一部の検出
器集合体（以降はLPRMと略記する）−LPは、新LPRM−LP
と交換されるが、使用済みLPRM−LPは、強い放射性を持
つているため放射線をしやへいする必要があり、原子力
圧力容器の上蓋１（第８図参照）を外し、原子炉ウエル
−RWにプール水−Ｗを満した状態で、原子力圧力容器よ
り燃料プール−FPへの使用済LPRM−LPの移動（径路イ）
を行なう、なお新LPRM−LPは原子炉ウエル−RW上方より
装填（径路ロ）を行なう。（第６図にLPRM−LPおよび制
御棒−CRとの配置関係を示す） 使用済LPRM−LPの移動の際、胴体フランジ‐３に植え込
まれたスタツドボルト‐４は、上蓋１（第８図参照）取
外し後、胴体フランジ‐３と共に水没する。また、使用
済LPRM−LPを移動する際、スタツドボルト−４が邪魔と
なるため数本のスタツドボルト−４取外し後のねじ穴36
も水没する。（第５図参照）このねじ穴36は水没によつ
て発生する錆は、ねじのかじりおよび強度不足の原因と
なり好ましくない。このためこの考案の提案するプラグ
５でねじ穴3bを密封する。As shown in Fig. 7, the reactor is normally shut down once a year for regular inspection. During this periodic inspection, some detector assemblies (hereinafter abbreviated as LPRM) -LP are new LPRM-LP.
However, since the used LPRM-LP has strong radioactivity, it is necessary to reduce the radiation so that the upper lid 1 (see Fig. 8) of the nuclear pressure vessel is removed and the reactor well-RW is removed. The spent LPRM-LP from the nuclear pressure vessel to the fuel pool-FP in a state where the pool water-W is full (path A)
The new LPRM-LP is loaded (path B) from above the reactor well-RW. (Fig. 6 shows the positional relationship between LPRM-LP and control rod-CR) When the used LPRM-LP is moved, the stud bolt-4 implanted in the body flange-3 is attached to the upper lid 1 (8th (See figure) After removal, submerge with body flange-3. Also, when moving the used LPRM-LP, the stud bolt-4 interferes, so several stud bolts-4 screw holes after removal 36
Is also submerged. (See FIG. 5) The rust generated in the screw hole 36 due to submersion in water is not preferable because it causes galling of the screw and insufficient strength. Therefore, the screw hole 3b is sealed with the plug 5 proposed by the present invention.
第１図に本考案の実施にかかる装置の部分斜視図を示
す。第７図で示した使用済LPRM−LPは、胴体フランジ３
シート面3a上に接触することから、また原子炉ウエル−
RWより燃料プールFPへの通路は、第５図に示す如く狭
い、これらに対しシート面カバー８は、胴体フランジ３
の内面に沿つた曲げを設け、使用済LPRM−LPの移動位置
決めと、燃料プールFPへの移動を容易にするガイドプレ
ート９を設けた。FIG. 1 is a partial perspective view of an apparatus according to the present invention. The used LPRM-LP shown in FIG.
Since it comes into contact with the seat surface 3a, the reactor well-
The passage from the RW to the fuel pool FP is narrow as shown in FIG. 5, whereas the seat surface cover 8 has the body flange 3
A guide plate 9 is provided for facilitating the movement positioning of the used LPRM-LP and the movement to the fuel pool FP by providing a bend along the inner surface of the.
第２図は本考案の一実施例の平面図を示す。この考案の
シート面保護具は、２つのプラグ５で固定する構造で、
シート面カバー８の幅は、スタツドボルト４の４本分程
度とした。FIG. 2 shows a plan view of an embodiment of the present invention. The seat surface protector of this invention has a structure in which it is fixed with two plugs 5,
The seat surface cover 8 has a width of about four stud bolts 4.
このシート面保護具の取扱作業を容易にするため取手10
を設けた構造とした。Handle 10 to facilitate handling of this sheet surface protector.
Is provided.
第３図は第２図の断面AAを示す。第３図のＢ群詳細は第
４図に示す。FIG. 3 shows the section AA of FIG. Details of group B in FIG. 3 are shown in FIG.
プラグ５の上端部にＯリングパツキン14の溝を設け、ね
じ逃げ部3cの隙間はわずかとして、第３図左側から使用
済LPRM−LPが当つた時のストツパの役目を持たせた。ね
じ逃げ部3cの傾斜面にプラグ５も接触させる事により、
使用済LPRM−LPが、シート面カバー８の上に乗つた時の
重量に対してもシート面カバー８が動かないように固定
するものである。傾斜部下のねじ3dにプラグ５のねじを
ねじ込むことにより、ねじ部に働らく力は上方向へ引張
力だけで、ねじ部の変形は起きないことが云える。A groove for the O-ring packing 14 is provided at the upper end of the plug 5, and the clearance of the screw escape portion 3c is made small so as to serve as a stopper when the used LPRM-LP hits from the left side in FIG. By bringing the plug 5 into contact with the inclined surface of the screw relief portion 3c,
The used LPRM-LP fixes the seat surface cover 8 so that the seat surface cover 8 does not move even with respect to the weight when the seat surface cover 8 is placed on the seat surface cover 8. It can be said that by screwing the screw of the plug 5 into the screw 3d below the inclined portion, the force acting on the screw portion is only the upward pulling force, and the deformation of the screw portion does not occur.
このシート面保護の取付は、 （１）プラグ５を胴体フランジ３のねじ3dにねじ込むい
は、中央部ボルト−６の上端部ハンドル−12より上部に
レンチまたはスパナでボルト−６をはさみ、プラグの傾
斜部がねじ逃げ部3c傾斜部に接触するまでプラグ５のね
じを胴体フランジ３のねじ3dにねじこむ。This seat surface protection is attached by (1) screwing the plug 5 into the screw 3d of the body flange 3 or inserting the bolt 6 with a wrench or spanner above the upper end handle -12 of the central bolt 6 The screw of the plug 5 is screwed into the screw 3d of the body flange 3 until the slanted part of 3 comes into contact with the slanted part of the screw relief part 3c.
（２）ハンドル12を回転させスペーサー11を介しシート
面カバー８と押え板７を押し下げる、この押し下げによ
りプラグ５の上端溝のＯリングパツキン14は、ねじ逃げ
部3cに圧縮され密着する、また押え板７がプラグ５の上
面と接触する。この確認のためにフランジ上面3eと押え
板７が密着し、取付完了となる。またこれにより目的と
するシート面カバー８とシート面3aは密着することなく
隙間ｅは保たれ孔食腐食をおこすことはない。(2) The handle 12 is rotated to push down the seat surface cover 8 and the pressing plate 7 through the spacer 11. By this pushing down, the O-ring packing 14 in the upper groove of the plug 5 is compressed and closely adheres to the screw escape portion 3c. The plate 7 contacts the upper surface of the plug 5. For this confirmation, the flange upper surface 3e and the pressing plate 7 are brought into close contact with each other, and the mounting is completed. Further, as a result, the intended seat surface cover 8 and the seat surface 3a do not come into close contact with each other, the gap e is maintained, and pitting corrosion does not occur.
また、シート面カバー８は、ボルト７、スペーサー11、
押え板７とハンドル12でねじ穴3bに螺合するプラグ５で
固持されるので、圧力容器フランジから外れることはな
い。Also, the seat surface cover 8 includes the bolt 7, the spacer 11,
The pressing plate 7 and the handle 12 are fixed by the plug 5 that is screwed into the screw hole 3b, so that the pressing plate 7 and the handle 12 will not come off the pressure vessel flange.
〈効果〉 従来技術のシート面保護装置では、シート面とシート面
保護装置間に隙間がないため孔食腐食を起す問題があつ
たが、シート面カバーに防水プラグ押え板を接続し適切
な隙間ｅを保持するのでシート面の孔食腐食による補
修、傷の除去等の問題がなくなり胴体フランジシート面
の健全性も大幅に向上されるものである。また、ガイド
プレートを有するシート面カバーを設けた事により使用
済LPRMの移動に当り、胴体フランジシート面の保護と使
用済LPRMの移動の際には炉心頂部に示すよう原子力圧力
容器より離れた位置にあるもの等に対しては、位置決
め、移動作業等の上程短縮が可能となる。<Effect> With the seat surface protection device of the prior art, there is a problem that pitting corrosion occurs because there is no gap between the seat surface and the seat surface protection device. Since e is held, the problems such as repair and scratch removal of the seat surface due to pitting corrosion are eliminated, and the soundness of the fuselage flange seat surface is greatly improved. In addition, when a used LPRM is moved by providing a seat surface cover with a guide plate, the fuselage flange seat surface is protected and the used LPRM is moved away from the nuclear pressure vessel as shown at the top of the core when moving the LPRM. It is possible to shorten the process of positioning, moving, etc.
使用済LPRM移動作業が容易にされ作業時間の短縮される
ことができ、かつ放射線雰囲気線量の増加を抑えること
が可能であり被曝の点でも大幅に改善されるものであ
る。The used LPRM transfer work can be facilitated, the work time can be shortened, the increase in radiation atmosphere dose can be suppressed, and the radiation dose can be greatly improved.
以上の改善効果により使用済LPRM−LP移動作業は容易と
なり、また胴体フランジシート面の検査工数低減および
上程短縮が従来の30％以下になるという効果を奏する。Due to the above improvement effects, the used LPRM-LP movement work becomes easy, and the number of man-hours for inspection of the flange surface of the fuselage and the shortening of the process are reduced to 30% or less of the conventional level.
第１図はこの考案の実施の一例を示す装置の斜視図、第
２図は第１図の平面図、第３図は第２図のＡ−Ａ断面
図、第４図は第３図のＢ部拡大詳細図、第５図は第７図
の平面図で原子炉ウエルと燃料プールの関係を示す図
面、第６図は第５図のＣ部詳細図、第７図はLPRM移動中
の原子炉廻りの構造を示す縦断面図、第８図は原子力圧
力容器の閉止した状態を示す部分断面図、第９図は第８
図のＤ部詳細図、第10図は従来技術のシート面保護装置
の平面図、第11図は第10図のＥ−Ｅ断面図、第12図は従
来技術のねじ穴防水プラグの断面図である。 １…上蓋 ２…圧力容器胴体 ３…胴体フランジ CV…シート面保護装置 3a…フランジシート面 ５…プラグ ９…ガイドプレート1 is a perspective view of an apparatus showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is of FIG. FIG. 5 is an enlarged detailed view of part B, FIG. 5 is a plan view of FIG. 7, showing the relationship between the reactor well and the fuel pool, FIG. 6 is a detailed view of part C of FIG. 5, and FIG. FIG. 8 is a vertical cross-sectional view showing the structure around the reactor, FIG. 8 is a partial cross-sectional view showing the closed state of the nuclear pressure vessel, and FIG.
FIG. 10 is a detailed view of a portion D of the drawing, FIG. 10 is a plan view of a seat surface protection device of the related art, FIG. 11 is a sectional view taken along line EE of FIG. 10, and FIG. Is. 1 ... Top lid 2 ... Pressure vessel body 3 ... Body flange CV ... Seat surface protection device 3a ... Flange seat surface 5 ... Plug 9 ... Guide plate
Claims (2)
に際し移動する部材の擦過等から保護するものにおい
て、フランジシート面とこれを保護するシート面カバー
との間の隙間を限定する厚みの押え板を該シート面カバ
ー下面に接続し、その接続位置はフランジボルト孔用プ
ラグのＯリングを押出する位置とし、かつ該シート面カ
バーは押圧する位置とし、かつ該シート面カバーは前記
プラグに立設したスタツドに螺合する締付具により前記
原子力圧力容器のフランジに固定させることを特徴とす
る原子力圧力容器フランジシート面保護装置。1. A presser having a thickness for limiting a gap between a flange sheet surface and a sheet surface cover for protecting the flange sheet surface of a nuclear pressure vessel against rubbing of a moving member during regular inspection. The plate is connected to the lower surface of the seat face cover, the connecting position is a position to push out the O-ring of the flange bolt hole plug, the seat face cover is a pressing position, and the seat face cover is erected on the plug. A nuclear pressure vessel flange sheet surface protection device, characterized in that it is fixed to the flange of the nuclear pressure vessel by a fastening tool that is screwed into an established stud.
力圧力容器フランジシート面保護装置において、シート
面カバーの上面にガイドプレートを立設したもの。2. The nuclear pressure vessel flange seat surface protection device according to claim 1 of the utility model registration, wherein a guide plate is provided upright on the top surface of the seat surface cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986128933U JPH0648474Y2 (en) | 1986-08-26 | 1986-08-26 | Nuclear pressure vessel flange sheet surface protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986128933U JPH0648474Y2 (en) | 1986-08-26 | 1986-08-26 | Nuclear pressure vessel flange sheet surface protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6335998U JPS6335998U (en) | 1988-03-08 |
| JPH0648474Y2 true JPH0648474Y2 (en) | 1994-12-12 |
Family
ID=31025054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986128933U Expired - Lifetime JPH0648474Y2 (en) | 1986-08-26 | 1986-08-26 | Nuclear pressure vessel flange sheet surface protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0648474Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8932428B2 (en) | 2005-04-15 | 2015-01-13 | Seda S.P.A. | Insulated container, method of fabricating same and apparatus for fabricating |
-
1986
- 1986-08-26 JP JP1986128933U patent/JPH0648474Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8932428B2 (en) | 2005-04-15 | 2015-01-13 | Seda S.P.A. | Insulated container, method of fabricating same and apparatus for fabricating |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6335998U (en) | 1988-03-08 |
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