JPH023197Y2 - - Google Patents
Info
- Publication number
- JPH023197Y2 JPH023197Y2 JP1984036071U JP3607184U JPH023197Y2 JP H023197 Y2 JPH023197 Y2 JP H023197Y2 JP 1984036071 U JP1984036071 U JP 1984036071U JP 3607184 U JP3607184 U JP 3607184U JP H023197 Y2 JPH023197 Y2 JP H023197Y2
- Authority
- JP
- Japan
- Prior art keywords
- pin
- ratchet
- bolt
- outer pipe
- piece
- 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
- 239000000446 fuel Substances 0.000 claims description 16
- 210000000078 claw Anatomy 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 description 9
- 230000000712 assembly Effects 0.000 description 8
- 238000000429 assembly Methods 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Description
【考案の詳細な説明】
この考案は核燃料集合体を炉心中において所定
の間隔配置に保持するためのばね組立体を集合体
の保守点検に当たつて安全、確実に取外すことが
できるようにした取外し装置に関する。[Detailed description of the invention] This invention enables the spring assemblies that hold the nuclear fuel assemblies at predetermined spacing in the reactor core to be safely and reliably removed for maintenance and inspection of the assemblies. Relating to a removal device.
一般に沸騰水型の原子炉では、炉心において並
列する多数の燃料集合体を、４体のものが一組と
なつて単位格子内に位置するように格子状枠体に
支持しており、そして、集合体相互の間に下側か
ら制御棒を出し入れできると共に各集合体を弾性
的に支持するために、上記枠体の単位格子の中央
部に位置することになる各燃料集合体のコーナ部
には、特公昭44−9556号の発明により広く知られ
ているように直交する二つの垂直面に沿つて垂下
する二股状の板ばねと縦向きアングル状の保護部
材とからなるばね組立体を配設し、それらの水平
頭部を燃料集合体のチヤンネルボツクス上端のコ
ーナ板上に載置し、その上方からボルトを差し込
み上部タイプレートのコーナ柱にねじ込んでばね
組立体を定着し、対向する燃料集合体の板ばね同
志を圧接させて、燃料集合体相互の間に制御棒を
出し入れできる隙間を形成するようにしている。
ところで、各燃料集合体における燃料棒の定期的
な検査時または新燃料棒との交換時にはチヤンネ
ルボツクスの脱着すなわちばね組立体の脱着が必
要であるが、それらの脱着作業はチヤンネルボツ
クスやばね組立体が炉の運転によつて放射能を帯
びているので、燃料集合体を貯蔵プールに収容し
て行われる。 In general, in a boiling water reactor, a large number of parallel fuel assemblies are supported in a lattice-like frame so that four fuel assemblies are arranged in a unit grid, and In order to allow control rods to be inserted and removed from below between the assemblies and to elastically support each assembly, a corner portion of each fuel assembly is located at the center of the unit cell of the frame. As is widely known from the invention of Japanese Patent Publication No. 44-9556, the spring assembly consists of a bifurcated leaf spring that hangs down along two orthogonal vertical planes and a vertically angled protective member. Place the horizontal head on the corner plate at the top of the channel box of the fuel assembly, insert a bolt from above and screw it into the corner post of the upper tie plate to fix the spring assembly, and place the horizontal head on the corner plate at the upper end of the channel box of the fuel assembly. The leaf springs of the fuel assemblies are pressed against each other to form a gap between the fuel assemblies through which the control rod can be inserted and taken out.
By the way, when periodically inspecting the fuel rods in each fuel assembly or replacing them with new fuel rods, it is necessary to remove and remove the channel box, that is, to remove the spring assembly. Because the fuel becomes radioactive due to the operation of the reactor, the fuel assembly is stored in a storage pool.
そして、定着ボルトをねじ戻して上部タイプレ
ートのコーナ柱から引き抜くわけであるが、その
際、ボルトがコーナ柱ばかりでなく、保護部材の
水平頭部におけるねじ孔からも抜け出すことにな
ると、ばね組立体が分解してプール中に落ち込む
恐れがあるところから、通常にはボルトのねじの
上部にすえ込み加工を施して、ボルトをねじ戻し
た際に保護部材の水平頭部のねじ孔にかみ合わな
いようにしている。 Then, the fixing bolt is unscrewed and pulled out from the corner post of the upper tie plate, but at that time, if the bolt comes out not only from the corner post but also from the screw hole in the horizontal head of the protective member, the spring assembly Because there is a risk that the three-dimensional object may disintegrate and fall into the pool, the upper part of the bolt thread is usually swaged so that when the bolt is unscrewed, it will not engage with the screw hole in the horizontal head of the protective member. That's what I do.
また、ボルトを上部タイプレートのコーナ柱か
らねじ戻すに当たつては第１図に示すような工具
が用いられている。すなわち、長さが約4mで直
径約３cm程度のステンレス鋼製の外パイプ１中に
下端にボルト頭部３ｂの嵌合つかみ具２ｂを取付
けた中ロツド２が軸方向に摺動可能に内装され、
そのロツド頭部２ａと外パイプ１の上端内部との
間にスプリングＳが配設され、このスプリングＳ
により外パイプ１を下方に付勢し、パイプ下端の
肉厚部１ｂによつて、上記つかみ具２ｂの下部周
壁に放射方向に出没自在に設けられた数個のボー
ルｂを抑止するようになつており、その使用時に
は外パイプ１のハンドル１ａと中ロツド２のハン
ドル２ｃを握つて、外パイプ１を若干持ち上げ、
ボールｂに対する抑止を解いておいて、つかみ具
２ｂをボルト３の頭部３ｂに嵌合させると同時に
ボールｂをボルト頭部３ｂの環状凹溝に嵌め込
み、次いで外パイプ１をスプリングＳの復元力で
下降させ、再び下端肉厚部１ｂによつてボールｂ
を抑止することによつて、工具をボルト頭部３ｂ
に結合させ、外パイプ１を反時計方向に回転させ
ることによりボルト３を上部タイプレートＢのコ
ーナ柱B1から引き抜くようになつている。（第１
図中のＡは燃料集合体のチヤンネルボツクス、
A1はそのコーナ板、４は上記ばね組立体の保護
部材、５は板ばねである。）
ところで、上記棒状の工具は細長く他に支える
ものを持たないために傾き易く、また、組立体の
変形により上部タイプレートが傾く場合があり、
そのようなとき、ボルト３のねじ部３ａの上端の
すえ込み加工が完全でないと、ボルト３をねじ戻
した際、ねじ部３ａの上端が保護部材４の水平頭
部４ａのねじ孔４ｂにかみ合つてしまい、ボルト
３が回転不能になり、ばね組立体が取外せなくな
ることがある。 Further, a tool as shown in FIG. 1 is used to unscrew the bolt from the corner post of the upper tie plate. That is, inside an outer pipe 1 made of stainless steel with a length of about 4 m and a diameter of about 3 cm, an inner rod 2 with a fitting grip 2b for a bolt head 3b attached to the lower end is installed so as to be able to slide in the axial direction. ,
A spring S is disposed between the rod head 2a and the inside of the upper end of the outer pipe 1.
The outer pipe 1 is urged downward, and the thick wall portion 1b at the lower end of the pipe restrains several balls b provided on the lower circumferential wall of the grip 2b so as to be freely retractable in the radial direction. When using it, grasp the handle 1a of the outer pipe 1 and the handle 2c of the middle rod 2, and lift the outer pipe 1 slightly.
Release the restraint on the ball b, fit the grip 2b into the head 3b of the bolt 3, and at the same time fit the ball b into the annular groove of the bolt head 3b, and then move the outer pipe 1 to the restoring force of the spring S. the ball b by lower end thick part 1b again.
By restraining the tool from bolt head 3b
The bolt 3 is pulled out from the corner post B1 of the upper tie plate B by connecting the outer pipe 1 to the corner column B1 and rotating the outer pipe 1 counterclockwise. (1st
A in the figure is the channel box of the fuel assembly.
A 1 is a corner plate thereof, 4 is a protective member of the spring assembly, and 5 is a leaf spring. ) By the way, the rod-shaped tool mentioned above is long and thin and has no other support, so it tends to tilt, and the upper tie plate may tilt due to deformation of the assembly.
In such a case, if the upper end of the threaded part 3a of the bolt 3 is not completely swaged, the upper end of the threaded part 3a may get caught in the screw hole 4b of the horizontal head 4a of the protection member 4 when the bolt 3 is unscrewed. If they do, the bolt 3 may become unable to rotate and the spring assembly may not be able to be removed.
この考案は上記不具合を解消すべく工夫された
もので、ばね組立体の保護部材の水平頭部とチヤ
ンネルボツクス上のコーナ板との間に形成される
隙間にピツク部材の水平片の先端部を介入させ、
ボルトのねじ戻し時にばね組立体をボルトと一諸
に持ち上げるようになし、ボルトと保護部材のね
じ孔とのかみ合いを防いで、ばね組立体をボルト
と共に容易、確実に取外すことができ、しかも誤
操作することのない取外し装置を提供するもので
あり、外パイプと下端につかみ具を有する中ロツ
ドとからなり、つかみ具を上部タイプレートのコ
ーナ柱にねじ込んだばね組立体固定用のボルトの
頭部に係合させて、ボルトを取外す装置におい
て、外パイプの下端から所要高さ位置に位置決め
リングを固定し、その下側には上端にストツプリ
ングを設け下方位置にラチエツト歯を備えたラチ
エツト筒を配設し、該ラチエツト筒の下部には三
方にピンケースを有する短筒状のラチエツトボツ
クスを嵌挿してラチエツト歯を包囲し、一つのピ
ンケースにはラチエツト歯に係止する爪ピンを軸
支させると共に他のピンケースには押えピンを軸
支させ、二方の押えピンの収納ケース間の中央部
には放射状に耳片を設け、該耳片には所要長さの
縦片と前方のピンケースに向う扇形状の水平片か
らなるピツク部材を取付け、上記耳片の後方のピ
ンケースには垂直片と上部タイプレート上の把手
に係合する直角部を有する水平片とからなる回り
止め部材を取付けたことを特徴としている。 This idea was devised to solve the above-mentioned problem, and the tip of the horizontal piece of the pick member is inserted into the gap formed between the horizontal head of the protective member of the spring assembly and the corner plate on the channel box. Intervene,
When unscrewing the bolt, the spring assembly is lifted together with the bolt, preventing the bolt from engaging with the threaded hole of the protective member, allowing the spring assembly to be removed together with the bolt easily and reliably, and preventing erroneous operation. The device is comprised of an outer pipe and an inner rod with a grip at the lower end, and the grip is screwed into the corner post of the upper tie plate to attach the head of the bolt for fixing the spring assembly. In this device, a positioning ring is fixed at a required height from the lower end of the outer pipe, and a ratchet cylinder with a stop ring at the upper end and ratchet teeth at the lower position is arranged below the positioning ring. A short cylindrical ratchet box with pin cases on three sides is fitted into the lower part of the ratchet cylinder to surround the ratchet teeth, and one pin case has a pawl pin that is axially supported to lock onto the ratchet teeth. At the same time, the presser pin is pivotally supported in the other pin case, and an ear piece is provided radially in the center between the two presser pin storage cases, and the ear piece has a vertical piece of the required length and a front piece. A pick member consisting of a fan-shaped horizontal piece facing the pin case is attached, and a rotation stopper consisting of a vertical piece and a horizontal piece having a right angle part that engages with the handle on the upper tie plate is attached to the pin case behind the ear piece. It is characterized by the fact that parts are attached.
以下、図面参照の上この考案の実施例について
説明する。 Embodiments of this invention will be described below with reference to the drawings.
第２図において１はステンレス鋼製の取外し工
具の外パイプで、長さが約4m、直径約３cm程度
のもので、内部には下端にボルト頭部３ｂの嵌合
つかみ具２ｂを有する中ロツド２が摺動可能に内
装され、そのロツド頭部と外パイプの上端内部と
の間にスプリングが配設され、このスプリングの
ばね力で外パイプ１は下方に付勢され、パイプ下
端の肉厚部１ｂによつて、つかみ具２ｂの下部周
壁に放射方向に出没自在に埋設された数個のボー
ルｂを抑止するようになされている点の構成は前
記のとおりである。 In Fig. 2, reference numeral 1 is the outer pipe of the stainless steel removal tool, which is about 4 m long and about 3 cm in diameter. A spring is disposed between the rod head and the inside of the upper end of the outer pipe, and the spring force of this spring urges the outer pipe 1 downward, reducing the wall thickness of the lower end of the pipe. The structure in which the portion 1b is adapted to restrain the several balls b embedded in the lower circumferential wall of the grip 2b so as to be freely retractable in the radial direction is as described above.
ところで、上記外パイプ１の外周の下端から所
要高さ位置（大体165mm程度）には位置決め用の
リング１０が複数のねじにより固定されており、
その下側にはラチエツト筒１１が嵌挿配置され、
上端の小径段部に取付けたストツプリング１２を
位置決めリング１０に当接させ、下端部において
複数の止めねじにより外パイプ１に対し固定され
ている。このラチエツト筒１１は第４図イにみら
れるように下方部位にラチエツト歯１１ａが一体
に設けられ、筒部上方にはばね受けリング１３
が、下方にはラチエツトボツクス１４のキヤツプ
リング１４ａが嵌挿され、両リング１３，１４間
には緩衝用のスプリング１３ａが巻回され、その
スプリング１３ａの作用でばね受けリング１３は
ストツプリング１２の下面に、またキヤツプリン
グ１４ａはラチエツト歯１１ａ上面に当接してい
る。 By the way, a positioning ring 10 is fixed by a plurality of screws at a required height position (approximately 165 mm) from the lower end of the outer circumference of the outer pipe 1.
A ratchet cylinder 11 is fitted and arranged on the lower side thereof,
A stop ring 12 attached to the small diameter stepped portion at the upper end is brought into contact with the positioning ring 10, and is fixed to the outer pipe 1 at the lower end by a plurality of setscrews. This ratchet cylinder 11 is integrally provided with ratchet teeth 11a at the lower part, as shown in FIG.
However, the cap ring 14a of the ratchet box 14 is fitted below, and a buffer spring 13a is wound between both rings 13 and 14, and the action of the spring 13a causes the spring receiver ring 13 to move around the stop ring 12. On the lower surface, the cap ring 14a also abuts on the upper surface of the ratchet tooth 11a.
また、ラチエツト筒１１の下方部位にはラチエ
ツト歯１１ａを包囲する短筒状のラチエツトボツ
クス１４が下側から嵌挿され、その上面にキヤツ
プリング１４ａがねじ止めされる。 Further, a short cylindrical ratchet box 14 that surrounds the ratchet teeth 11a is fitted into the lower part of the ratchet tube 11 from below, and a cap ring 14a is screwed onto the upper surface of the ratchet box 14.
上記のラチエツトボツクス１４には第３図およ
び第４図ロにみられるように周囲を三等分する位
置にピンケース１４ｂが放射状に設けられ、その
一つのピンケース１４ｂの内部にはつば付の爪ピ
ン１５が軸支され、スプリング１５ａで内向きに
付勢されて先端の爪がラチエツト歯１１ａに係止
しており、そして、他の二つのケース１４ｂ中に
は同じくつば付の押えピン１６が軸支され、スプ
リング１６ａにより内向きに付勢され、先端がラ
チエツト歯１１ａの側面に圧接していて、これら
のピンによつてラチエツトボツクス１４はラチエ
ツト筒１の外周所定の位置に保持されている。 As shown in FIGS. 3 and 4 B, the ratchet box 14 is provided with pin cases 14b radially arranged at positions dividing the circumference into thirds, and one of the pin cases 14b has a collar inside. A pawl pin 15 is pivotally supported, and is urged inward by a spring 15a, so that the pawl at the tip engages with the ratchet tooth 11a.In the other two cases 14b, there is also a presser pin with a collar. 16 is pivotally supported, is urged inward by a spring 16a, and its tip is in pressure contact with the side surface of the ratchet tooth 11a, and these pins hold the ratchet box 14 at a predetermined position on the outer periphery of the ratchet cylinder 1. has been done.
また、ラチエツトボツクス１４の押えピン１６
を収容した二つのピンケース１４ｂの間の中央位
置には放射状の耳片１４ｃが形成され、この耳片
１４ｃには、所要長さの縦片１７ａとその下端に
おいて前方のピンケース１４ｂ側に向つて水平に
折曲した扇形状の水平片１７ｂとからなるピツク
部材１７の上端が固定されており、更に耳片１４
ｃの後側に当たるピンケース１４ｂの側面には、
垂直片１８ａと前向きの水平片１８ｂとからな
り、水平片１８ｂに上部タイプレートの把手の内
側面に当接する短辺と他の側面に当接する長辺と
で直角部１８ｃを形成した回り止め部材１８が取
付けられている。 In addition, the presser pin 16 of the ratchet box 14
A radial lug 14c is formed at the center between the two pin cases 14b that house the pin case 14b. The upper end of the pick member 17 consisting of a fan-shaped horizontal piece 17b bent horizontally is fixed, and the ear piece 14
On the side of the pin case 14b, which corresponds to the rear side of c.
A detent member 18 is composed of a vertical piece 18a and a forward-facing horizontal piece 18b, and a right-angled part 18c is formed on the horizontal piece 18b by a short side that abuts the inner surface of the handle of the upper tie plate and a long side that abuts the other side. is installed.
なお、上記の部材はすべてステンレス鋼で作ら
れ、接触回転するラチエツト筒１１、爪ピン１５
および押えピン１６は熱処理を施し、ピツク部材
１７の水平片内側先端には表面硬化処理を施して
摩耗し難いようにしている。 The above members are all made of stainless steel, including the ratchet cylinder 11 and claw pin 15 that rotate in contact with each other.
The holding pin 16 is heat treated, and the inner tip of the horizontal piece of the pick member 17 is surface hardened to prevent wear.
上記構成のもとに、その使用に当たつては、貯
蔵プール上のデツキからの上記各部材の取付けら
れた外パイプ１をプール中に挿入し、外パイプ１
を前述のように中ロツド２に対し若干上方に持ち
上げて、つかみボールｂに対する抑止を解除して
おき、かつ、ピツク部材１７の水平片１７ｂおよ
び回り止め部材１８の水平片１８ｂが第３図鎖線
示のような向きをとるようにして外パイプ１を下
降させ、中ロツド下端のつかみ具２ｂを上部タイ
プレートＢのコーナ柱B1にねじ込まれたボルト
の頭部３ｂに嵌め込みながら外パイプ１を反時計
方向に若干（30゜程度）回転させ、ピツク部材１
７の水平片１７ｂの内側先端部を第２図および第
５図のようにチヤンネルボツクスＡ上のコーナ板
A1と保護部材４の水平頭部４ａとの間に形成さ
れる隙間に差し込むと共に回り止め部材１８の水
平片１８ｂに設けた直角部１８ｃを上部タイプレ
ートＢ上の門形把手B2の一方の縦柱に係合させ
る。 When using the above structure, the outer pipe 1 to which each of the above members is attached is inserted from the deck above the storage pool into the pool, and the outer pipe 1
As mentioned above, lift the pin slightly upwards with respect to the middle rod 2 to release the restraint on the gripping ball b, and the horizontal piece 17b of the pick member 17 and the horizontal piece 18b of the detent member 18 are aligned with the chain line in FIG. Lower the outer pipe 1 in the direction shown, and lower the outer pipe 1 while fitting the grip 2b at the lower end of the middle rod into the head 3b of the bolt screwed into the corner post B1 of the upper tie plate B. Rotate it slightly counterclockwise (about 30 degrees) and remove the pick member 1.
Attach the inner tip of the horizontal piece 17b of No. 7 to the corner plate on the channel box A as shown in FIGS.
Insert into the gap formed between A 1 and the horizontal head 4a of the protection member 4, and insert the right angle part 18c provided on the horizontal piece 18b of the anti-rotation member 18 into one side of the gate-shaped handle B 2 on the upper tie plate B. engage the vertical column of the
しかる後に、外パイプ１の持ち上げを解除して
スプリングＳ（第１図）の作用で押下げ、下端の
肉厚部１ｂによつてボルト頭部３ｂの環状凹溝に
係合しているボールｂを抑止して工具本体をボル
ト３に結合させる。 After that, the lifting of the outer pipe 1 is released and the outer pipe 1 is pushed down by the action of the spring S (Fig. 1), and the ball b which is engaged with the annular groove of the bolt head 3b by the thick wall part 1b at the lower end is removed. The tool body is coupled to the bolt 3 by restraining the
この状態で、ハンドルを操作して外パイプ１を
ボルトの弛む方向（反時計方向）に回転させれ
ば、ピツク部材１７を備えたラチエツトボツクス
１４は回転することなく、爪ピン１５および押え
ピン１６による若干の抵抗は伴うもののラチエツ
ト筒１１が外パイプ１と一体に回転し、上部タイ
プレートＢのコーナ柱B1上に固定されたボルト
３をねじ戻すことになる。 In this state, if the handle is operated to rotate the outer pipe 1 in the direction in which the bolts loosen (counterclockwise), the ratchet box 14 equipped with the pick member 17 will not rotate, and the claw pin 15 and the presser pin The ratchet cylinder 11 rotates together with the outer pipe 1, although there is some resistance caused by the bolt 16, and the bolt 3 fixed on the corner post B1 of the upper tie plate B is unscrewed.
その際には、ピツク部材水平片１７ｂの内側先
端部が保護部材４の水平頭部４ａの下面に係合し
ていて、ボルト３のねじ戻しにつれて保護部材４
と板ばね５をそれと同時に持ち上げることにな
る。 At that time, the inner tip of the pick member horizontal piece 17b is engaged with the lower surface of the horizontal head 4a of the protection member 4, and as the bolt 3 is unscrewed, the protection member 4
and the leaf spring 5 will be lifted at the same time.
そのため、ボルト３のねじ部が保護部材４のね
じ孔にかみ合うことなく、ボルト３が回転不能に
なつたりまたはばね組立体がばらばらになる恐れ
はない。 Therefore, the threaded portion of the bolt 3 does not engage with the threaded hole of the protection member 4, and there is no risk that the bolt 3 will become unable to rotate or that the spring assembly will come apart.
一方、外パイプ１をボルト３をねじ込む方向に
操作した際には、ラチエツト歯１１ａと爪ピン１
５との係止関係および回り止め部材水平片１８ｂ
の直角部１８ｃの短辺と把手B2の内側面との係
合関係によつて外パイプ１を回転させることがで
きない。したがつて、外パイプ１の操作を誤つた
り、保護部材４の水平頭部４ａの下面に係合して
いるピツク部材１７の水平片１７ｂが妄りに外れ
たりしない。 On the other hand, when the outer pipe 1 is operated in the direction of screwing in the bolt 3, the ratchet teeth 11a and the pawl pin 1
Locking relationship with 5 and rotation prevention member horizontal piece 18b
The outer pipe 1 cannot be rotated due to the engagement relationship between the short side of the right-angled portion 18c and the inner surface of the handle B2 . Therefore, the outer pipe 1 will not be operated incorrectly, and the horizontal piece 17b of the pick member 17, which is engaged with the lower surface of the horizontal head 4a of the protection member 4, will not accidentally come off.
以上のようにこの考案では、燃料集合体の上部
タイプレートのコーナ柱上にばね組立体を定着し
たボルトを取外すに当たり、保護部材の水平頭部
の下面にピツク部材の水平片を係合させ、ボルト
のねじ戻しと同時にばね組立体を持ち上げるよう
にしたので、ボルトが保護部材のねじ孔にかみ合
う恐れなく、ボルトが回転不能になつたり、ばね
組立体が分解したりせず、ばね組立体をボルトと
共に安全確実に取外すことができ、そして、外パ
イプはラチエツト機構と回り止め部材によりボル
トのねじ込み方向には回転しないようにしたの
で、取外し作業中に誤操作する恐れなく、また保
護部材に係合したピツク部材の水平片が外れるこ
とがない。 As described above, in this invention, when removing the bolt fixing the spring assembly on the corner column of the upper tie plate of the fuel assembly, the horizontal piece of the pick member is engaged with the lower surface of the horizontal head of the protection member, Since the spring assembly is lifted at the same time as the bolt is unscrewed, there is no fear that the bolt will engage with the threaded hole in the protective member, and the bolt will not be able to rotate or the spring assembly will disassemble. It can be removed together with the bolt safely and reliably, and since the outer pipe is prevented from rotating in the screwing direction of the bolt by the ratchet mechanism and anti-rotation member, there is no risk of erroneous operation during the removal process, and the outer pipe can be easily engaged with the protective member. The horizontal piece of the pick member will not come off.
第１図は従来の取外し装置をボルト頭部に結合
した状態の側面図。第２図はこの考案の取外し装
置をボルト頭部に結合した状態の一部切断側面
図。第３図は第２図のＸ−Ｘ線に沿つた一部切断
平面図。第４図イはラチエツト筒の斜視図。同図
ロはラチエツトボツクスの斜視図。第５図は燃料
集合体に考案装置を取付けた状態の斜視図。
図中、１……外パイプ、１ｂ……肉厚部、２…
…中ロツド、２ｂ……つかみ具、３……ボルト、
３ｂ……頭部、４……保護部材、５……板ばね、
１０……位置決めリング、１１……ラチエツト
筒、１１ａ……ラチエツト歯、１２……ストツプ
リング、１４……ラチエツトボツクス、１４ｂ…
…ピンケース、１５……爪ピン、１６……押えピ
ン、１７……ピツク部材、１７ｂ……水平片、１
８……回り止め部材、１８ｂ……水平片、１８ｃ
……直角部。
FIG. 1 is a side view of a conventional removal device coupled to a bolt head. FIG. 2 is a partially cutaway side view of the removal device of this invention coupled to the bolt head. FIG. 3 is a partially cutaway plan view taken along the line XX in FIG. 2. FIG. 4A is a perspective view of the ratchet tube. Figure B is a perspective view of the ratchet box. FIG. 5 is a perspective view of the device attached to the fuel assembly. In the figure, 1...Outer pipe, 1b...Thick wall part, 2...
...Medium rod, 2b...Gripper, 3...Bolt,
3b... Head, 4... Protective member, 5... Leaf spring,
10...Positioning ring, 11...Ratchet cylinder, 11a...Ratchet tooth, 12...Stop ring, 14...Ratchet box, 14b...
... Pin case, 15 ... Claw pin, 16 ... Presser pin, 17 ... Pick member, 17b ... Horizontal piece, 1
8... Rotating member, 18b... Horizontal piece, 18c
...Right angle part.
Claims (1)
ツド２とからなり、つかみ具２ｂを上部タイプレ
ートＢのコーナ柱B1にねじ込んだばね組立体固
定用のボルトの頭部３ｂに係合させて、ボルト３
を取外す装置において、外パイプ１の下端から所
要高さ位置に位置決めリング１０を固定し、その
下側には上端にストツプリング１２を設け下方位
置にラチエツト歯１１ａを備えたラチエツト筒１
１を配設し、該ラチエツト筒１１の下部には三方
にピンケース１４ｂを有する短筒状のラチエツト
ボツクス１４を嵌挿してラチエツト歯１１ａを包
囲し、一つのピンケース１４ｂにはラチエツト歯
１１ａに係止する爪ピン１５を軸支させると共に
他のピンケース１４ｂには押えピン１６を軸支さ
せ、二方の押えピン１６の収納ケース１４ｂ間の
中央部には放射状に耳片１４ｃを設け、該耳片１
４ｃには所要長さの縦片１７ａと前方のピンケー
ス１４ｂに向う扇形状の水平片１７ｂからなるピ
ツク部材１７を取付け、上記耳片１４ｃの後方の
ピンケース１４ｂには垂直片１８ａと上部タイプ
レートＢ上の把手B2に係合する直角部１８ｃを
有する水平片１８ｂとからなる回り止め部材１８
を取付けてなる燃料集合体におけるばね組立体の
取外し装置。 It consists of an outer pipe 1 and an inner rod 2 having a grip 2b at the lower end, and the grip 2b is engaged with the head 3b of a bolt for fixing the spring assembly screwed into the corner post B1 of the upper tie plate B. , bolt 3
In the removal device, a positioning ring 10 is fixed at a required height from the lower end of the outer pipe 1, and a stop ring 12 is provided at the upper end of the outer pipe 1, and a ratchet cylinder 1 is provided with ratchet teeth 11a at a lower position.
A short cylindrical ratchet box 14 having pin cases 14b on three sides is fitted into the lower part of the ratchet cylinder 11 to surround the ratchet teeth 11a, and one pin case 14b has a ratchet tooth 11a. A claw pin 15 that is engaged with the holding pin 15 is pivotally supported, and a presser pin 16 is pivotally supported on the other pin case 14b, and an ear piece 14c is provided radially in the center between the storage cases 14b of the two presser pins 16. , the ear piece 1
A pick member 17 consisting of a vertical piece 17a of a required length and a fan-shaped horizontal piece 17b facing the front pin case 14b is attached to 4c, and a vertical piece 18a and an upper type are attached to the pin case 14b behind the ear piece 14c. A detent member 18 consisting of a horizontal piece 18b having a right angle part 18c that engages the handle B2 on the rate B.
A spring assembly removal device for a fuel assembly in which a spring assembly is attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984036071U JPS60148994U (en) | 1984-03-15 | 1984-03-15 | Spring assembly removal device in fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984036071U JPS60148994U (en) | 1984-03-15 | 1984-03-15 | Spring assembly removal device in fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60148994U JPS60148994U (en) | 1985-10-03 |
| JPH023197Y2 true JPH023197Y2 (en) | 1990-01-25 |
Family
ID=30540925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984036071U Granted JPS60148994U (en) | 1984-03-15 | 1984-03-15 | Spring assembly removal device in fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60148994U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2563427B2 (en) * | 1988-01-27 | 1996-12-11 | 株式会社東芝 | Channel fastener desorption device and channel fastener storage container |
-
1984
- 1984-03-15 JP JP1984036071U patent/JPS60148994U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60148994U (en) | 1985-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0229029B1 (en) | Retaining pin assembly for control-rod guide-tubes in nuclear reactors | |
| JPH023197Y2 (en) | ||
| JPH01217295A (en) | Guide pin assembly for nuclear reactor | |
| JPS6333009B2 (en) | ||
| JPS59137887A (en) | Nuclear fuel assembly | |
| JPH023198Y2 (en) | ||
| JPS6331065B2 (en) | ||
| JPH02296193A (en) | Spring type lock washer for tie rod nut | |
| JPS6266193A (en) | Reusable clamping device in fuel aggregate | |
| US4648526A (en) | Safety cap for a pressurized cylinder | |
| CN106402132A (en) | Special-shaped locking gasket for reactor core shell bearing ball cover plate of high temperature gas cooled reactor | |
| US5727431A (en) | Blind nut tool | |
| JPS6336314Y2 (en) | ||
| JP4291277B2 (en) | Method and apparatus for locking a nuclear fuel assembly in place in a housing | |
| KR820001722B1 (en) | A remote assemblage and disassemblage of fuel assembly for a nuclear reactor | |
| EP0212902A2 (en) | Method of removing and replacing locking screws in a nuclear fuel assembly | |
| JPS643105Y2 (en) | ||
| JPH0720278A (en) | Method and rack for storing spent fuel assembly | |
| JP3051849B2 (en) | Bolt protection cap removal tool | |
| JPH0550399U (en) | Nut member for fuel assembly | |
| US5052249A (en) | Bolt wrench | |
| JPH023200Y2 (en) | ||
| JPS6262289A (en) | Shroud head bolt treater | |
| JPH0222719Y2 (en) | ||
| JPS5930238B2 (en) | Handling tools for nuclear reactors |