JPH025435Y2 - - Google Patents
Info
- Publication number
- JPH025435Y2 JPH025435Y2 JP1985163970U JP16397085U JPH025435Y2 JP H025435 Y2 JPH025435 Y2 JP H025435Y2 JP 1985163970 U JP1985163970 U JP 1985163970U JP 16397085 U JP16397085 U JP 16397085U JP H025435 Y2 JPH025435 Y2 JP H025435Y2
- Authority
- JP
- Japan
- Prior art keywords
- plenum spring
- spring
- fuel
- plenum
- fuel pellet
- 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
- 239000008188 pellet Substances 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 24
- 238000003825 pressing Methods 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 10
- 239000003758 nuclear fuel Substances 0.000 claims description 8
- 238000005253 cladding Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-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
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案は、被覆管内に挿入された燃料ペレツト
を押圧するための核燃料要素用プレナムスプリン
グに関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a plenum spring for a nuclear fuel element for compressing fuel pellets inserted into a cladding tube.
一般に、原子炉用の核燃料要素は長尺の被覆管
内に多数の燃料ペレツトを同軸的に充填すること
によつて形成されている。
Generally, nuclear fuel elements for nuclear reactors are formed by coaxially filling a long cladding tube with a large number of fuel pellets.
第３図は、原子炉に使用される従来の核燃料要
素の縦断面図であつて、ジルコニウム合金または
ステンレス鋼製の被覆管１内に二酸化ウランUO2
などの燃料ペレツト２を所定数装填し、上記被覆
管１の頂端に溶着された上部端栓３と上記燃料ペ
レツト２の頂端部との間に介装されたプレナムス
プリング４によつて、上記燃料ペレツト２を下部
端栓５側に押圧するようにしてある。 FIG. 3 is a longitudinal cross-sectional view of a conventional nuclear fuel element used in a nuclear reactor, in which uranium dioxide UO 2 is contained in a zirconium alloy or stainless steel cladding tube 1.
A predetermined number of fuel pellets 2, such as The pellet 2 is pressed against the lower end plug 5 side.
ところで、上記プレナムスプリング４は、第４
図ａに示すように螺旋巻のまま必要長さで切断
し、その燃料ペレツト押圧側端面４ａがプレナム
スプリング４の中心線に対して90度の角度となる
ように端面研磨し、その後第４図ｂに示すように
その端面に燃料ペレツト押え板６が溶着されてい
る。 By the way, the plenum spring 4 has a fourth
As shown in Figure a, the spirally wound product is cut to the required length, and the end face is polished so that the end face 4a on the fuel pellet pressing side forms a 90 degree angle with respect to the center line of the plenum spring 4, and then the end face is polished as shown in Figure 4. As shown in b, a fuel pellet holding plate 6 is welded to the end face.
ところが、上記プレナムスプリングを製造する
ためには、押圧側端面の研磨を行わなければなら
ず、研磨用機械、周辺治工具等を必要とし、特に
研磨用砥石等の消耗品費用が多くかかる等の問題
がある。 However, in order to manufacture the above-mentioned plenum spring, the pressing side end face must be polished, which requires a polishing machine, peripheral jigs, etc., and in particular requires a high cost for consumables such as polishing grindstones. There's a problem.
本考案はこのような点に鑑み、プレナムスプリ
ングの燃料ペレツト押圧側端面の研磨を行なう必
要がなく、十分上記端面を中心軸線に対して直交
する面内にあるようにし、その機能を十分果し得
るプレナムスプリングを得ることを目的とする。
In view of these points, the present invention eliminates the need to polish the end face of the plenum spring on the fuel pellet pressing side, and makes sure that the end face lies within a plane perpendicular to the central axis, so that it can fully perform its function. The aim is to obtain a plenum spring.
本考案は、被覆管内に挿入された燃料ペレツト
を押圧するための核燃料要素用プレナムスプリン
グにおいて、上記プレナムスプリングの燃料ペレ
ツト押圧側端面が上記プレナムスプリングの中心
線に対して90゜の角度となるように、螺旋巻から
最終巻に入る直前でスプリングの巻きピツチを零
としたことを特徴とする。
The present invention provides a plenum spring for a nuclear fuel element for pressing fuel pellets inserted into a cladding tube, in which the end surface of the plenum spring on the fuel pellet pressing side forms an angle of 90 degrees with respect to the center line of the plenum spring. Another feature is that the winding pitch of the spring is zero just before entering the final winding from the spiral winding.
以下、第１図および第２図を参照して本考案の
一実施例について説明する。
Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 and 2.
第１図ａは本考案のプレナムスプリング４の側
面図であつて、その燃料ペレツト押圧側部におい
て、螺旋巻とされたプレナムスプリングのコイル
最終巻直前のＡ点で曲げ加工が行なわれ、燃料ペ
レツト押圧側端面４ａが中心軸線に対して90゜の
角度となるように最終巻のピツチが零としてあ
る。そして、第１図ｂに示すように、上記中心軸
線に対して90°をなしている燃料ペレツト押圧側
端面４ａに燃料ペレツト押え板６が溶着されてい
る。 FIG. 1a is a side view of the plenum spring 4 of the present invention, in which the fuel pellet pressing side is bent at point A just before the last coil winding of the spirally wound plenum spring, and the fuel pellets are The pitch of the final winding is set to zero so that the pressing side end surface 4a forms an angle of 90° with respect to the central axis. As shown in FIG. 1b, a fuel pellet pressing plate 6 is welded to the fuel pellet pressing side end surface 4a which is at an angle of 90° to the central axis.
しかして、第２図に示すように、上記プレナム
スプリング４を被覆管１内に挿入し、その燃料ペ
レツト押え板６を燃料ペレツト２に当接せしめる
ことにより、その燃料ペレツト２を下部端栓５側
に均一に押圧することができる。 As shown in FIG. 2, by inserting the plenum spring 4 into the cladding tube 1 and bringing the fuel pellet presser plate 6 into contact with the fuel pellet 2, the fuel pellet 2 is pushed into the lower end plug 5. It can be pressed evenly on both sides.
以上説明したように、本考案においてはプレナ
ムスプリングの燃料ペレツト押圧側端面が上記プ
レナムスプリングの中心線に対して90゜の角度と
なるように、螺旋巻から最終巻に入る直前でスプ
リングの巻きピツチを零としたので、従来のよう
に燃料ペレツト押圧側端面を研磨加工する必要が
なく、特別の研磨機等を備える必要もなく、製造
コストの低減を図ることができ、しかも従来のプ
レナムスプリングと全く同一機能を果すことがで
きる。
As explained above, in the present invention, the winding pitch of the spring is adjusted just before entering the final winding from the spiral winding so that the end face of the plenum spring on the fuel pellet pressing side forms an angle of 90° with respect to the center line of the plenum spring. Since it has been made zero, there is no need to polish the end face of the fuel pellet pressing side as in the past, and there is no need to equip a special polishing machine, etc., making it possible to reduce manufacturing costs. They can perform exactly the same function.
第１図ａは本考案のプレナムスプリングの側面
図、第１図ｂは同上燃料ペレツト押え板を溶着し
た状態を示す図、第２図は本考案のプレナムスプ
リングを装着した核燃料要素の一部切欠き側面
図、第３図は従来の核燃料要素の縦断面図、第４
図ａは従来のプレナムスプリングの製造過程説明
図、第４図ｂは燃料ペレツト押え板を装着した状
態を示す従来のプレナムスプリングの部分図であ
る。
１……被覆管、２……燃料ペレツト、３……上
部端栓、４……プレナムスプリング、４ａ……燃
料ペレツト押圧側端面、６……燃料ペレツト押え
板。
Fig. 1a is a side view of the plenum spring of the present invention, Fig. 1b is a view showing the above fuel pellet holding plate welded, and Fig. 2 is a partial cutaway of a nuclear fuel element equipped with the plenum spring of the present invention. Figure 3 is a cutaway side view, and Figure 4 is a vertical cross-sectional view of a conventional nuclear fuel element.
FIG. 4A is an explanatory diagram of the manufacturing process of a conventional plenum spring, and FIG. 4B is a partial view of the conventional plenum spring showing a state in which a fuel pellet presser plate is attached. DESCRIPTION OF SYMBOLS 1...Claying tube, 2...Fuel pellet, 3...Upper end plug, 4...Plenum spring, 4a...Fuel pellet pressing side end surface, 6...Fuel pellet pressing plate.
Claims (1)
ための核燃料要素用プレナムスプリングにおい
て、上記プレナムスプリングの燃料ペレツト押圧
側端面が上記プレナムスプリングの中心線に対し
て90゜の角度となるように、螺旋巻から最終巻に
入る直前でスプリングの巻きピツチを零としたこ
とを特徴とする、核燃料要素用プレナムスプリン
グ。 In a plenum spring for a nuclear fuel element for pressing fuel pellets inserted into a cladding tube, the plenum spring is spirally wound so that the fuel pellet pressing side end face of the plenum spring forms an angle of 90° with respect to the center line of the plenum spring. A plenum spring for nuclear fuel elements, characterized in that the winding pitch of the spring is zero just before entering the final winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985163970U JPH025435Y2 (en) | 1985-10-25 | 1985-10-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985163970U JPH025435Y2 (en) | 1985-10-25 | 1985-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6273292U JPS6273292U (en) | 1987-05-11 |
| JPH025435Y2 true JPH025435Y2 (en) | 1990-02-08 |
Family
ID=31092659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985163970U Expired JPH025435Y2 (en) | 1985-10-25 | 1985-10-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH025435Y2 (en) |
-
1985
- 1985-10-25 JP JP1985163970U patent/JPH025435Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6273292U (en) | 1987-05-11 |
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