JPS58140675A - Nuclear fuel element - Google Patents
Nuclear fuel elementInfo
- Publication number
- JPS58140675A JPS58140675A JP57022832A JP2283282A JPS58140675A JP S58140675 A JPS58140675 A JP S58140675A JP 57022832 A JP57022832 A JP 57022832A JP 2283282 A JP2283282 A JP 2283282A JP S58140675 A JPS58140675 A JP S58140675A
- Authority
- JP
- Japan
- Prior art keywords
- nuclear
- fuel element
- fuel
- nuclear fuel
- cladding tube
- 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.)
- Pending
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
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は原子炉用核燃料要素に係り、特に、被覆管の上
下両端に端栓を有し内部に燃料ペレットを積層してなる
原子炉用核燃料要素に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear fuel element for a nuclear reactor, and more particularly to a nuclear fuel element for a nuclear reactor which has end plugs at both upper and lower ends of a cladding tube and stacks fuel pellets inside.
従来、原子炉用核燃料要素内の燃料ペレットの上端面位
置を非破壊的に検出するためには、強力な外部放射線（
ＸｌｆＭ、 ｒｍおよび中性子線）発生値ｆＩ１１ｔ
−用い、被覆管の外部から放射線を照射して、内部の燃
料ペレット積層部における放射線の減衰効果を利用する
透過試験法、および、燃料ペレット積層部における放射
線（Ｘ線、β線、ｒ線および中性子線］の強度分布測定
法などが知られている。Conventionally, in order to nondestructively detect the top surface position of fuel pellets in nuclear fuel elements for nuclear reactors, strong external radiation (
XlfM, rm and neutron beam) generation value fI11t
- A transmission test method in which radiation is irradiated from the outside of the cladding tube and utilizes the attenuation effect of radiation in the fuel pellet stack inside the cladding, and radiation (X-rays, β-rays, R-rays, A method for measuring the intensity distribution of neutron beams is known.
これらの方法は、いずれも高価な大型試験装置を必要と
するため、試験を実施するにあたって施設または場所に
よる制限を受け、また、比較的に時間を要し、ｂつ、熟
練度を要するなどの欠点があった。All of these methods require expensive large-scale testing equipment, are subject to facility or location restrictions, and are relatively time-consuming and require a high degree of skill. There were drawbacks.
本発明の目的は、上記欠点を除去し、被覆管内部の燃料
ペレット積層部の上端面位置を迅速かつ容易に検出でき
る構造の原子炉用核燃料要素全提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a nuclear fuel element for a nuclear reactor having a structure that allows the position of the upper end surface of the fuel pellet stack inside the cladding tube to be detected quickly and easily.
本発明は、被覆管の上下両端に端栓を有し、内部に燃料
ベレツ）１−積ノーシてなる原子炉用核燃料要素におい
て、前記燃料ペレットの最上端に、帯磁性または誘磁性
物質よりなる標識率が設けられていることｔ−特徴とす
るものである。The present invention provides a nuclear fuel element for a nuclear reactor, which has end plugs at both the upper and lower ends of a cladding tube, and has a fuel pellet inside (1-1). It is a feature that a labeling rate is provided.
以下、本発明〇一実施例を図面に基づいて説明する。図
は本発明の原子炉用核燃料要素の縦ＷＴ面図で、１．７
は端栓、２Ｆｉ帯磁性または誘磁性物質よりなる標識体
、３＃ｉ標識体２および燃料ベレット５を下方へ押さえ
つけている圧縮ばね、４はプレナム部、６は被覆管であ
る。Embodiments of the present invention will be described below based on the drawings. The figure is a longitudinal WT view of the nuclear fuel element for a nuclear reactor of the present invention, and is 1.7
Reference numerals denote an end plug, a marker made of 2Fi magnetized or dimagnetic material, a compression spring pressing down the 3#i marker 2 and the fuel pellet 5, 4 a plenum portion, and 6 a cladding tube.
この実施例の原子炉用核燃料費１ｇは、被覆管６の上下
両端に端栓１，７を有し、内部に燃料ペレット５￥ｒ槓
膚し、その最上端にａｍ体２を設け、その上部から圧縮
ばね３により標識体２および燃料べＶシト５會押さえつ
ける構造になっている。The cost of nuclear fuel for a nuclear reactor in this embodiment is 1 g, which has end plugs 1 and 7 at both the upper and lower ends of a cladding tube 6, 5 r of fuel pellets are shelled inside, and an am body 2 is provided at the uppermost end of the cladding tube 6. It has a structure in which the sign body 2 and the fuel container V seat 5 are pressed down from above by a compression spring 3.
この原子炉用核燃料要素内の燃料ペレット５の上端面位
＊を検出するには、帯磁した微粉粒を被覆管６の外周面
に塗布し、あるいは散布または接近させることにより、
内部の、帯磁性まｆｃ＃′ｉ誘磁性物質よりなる標識体
２と磁気反応させ、標識体２０位置を検出することによ
り、標識体２に接触する燃料べＶット５の上端面位置が
確認できる。In order to detect the upper end surface position* of the fuel pellets 5 in this nuclear fuel element for a nuclear reactor, magnetized fine powder particles are applied to the outer circumferential surface of the cladding tube 6, or sprinkled or brought close to it.
By causing a magnetic reaction with the marker 2 made of a magnetic or fc#'i dimagnetic material inside and detecting the position of the marker 20, the position of the upper end surface of the fuel bed 5 in contact with the marker 2 is determined. You can check it.
ま危、軽量で強い磁性をもつリング状の磁石を被覆管６
外に通し、標識体２の位置全通過する際の磁性抵抗から
燃料ペレット５の上端面位置を推定することができる。Dangerously, a ring-shaped magnet with lightweight and strong magnetism is coated with tube 6.
The upper end surface position of the fuel pellet 5 can be estimated from the magnetic resistance when passing through the entire position of the marker 2.
さらに、４１．Ｉｌｋ管６外に、電流を通じるコイルを
通過させコイル内に発生する電流の強さまたは乱れを検
出する等により燃料ペレット５の上端面位置を、被覆管
６を偵鍋することなく非破壊的に容易に検出できる。Furthermore, 41. By passing a current-carrying coil outside the Ilk tube 6 and detecting the strength or disturbance of the current generated inside the coil, the upper end surface position of the fuel pellet 5 can be determined non-destructively without disturbing the cladding tube 6. can be easily detected.
特に、リング状の磁石、および、コイルを用いる方法は
水中においても実施できる。In particular, methods using ring-shaped magnets and coils can be carried out underwater.
この構造の原子炉用核燃料要素ｔ、沸騰水型原子炉に用
いる場合には、プレナム部４の使用温度は約２８５Ｃ，
被覆管６のジルカロイ−２の線膨張係数は約６ ｘ １
０− ’ ｗｓ／ｗａ／Ｃ、標識体２の線膨張係数を約
１８ ｘ １０−” ｗｖ’ｗｊｃとすれば、標識体２
の仕上成型時の最大外径を被覆管６の内径よりもα０５
１以上小さくすることにより、標識体２は円滑に上下移
動できる。なお、標識体２がセラミックス成型体の場合
は、標識体２と最上端の燃料ペレットとの間に断熱板を
挿入することによって標識体２の破損を防止できる。When the reactor nuclear fuel element t of this structure is used in a boiling water reactor, the operating temperature of the plenum part 4 is approximately 285C,
The linear expansion coefficient of Zircaloy-2 of the cladding tube 6 is approximately 6 x 1
0-' ws/wa/C, and if the linear expansion coefficient of labeled body 2 is approximately 18 x 10-''wv'wjc, then labeled body 2
The maximum outer diameter at the time of finishing molding is α05 than the inner diameter of the cladding tube 6.
By reducing the size by 1 or more, the marker 2 can smoothly move up and down. In addition, when the marker 2 is a ceramic molded body, damage to the marker 2 can be prevented by inserting a heat insulating plate between the marker 2 and the uppermost fuel pellet.
以上説明したように、本発明によれば、原子炉用核燃料
要素内の燃料ペレットの上端面位置の検出を、その被覆
管外部から迅速かつ容易に行い得るというすぐれた実用
的効果を奏することができる。As explained above, according to the present invention, it is possible to achieve an excellent practical effect in that the position of the upper end surface of a fuel pellet in a nuclear fuel element for a nuclear reactor can be quickly and easily detected from outside the cladding tube. can.
図は本発明の一実施例の原子炉用核燃料要素の縦断面図
である。The figure is a longitudinal sectional view of a nuclear fuel element for a nuclear reactor according to an embodiment of the present invention.
Claims (1)
）１積層してなる原子炉用核燃料要素において、前記燃
料ペレットの最上端に、帯磁性またＦｉ鍔磁性物質より
なる標識体が設けられていることｔ−特徴とする原子炉
用核燃料要素。1. In a nuclear fuel element for a nuclear reactor, which has end plugs at both the upper and lower ends of a cladding tube and fuel pellets are stacked inside, a marker made of a magnetizable or Fi-flanked magnetic material is attached to the uppermost end of the fuel pellet. A nuclear fuel element for a nuclear reactor, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57022832A JPS58140675A (en) | 1982-02-17 | 1982-02-17 | Nuclear fuel element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57022832A JPS58140675A (en) | 1982-02-17 | 1982-02-17 | Nuclear fuel element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58140675A true JPS58140675A (en) | 1983-08-20 |
Family
ID=12093666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57022832A Pending JPS58140675A (en) | 1982-02-17 | 1982-02-17 | Nuclear fuel element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58140675A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7418282B2 (en) | 2000-12-29 | 2008-08-26 | Vertu Limited | Casing for portable communication device |
-
1982
- 1982-02-17 JP JP57022832A patent/JPS58140675A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7418282B2 (en) | 2000-12-29 | 2008-08-26 | Vertu Limited | Casing for portable communication device |
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