JPS62222196A - Manufacture of double pellet for nuclear fuel - Google Patents
Manufacture of double pellet for nuclear fuelInfo
- Publication number
- JPS62222196A JPS62222196A JP61065398A JP6539886A JPS62222196A JP S62222196 A JPS62222196 A JP S62222196A JP 61065398 A JP61065398 A JP 61065398A JP 6539886 A JP6539886 A JP 6539886A JP S62222196 A JPS62222196 A JP S62222196A
- Authority
- JP
- Japan
- Prior art keywords
- molded body
- ring
- nuclear fuel
- powder
- columnar
- 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.)
- Granted
Links
- 239000008188 pellet Substances 0.000 title claims description 25
- 239000003758 nuclear fuel Substances 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000843 powder Substances 0.000 claims description 31
- 238000000465 moulding Methods 0.000 claims description 9
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 description 17
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 16
- 239000000654 additive Substances 0.000 description 11
- 238000005245 sintering Methods 0.000 description 11
- 230000000996 additive effect Effects 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 6
- 230000008602 contraction Effects 0.000 description 3
- 229910000442 triuranium octoxide Inorganic materials 0.000 description 3
- IQWPWKFTJFECBS-UHFFFAOYSA-N O=[U](=O)O[U](=O)(=O)O[U](=O)=O Chemical compound O=[U](=O)O[U](=O)(=O)O[U](=O)=O IQWPWKFTJFECBS-UHFFFAOYSA-N 0.000 description 2
- WZECUPJJEIXUKY-UHFFFAOYSA-N [O-2].[O-2].[O-2].[U+6] Chemical compound [O-2].[O-2].[O-2].[U+6] WZECUPJJEIXUKY-UHFFFAOYSA-N 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- JCMLRUNDSXARRW-UHFFFAOYSA-N trioxouranium Chemical compound O=[U](=O)=O JCMLRUNDSXARRW-UHFFFAOYSA-N 0.000 description 2
- 229910000439 uranium oxide Inorganic materials 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- UTDLAEPMVCFGRJ-UHFFFAOYSA-N plutonium dihydrate Chemical compound O.O.[Pu] UTDLAEPMVCFGRJ-UHFFFAOYSA-N 0.000 description 1
- FLDALJIYKQCYHH-UHFFFAOYSA-N plutonium(IV) oxide Inorganic materials [O-2].[O-2].[Pu+4] FLDALJIYKQCYHH-UHFFFAOYSA-N 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 description 1
- 125000005289 uranyl group Chemical group 0.000 description 1
- 229910002007 uranyl nitrate Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- 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】
〔産業上の利用分野〕
この発明は、核燃料用二重ペレットの製造方法に関し、
更に詳しくは、コア部とリング部との間隙に隙間がなく
一体に密着してなる核燃料用二重ペレットの製造方法に
関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for producing double pellets for nuclear fuel,
More specifically, the present invention relates to a method for manufacturing a double pellet for nuclear fuel in which a core part and a ring part are tightly adhered to each other with no gap between them.
［従来の技術およびその問題点］
従来、核燃料に用いられる燃料ベレットとして、コア部
とその外側にあるリング部とからなる二重ペレットが知
られている。[Prior Art and its Problems] Conventionally, a double pellet consisting of a core part and a ring part outside the core part is known as a fuel pellet used for nuclear fuel.
この二重ペレットには、その製造法の違いによって、ノ
（コンパクト型とロウ（ＬＯＷ ） Ｉ型の２種類に大
別される。These double pellets are roughly divided into two types, LOW (compact type) and LOW (LOW) I type, depending on the manufacturing method.
Ｊ（コンパクト型二屯ペレ７トの製造は、柱形状のコア
部と中央部に空洞を有するリング部とを別々に成型し、
次いで、リング部の空ｌｊｉ部に前記コア部を嵌合し、
再プレスして一体化することにより行なわれている。J (Compact type Niton Pellet 7 is manufactured by separately molding a column-shaped core part and a ring part with a cavity in the center.
Next, the core part is fitted into the empty lji part of the ring part,
This is done by re-pressing and integrating.
またロウ■型二屯ペレットは、コア部とリング部とを別
々にプレス成型し、次いで焼結した後、リング部の空洞
部にコア部を嵌合するようにして両者を組合わせて製造
されている。In addition, wax type two-ton pellets are manufactured by press-molding the core part and the ring part separately, then sintering them, and then combining them by fitting the core part into the hollow part of the ring part. ing.
しかしながら、共コンパクト型及びロウＩ型二屯ペレッ
トにはそれぞれ問題点がある。However, the co-compact type and the Row I type two-ton pellets each have their own problems.
共コンパクト型二重ペレットでは、コア部とリング部の
ｔＡ造に２回のプレス成型を要し、さらに両者を嵌合し
た後再プレスを要するため、合計３回のプレス成型が必
要であり手間がかかると共にコストアップの要因となっ
ている。しかも、コア部とリング部の粉末特性の相違に
より両者の境界に隙間が生じたり、外側にクラックが生
ずる等の問題がある。With the co-compact type double pellet, press molding is required twice for the tA construction of the core part and ring part, and re-pressing is required after the two are fitted, so a total of three press moldings are required and time consuming. This is a factor that increases costs. Moreover, due to the difference in powder properties between the core part and the ring part, there are problems such as a gap being formed at the boundary between the two parts and cracks being formed on the outside.
またロウ■型二重ベレシトでは、コア部とリング部との
嵌合の際、リング部における空洞の内部寸法とコア部の
外部寸法とを一致させなければならず、その調整に手間
を要する。Furthermore, in the case of the wax type double beresh, when the core part and the ring part are fitted together, the internal dimensions of the cavity in the ring part and the external dimensions of the core part must be made to match, which requires time and effort.
［発明の目的］ この発明は前記事情に基いてなされたものである。[Purpose of the invention] This invention has been made based on the above circumstances.
すなわち、この発明の目的は、コア部とリング部との隙
間や外部表面にクラックがない良好な核燃料二重ペレッ
トを簡単かつ安価に製造することができる方法を提供す
ることである。That is, an object of the present invention is to provide a method for easily and inexpensively manufacturing good nuclear fuel double pellets without cracks in the gap between the core part and the ring part or in the outer surface.
［前記目的を達成するための手ＶＪｔ］前記目的を達成
するためのこの発明のｉ！１要は、酸化物粉末をプレス
成型して得た柱状成型体を。[Means for achieving the above object VJt] i! of this invention for achieving the above object! 1.The key point is a columnar molded body obtained by press molding oxide powder.
酸化物粉末をプレス成型して得られると共に１ｉｂリン
グ状成型体の内部空間に装入し、焼結することを特徴と
し、第１図に示すように、コア部２とこのコア部２を囲
繞するリング部３とに隙間がなく、リング部３の外周面
にクラックの発生のない、両名一体となった核燃料用二
重ペレット１を製造する方法である。It is characterized in that it is obtained by press-molding oxide powder, is charged into the internal space of a 1ib ring-shaped molded body, and is sintered, and as shown in FIG. This is a method for manufacturing a double pellet 1 for nuclear fuel in which there is no gap between the ring part 3 and the ring part 3, and no cracks are generated on the outer circumferential surface of the ring part 3.
ここで、前記柱状成型体およびリング状成型体を構成す
る物質は、基本的には、核燃料用酸化物であり、たとえ
ば、二酸化ウラン、二酸化プルトニウム、二酸化トリウ
ムなどが挙げられる。Here, the substance constituting the columnar molded body and the ring-shaped molded body is basically an oxide for nuclear fuel, and examples thereof include uranium dioxide, plutonium dioxide, thorium dioxide, and the like.
柱状成型体の形状は、通常円柱状であるが角柱状であっ
ても良い。The shape of the columnar molded body is usually cylindrical, but may be prismatic.
リング状成型体の形態は、前記柱状成型体の外形と同じ
形状の空洞部を有する形状であれば良く、通常、柱状成
型体が円柱状であれば、円筒形状の内部空間部を有する
と共に軸線に直交する断面がドーナツ状を７する円柱状
態である。The form of the ring-shaped molded body may be any shape as long as it has a cavity having the same shape as the outer shape of the columnar molded body. Usually, if the columnar molded body is cylindrical, it has a cylindrical internal space and an axis line. It has a cylindrical shape with a cross section perpendicular to 7 having a donut shape.
この発明のノ＾本的な原理は、ｉｉｊ記柱状成型体の収
縮率よりもリング状成型体の収縮率を大きく調製してお
き、リング状成型体の空洞部内に前記柱状成型体を嵌合
した状態で、焼結し、焼結の際のリング状成型体の収縮
により空洞部の内部寸法を低減させて、リング状成型体
の空洞部の内面と柱状成型体の外面とを密着させ、その
結果として一体化した核燃料二重ペレットを得ることで
ある。The basic principle of this invention is to adjust the contraction rate of the ring-shaped molded body to be larger than the contraction rate of the columnar molded body described in iii, and to fit the columnar molded body into the cavity of the ring-shaped molded body. In this state, the ring-shaped molded body is sintered, and the internal dimensions of the cavity are reduced by shrinkage of the ring-shaped molded body during sintering, so that the inner surface of the cavity of the ring-shaped molded body and the outer surface of the columnar molded body are brought into close contact with each other, The result is to obtain a unified nuclear fuel double pellet.
したがって、円柱状の収縮によりリング状成型体の内部
空間の内壁が柱状成型体の外壁を締付けることができる
ように、柱状成型体の外形寸法がリング状成型体の空洞
部の内部寸法とほぼ同じ程度か、少し小さ目に調製して
おくのが好ましい。Therefore, the external dimensions of the columnar molded body are approximately the same as the internal dimensions of the cavity of the ring-shaped molded body so that the inner wall of the internal space of the ring-shaped molded body can tighten the outer wall of the columnar molded body due to cylindrical contraction. It is preferable to prepare it in a slightly smaller size.
リング状成型体の収縮率が柱状成型体の収縮率よりも太
きくｍｌ！！する手段としては、たとえば、リング状成
型体と柱状成型体との密度を調製すれば良い。The shrinkage rate of the ring-shaped molded body is thicker than that of the columnar molded body! ! As a means for this, for example, the density of the ring-shaped molded body and the columnar molded body may be adjusted.
通常は、リング状成型体の密度を柱状成型体のそれより
も小さくする。Usually, the density of the ring-shaped molded body is made smaller than that of the columnar molded body.
密度の調製法としては、たとえば、二酸化ウランを核燃
料とする場合、二酸化ウラン粉末に密度調製用添加剤を
添加すること、密度調製用添加剤を添加しない二酸化ウ
ラン粉末のプレス圧を調製すること、などが挙げられる
。勿論、リング状成型体の収！ｉｉ率が柱状成型体の収
縮率よりも大きくすることができる他の種々の方法を採
用することができるのは言うまでもない。For example, when uranium dioxide is used as a nuclear fuel, density adjustment methods include adding a density adjustment additive to uranium dioxide powder, adjusting the pressing pressure of uranium dioxide powder without adding a density adjustment additive, Examples include. Of course, the ring-shaped molded body is included! It goes without saying that various other methods can be employed in which the ii ratio can be made larger than the shrinkage ratio of the columnar molded body.
密度調製用添加剤を添加する場合についてさらに詳述す
る。The case of adding the density adjusting additive will be explained in more detail.
前記密度Ｊｇ製出用添加剤しては、たとえば、残玉酸化
ウラン、屯ウラン酸アンモニウム、硝酸ウラニル、三酸
化ウラン、ポリビニルアルコールなどの有機化合物及び
Ｔｉ、Ｚｒなどの金属酸化物などが挙げられる。これら
の中でも好ましいのは、残玉酸化ウランである。Examples of the additives for producing density Jg include organic compounds such as residual uranium oxide, ammonium uranate, uranyl nitrate, uranium trioxide, and polyvinyl alcohol, and metal oxides such as Ti and Zr. . Among these, preferred is residual uranium oxide.
密度調製用添加剤は、柱状成型体に供する核燃料用酸化
物粉末に添加して調製しても良いし、また、リング状成
型体に供する核燃料用酸化物粉末に添加して密度を調製
しても良い。The additive for density adjustment may be prepared by adding it to the nuclear fuel oxide powder to be provided to the columnar molded body, or it may be added to the nuclear fuel oxide powder to be provided to the ring-shaped molded body to adjust the density. Also good.
この密度調製用添加剤の添加帛−は、以下に述へる核燃
料用酸化物粉末の粒径、プレス圧などにより一概に規定
することはできないが、ペレットの耐久性などを考慮す
ると、通常、Ｏ〜３０重φ％、好ましくは０〜２０重量
％の範囲内で添加することができる。The addition rate of this density-adjusting additive cannot be unconditionally determined depending on the particle size of the nuclear fuel oxide powder, press pressure, etc. described below, but when considering the durability of the pellet, it is usually It can be added in an amount of 0 to 30% by weight, preferably 0 to 20% by weight.
また、このような密度調製用添加剤を前記添加ＢＩＨ−
の範囲内で添加する場合、核燃料用酸化物たとえば二酸
化ウランの粉末の粒度、プレス圧なども、その密度決定
に影響があるであろう。Further, such a density adjusting additive may be added to the added BIH-
When adding within this range, the particle size of the nuclear fuel oxide, such as uranium dioxide powder, pressing pressure, etc. will also affect the determination of its density.
したがって、通常のサイズの核燃料ベレットたとえば二
酸化ウランペレットを製造する場合、二酸化ウランの粉
末の粒径は、通常、約１０ルｍ以下であり、好ましくは
約０．５＃Ｌｍ以下である。また、このような粒径の核
燃料用酸化物粉末をプレスして柱状成型体及びリング状
成型体をプレス成型する場合、密度調製用添加剤の種類
およびその添加量などにより一概に決定することができ
なし）が、プレス圧は、通常、０．５〜６ｔ／ｃｒｒｒ
’であり、好ましくは１〜５ｔ／ａｍ″である。Accordingly, when producing conventional sized nuclear fuel pellets, such as uranium dioxide pellets, the particle size of the uranium dioxide powder is typically less than about 10 Lm, preferably less than about 0.5 #Lm. In addition, when pressing oxide powder for nuclear fuel with such a particle size to press-form a columnar molded body or a ring-shaped molded body, it is not possible to make a general decision based on the type of additive for density adjustment and the amount added. (not possible), but the press pressure is usually 0.5-6t/crrr
', preferably 1 to 5 t/am''.
実際上は、二酸化ウランペレットの場合、二酸化ウラン
粉末に八三酸化ウラン粉末を各種の添加割合で添加し、
その密度を一々測定して検？線を、第２図に示すように
作成しておくのが便利である。なお、第２図に示す入玉
酸化つラン添加駿と密度との関係をＩＪ−える場合の二
酸化ウランの粒径は３２メツシュ節（ＪＩＳふるい：以
下間じ）を全開通過する程度であり、八三酸化ウランの
粒径は１００メツシユ箇を全品−通過する程度で、プレ
ス圧は２．５ｔ／Ｃｍ″である。In practice, in the case of uranium dioxide pellets, uranium octaoxide powder is added to uranium dioxide powder in various addition ratios,
Can you measure and check the density one by one? It is convenient to draw the lines as shown in Figure 2. In addition, when considering the relationship between the addition of uranium dioxide and the density shown in Figure 2, the particle size of uranium dioxide is such that it can fully pass through a 32-mesh sieve (JIS sieve: hereinafter referred to as ``meshji''). The particle size of the uranium octaoxide was such that it could pass through 100 meshes, and the pressing pressure was 2.5 t/Cm''.
さてこの発明の方法の手順の一例を次に説明する。Next, an example of the procedure of the method of the present invention will be explained.
先ず、核燃料粉末の特性テストを行なう、たとえば柱状
成型体に供する二酸１ヒウラン粉末を所定形状たとえば
方形にプレス成型し、次いで焼結する。そして、焼結前
後の寸法から収縮率を算出しておく、また、リング状成
型体に供する二酸化ウラン粉末についても同様にして収
縮率を算出しておく。First, a monohyuran diacid powder to be subjected to a characteristic test of nuclear fuel powder, for example a columnar molded body, is press-molded into a predetermined shape, for example a rectangle, and then sintered. Then, the shrinkage rate is calculated from the dimensions before and after sintering, and the shrinkage rate is calculated in the same manner for the uranium dioxide powder to be used in the ring-shaped molded body.
その結果、たとえばリング状成型体に供する粉末の方形
成型体の収縮率が、柱状成型体の収縮率よりも小さいの
であれば、柱状成型体に供する二酸化ウラン粉末に密度
調製用添加剤としてたとえば八三酸化ウランを添加して
、リング状成型体の収縮率が柱状成型体のそれよりも犬
きくなるように、２Ｉ製する。この場合、酸化物粉末の
粒度、密度、Ａ装用添加剤の粒度、添加量は前記範囲内
にある。As a result, for example, if the shrinkage rate of the powder to be used in the ring-shaped molded body is smaller than that of the columnar molded body, for example, a density-controlling additive may be added to the uranium dioxide powder to be used in the columnar molded body. 2I is manufactured by adding triuranium octoxide so that the shrinkage rate of the ring-shaped molded product is higher than that of the columnar molded product. In this case, the particle size and density of the oxide powder, and the particle size and amount of the A wear additive are within the above ranges.
その後、二酸化ウランの粉末をプレス成型してリング状
成型体を、密度５１製用添加剤入りの二酸化ウラン粉末
をプレス成型して円柱状成型体を得る。この場合、プレ
ス圧は、前記範囲内にある。Thereafter, uranium dioxide powder is press-molded to obtain a ring-shaped molded body, and uranium dioxide powder containing additives for density 51 is press-molded to obtain a cylindrical molded body. In this case, the press pressure is within the above range.
リング状成型体の中央空洞部内に、円柱状成型体を嵌合
し、焼結する。A cylindrical molded body is fitted into the central cavity of the ring-shaped molded body and sintered.
焼結温度は、核燃料物質の種類及び雰囲気等の条件によ
って異なるが、通常１３００〜１８００℃であり、好ま
しくは１５００〜１７５０℃である。The sintering temperature varies depending on the type of nuclear fuel material and conditions such as atmosphere, but is usually 1300 to 1800°C, preferably 1500 to 1750°C.
焼結前には、円柱状成型体の外周面とリング状成型体の
内部空洞部の内周面との間に隙間があるが、焼結によっ
て、リング状成型体が円柱状成型体よりも大きく収縮す
るので、前記隙間がなくなり、円柱状成型体とリング状
成型体とが一体に密１１成型されることとなる。Before sintering, there is a gap between the outer peripheral surface of the cylindrical molded body and the inner peripheral surface of the internal cavity of the ring-shaped molded body. Because of the large shrinkage, the gap disappears, and the cylindrical molded body and the ring-shaped molded body are integrally molded.
尚、リング状成型体の縦長さと柱状成型体の縦長さとが
相ａすると、焼結後に、端面部において凹陥部を生じた
り、凸部を生じたりする不都合があるので、そのような
ときには、端面部を平に研磨したり、あるいは、焼結後
に柱状成型体の縦長さとリング状成型体の縦長さとが一
致するように予めプレス成型体の縦長さを調製しておく
のが好ましい。In addition, if the vertical length of the ring-shaped molded body and the vertical length of the columnar molded body are in conflict with each other, there is a problem that a concave part or a convex part will be produced at the end face after sintering. It is preferable to polish the parts flat or to adjust the vertical length of the press molded body in advance so that the vertical length of the columnar molded body matches the vertical length of the ring-shaped molded body after sintering.
［実施例］
３２メツシユ簡を全：ＸＣ通過する粒度を有するＵ Ｏ
２粉末とＵ３Ｏ８粉末との混合粉末（Ｕ３０１１粉末：
２重Ｑ％）を２．５ｔ／ｃｍ’でプレス成型して密度５
−８ ｇ ／ ｃ ｍ’、外径１２．７０ ｍ ｍ、内
径８．３５ｍｍ、長さ１３．００ ｍｍのリング状成型
体を得た。[Example] U O having a particle size that passes through 32 meshes of all:XC
Mixed powder of 2 powder and U3O8 powder (U3011 powder:
Double Q%) was press-molded at 2.5t/cm' to obtain a density of 5.
A ring-shaped molded body having a weight of -8 g/cm', an outer diameter of 12.70 mm, an inner diameter of 8.35 mm, and a length of 13.00 mm was obtained.
一方、ＵＯ２粉末とＵ３０ａ粉末との混合粉末（Ｕ３０
ｓ粉末ニア屯驕％）を２．５ｔ／ａｍ’でプレス成型し
て密度５．８ｇ／ｃｒｎ’、直径６．３３ｍｍ、長さ１
３．００ ｍ口の円柱状成型体を得た。On the other hand, a mixed powder of UO2 powder and U30a powder (U30
Press molding of s powder (near tunnel) at 2.5 t/am', density 5.8 g/crn', diameter 6.33 mm, length 1
A cylindrical molded body with a diameter of 3.00 m was obtained.
次いで得られたリング状成型体と円柱状成型体を、円柱
状成型体が中央空洞部内に位置するようにして焼結ポー
ト内に直台二させて置き、温度１７００℃にて焼結して
密度１０．４ ｇ ／ ｃ ｒｒｒ’ 、直ＷＩ０．４
１ｍ ｍ 、長さ１０．５５ ｍ ｍの二重ペレットを
得た。Next, the obtained ring-shaped molded body and cylindrical molded body were placed directly in a sintering port with the cylindrical molded body located in the central cavity, and sintered at a temperature of 1700°C. Density 10.4 g/c rrr', direct WI0.4
A double pellet of 1 mm and a length of 10.55 mm was obtained.
この二重ペレットは、コア部がリング部より若干長かっ
たが、断面を研磨して調べたところ、コア部とリング部
との間に隙間はなく良好に密着しており、また、外表面
にクラックの発生もない良好なものであった。The core part of this double pellet was slightly longer than the ring part, but when the cross section was polished and examined, there was no gap between the core part and the ring part, and there was good adhesion. It was in good condition with no cracks.
［発明の効果１ 以上に詳述したように、本発明によると。[Effects of the invention 1 According to the invention, as detailed above.
（１） 焼結時、リング状成型体の収縮率が円柱状成
型体の収１ｉｌ−Ｐ、より大きいので、リング状成型体
がより大幅に収縮してコア部とリング部とに隙間がなく
て良好に密着し、かつ外表面にクチツクも生じない二重
ペレットを得ることができ、（２） また、共コンパ
クトヤニｍペレットの製造方法に較べてプレス成型が１
回少なくて済むため手間がかからずかつ安価であり、
（３） また、ロウエ型二東ペレットの製造方法に較
べて、コア部とリング部が焼結時に一体化されるので、
焼結したコア部と焼結したリング部とを嵌合する必要が
なく、その３１整のための手間が不安である、
等の優れた利点を有する核燃料用二重ペレットの製造方
法を提供することができる。(1) During sintering, the shrinkage rate of the ring-shaped molded body is greater than that of the cylindrical molded body, so the ring-shaped molded body shrinks more significantly and there is no gap between the core part and the ring part. (2) It is possible to obtain double pellets that adhere well to each other and do not cause any scratches on the outer surface.
(3) Also, compared to the manufacturing method of Lowe type Nito pellets, the core part and ring part are integrated during sintering, so
To provide a method for producing double pellets for nuclear fuel, which has excellent advantages such as not having to fit a sintered core part and a sintered ring part, and not having to worry about the trouble of adjusting them. be able to.
え
第１図はこの発明に用いられる核燃料用二酸化ウラン粉
末の粉末特性（焼結特性））示すグラフ、及び：ｔＳ！
図はこの発明によって得られる二重ペレットを示すｆ漸
斜視図である。
（１） ・・・二重ペレット、（２）・・・コア部、（
３）・・・リング部。
第１図
第２図
Ｕ３０８溌加率 （１量％）Figure 1 is a graph showing the powder characteristics (sintering characteristics) of the uranium dioxide powder for nuclear fuel used in this invention, and:tS!
The figure is a perspective view showing a double pellet obtained by the present invention. (1)...double pellet, (2)...core part, (
3)...Ring part. Figure 1 Figure 2 U308 acceleration rate (1%)
Claims (1)
酸化物粉末をプレス成型して得られると共に前記柱状成
型体の収縮率よりも大きな収縮率を有するリング状成型
体の内部空間に装入し、焼結することを特徴とする柱状
の核燃料用二重ペレットの製造方法。(1) A columnar molded body obtained by press molding oxide powder,
A columnar nuclear fuel secondary body obtained by press-molding oxide powder and charged into an internal space of a ring-shaped molded body having a shrinkage rate greater than that of the columnar molded body and sintered. Method of manufacturing heavy pellets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61065398A JPS62222196A (en) | 1986-03-24 | 1986-03-24 | Manufacture of double pellet for nuclear fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61065398A JPS62222196A (en) | 1986-03-24 | 1986-03-24 | Manufacture of double pellet for nuclear fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62222196A true JPS62222196A (en) | 1987-09-30 |
| JPH0481756B2 JPH0481756B2 (en) | 1992-12-24 |
Family
ID=13285869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61065398A Granted JPS62222196A (en) | 1986-03-24 | 1986-03-24 | Manufacture of double pellet for nuclear fuel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62222196A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653125A (en) * | 2016-12-28 | 2017-05-10 | 中核北方核燃料元件有限公司 | Manufacture method of UO2 fuel pellet, with central opening, through powder metallurgic method |
-
1986
- 1986-03-24 JP JP61065398A patent/JPS62222196A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653125A (en) * | 2016-12-28 | 2017-05-10 | 中核北方核燃料元件有限公司 | Manufacture method of UO2 fuel pellet, with central opening, through powder metallurgic method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0481756B2 (en) | 1992-12-24 |
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