JPS6046485A - Fuel rod - Google Patents
Fuel rodInfo
- Publication number
- JPS6046485A JPS6046485A JP58154112A JP15411283A JPS6046485A JP S6046485 A JPS6046485 A JP S6046485A JP 58154112 A JP58154112 A JP 58154112A JP 15411283 A JP15411283 A JP 15411283A JP S6046485 A JPS6046485 A JP S6046485A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- hollow
- fuel rod
- pellets
- fuel pellets
- 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
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)
- Glass Compositions (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】
〔発明の技術分野〕
本発明はブランケット部とガスプレナム部とを改良した
燃料ｎＣ二関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a fuel nC with an improved blanket section and gas plenum section.
従来の中実燃料ベレットのみからなる燃料要素（二おい
て、その燃料棒の頂ｍ１＝は、燃料ベレットから出る気
体の核分裂生成物（以下Ｆ、Ｐガスと略称す）ζ二よっ
て過度（二内圧が上昇しないよう（ニプレナム室と称す
る空室が設けられている。このプ ２レナム室の容積は
、燃料有効長の１０〜１５％（二相歯する部分の空室容
積を必要とされている。In the conventional fuel element (2) consisting only of solid fuel pellets, the apex m1 of the fuel rod is excessive (2 In order to prevent the internal pressure from rising (an empty chamber called a plenum chamber is provided), the volume of this plenum chamber is 10 to 15% of the effective length of the fuel (the empty chamber volume of the two-phase toothed part is required). There is.
一方、燃料の有効利用をｄ［るために、最近は燃料有効
長の中央部を高濃縮度化し、その分だけ軸方向の両端を
低ａ縮している。しかし、このために燃料要素の軸方向
の中性子分布は、中央部（＝おいてピーキング係数が大
きくなる。これを改善するため（二、燃料要素を長くし
ないで、プレナム部を小さくして燃料有効長を大きくす
ること（二より、ピーキングを小さくすることができる
。しかし、これではプレナム部の谷状減少（二よって燃
料要素内のＦ、Ｐガス圧が高まる結果となる。On the other hand, in order to make more efficient use of fuel, recently the central part of the effective length of the fuel has been made highly enriched, and both ends in the axial direction have been reduced to that extent. However, for this reason, the neutron distribution in the axial direction of the fuel element is such that the peaking coefficient becomes large in the central part. By increasing the length (2), peaking can be reduced.However, this results in a trough-like reduction (2) in the plenum, thereby increasing the F, P gas pressure within the fuel element.
本発明の目的は、燃料有効長の確保とプレナム室の必要
容積を確保した燃料棒を提供するにある。An object of the present invention is to provide a fuel rod that secures the effective fuel length and the required volume of the plenum chamber.
本発明（二よる燃料棒は、密封された被８Ｌ管内−二積
み重ねて充填した複数の燃料ペレットの積重方向におけ
る中央部付近を比較的高い濃縮度の燃料ペレットで、溝
成し、その両端部付近を低濃ｍ度の中空燃料ペレットで
構成したことを特徴とするものである。The present invention (two fuel rods are constructed by forming a groove with relatively high enrichment fuel pellets near the center in the stacking direction of a plurality of fuel pellets filled in two stacks in a sealed 8L pipe, and It is characterized in that the vicinity of the fuel cell is made of low-concentration hollow fuel pellets.
以下本発明を図面に示す実施例（二ついて説明する。図
面（＝おいて本発明による燃料棒１は、被覆管２内に燃
料ペレット３．４を積み上げ、その頂部：ニガスプレナ
ム室５を形成し、これをプレナムスプリング６を介して
端栓７．８＋二より密封して構成されている。The present invention will be described below with reference to two embodiments shown in the drawings. In the drawings, a fuel rod 1 according to the present invention has fuel pellets 3.4 piled up in a cladding tube 2, the top of which forms a gas plenum chamber 5. , which are sealed by end plugs 7.8+2 via plenum springs 6.
本発明（：おいては、燃料要素１の軸方向の中央部付近
（二濃縮度の高い（３〜５Ｗチ濃縮度）燃料ペレット３
を積み上げ、その両端の燃料ペレット４．４は、天然ウ
ラン又は劣化ウランの中空ペレットを使用している。そ
して燃料ペレット４．４の中空＃９．９の径はペレット
外径の約５０％程度：：設定している。In the present invention, fuel pellets 3 near the axial center of the fuel element 1 (highly enriched (3 to 5W))
The fuel pellets 4.4 at both ends are hollow pellets of natural uranium or depleted uranium. The diameter of the hollow #9.9 of the fuel pellet 4.4 is set to about 50% of the pellet outer diameter.
この燃料棒１の燃料有効長の両端にある中空燃料ペレッ
ト４．４の部分をブランケット領域にすると、中央部の
燃料ペレット３，３の出力が大きくなってピーキング係
数が増大する。しかしピーキング係数の増大は、約１０
％位まで許容されるから、中空燃料ペレット４．４のブ
ランケット領域としては、中性子リークを少なくするの
（二十分な長さである燃料有効長の１０〜２０チ程度が
適当である。また中空燃料ペレット４．４の中空径９，
９は製造技術（二もよるが、中空径が余９大きいとプレ
スの歩留９が低下する点と、実質的なペレット密度の低
下（二よるプランケット燃料としての出力密度の不足の
点から、ペレット密度で約７５９！＋−二相歯「る約５
０ ｆｊ程屁がよい。When the hollow fuel pellets 4.4 at both ends of the fuel effective length of the fuel rod 1 are made into blanket regions, the output of the fuel pellets 3, 3 in the central portion increases and the peaking coefficient increases. However, the increase in peaking coefficient is approximately 10
%, so the appropriate blanket area for the hollow fuel pellet 4.4 is about 10 to 20 inches of the fuel effective length, which is enough to reduce neutron leakage. Hollow fuel pellet 4.4 hollow diameter 9,
9 depends on the manufacturing technology (2), but if the hollow diameter is too large, the press yield 9 will decrease, and the actual pellet density will decrease (2) due to the lack of power density as a plunket fuel. , the pellet density is about 759!
0 The fart is as good as fj.
このよう（二本発明（二よる燃料棒１（二おいては、積
重ねた燃料ペレットのブランケット部（二中空燃料ペレ
ット４．４を使用すること（二より、ブランケット効果
を保持するとともに、その中空部９゜９をガスブレナム
室５の一部とすることができる。In this way, the fuel rod 1 according to the present invention (2) uses a blanket section of stacked fuel pellets (2 hollow fuel pellets 4.4 (2) retains the blanket effect and the hollow The section 9.9 can be part of the gas blemish chamber 5.
また、中空燃料ペレット４．４は、低濃縮度のものを中
空にしているため、燃焼度の推移（二よるにωの減少過
程（二おいて、中空化による。核分裂物質の絶対量の減
少（二よる効果は小さい。さらにブランケット部からの
Ｆ、Ｐガス量は小さい、逆（＝ブランケット部を中央燃
料ペレット（二することでガスプレナム部５ｔ−小さく
して燃料要素の全長をその分だけ短くすることができる
。In addition, since hollow fuel pellets 4.4 are made hollow with low enrichment, the change in burnup (due to the decreasing process of ω (due to hollowing), the decrease in the absolute amount of fissile material (The effect due to 2 is small.Furthermore, the amount of F and P gases from the blanket part is small, and conversely (= the blanket part becomes the central fuel pellet (2) By making the gas plenum part 5t - smaller, the total length of the fuel element is shortened by that amount. can do.
例えば、燃料有効長３７０８朋の燃料要素は、約３７０
ｙａａのガスプレナムを有している。こ−で本発明Ｃ二
おいて燃料有効長の１３チを中央率２５％のペレットと
する。全長平均で３．９ｗ％ 濃縮度の燃料棒で、その
長さの１３チの部分を中空率２５チの天然ウランペレッ
ト４とすると、中央部の燃料ペレット３は、濃縮度４．
４ｗチとなる。そしてこの部分の出力は、約１０チ増大
することと、燃焼度が約２０％増加するととＣ二よ！Ｄ
Ｆ、Ｐガス放出量として約３０％増加する。これ４二対
し、中空燃料ペレット４．４は。For example, a fuel element with an effective fuel length of 3708
It has a yaa gas plenum. Therefore, in the present invention C2, 13 inches of the effective length of the fuel is made into pellets with a median ratio of 25%. If a fuel rod has an enrichment of 3.9 w% on average over its entire length, and the 13 inch portion of its length is a natural uranium pellet 4 with a hollowness ratio of 25 inch, the fuel pellet 3 in the center has an enrichment of 4.9 w%.
It becomes 4w chi. And the output of this part increases by about 10 inches, and the burnup increases by about 20%, so it's C2! D
The amount of F and P gases released will increase by approximately 30%. This is 42, whereas the hollow fuel pellet is 4.4.
出力の低下、燃焼度の低下、中空（＝よるＦ、Ｐ放出率
の低下の効果で、中実ペレットの場合の２０チ程度の放
出量となる。この結果、プレナム室５の長さは約６５ｍ
ｒａ短い３０５ｊ１ｍ１１ニすることができる。また燃
料棒１の両端が発熱の小さいブランケット部であるので
、テーマルウエアを省略することができる効果もめる。Due to the effects of lower power output, lower burnup, and lower F and P release rates due to hollow space, the amount released is approximately 20 cm compared to solid pellets.As a result, the length of the plenum chamber 5 is approximately 65m
Ra short 305j1m11 can be done. Furthermore, since both ends of the fuel rod 1 are blanket portions that generate less heat, there is also the advantage that theme wear can be omitted.
これらの効果Ｃ二よシもし燃料有効長を大きくするとす
れば、燃料有効長を燃料棒の全長を同じく二保って約８
０趨程度大きくすることができる。These effects C2: If the effective length of the fuel is increased, the effective length of the fuel should be approximately 8, keeping the overall length of the fuel rod the same.
It can be increased to around 0.
〔発明の効果〕
以上のよう（二本発明（二よれば、積重ねられた燃料ペ
レットの中央部を比較的高い濃縮度の燃料ペレットで構
成し、その両端部分を天然ウラン又は劣化ウランを用い
た低濃縮度の中空燃料ペレットで構成したこと４二より
、燃料の利用効率が向上され、かつ中空燃料ペレットの
中空部のガスプレナム部への利用Ｃ二よってＦ、Ｐガス
の収容領域を確保することができる。[Effects of the Invention] As described above, according to the present invention (2), the central part of the stacked fuel pellets is composed of relatively highly enriched fuel pellets, and both end parts are made of natural uranium or depleted uranium. By using hollow fuel pellets with low enrichment, fuel utilization efficiency is improved, and by using the hollow part of the hollow fuel pellets in the gas plenum part, a storage area for F and P gas is secured. I can do it.
図面は本発明（＝よる燃料棒の一実施例を示す断面図で
ある。
１・・・燃料棒 ２・・・被覆管
３・・・燃料ベレット ４・・・中空燃料ベレット５・
・・ガスプレナム室 ６・・・プレナムスプリング７．
８・・・端険 ９・・・中空部
（７３１７）代理人 弁理士 則 近 憲 佑（ほか１
名）図面の浄書（内容に変更な
手続補正書く方式〉
１．事件の表示
特願昭５８−１５４１１２号
２、発明の名称
燃料棒
３、補正をする者
事件との関係 特許出願人
（３０７）東京芝浦電気株式会社
４、代理人 〒１００
東京都千代田区内幸町１丁目１番６号
昭和５８年１１月２９日（発送日）The drawing is a sectional view showing an embodiment of a fuel rod according to the present invention. 1... Fuel rod 2... Cladding tube 3... Fuel pellet 4... Hollow fuel pellet 5.
...Gas plenum chamber 6...Plenum spring 7.
8...Hanken 9...Hollow Department (7317) Agent Patent Attorney Noriyuki Chika (and 1 others)
Name) Engraving of drawings (method of writing procedural amendments that change the content) 1. Indication of the case Japanese Patent Application No. 154112/1982 2. Name of the invention fuel rod 3. Person making the amendment Relationship to the case Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4, Agent Address: 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100 November 29, 1981 (Shipping date)
Claims (2)
複数の燃料ベレットを積重ねて充填した燃料棒におい−
〔、その積重ねられた燃料ベレットの積重方向（二おけ
る中央部付近全比較的高い濃縮度の燃料ぺＶツ）Ｑ！成
し、その両端部付近を天然ウランまたは劣化ウランの低
濃縮度の中空燃料ペレットで構成したことを特徴とする
燃料棒。(1) A fuel rod in which multiple fuel pellets are stacked and filled inside a sealed cladding tube, excluding the gas plenum chamber.
[, The stacking direction of the stacked fuel pellets (all fuel pellets with relatively high enrichment near the center of the two) Q! A fuel rod characterized in that the vicinity of both ends thereof are made up of hollow fuel pellets of low enrichment of natural uranium or depleted uranium.
室の容積との４計が燃料棒の有効部分の容積の１０−２
０チ（二なるように設定したことを特徴とする特許請求
の範囲第１項記載の燃料棒。(2) The total volume of the hollow part of the hollow combustible pellet and the volume of the gas plenum chamber is 10-2 of the volume of the effective part of the fuel rod.
The fuel rod according to claim 1, characterized in that the fuel rod is set to be 0 (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58154112A JPS6046485A (en) | 1983-08-25 | 1983-08-25 | Fuel rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58154112A JPS6046485A (en) | 1983-08-25 | 1983-08-25 | Fuel rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6046485A true JPS6046485A (en) | 1985-03-13 |
| JPH0344276B2 JPH0344276B2 (en) | 1991-07-05 |
Family
ID=15577184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58154112A Granted JPS6046485A (en) | 1983-08-25 | 1983-08-25 | Fuel rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6046485A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04304805A (en) * | 1991-04-03 | 1992-10-28 | Sliontec:Kk | Production of seeding sheet |
| JPH06342090A (en) * | 1993-05-28 | 1994-12-13 | Nuclear Fuel Ind Ltd | Fuel rod |
-
1983
- 1983-08-25 JP JP58154112A patent/JPS6046485A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04304805A (en) * | 1991-04-03 | 1992-10-28 | Sliontec:Kk | Production of seeding sheet |
| JPH06342090A (en) * | 1993-05-28 | 1994-12-13 | Nuclear Fuel Ind Ltd | Fuel rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0344276B2 (en) | 1991-07-05 |
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