JPS5928689A - Fuel rod - Google Patents
Fuel rodInfo
- Publication number
- JPS5928689A JPS5928689A JP57139576A JP13957682A JPS5928689A JP S5928689 A JPS5928689 A JP S5928689A JP 57139576 A JP57139576 A JP 57139576A JP 13957682 A JP13957682 A JP 13957682A JP S5928689 A JPS5928689 A JP S5928689A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- cladding tube
- fuel cladding
- surface roughness
- oxide film
- 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
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〕 本発明は軽水炉等の燃料棒（二関する。[Detailed description of the invention] [Technical field of invention] The present invention relates to fuel rods for light water reactors, etc.
一般にたとえば沸騰水形原子炉の燃料棒はジルコニウム
合金製の燃料被覆管内Ｃ二燃料ペレットを収容し、この
燃料被覆管の両端な端栓で密封して構成されている。そ
して、この燃料棒は複数本を結束して燃料粂合体を構成
し、この燃料集合体が炉心に装袖される。In general, for example, a fuel rod of a boiling water nuclear reactor is constructed by accommodating C bifuel pellets in a zirconium alloy fuel cladding tube and sealing the fuel cladding tube with end plugs at both ends. A plurality of these fuel rods are bundled together to form a fuel assembly, and this fuel assembly is loaded into the reactor core.
上記のような燃料棒はその表面が高温の冷却材（軽水）
に接触するため、との表面に酸化膜が形成される。この
酸化ｆｆ％はジルコニウム合金Ｃ二比較して熱伝導率が
小さいので、この酸化膜１″−よって内部の燃料ベレッ
トで発生した熱が冷却材まで伝達される際の熱抵抗が増
大し、燃料被覆管の温度が上昇する。また、このような
酸化膜の発生≦二よってその分だけ燃料被覆ｉの肉厚が
減少して機構的強度が低下する。よって、このような酸
化膜の発生《二よって、燃料被覆管の健全性《二悪影響
が生じる不具合があった。The surface of the fuel rods shown above is a high-temperature coolant (light water).
Since it comes into contact with , an oxide film is formed on its surface. Since this oxidized ff% has a lower thermal conductivity than zirconium alloy C2, this oxide film 1'' increases the thermal resistance when the heat generated in the internal fuel pellet is transferred to the coolant, and the The temperature of the cladding tube increases.In addition, since the formation of such an oxide film ≦2, the thickness of the fuel cladding i decreases by that amount, and the mechanical strength decreases.Therefore, the formation of such an oxide film << 2.Therefore, there was a problem that had an adverse effect on the integrity of the fuel cladding.
特《＝最近では核燃料の経済性のため、燃料の高燃焼化
が図られているが、このようκ二燃料の燃焼度を上げる
と燃料棒の使用期間が長くなる。Special {= Recently, efforts have been made to increase the burnup of nuclear fuel in order to make it more economical, but increasing the burnup of κ-2 fuel in this way increases the service life of the fuel rods.
このため、上記の酸化膜の発生、成長ｉ二よって燃料の
使用期間中に燃料被覆管が寿命（二連してしまう不具合
が生じ、燃料の使用期間がｆｌｉｌＪ限される不具合が
あった。For this reason, due to the generation and growth of the oxide film described above, the fuel cladding tube has a lifespan (double failure) during the period of use of the fuel, resulting in a problem that the period of use of the fuel is limited.
本発明Ｕ以上の事情にもとづいてなされたもので、その
目的とするところは燃料被覆管の酸化膜の発生を抑制し
、使用年数を延長することができる燃料棒を得ることに
ある。The present invention has been developed based on the above-mentioned circumstances, and its purpose is to suppress the formation of an oxide film on the fuel cladding tube and to obtain a fuel rod that can extend its service life.
本発明は燃料被覆管の表面のあらさを０．３μｍＲａ以
下としたものである。よって、このように燃料被覆管の
表面のあらさを０．３μｍ Ｒａ以下にすること（二よ
シその酸化膜の発生、成長が充分Ｃ抑制され、燃料棒の
使用年数を大幅に延長させることができるものである。In the present invention, the surface roughness of the fuel cladding tube is set to 0.3 μmRa or less. Therefore, by reducing the roughness of the surface of the fuel cladding tube to 0.3 μm Ra or less (secondarily, the generation and growth of the oxide film can be sufficiently suppressed and the service life of the fuel rod can be significantly extended). It is possible.
す、下水発明の一実施例を図を参照して説明する。図中
１は燃料被覆管であって、ジルコニウム合金で形成され
ている。そして、この燃料被覆管１内（−は二酸化ウラ
ンの粉末を短円柱状Ｃ二焼結した燃料ペレット２・・・
が収容されている。An embodiment of the sewage invention will be described with reference to the drawings. In the figure, 1 is a fuel cladding tube, which is made of a zirconium alloy. Inside this fuel cladding tube 1 (- indicates fuel pellets 2 made by sintering uranium dioxide powder into a short cylindrical shape C2...
is accommodated.
そして、この燃料被覆管１の上端、下端じはそれぞれ上
部端栓３および下部端栓４が密封溶接されている。An upper end plug 3 and a lower end plug 4 are hermetically welded to the upper and lower ends of the fuel cladding tube 1, respectively.
そＩ２て、この燃料被覆管１の少なくとも外表面はその
表面あらさが０．３μｍＲａ以下に仕上げられている。At least the outer surface of the fuel cladding tube 1 is finished to have a surface roughness of 0.3 μmRa or less.
なお、この一実施例のものは製造した燃料被覆管の表面
にサンドブラスト加工を施し、その表面あらさを０．３
μｍＲａ以下としたものである。In addition, in this example, the surface of the manufactured fuel cladding tube was sandblasted, and the surface roughness was reduced to 0.3.
It is set to be less than μmRa.
以上の如く構成された本発明の一実施例は、燃料被覆管
１の表面あらさが０．３μｍ Ｒａ以下（二形成されて
いるので、この表面の酸化膜の発生、成長が遅い。すな
わち、この燃料被覆管１（−使用されているジルコニウ
ム合金が高温、高圧の玲却拐中において酸化される原因
、過程は校雑であ）、燃料被覆管１の材質、冷却材の水
質等からこの酸化を確実に制御することは困離である。In one embodiment of the present invention configured as described above, the surface roughness of the fuel cladding tube 1 is 0.3 μm Ra or less (2), so the generation and growth of an oxide film on this surface is slow. This oxidation is caused by the fuel cladding tube 1 (-the reason why the zirconium alloy used is oxidized during high-temperature, high-pressure ablation; the process is sloppy), the material of the fuel cladding tube 1, the quality of the coolant water, etc. It is difficult to reliably control
とれ≦二対し、燃料被覆管の表面あらさと酸化速度の間
には明確な相関関係があシ、表面あらさが太き（なる程
酸化速度が大きくなシ、また表面あらさが小さくガる程
酸化速度が小となることか判明した。なお、第２図Ｃ二
はこの特性を示す。この第２図中の破線は従来のもの（
表面あらさが］０μｍＲａ）の酸化速度であシ、これに
対して実線は一実施例のもの（表面あらさ０．３μｍＲ
ａ）である。よって、このように燃料被覆管１０表面あ
らさを小さくすること屯−よシ酸化速度を確実Ｃ二制限
し、燃料被覆管の使用時間を延長することができる。そ
して、燃料被覆管ｌに酸化が生じるとその分だけ肉厚が
減少し、応力が増加する。したがって、酸化膜がある厚
さく二連すると肉厚の減少によシ燃料被覆管１の応力が
許容応力に達し、これ以上の使用が不能となる。On the other hand, there is a clear correlation between the surface roughness of the fuel cladding tube and the oxidation rate. It was found that the speed became small. Figure 2 C2 shows this characteristic. The broken line in this Figure 2 is the conventional one (
The oxidation rate was 0 μmRa), whereas the solid line shows the oxidation rate of one example (surface roughness 0.3 μmR).
a). Therefore, by reducing the surface roughness of the fuel cladding tube 10 in this way, it is possible to reliably limit the oxidation rate by C2 and extend the usage time of the fuel cladding tube. When oxidation occurs in the fuel cladding tube l, the wall thickness decreases by that amount, and stress increases. Therefore, when two oxide films are connected to a certain thickness, the stress in the fuel cladding tube 1 reaches the allowable stress due to the decrease in wall thickness, and further use becomes impossible.
そして、表面あらさｒによる酸化速度を０ （ｒ）、初
期の被覆管１の肉厚を１０、肉厚減少の許容限界なｔＪ
ｉｍｉｔ、時間なＴとすればｔｏ−〇（ｒ）・ＴＩ−＝
ｔｌｊｍＩｔ・・・・・・・・・（１）よって、許容さ
れる使用時間ＴＪｉｍｌｔ はとなる。なお第３図（
二は表面あらさと使用年数との関係を示す。そして、こ
の第３図から明らかなように燃料被覆管１０表面あらさ
が０．３μｍｌ（、ａ以下となると酸化速度がきわめて
小となシ、使用年数が大幅に延長されるものである。Then, the oxidation rate due to the surface roughness r is 0 (r), the initial wall thickness of the cladding tube 1 is 10, and the allowable limit for wall thickness reduction is tJ.
imit, time T, to-〇(r)・TI-=
tljmIt (1) Therefore, the allowable usage time TJimlt is as follows. In addition, Figure 3 (
2 shows the relationship between surface roughness and years of use. As is clear from FIG. 3, when the surface roughness of the fuel cladding tube 10 is less than 0.3 .mu.ml (a), the oxidation rate is extremely low and the service life is significantly extended.
上述の如く本発明は燃料被覆管の表面のあらさを０．３
μｍＲａ以下としたものである。よって、このよう（二
燃料被覆管の表面あらさな０．３μＩｎ几ａ以下Ｃ二す
ることによりその酸化膜の発生、成長が充分（二抑制さ
れ、燃料棒の使用年数を大幅（二延長させることができ
る等その効果は大である。As mentioned above, the present invention reduces the surface roughness of the fuel cladding tube to 0.3.
It is set to be less than μmRa. Therefore, by making the surface roughness of the fuel cladding tube less than 0.3 μIn a, the generation and growth of the oxide film can be sufficiently suppressed, and the service life of the fuel rod can be greatly extended. The effects are great, such as being able to do the following.
第１図は本発明の一実施例の縦断面図、第２図は表面あ
らさと酸化速度の関係を示す線図、第３図は燃料被覆管
の表鳳あらさと使用年数との関係を示す線図である。
１・・・燃料被覆管、２・・・燃料ペレット、３・・・
上部端栓 ４・・・下部端栓。
第１図
第２図
□碍閉
第３図
討客・Ｐ囚Ｉ受凋隼訳Figure 1 is a longitudinal cross-sectional view of an embodiment of the present invention, Figure 2 is a diagram showing the relationship between surface roughness and oxidation rate, and Figure 3 is a diagram showing the relationship between surface roughness of fuel cladding and years of use. It is a line diagram. 1...Fuel cladding tube, 2...Fuel pellets, 3...
Upper end plug 4...Lower end plug. Figure 1 Figure 2 □ Figure 3 Figure 3 Translated by Hayabusa, P Prisoner I
Claims (2)
、この燃料被覆管内（二収容された燃料ペレットとを備
え、上記燃料被覆管の表面あらさな０．３μｍ Ｒａ以
下にしたことを特徴とする燃料棒。(1) A fuel comprising a fuel cladding made of a zirconium alloy and fuel pellets housed within the fuel cladding, the surface roughness of the fuel cladding being 0.3 μm Ra or less. rod.
されている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 fuel rod according to claim (1), wherein the surface of the fuel cladding tube is sandblasted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57139576A JPS5928689A (en) | 1982-08-11 | 1982-08-11 | Fuel rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57139576A JPS5928689A (en) | 1982-08-11 | 1982-08-11 | Fuel rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5928689A true JPS5928689A (en) | 1984-02-15 |
Family
ID=15248472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57139576A Pending JPS5928689A (en) | 1982-08-11 | 1982-08-11 | Fuel rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5928689A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000037214A1 (en) * | 1998-12-09 | 2000-06-29 | Sandvik Ab (Publ) | Method for manufacture of tubes of a zirconium-based alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5636870A (en) * | 1979-08-27 | 1981-04-10 | Duracell Int | Chemical battery |
-
1982
- 1982-08-11 JP JP57139576A patent/JPS5928689A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5636870A (en) * | 1979-08-27 | 1981-04-10 | Duracell Int | Chemical battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000037214A1 (en) * | 1998-12-09 | 2000-06-29 | Sandvik Ab (Publ) | Method for manufacture of tubes of a zirconium-based alloy |
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