JPH02176598A - Fuel rod for nuclear reactor - Google Patents
Fuel rod for nuclear reactorInfo
- Publication number
- JPH02176598A JPH02176598A JP63334580A JP33458088A JPH02176598A JP H02176598 A JPH02176598 A JP H02176598A JP 63334580 A JP63334580 A JP 63334580A JP 33458088 A JP33458088 A JP 33458088A JP H02176598 A JPH02176598 A JP H02176598A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- end plug
- fuel rod
- corrosion
- anticorrosive
- 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
- 239000000446 fuel Substances 0.000 title abstract description 11
- 230000007797 corrosion Effects 0.000 claims abstract description 36
- 238000005260 corrosion Methods 0.000 claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 31
- 239000000956 alloy Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000003758 nuclear fuel Substances 0.000 claims abstract description 5
- 238000005253 cladding Methods 0.000 claims description 18
- 238000003466 welding Methods 0.000 abstract description 15
- 229910001093 Zr alloy Inorganic materials 0.000 abstract description 8
- 238000005304 joining Methods 0.000 abstract description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract 1
- 239000001995 intermetallic alloy Substances 0.000 abstract 1
- 239000007769 metal material Substances 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は耐食性（溶接部を含む）を改良した原子炉用燃
料棒に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a nuclear reactor fuel rod with improved corrosion resistance (including welded parts).
（従来の技術）
近時、高燃焼度炉心になると、炉内滞在期間が長くなる
ので燃料被覆管の冷却水による腐食が問題となり、耐食
性を改良した被覆管の採用が進められ、外面の１０％程
度の肉厚のみ耐食性合金を使用しようとする手段が試み
られている。(Prior art) In recent years, as high burnup cores have been developed, corrosion of fuel cladding tubes due to cooling water has become a problem due to the longer stay in the reactor. Attempts have been made to use corrosion-resistant alloys only in the wall thickness of about 1.5%.
この耐食性合金はその性格上、耐食性改良に主眼がおか
れ、そのため強度は小さくてもよいこととなっているが
、このとき、問題は端栓溶接部である。Due to the nature of this corrosion-resistant alloy, the main focus is on improving corrosion resistance, and therefore the strength may be low, but the problem in this case is the end plug weld.
勿論、端栓自体は加わる応力が小さいので被覆管外側の
耐食性合金と同じ合金を使用することが可能であるが、
溶接には通常、第２図に示すように、電極（６）を回転
させながら電極（６）より発生するアーク（７）により
被覆管（１）、端栓（２）を溶融し、接合面（３）を溶
接する、いわゆるＴＩＧ溶接が用いられている。Of course, since the stress applied to the end plug itself is small, it is possible to use the same alloy as the corrosion-resistant alloy on the outside of the cladding.
Usually, as shown in Figure 2, welding involves rotating the electrode (6) and melting the cladding tube (1) and end plug (2) with an arc (7) generated from the electrode (6), thereby bonding the joint surface. (3), so-called TIG welding is used.
（発明が解決しようとする架台）
しかしながら、このようなＴＩＧ溶接によるときは全体
を溶かすため、溶接部が耐食性合金に止まらず、耐食性
合金と被覆管母材であるジルカロイ４との新合金または
金属間化合物となり、耐食性を劣化する。(Structure to be Solved by the Invention) However, when such TIG welding is used, the entire body is melted, so the welded part is not limited to a corrosion-resistant alloy, but a new alloy or metal of a corrosion-resistant alloy and Zircaloy 4, which is the base material of the cladding tube. It becomes an intermediate compound and deteriorates corrosion resistance.
本発明は叙上のような実状に鑑み、これに対し好適な溶
接手段を見出すことにより全体を溶かすことなく互いに
接している接合面同志を融合させ、もって上記耐食性の
劣化を阻止することを目的とするものである。In view of the above-mentioned actual situation, an object of the present invention is to find a suitable welding method to fuse the joint surfaces that are in contact with each other without melting the whole, thereby preventing the above-mentioned deterioration of corrosion resistance. That is.
（課題を解決するための手段）
即ち、上記目的に適合する本発明の特徴とするところは
、外側所要厚さのみ耐食性合金を用いた二層構造からな
る被覆管と、前記耐食性合金と同一材からなる端栓とを
その接合部において抵抗溶接手段を用いて溶融接合せし
めたことにある。(Means for Solving the Problems) That is, the features of the present invention that meet the above objectives include a cladding tube having a two-layer structure using a corrosion-resistant alloy only for the required thickness on the outside, and a cladding made of the same material as the corrosion-resistant alloy. The end plugs are fused and joined at their joints using resistance welding means.
ここで抵抗溶接は被覆管と端栓との間に電極により電流
を流し、接触面に発生する熱により両者金属を溶融接合
するものである。Here, resistance welding involves passing an electric current through an electrode between the cladding tube and the end plug, and melting and joining the two metals using the heat generated at the contact surface.
本発明者らの研究によれば、上記溶接部は全体を溶かす
ものではなく、互いに接している面同志が融合するだけ
の手段が耐食性保持のために望ましいとの知見を得てこ
のような溶接手段を見出すべく種々の試験を行った。そ
の結果、近時、注目されている固相溶接、即ち、双方の
接合面を加熱し、その塑性変形を利用して密着性を高め
る方法もあるが、設備的に不釣り合いであり、抵抗溶接
が最も望ましい接合面を作ることが判明した。According to the research of the present inventors, it was found that it is desirable to maintain corrosion resistance by not melting the entire welded part, but by simply fusing the surfaces that are in contact with each other. Various tests were conducted to find a solution. As a result, solid-phase welding, which has recently been attracting attention, is a method that heats both joint surfaces and uses the plastic deformation to improve adhesion, but it is unbalanced in terms of equipment, and resistance welding was found to create the most desirable bonding surface.
なお、溶融している時間は余り長すぎると、溶融金属が
混合することになるので、溶融時間はできるだけ短い方
が望ましい。Note that if the melting time is too long, the molten metals will mix, so it is desirable that the melting time be as short as possible.
（作用）
上記の如き溶接手段を用い接合することにより双方の接
合面に発生する加熱により溶融接合され、溶接部は実質
的に外側も耐食性合金となり、従来の如き全体の溶融に
より新合金または金属間化合物となることがなく、従っ
て、耐食性の劣化を招かず、所期の耐食性をもつ原子炉
用燃料棒を形成することが可能となる。(Function) By joining using the above-mentioned welding means, the heating generated on both joining surfaces will melt and join, and the welded part will become a corrosion-resistant alloy on the outside as well, and the new alloy or metal will be melted by melting the whole as in the conventional method. Therefore, it is possible to form a fuel rod for a nuclear reactor having the desired corrosion resistance without causing deterioration of corrosion resistance.
（実施例） 以下、添付図面と共に、本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
第１図は本発明燃料棒の作製に用いる溶接手段の概要を
示し、図において、（１）は被覆管、（２）は端栓、（
３）は両者の接合面であり、被覆管（１）は外側のみ耐
食性合金を用いた二層構造からなっており、端栓（２）
は上記の耐食性合金と同一材で作られていて、それぞれ
に電極（４）（５）が接触し、被覆管（１）と端栓（２
）の間に電圧（Ｅ）を印加した電極（４） （５）を介
して電流を流し、接触面に発生する熱により双方の金属
を溶融接合せしめている。FIG. 1 shows an outline of the welding means used to fabricate the fuel rod of the present invention. In the figure, (1) is a cladding tube, (2) is an end plug, (
3) is the joint surface between the two, the cladding tube (1) has a two-layer structure using a corrosion-resistant alloy only on the outside, and the end plug (2)
are made of the same material as the above-mentioned corrosion-resistant alloy, and the electrodes (4) and (5) are in contact with each other, and the cladding tube (1) and the end plug (2) are in contact with each other.
), a current is passed through the electrodes (4) and (5) to which a voltage (E) is applied, and the heat generated at the contact surface melts and joins both metals.
ここで、上記耐食性合金としては、例えば、（イ）すす
の含有量を低くしたジルカロイ４．（Ｄ）管製造工程で
の熱処理を改善して耐食性を高めたジルカロイ４．（ハ
）ニオブ（ＮＢ）入りジルコニウム合金などが挙げられ
る。なお、ジルカロイ４は従来より軽水炉燃料被覆管に
用いられている材料であることは周知の通りである。Here, as the above-mentioned corrosion-resistant alloy, for example, (a) Zircaloy 4 with a low soot content. (D) Zircaloy with enhanced corrosion resistance by improving heat treatment during the pipe manufacturing process 4. (c) Zirconium alloy containing niobium (NB) and the like can be mentioned. It is well known that Zircaloy 4 is a material conventionally used for light water reactor fuel cladding tubes.
次に上記各耐食性合金を用いて外面を覆ったジルカロイ
４被覆管と、上記合金と同一材で製作した端栓をそれぞ
れ抵抗溶接で接合した結果、該燃料棒は何れも溶接部の
外周も上記耐食性合金で保護された二層構造の状態が得
られており、新合金や金属間化合物は生ぜず、耐食性が
十分、保持されていた。Next, a Zircaloy 4 cladding tube whose outer surface was covered with each of the above corrosion-resistant alloys and an end plug made of the same material as the above alloy were joined by resistance welding. A two-layer structure protected by a corrosion-resistant alloy was obtained, no new alloys or intermetallic compounds were formed, and corrosion resistance was sufficiently maintained.
このことより本発明燃料棒は耐食性に改良がなされてい
ることが立証された。This proves that the fuel rod of the present invention has improved corrosion resistance.
（発明の効果）
本発明は以上のように外側のみ耐食性合金を用いた二層
構造の被覆管と、上記耐食性合金と同一材を用いた端栓
を抵抗溶接手段を用いて接合したことにより、従来のＴ
ＩＧ溶接の如・く全体が溶けることがな（、接合部の発
熱による溶融だけで溶接部の外周においても耐食性合金
で実質的に保護された状態が得られ、耐食性を改良した
被覆管を採用する場合においても何ら、従来のような耐
食性の劣化を招くことがなく、耐食性の改良された燃料
棒を得ることができる。(Effects of the Invention) As described above, the present invention has a two-layer cladding tube made of a corrosion-resistant alloy only on the outside, and an end plug made of the same material as the corrosion-resistant alloy, which are joined using resistance welding means. Conventional T
Unlike IG welding, the entire part does not melt (the outer periphery of the welded part is essentially protected by a corrosion-resistant alloy due to only melting due to heat generation at the joint), and a cladding tube with improved corrosion resistance is used. Even in this case, a fuel rod with improved corrosion resistance can be obtained without causing deterioration in corrosion resistance as in the conventional case.
本発明燃料棒は特に高燃焼度炉心に用い有効であるが、
勿論、燃料被覆管の冷却水による腐食が問題となるすべ
ての燃料棒の耐食性改良に効果を奏する。Although the fuel rods of the present invention are particularly effective for use in high burnup cores,
Of course, this is effective in improving the corrosion resistance of all fuel rods where corrosion of the fuel cladding due to cooling water is a problem.
【図面の簡単な説明】
第１図は本発明に係る燃料棒の被覆管と端栓との接合状
況を示す概要図、第２図は従前の接合状況を示す概要図
である。
（１）・・・被覆管、（２）・・・端栓。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing how the cladding tube and end plug of a fuel rod according to the present invention are joined, and FIG. 2 is a schematic diagram showing the conventional joining state. (1)...cladding tube, (2)...end plug.
Claims (1)
覆管と、前記耐食性合金と同一材からなる端栓を接合し
てなる原子炉用燃料棒であって、前記接合部が抵抗溶接
により接合されていることを特徴とする原子炉用燃料棒
。1. A nuclear reactor fuel rod consisting of a two-layered cladding tube made of a corrosion-resistant alloy of a required thickness on the outside and an end plug made of the same material as the corrosion-resistant alloy, the joint being resistance welded. A nuclear reactor fuel rod characterized by being joined by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334580A JPH02176598A (en) | 1988-12-28 | 1988-12-28 | Fuel rod for nuclear reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334580A JPH02176598A (en) | 1988-12-28 | 1988-12-28 | Fuel rod for nuclear reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02176598A true JPH02176598A (en) | 1990-07-09 |
Family
ID=18278991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63334580A Pending JPH02176598A (en) | 1988-12-28 | 1988-12-28 | Fuel rod for nuclear reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02176598A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0431274U (en) * | 1990-07-06 | 1992-03-13 | ||
| US5401933A (en) * | 1992-11-20 | 1995-03-28 | Mitsubishi Nuclear Fuel Co. | Method for welding of end plug of control rod |
| US5513230A (en) * | 1992-09-14 | 1996-04-30 | Siemens Aktiengesellschaft | Fuel rod for a nuclear reactor and welding apparatus for producing the fuel rod |
| US10410754B2 (en) | 2016-10-11 | 2019-09-10 | Bwxt Mpower, Inc. | Resistance pressure weld for nuclear reactor fuel rod tube end plug |
-
1988
- 1988-12-28 JP JP63334580A patent/JPH02176598A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0431274U (en) * | 1990-07-06 | 1992-03-13 | ||
| US5513230A (en) * | 1992-09-14 | 1996-04-30 | Siemens Aktiengesellschaft | Fuel rod for a nuclear reactor and welding apparatus for producing the fuel rod |
| US6104773A (en) * | 1992-09-14 | 2000-08-15 | Siemens Aktiengesellschaft | Fuel rod for a nuclear reactor |
| US5401933A (en) * | 1992-11-20 | 1995-03-28 | Mitsubishi Nuclear Fuel Co. | Method for welding of end plug of control rod |
| US10410754B2 (en) | 2016-10-11 | 2019-09-10 | Bwxt Mpower, Inc. | Resistance pressure weld for nuclear reactor fuel rod tube end plug |
| US11049623B2 (en) | 2016-10-11 | 2021-06-29 | Bwxt Mpower, Inc. | Resistance pressure weld for nuclear reactor fuel rod tube end plug |
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