JPH0990090A - Humidity removal method for nuclear fuel - Google Patents
Humidity removal method for nuclear fuelInfo
- Publication number
- JPH0990090A JPH0990090A JP7249381A JP24938195A JPH0990090A JP H0990090 A JPH0990090 A JP H0990090A JP 7249381 A JP7249381 A JP 7249381A JP 24938195 A JP24938195 A JP 24938195A JP H0990090 A JPH0990090 A JP H0990090A
- Authority
- JP
- Japan
- Prior art keywords
- fuel rod
- cartridge
- fuel
- end plug
- drying
- 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
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003758 nuclear fuel Substances 0.000 title claims description 6
- 239000000446 fuel Substances 0.000 claims abstract description 101
- 238000001035 drying Methods 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 29
- 239000008188 pellet Substances 0.000 claims abstract description 22
- 239000001307 helium Substances 0.000 claims abstract description 17
- 229910052734 helium Inorganic materials 0.000 claims abstract description 17
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000006467 substitution reaction Methods 0.000 abstract 2
- 238000005253 cladding Methods 0.000 description 5
- 238000005429 filling process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 150000004678 hydrides Chemical class 0.000 description 2
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005192 partition Methods 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
【０００１】[0001]
【発明の属する技術分野】本発明は、核燃料棒製造時に
おいて、被覆管内に燃料ペレットを充填した後端栓を溶
着する前に、上記被覆管内の乾燥を行う湿分除去方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing moisture during the production of nuclear fuel rods, in which the cladding tube is filled with fuel pellets and before the rear end plug is welded, the cladding tube is dried.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】一般
に、燃料棒内に湿分が残存していると、原子炉内でジル
コニウム合金である被覆管と反応して水素化物を形成す
ることがある。ところが、この水素化物は脆弱であるた
め、原子炉運転中に燃料棒の破損を引き起こす可能性が
ある。そのため、燃料棒内の湿分はペレット充填後に十
分に除去する必要がある。2. Description of the Related Art Generally, when moisture remains in a fuel rod, it sometimes reacts with a cladding tube made of a zirconium alloy in a nuclear reactor to form a hydride. . However, this hydride is fragile and can cause fuel rod failure during reactor operation. Therefore, it is necessary to sufficiently remove the moisture inside the fuel rod after the pellets are filled.
【０００３】従来、この湿分の除去には、オーブン炉が
使用されることが一般的であり、加熱・真空排気、ヘリ
ウムガス封入等を繰り返すことにより、湿分除去が行わ
れている。Conventionally, an oven furnace is generally used to remove the moisture, and the moisture is removed by repeating heating, evacuation and filling with helium gas.
【０００４】しかしながら、上述のようにオーブン炉を
使用した場合、バッチ炉形式であるため、燃料棒充填工
程や最終端栓溶接工程等の前後の工程と比較して時間が
かかりすぎ、どうしても燃料棒へのペレット充填工程や
最終端栓溶接工程の如き前後工程と不連続とせざるを得
ず、ラインを自動化するための妨げとなり、さらに昇温
降温に時間がかかりすぎる等の問題がある。However, when the oven furnace is used as described above, since it is a batch furnace type, it takes much time as compared with the steps before and after the fuel rod filling step, the final end plug welding step, etc. There is no choice but to discontinue with the preceding and following steps such as the pellet filling step and the final end plug welding step, which is an obstacle to automating the line, and there is a problem that it takes too much time to raise and lower the temperature.
【０００５】本発明は、このような点に鑑み、オーブン
形式のバッチ炉を燃料棒乾燥工程に使用した場合に問題
となる点を改善し、燃料棒へのペレット充填工程と燃料
棒乾燥工程と最終端栓溶接工程を一つの連続ラインとし
て生産効率を上げることができるようにした、核燃料棒
湿分除去方法を得ることを目的とする。In view of the above, the present invention has improved the problems that occur when an oven type batch furnace is used in the fuel rod drying process, and includes a pellet filling process for fuel rods and a fuel rod drying process. It is an object of the present invention to obtain a nuclear fuel rod moisture removal method capable of increasing the production efficiency by making the final end plug welding process into one continuous line.
【０００６】[0006]
【課題を解決するための手段】第１の発明は、燃料ペレ
ットが充填された複数本の燃料棒をカートリッジに装填
し、そのカートリッジを燃料棒乾燥装置内に搬入し、そ
の乾燥装置内において燃料棒内の雰囲気の強制的な給排
気を繰り返すことによって燃料棒内の湿分を除去するこ
とを特徴とする。A first aspect of the present invention is to load a plurality of fuel rods filled with fuel pellets into a cartridge, carry the cartridge into a fuel rod drying apparatus, and then carry out the fuel in the drying apparatus. The feature is that moisture in the fuel rod is removed by repeating forced supply and exhaust of the atmosphere in the rod.
【０００７】第２の発明は、燃料ペレットが充填された
複数本の燃料棒を装填したカートリッジを自動的に燃料
棒乾燥装置内に搬入し、そこで湿分が除去された燃料棒
を上記カートリッジとともに最終端栓溶接機側に搬出す
ることを特徴とする。In a second aspect of the invention, a cartridge loaded with a plurality of fuel rods filled with fuel pellets is automatically carried into a fuel rod drying device, and the fuel rod from which moisture has been removed is put together with the cartridge. The feature is that it is carried out to the final end plug welding machine side.
【０００８】また、第３の発明は、燃料棒乾燥装置にお
ける乾燥室内において、真空排気装置及びヘリウムガス
供給装置に連通するヘッダーを各燃料棒の開口端に装着
し、各燃料棒内の給排気を行うことを特徴とする。A third aspect of the present invention is to install a header communicating with a vacuum evacuation device and a helium gas supply device at the open end of each fuel rod in a drying chamber of the fuel rod drying device, and supply / exhaust gas in each fuel rod. It is characterized by performing.
【０００９】[0009]
【発明の実施の形態】以下、添付図面を参照して本発明
の実施の形態について説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１０】図１は燃料棒乾燥装置の概略構成を示す図
であり、その燃料棒乾燥装置１は、燃料棒内ガス置換室
１ａ、乾燥室１ｂ、置換室１ｃの２つの部屋に分割され
ており、燃料棒内ガス置換室１ａの入口部、各部屋間の
仕切壁部、及び置換室１ｃの出口部にはそれぞれ自動扉
２ａ、２ｂ、２ｃ、２ｄが設けられている。FIG. 1 is a diagram showing a schematic structure of a fuel rod drying apparatus. The fuel rod drying apparatus 1 is divided into two chambers, a gas replacement chamber 1a in a fuel rod, a drying chamber 1b and a replacement chamber 1c. Automatic doors 2a, 2b, 2c, 2d are provided at the inlet of the gas replacement chamber 1a in the fuel rod, the partition wall between the chambers, and the outlet of the replacement chamber 1c, respectively.
【００１１】一方、上記３つの部屋には、それぞれ導管
３を介してヘリウムガス供給装置４が接続され、さらに
導管５を介して真空排気装置６が接続されている。ま
た、第２の部屋である乾燥室１ｂ内には、後述するよう
にしてその乾燥室１ｂ内に搬入されて来た燃料棒の開口
端に着脱されるヘッダーが設けられており、そのヘッダ
ーにカートリッジ用ヘリウムガス供給装置７及びカート
リッジ用真空排気装置８がそれぞれ接続され、さらにそ
のカートリッジ用真空排気装置８には湿分チェック装置
９が接続されている。On the other hand, a helium gas supply device 4 is connected to each of the three chambers via a conduit 3, and a vacuum exhaust device 6 is further connected to the three chambers via a conduit 5. Further, in the drying chamber 1b, which is the second chamber, there is provided a header which is attached to and detached from the open end of the fuel rod carried into the drying chamber 1b as described later. A cartridge helium gas supply device 7 and a cartridge vacuum exhaust device 8 are connected to each other, and a moisture check device 9 is connected to the cartridge vacuum exhaust device 8.
【００１２】しかして、下部端栓が溶着された被覆管内
に所定の燃料ペレットが充填されると、その複数本例え
ば１０本づつの燃料棒がカートリッジ１０に装填され
る。このようにして燃料ペレットを内蔵し上部端栓側が
開口している燃料棒が装填されているカートリッジ１０
は、自動コンベア１１によって燃料棒乾燥装置１の方に
搬送され、上記カートリッジ１０が第１の部屋である燃
料棒内ガス置換室１ａの入口部に近づくと自動扉２ａが
開き、上記カートリッジ１０が上記燃料棒内ガス置換室
１ａ内に搬入される。そして、このカートリッジ１０が
上記燃料棒内ガス置換室１ａ内に搬入されると、真空・
排気装置６及びヘリウムガス供給装置４が作動し、上記
燃料棒内ガス置換室１ａ内が自動的に真空排気されその
後ヘリウムガスが封入される。そしてこれに伴なってカ
ートリッジ１０に装填されている燃料棒内のガスもヘリ
ウムガスに置換される。When a predetermined fuel pellet is filled in the cladding tube having the lower end plug welded, a plurality of fuel rods, for example, 10 fuel rods are loaded in the cartridge 10. In this way, the cartridge 10 in which the fuel rod is loaded and the fuel rod having the upper end plug side opened is loaded.
Is conveyed to the fuel rod drying device 1 by the automatic conveyor 11, and when the cartridge 10 approaches the inlet of the fuel rod gas replacement chamber 1a which is the first chamber, the automatic door 2a opens and the cartridge 10 It is carried into the gas replacement chamber 1a in the fuel rod. When the cartridge 10 is carried into the fuel rod gas replacement chamber 1a, a vacuum
The evacuation device 6 and the helium gas supply device 4 are activated, and the inside of the fuel rod gas replacement chamber 1a is automatically evacuated to evacuate the helium gas. Along with this, the gas in the fuel rod loaded in the cartridge 10 is also replaced with helium gas.
【００１３】上記燃料棒内ガス置換室１ａでヘリウムガ
スが封入された燃料棒がカートリッジ１０とともに自動
扉２ｂを通って第２の室である乾燥室１ｂ内に搬入され
ると、図２及び図３に示すように、カートリッジ１０に
装填されている各燃料棒１２の開口端に、カートリッジ
用真空排気装置８及びカートリッジ用ヘリウムガス供給
装置９が接続されているヘッダー１３が自動的に装着さ
れる。When the fuel rod in which the helium gas is filled in the fuel rod inside gas replacement chamber 1a is carried into the drying chamber 1b which is the second chamber through the automatic door 2b together with the cartridge 10, FIG. 2 and FIG. As shown in FIG. 3, the header 13 to which the vacuum evacuation device 8 for the cartridge and the helium gas supply device 9 for the cartridge are connected is automatically attached to the open end of each fuel rod 12 loaded in the cartridge 10. .
【００１４】その後、上記カートリッジ用真空排気装置
８及びカートリッジ用ヘリウムガス供給装置８が交互に
作動し、燃料棒の真空排気とヘリウム供給を繰り返し、
燃料棒１２内の湿分を除去する。なお、この場合供給さ
れるヘリウムガスは加熱したものを使用し、さらに真空
排気する際にはガスを湿分チェック装置９でサンプリン
グし湿分のチェックを行う。Thereafter, the cartridge vacuum evacuation device 8 and the cartridge helium gas supply device 8 are alternately operated, and the fuel rod vacuum evacuation and the helium supply are repeated,
Moisture in the fuel rod 12 is removed. In this case, the heated helium gas is used, and when the gas is further evacuated, the gas is sampled by the humidity check device 9 to check the humidity.
【００１５】このようにして、乾燥室１ｂで乾燥された
燃料棒１１は、その後カートリッジ１０とともに自動扉
２ｃを経て自動的に一旦燃料棒内ガス置換室１ｂと外気
との遮断を行う第３の部屋である置換室１ｃに搬入さ
れ、その後自動扉１ｄを経て次の工程である最終端栓溶
接工程側に搬送される。The fuel rod 11 thus dried in the drying chamber 1b is then automatically passed through the automatic door 2c together with the cartridge 10 to automatically shut off the fuel rod internal gas replacement chamber 1b from the outside air. It is carried into the replacement chamber 1c, which is a room, and then transferred to the final end plug welding process side, which is the next process, through the automatic door 1d.
【００１６】このように、燃料ペレットを充填した燃料
棒をカートリッジに装填して移動させることにより、燃
料ペレットの充填工程から最終端栓溶接工程まで自動化
ラインで接続することができる。As described above, by loading the fuel rod filled with the fuel pellets into the cartridge and moving the cartridge, it is possible to connect the fuel pellets from the filling process to the final end plug welding process by an automated line.
【００１７】図４は燃料棒乾燥装置１と燃料ペレット自
動充填装置１４とを自動コンベア１５で接続したものを
示す。したがって、燃料ペレット自動充填装置１４で燃
料ペレットが充填された燃料棒１２が所定本づつカート
リッジ１０に装填されて、上記自動コンベア１５で燃料
棒乾燥装置１内に搬入され、前述のように、充填工程に
続いて連続して乾燥工程を行うことができる。FIG. 4 shows the fuel rod dryer 1 and the fuel pellet automatic filling device 14 connected by an automatic conveyor 15. Therefore, the fuel rods 12 filled with the fuel pellets by the automatic fuel pellet filling device 14 are loaded into the cartridge 10 by a predetermined number, and are carried into the fuel rod drying device 1 by the automatic conveyor 15 as described above. A drying process can be continuously performed following the process.
【００１８】また、図５は上記燃料棒乾燥装置１を燃料
棒整列装置１６を介して最終端栓溶接装置１７に接続し
たものであり、上記燃料棒乾燥装置１で湿分が除去され
た燃料棒を燃料棒整列装置１６でカートリッジ１０から
取り出し整列させ、その燃料棒を順次最終端栓溶接装置
１７に供給し、上部端栓の溶接を行い、燃料棒を完成品
とすることができる。FIG. 5 shows the fuel rod drying device 1 connected to the final end plug welding device 17 through the fuel rod aligning device 16, and the fuel from which moisture has been removed by the fuel rod drying device 1 is connected. The rods can be taken out of the cartridge 10 by the fuel rod aligning device 16 and aligned, and the fuel rods can be sequentially supplied to the final end plug welding device 17 to weld the upper end plugs to complete the fuel rod.
【００１９】さらに、図６は燃料ペレット充填装置１
４、燃料棒乾燥装置１及び最終端栓溶接装置１７を順次
自動コンベア１５及び燃料棒整列装置１６を介して接続
し自動化ラインを構成したものである。したがって、こ
の場合燃料ペレットの充填工程から最終端栓溶接工程ま
で連続して自動的に作業を行わせることができる。Further, FIG. 6 shows a fuel pellet filling apparatus 1
4. The fuel rod drying device 1 and the final end plug welding device 17 are sequentially connected via the automatic conveyor 15 and the fuel rod alignment device 16 to form an automation line. Therefore, in this case, the work can be automatically performed continuously from the fuel pellet filling process to the final end plug welding process.
【００２０】[0020]
【発明の効果】以上説明したように、本発明は被覆管内
に燃料ペレットを充填した状態のままの燃料棒を所定数
毎にカートリッジに装填し、そのカートリッジを燃料棒
乾燥装置内に搬入し、その乾燥装置内において燃料棒内
の雰囲気の強制的な給排気を繰り返して燃料棒内の湿分
を除去するようにしたもで、燃料棒乾燥装置における前
後の段取り作業が不必要となり、また乾燥時間も短時間
で終了することができ、前後の燃料ペレット充填工程及
び最終端栓溶接工程とともに自動ラインに接続すること
ができ、燃料棒製造を一連のラインで行うことができ
て、その自動化を達成することができる。As described above, according to the present invention, a predetermined number of fuel rods, each of which is filled with fuel pellets in a cladding tube, are loaded into a cartridge, and the cartridge is loaded into a fuel rod dryer. Since the atmosphere inside the fuel rods is repeatedly forcedly supplied and exhausted in the drying device to remove the moisture inside the fuel rods, the setup work before and after the fuel rod drying device is unnecessary, and the drying operation is also unnecessary. It can be completed in a short time, can be connected to an automatic line together with the front and rear fuel pellet filling process and final end plug welding process, and fuel rod manufacturing can be performed in a series of lines, and its automation Can be achieved.
【図１】本発明における燃料棒乾燥装置の概略構成を示
す図。FIG. 1 is a diagram showing a schematic configuration of a fuel rod drying apparatus according to the present invention.
【図２】乾燥室内において各燃料棒をカートリッジ用真
空排気装置等に接続した状態を示す説明図。FIG. 2 is an explanatory view showing a state where each fuel rod is connected to a cartridge vacuum exhaust device or the like in a drying chamber.
【図３】燃料棒の開口端と上記真空排気装置等の接続状
態を示す拡大説明図。FIG. 3 is an enlarged explanatory view showing a connection state of an open end of a fuel rod and the vacuum exhaust device.
【図４】燃料棒乾燥装置と燃料ペレット充填装置とを自
動コンベアで接続した状態を示す図。FIG. 4 is a view showing a state in which a fuel rod drying device and a fuel pellet filling device are connected by an automatic conveyor.
【図５】燃料棒乾燥装置と最終端栓溶接装置とを一つの
ラインに接続した状態を示す図。FIG. 5 is a view showing a state in which a fuel rod drying device and a final end plug welding device are connected to one line.
【図６】燃料棒乾燥装置を前後の作業工程と一つのライ
ンに接続した状態を示す図。FIG. 6 is a view showing a state in which a fuel rod drying device is connected to a front and rear working process and one line.
１ 燃料棒乾燥装置 １ｂ 乾燥室 ２ａ、２ｂ、２ｃ、２ｄ 自動扉 ４ ヘリウムガス供給装置 ６ 真空排気装置 ７ カートリッジ用ヘリウムガス供給装置 ８ カートリッジ用真空排気装置 ９ 湿分チェック装置 １０ カートリッジ １２ 燃料棒 １３ ヘッダー １４ 燃料ペレット自動充填装置 １５ 自動コンベア １６ 燃料棒整列装置 １７ 最終端栓溶接装置 1 Fuel Rod Drying Device 1b Drying Chamber 2a, 2b, 2c, 2d Automatic Door 4 Helium Gas Supply Device 6 Vacuum Evacuation Device 7 Helium Gas Supply Device for Cartridge 8 Vacuum Evacuation Device for Cartridge 9 Moisture Check Device 10 Cartridge 12 Fuel Rod 13 Header 14 Automatic fuel pellet filling device 15 Automatic conveyor 16 Fuel rod alignment device 17 Final end plug welding device
Claims (3)
をカートリッジに装填し、そのカートリッジを燃料棒乾
燥装置内に搬入し、その乾燥装置内において燃料棒内の
雰囲気の強制的な給排気を繰り返すことによって燃料棒
内の湿分を除去することを特徴とする、核燃料棒湿分除
去方法。1. A predetermined number of fuel rods filled with fuel pellets are loaded into a cartridge, the cartridge is loaded into a fuel rod dryer, and the atmosphere in the fuel rod is forcibly supplied and exhausted in the dryer. A method for removing moisture from a nuclear fuel rod, characterized in that the moisture inside the fuel rod is removed by repeating.
を装填したカートリッジを自動的に燃料棒乾燥装置内に
搬入し、そこで湿分が除去された燃料棒を上記カートリ
ッジとともに最終端栓溶接機側に搬出することを特徴と
する、請求項１記載の核燃料棒湿分除去方法。2. A cartridge loaded with a predetermined number of fuel rods filled with fuel pellets is automatically carried into a fuel rod drying device, and the fuel rod from which moisture has been removed therein is welded to the end plug together with the cartridge. The nuclear fuel rod moisture removal method according to claim 1, wherein the method is carried out to the machine side.
て、真空排気装置及びヘリウムガス供給装置に連通する
ヘッダーを各燃料棒の開口端に装着し、各燃料棒内の給
排気を行うことを特徴とする、請求項１記載の核燃料棒
湿分除去方法。3. A header for communicating with a vacuum exhaust device and a helium gas supply device is attached to an opening end of each fuel rod in a drying chamber of the fuel rod drying device to supply and exhaust air in each fuel rod. The method for removing moisture from nuclear fuel rods according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7249381A JPH0990090A (en) | 1995-09-27 | 1995-09-27 | Humidity removal method for nuclear fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7249381A JPH0990090A (en) | 1995-09-27 | 1995-09-27 | Humidity removal method for nuclear fuel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0990090A true JPH0990090A (en) | 1997-04-04 |
Family
ID=17192172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7249381A Pending JPH0990090A (en) | 1995-09-27 | 1995-09-27 | Humidity removal method for nuclear fuel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0990090A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8225526B2 (en) * | 2003-11-15 | 2012-07-24 | Instrotek, Inc. | Device and methods for rapid drying of porous materials |
-
1995
- 1995-09-27 JP JP7249381A patent/JPH0990090A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8225526B2 (en) * | 2003-11-15 | 2012-07-24 | Instrotek, Inc. | Device and methods for rapid drying of porous materials |
| US8826564B2 (en) | 2003-11-15 | 2014-09-09 | Instrotek, Inc. | Device and methods for rapid drying of porous materials |
| US9702626B2 (en) | 2003-11-15 | 2017-07-11 | Instrotek, Inc. | Device and methods for rapid drying of porous materials |
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