JPS598237Y2 - Spent nuclear fuel transport container - Google Patents
Spent nuclear fuel transport containerInfo
- Publication number
- JPS598237Y2 JPS598237Y2 JP1978171554U JP17155478U JPS598237Y2 JP S598237 Y2 JPS598237 Y2 JP S598237Y2 JP 1978171554 U JP1978171554 U JP 1978171554U JP 17155478 U JP17155478 U JP 17155478U JP S598237 Y2 JPS598237 Y2 JP S598237Y2
- Authority
- JP
- Japan
- Prior art keywords
- transport container
- nuclear fuel
- heat
- spent nuclear
- fins
- 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.)
- Expired
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
- Butt Welding And Welding Of Specific Article (AREA)
Description
【考案の詳細な説明】
本考案は、使用済核燃料のように、熱を発生し続ける放
射性物質を輸送するための容器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a container for transporting radioactive materials that continuously generate heat, such as spent nuclear fuel.
使用済核燃料輸送容器（以下単に輸送容器という。Spent nuclear fuel transport container (hereinafter simply referred to as transport container).
）は、主として原子力発電所で所定の燃焼を終えた核燃
料（以下単に燃料という。) is primarily nuclear fuel (hereinafter simply referred to as fuel) that has been burned in a prescribed manner at a nuclear power plant.
）を再処理工場に輸送するために使用されるものである
。) is used to transport waste to reprocessing plants.
燃料は通常発電所の貯蔵プールで数ケ月間冷却されたの
ちに輸送されるが、それでも大きな放射能を有すると共
に崩壊熱を発生しつづけている。The fuel is usually cooled for several months in storage pools at power plants before being transported, but it is still highly radioactive and continues to generate decay heat.
したがってこれを収納する輸送容器は充分な放射線遮蔽
能力および放熱能力が必要である。Therefore, the transport container that houses it must have sufficient radiation shielding and heat dissipation capabilities.
故に輸送容器は鉛その他の放射線遮蔽材を有すると共に
その外面に放熱のためのフィンを有するのが通常となっ
ている。Therefore, it is common for transport containers to have lead or other radiation shielding materials and fins on their outer surfaces for heat dissipation.
他方輸送容器は、輸送中火炎事故にあっても安全である
ことがその性質上要求されているが、このためには高温
に対して内部の遮蔽材、燃料などを保護する熱遮蔽能力
が必要である。On the other hand, transport containers are required to be safe even in the event of a fire accident during transport, but for this purpose they must have thermal shielding ability to protect internal shielding materials, fuel, etc. from high temperatures. It is.
即ち輸送容器は通常時と事故時において、それぞれ放熱
能力と熱遮蔽能力という相反する性能を要求されるとい
う宿命にある。In other words, transport containers are required to have contradictory performances, namely heat dissipation ability and heat shielding ability, both in normal times and in the event of an accident.
この為にはフィンを取付けた外殻の内側に熱保護層を設
け、これにある種の物質を充填し、その物質が通常温度
にあっては良好な熱伝導性を有するが、火災時の高温に
さらされると熱の不良導体となるという特性を利用して
上述の相反する要求を満足させる対策などが従来提案さ
れている。For this purpose, a thermal protection layer is provided inside the outer shell with the fins, which is filled with a certain material that has good thermal conductivity at normal temperatures, but which in the event of a fire Conventionally, countermeasures have been proposed to satisfy the above-mentioned contradictory requirements by utilizing the property that when exposed to high temperatures, the material becomes a poor conductor of heat.
本考案は、前記のような従来の熱保護層を設けることな
く、この相矛盾する二つの要求を満足させる輸送容器を
提供することを目的としてなされたものである。The present invention has been made with the object of providing a transportation container that satisfies these two contradictory requirements without providing the conventional heat protection layer as described above.
以下、本考案を図示の実施例に基づいて説明する。Hereinafter, the present invention will be explained based on illustrated embodiments.
第１図は、輸送容器の側面図、第２図はその横断面図で
ある。FIG. 1 is a side view of the transport container, and FIG. 2 is a cross-sectional view thereof.
図において容器本体１は、鋼製の外殻２、内殼３の間に
、鉛などの稠密な材料よりなるガンマ線遮蔽層４および
水素含有材料よりなる中性子遮蔽層５を有し、且つ外殻
２の外面に冷却フイン６が取りつけられている。In the figure, a container body 1 has a gamma ray shielding layer 4 made of a dense material such as lead and a neutron shielding layer 5 made of a hydrogen-containing material between an outer shell 2 and an inner shell 3 made of steel, and an outer shell 2 and an inner shell 3. Cooling fins 6 are attached to the outer surface of 2.
７は取外し可能な蓋、８は燃料を収納するキャビテイを
示す。7 is a removable lid, and 8 is a cavity for storing fuel.
該円環状のフイン６は熱伝導性の良好な材料で作られる
ことが望ましいが、それぞれ数片（図では３片）セグメ
ント６ａ，６ｂ，６Ｃに分割されており、互に接手９で
接着されている。The annular fin 6 is preferably made of a material with good thermal conductivity, and is divided into several pieces (three pieces in the figure) of segments 6a, 6b, and 6C, which are glued together with joints 9. ing.
第３図は、該フィン６の断面を示すものであって、フイ
ン６は本体外殼２に低融点金属あるいは合金１０により
、又は介して取付けられている。FIG. 3 shows a cross section of the fin 6, which is attached to the main body shell 2 with or through a low melting point metal or alloy 10.
前述のフイン６の接手部９も同様に低融点金属または合
金により溶接されている。The joint portion 9 of the fin 6 described above is similarly welded with a low melting point metal or alloy.
この低融点金属または合金としては、この輸送容器のフ
イン６の通常輸送時および火災事故時における温度には
相当の差があるので前者の温度にあっては充分な強度を
有し、後者の温度にあっては融解するような銀ろう（Ｊ
ＩＳＺ ３２６１）が用いられているが、りん銅ろう（
ＪＩＳＺ ３２６４）等でもよい。Since there is a considerable difference in the temperature of the fins 6 of this transport container during normal transportation and during a fire accident, the low melting point metal or alloy has sufficient strength at the former temperature, and has sufficient strength at the latter temperature. Silver wax that melts (J
ISZ 3261) is used, but phosphorous wax (ISZ 3261) is used.
JISZ 3264) etc. may be used.
勿論、フイン６の材質、外殼２の材質その他の制約条件
に応じて、適当な融点を有する軟ろう、硬ろう等が使用
できる。Of course, depending on the material of the fins 6, the material of the shell 2, and other constraints, soft solder, hard solder, or the like having an appropriate melting point can be used.
前記した構戊を有する本実施例において、キャビテイ８
内に収納された燃料の放射するガンマ線は、遮蔽層４に
よって遮断され、又中性子は遮蔽層５によって遮断され
、容器本体１の外側の放射能レベルは許容値以下に保た
れる。In this embodiment having the structure described above, the cavity 8
Gamma rays emitted by the fuel stored inside are blocked by the shielding layer 4, and neutrons are blocked by the shielding layer 5, so that the radioactivity level outside the container body 1 is kept below a permissible value.
更に正常時は燃料の発生する熱例えば崩壊熱は、内殻３
、遮蔽層４，５及び外殻２を順次経てフイン６に伝達さ
れ、ここから外気に伝えられる。Furthermore, under normal conditions, the heat generated by the fuel, such as decay heat, is absorbed by the inner shell 3.
, the shielding layers 4 and 5, and the outer shell 2, and are transmitted to the fins 6, from where they are transmitted to the outside air.
フイン６の放熱面積、材質等は 収納される燃料の量や
そ＼
の発生熱量、又その他の構造に応じて適宜選択されてお
り、フイン６は外気に適度に冷却されて、低融点金属あ
るいは合金１０の温度は融点以下に保たれている。The heat dissipation area, material, etc. of the fins 6 are appropriately selected depending on the amount of fuel stored, the amount of heat generated, and other structures. The temperature of alloy 10 is maintained below its melting point.
次に、輸送途上において外部火災に遭遇したときはもと
もと冷却フイン６は、容器と外部との間の熱伝導性がよ
い様に構威されているので、通常時と逆に働いて、冷却
フイン６は、外部の熱をどんどん吸収してその温度は急
上昇し、火災発生後間もな＜８００℃に近い温度に達し
ます。Next, when an external fire occurs during transportation, the cooling fins 6 are designed to have good thermal conductivity between the container and the outside, so the cooling fins 6 work in the opposite direction to the normal situation, and the cooling fins 6 6 absorbs more and more heat from the outside, and its temperature rises rapidly, reaching temperatures close to <800℃ shortly after a fire breaks out.
従って低融点金属あるいは合金１０は、その融点を超え
て融解し、冷却フイン６は、外殻２から脱落し、受熱面
積が大巾に減少し、火災による熱の容器本体１内への伝
達が阻止される。Therefore, the low melting point metal or alloy 10 melts beyond its melting point, the cooling fins 6 fall off from the outer shell 2, the heat receiving area is greatly reduced, and the heat from the fire is not transferred into the container body 1. blocked.
前記した構戒及び作用を有する本実施例によれば、通常
の輸送時にあっては、フイン６の接着強度は充分にあり
且つその接着部において熱の伝導を妨げられることもな
いのでフイン６はその放熱性能を発揮し、所要の冷却能
力が得られて本体１内を所要温度以下に保ち、又火災事
故に遭遇したときはフイン６に逆に受熱部材として働き
、その温度は上昇して低融点金属あるいは合金１０が融
解するので、フイン６は外殻２から分離脱落するため、
輸送容器の受熱面積は急激かつ大巾に減少し、熱の浸入
量を低下させ、本体１の内部の温度上昇を押えることが
できる。According to this embodiment having the above-mentioned structure and function, during normal transportation, the fins 6 have sufficient adhesive strength and the conduction of heat is not hindered at the bonded portion, so that the fins 6 are It exhibits its heat dissipation performance, obtains the required cooling capacity, and keeps the inside of the main body 1 below the required temperature.In addition, in the event of a fire accident, the fins 6 act as a heat receiving member, and the temperature rises to lower the temperature. As the melting point metal or alloy 10 melts, the fins 6 separate from the outer shell 2 and fall off.
The heat receiving area of the transport container is rapidly and drastically reduced, the amount of heat infiltration is reduced, and the temperature rise inside the main body 1 can be suppressed.
尚前記実施例は、外殻２の周方向に冷却フィンを有する
ものであったが、軸方向に取付けられた場合も同様の効
果を奏する。In the above embodiment, the cooling fins were provided in the circumferential direction of the outer shell 2, but the same effect can be obtained even if the cooling fins are attached in the axial direction.
第１図は、本考案の実施例を示す側面図、第２図は、前
記実施例の横断面図、第３図は、第１図の部分拡大断面
図である。
１・・・・・・容器本体、２・・・・・・外殻、３・・
・・・・内殻、４・・・・・・ガンマ線遮蔽層、５・・
・・・・中性子遮蔽層、６・・・・・・冷却フィン、８
・・・・・・キャビテイ、１０・・・・・・低融点金属
あるいは合金。FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the embodiment, and FIG. 3 is a partially enlarged sectional view of FIG. 1. 1... Container body, 2... Outer shell, 3...
...Inner shell, 4...Gamma ray shielding layer, 5...
...Neutron shielding layer, 6...Cooling fin, 8
...Cavity, 10...Low melting point metal or alloy.
Claims (1)
面に立設される放熱促進部材とを低融点合金を用いて融
着したことを特徴とする使用済核燃料輸送容器。A spent nuclear fuel transport container characterized in that the outer surface of a container body having a radiation shielding layer formed therein and a heat dissipation promoting member erected on the outer surface are fused together using a low melting point alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978171554U JPS598237Y2 (en) | 1978-12-14 | 1978-12-14 | Spent nuclear fuel transport container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978171554U JPS598237Y2 (en) | 1978-12-14 | 1978-12-14 | Spent nuclear fuel transport container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5588199U JPS5588199U (en) | 1980-06-18 |
| JPS598237Y2 true JPS598237Y2 (en) | 1984-03-13 |
Family
ID=29175561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1978171554U Expired JPS598237Y2 (en) | 1978-12-14 | 1978-12-14 | Spent nuclear fuel transport container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS598237Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6209110B2 (en) * | 2014-03-17 | 2017-10-04 | 三菱重工業株式会社 | Radioactive material storage container |
| JP7356953B2 (en) * | 2020-06-30 | 2023-10-05 | 三菱重工業株式会社 | Buffer lid, protection device for radioactive material storage container, and protection method for radioactive material storage container |
-
1978
- 1978-12-14 JP JP1978171554U patent/JPS598237Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5588199U (en) | 1980-06-18 |
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