JPH0147757B2 - - Google Patents
Info
- Publication number
- JPH0147757B2 JPH0147757B2 JP6626081A JP6626081A JPH0147757B2 JP H0147757 B2 JPH0147757 B2 JP H0147757B2 JP 6626081 A JP6626081 A JP 6626081A JP 6626081 A JP6626081 A JP 6626081A JP H0147757 B2 JPH0147757 B2 JP H0147757B2
- Authority
- JP
- Japan
- Prior art keywords
- lead
- shielding material
- mold
- inner cylinder
- outer cylinder
- 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
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【発明の詳細な説明】
本発明は核燃料、放射性物質輸送容器、特に使
用済核燃料輸送容器における鉛遮蔽材の形成方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a lead shielding material in a nuclear fuel or radioactive material transport container, particularly in a spent nuclear fuel transport container.
使用済核燃料、あるいは原子炉内で照射された
物質等の放射性物質は高放射能を有するため、た
とえば第１図、および第２図に示すように、放射
線遮蔽材として鉛を使用した輸送容器に収納され
輸送される。 Radioactive materials such as spent nuclear fuel or materials irradiated inside a nuclear reactor have high radioactivity, so as shown in Figures 1 and 2, for example, transport containers that use lead as a radiation shielding material are stored and transported.
すなわち第１図、および第２図において、１は
内筒、２は外筒であつて、いずれも鋼板製（ステ
ンレス鋼、又は軟鋼）で中心線を共通にする円筒
形に形成され、内筒１、および外筒２の下端部は
鋼板製の底板３に、上端部は鋼板製フランジ４に
溶接され、内筒１と外筒２との間に形成される空
間には放射線を遮蔽するための鉛遮蔽材５が充填
され容器本体が構成される。６は容器本体開口部
を覆う蓋であつて鋼板により形成され、フランジ
４に設けた図示しないボルトにより固定される。 That is, in FIGS. 1 and 2, 1 is an inner cylinder, and 2 is an outer cylinder, both of which are made of steel plate (stainless steel or mild steel) and are formed into a cylindrical shape with a common center line. 1, and the lower end of the outer cylinder 2 is welded to a bottom plate 3 made of a steel plate, and the upper end is welded to a flange 4 made of a steel plate, and a space formed between the inner cylinder 1 and the outer cylinder 2 is provided for shielding radiation. The lead shielding material 5 is filled to form a container body. Reference numeral 6 denotes a lid that covers the opening of the main body of the container, is made of a steel plate, and is fixed by bolts (not shown) provided on the flange 4.
７は外筒２の外側に設けられた放熱用フインで
各フインの間には中性子遮蔽材８が設けられる。
９および１０はトラニオンで、１１および１２は
シヨツクアブソーバーである。 Reference numeral 7 denotes heat dissipation fins provided on the outside of the outer cylinder 2, and a neutron shielding material 8 is provided between each fin.
9 and 10 are trunnions, and 11 and 12 are shock absorbers.
従来、上記のような核燃料、放射性物質輸送容
器において内筒１と外筒２との間に放射線を遮蔽
するための鉛遮蔽材５を充填する方法としては、
底板３に内筒１と外筒２の下端部を溶接した後、
内筒１と外筒２との間に溶融鉛を注湯し冷却凝固
させる方法が行はれているが、冷却に伴なつてお
こる凝固収縮、および熱収縮のため凝固した鉛は
内筒１の外側面には密着するが、外筒２の内側面
に密着させることは極めて困難で、そのため鉛遮
蔽材の充填作業にあたつては外筒２の内側面に特
殊な表面処理を行う必要があり、経済的にも高価
となり、かつ多年の経験と熟練した技能が必要で
あつた。 Conventionally, as a method of filling a lead shielding material 5 for shielding radiation between the inner cylinder 1 and the outer cylinder 2 in the nuclear fuel and radioactive material transport container as described above,
After welding the lower ends of the inner cylinder 1 and outer cylinder 2 to the bottom plate 3,
A method has been used in which molten lead is poured between the inner cylinder 1 and the outer cylinder 2 and cooled and solidified. However, it is extremely difficult to make it adhere tightly to the inside surface of the outer cylinder 2, so it is necessary to perform a special surface treatment on the inside surface of the outer cylinder 2 when filling with lead shielding material. However, it was economically expensive and required many years of experience and skilled skills.
本発明はこのような核燃料、放射性物質輸送容
器における鉛遮蔽材の充填方法に困難性を解決す
るものであつて、内筒１の外側に円筒形型枠を設
けることにより内筒１とこの円筒形型枠で鋳型を
構成し、この鋳型に溶融鉛を注湯し冷却凝固させ
ることにより、内筒１の外側に必要とする鉛遮蔽
材の寸法よりやや大なる鉛層を形成させ、次いで
この内筒外側面に密着した鉛層を必要とする鉛遮
蔽材の寸法に機械加工した後外筒２を嵌合するこ
とを特徴とするものである。 The present invention solves the difficulty in filling a lead shielding material into a container for transporting nuclear fuel and radioactive materials. A mold is constructed with a form frame, and molten lead is poured into the mold and cooled and solidified to form a lead layer on the outside of the inner cylinder 1 that is slightly larger in size than the required lead shielding material. This is characterized in that the outer cylinder 2 is fitted after being machined to the dimensions of the lead shielding material that requires a lead layer in close contact with the outer surface of the inner cylinder.
以下実施例につき図面にもとずいて説明する。 Examples will be described below with reference to the drawings.
第３図は鋳型の構成を示す図面で、１は内筒、
１３は内筒１と中心線を共通にする円筒形型枠で
ある。円筒形型枠としては通常金属製割型を使用
し、内筒１の外側面と円筒形型枠の内側面との間
隔は、要求される鉛遮蔽材の寸法、および鋳造時
の凝固収縮、熱収縮、鋳型精度、並びに機械加工
代を考慮して設定する。 Figure 3 is a drawing showing the structure of the mold, where 1 is an inner cylinder;
13 is a cylindrical formwork that shares a center line with the inner cylinder 1. A split metal mold is usually used as the cylindrical form, and the distance between the outer surface of the inner cylinder 1 and the inner surface of the cylindrical form is determined by the required dimensions of the lead shielding material, solidification shrinkage during casting, Set by considering heat shrinkage, mold accuracy, and machining allowance.
上記鋳型に溶融鉛を注湯して冷却凝固せしめた
後、円筒形型枠１３を取り去り、内筒１の外側面
に密着した鉛層を所定の寸法に機械加工した後、
100℃前後に加熱した外筒２を嵌合し、次いで第
４図に示すように内筒１と外筒２の端部を底板３
とフランジ４に溶接する。図中ａ，ｂ，ｃ，ｄ，
ｅ，ｆ，ｇ，ｈは溶接個所を示す。 After pouring molten lead into the mold and letting it cool and solidify, the cylindrical formwork 13 is removed, and the lead layer that is in close contact with the outer surface of the inner cylinder 1 is machined to a predetermined size.
The outer cylinder 2 heated to around 100°C is fitted together, and then the ends of the inner cylinder 1 and the outer cylinder 2 are connected to the bottom plate 3 as shown in FIG.
and weld to flange 4. In the figure a, b, c, d,
e, f, g, and h indicate welding locations.
本発明方法によれば従来の方法に比較し、特に
多年の経験と高度の熟練を必要とせず、経済的、
かつ容易に鉛遮蔽材を形成することができる。又
本発明方法によれば組立前に鉛遮蔽材を検査でき
るので欠陥の発見が容易であるので安全性が向上
する。更に本発明方法によれば鉛遮蔽材の外側面
と外筒２の内側面を完全に密着させることも可能
であり、また必要に応じ鉛遮蔽材の外側面と外筒
２の内側面の間に適宜な空〓を設けることも容易
である。 Compared to conventional methods, the method of the present invention does not require many years of experience or high skill, is economical,
Moreover, a lead shielding material can be easily formed. Furthermore, according to the method of the present invention, the lead shielding material can be inspected before assembly, making it easy to find defects and improving safety. Furthermore, according to the method of the present invention, it is possible to completely bring the outer surface of the lead shielding material and the inner surface of the outer cylinder 2 into close contact, and if necessary, it is also possible to bring the outer surface of the lead shielding material and the inner surface of the outer cylinder 2 into close contact with each other. It is also easy to provide an appropriate space in the area.
第１図は本発明を説明するための核燃料、放射
性物質輸送容器の縦断面図、第２図は第１図のＡ
−Ａ線における横断面図、第３図は本発明におけ
る鋳型の構成を例示する図面、第４図は容器本体
の組立方法を例示する図面である。
１……内筒、２……外筒、３……底板、４……
フランジ、５……鉛遮蔽材、６……蓋、１３……
円筒型型枠。
FIG. 1 is a vertical cross-sectional view of a nuclear fuel and radioactive material transport container for explaining the present invention, and FIG.
- A cross-sectional view taken along line A, FIG. 3 is a drawing illustrating the configuration of the mold in the present invention, and FIG. 4 is a drawing illustrating the method of assembling the container body. 1... Inner cylinder, 2... Outer cylinder, 3... Bottom plate, 4...
Flange, 5... Lead shielding material, 6... Lid, 13...
Cylindrical formwork.
Claims (1)
鉛遮蔽材を充填してなる核燃料、放射性物質輸送
容器において、該内筒の外側に円筒形型枠を設け
鋳型を構成し、該鋳型に溶融鉛を注湯し冷却凝固
せしめ、内筒外側面に所要鉛遮蔽材の寸法よりや
や大なる鉛層を形成させた後前記型枠を取りはず
し次いで該鉛層を所要寸法に機械加工した後外筒
を嵌合することを特徴とする核燃料、放射性物質
輸送容器における鉛遮蔽材の形成方法。1. In a nuclear fuel or radioactive material transport container in which the side wall of the container body is composed of an inner cylinder and an outer cylinder, and a lead shielding material is filled in the middle, a cylindrical mold is provided outside the inner cylinder to constitute a mold, Molten lead was poured into the mold and allowed to cool and solidify to form a lead layer slightly larger than the required size of the lead shielding material on the outer surface of the inner cylinder.The mold was then removed and the lead layer was machined to the required size. A method for forming a lead shielding material in a nuclear fuel or radioactive material transport container, the method comprising fitting a rear outer cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6626081A JPS57179798A (en) | 1981-04-30 | 1981-04-30 | Method of forming lead shielding material in cask for nuclear fuel, radioactive material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6626081A JPS57179798A (en) | 1981-04-30 | 1981-04-30 | Method of forming lead shielding material in cask for nuclear fuel, radioactive material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57179798A JPS57179798A (en) | 1982-11-05 |
| JPH0147757B2 true JPH0147757B2 (en) | 1989-10-16 |
Family
ID=13310704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6626081A Granted JPS57179798A (en) | 1981-04-30 | 1981-04-30 | Method of forming lead shielding material in cask for nuclear fuel, radioactive material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57179798A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6310244B2 (en) * | 2013-12-06 | 2018-04-11 | 日立造船株式会社 | Manufacturing method of cask for storing radioactive material |
-
1981
- 1981-04-30 JP JP6626081A patent/JPS57179798A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57179798A (en) | 1982-11-05 |
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