JPH07113889A - Reactor pressure vessel - Google Patents
Reactor pressure vesselInfo
- Publication number
- JPH07113889A JPH07113889A JP5258469A JP25846993A JPH07113889A JP H07113889 A JPH07113889 A JP H07113889A JP 5258469 A JP5258469 A JP 5258469A JP 25846993 A JP25846993 A JP 25846993A JP H07113889 A JPH07113889 A JP H07113889A
- Authority
- JP
- Japan
- Prior art keywords
- lower mirror
- pressure vessel
- stub tube
- mirror portion
- projection part
- 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
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、原子炉圧力容器に関す
るものである。FIELD OF THE INVENTION The present invention relates to a reactor pressure vessel.
【０００２】[0002]
【従来の技術】図２は、従来の原子炉圧力容器を示すも
のである。2. Description of the Related Art FIG. 2 shows a conventional reactor pressure vessel.
【０００３】図中、１は原子炉における圧力容器本体２
の底部を構成する球面状の下鏡部、３は下鏡部１に形成
された、図示しない制御棒を上下方向へ出し入れするた
めの貫通孔、４は貫通孔３の上端に連通させて接合され
た、前記図示しない制御棒を案内するためのスタブチュ
ーブ、５は下鏡部１の上面に施された、スタブチューブ
４と同じ材質の被覆、６は下鏡部１とスタブチューブ４
との溶接部である。In the figure, 1 is a pressure vessel main body 2 in a nuclear reactor.
The spherical lower mirror portion 3 that constitutes the bottom of the lower mirror portion, 3 is a through hole formed in the lower mirror portion 1 for vertically inserting and removing a control rod (not shown), and 4 is connected to the upper end of the through hole 3 so as to communicate therewith. The stub tube 5 for guiding the control rod (not shown) is coated on the upper surface of the lower mirror section 1 with the same material as the stub tube 4, and 6 is the lower mirror section 1 and the stub tube 4.
It is a welded part with.
【０００４】そして、下鏡部１に形成された貫通孔３及
びスタブチューブ４を介して、原子炉の圧力容器本体２
内部に、図示しない制御棒を出し入れすることにより、
原子炉の出力を調整するようになっている。Then, the pressure vessel body 2 of the nuclear reactor is inserted through the through hole 3 and the stub tube 4 formed in the lower mirror section 1.
By putting a control rod (not shown) in and out,
It is designed to adjust the power output of the reactor.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来の原子炉圧力容器には、以下のような問題があった。However, the conventional reactor pressure vessel described above has the following problems.
【０００６】即ち、上記したように、原子炉では圧力容
器本体２の下鏡部１にスタブチューブ４を直接接合する
構造としていたが、下鏡部１は極く厚肉であり、反対に
スタブチューブ４は薄肉であるため、両者間に大きな剛
性の差及び熱容量の差が生じ、原子炉を起動・停止した
時に、上記剛性の差及び熱容量の差によって、図に破線
イで示す部分、即ち溶接部６近傍における下鏡部１と被
覆５との境界部分に、応力が集中するという問題あっ
た。That is, as described above, in the nuclear reactor, the stub tube 4 is directly joined to the lower mirror portion 1 of the pressure vessel main body 2, but the lower mirror portion 1 is extremely thick and, conversely, is a stub. Since the tube 4 is thin, a large difference in rigidity and a difference in heat capacity occur between the two, and when the reactor is started and stopped, the difference in rigidity and the difference in heat capacity cause a portion indicated by a broken line a in FIG. There was a problem that stress was concentrated on the boundary portion between the lower mirror portion 1 and the coating 5 in the vicinity of the welded portion 6.
【０００７】本発明は、上述の実情に鑑み、下鏡部とス
タブチューブとの接合部分に応力が集中するのを防止し
得るようにした原子炉圧力容器を提供することを目的と
するものである。The present invention has been made in view of the above circumstances, and an object thereof is to provide a reactor pressure vessel capable of preventing stress from concentrating on the joint portion between the lower mirror portion and the stub tube. is there.
【０００８】[0008]
【課題を解決するための手段】本発明は、原子炉の圧力
容器本体の底部を構成する下鏡部の上面とスタブチュー
ブとの接合部分に、下鏡部から上方へ延びるリング状の
突出部を形成し、該突出部の表面を含む下鏡部の上面に
スタブチューブと同じ材質の被覆を施したことを特徴と
する原子炉圧力容器にかかるものである。According to the present invention, a ring-shaped projecting portion extending upward from a lower mirror portion is provided at a joint portion between an upper surface of a lower mirror portion forming a bottom portion of a pressure vessel main body of a nuclear reactor and a stub tube. And the upper surface of the lower mirror portion including the surface of the protrusion is coated with the same material as the stub tube.
【０００９】[0009]
【作用】本発明の作用は以下の通りである。The operation of the present invention is as follows.
【００１０】下鏡部の上面に、下鏡部から上方へ延び
る、リング状の突出部を形成し、該突出部とスタブチュ
ーブとを溶接によって接合することにより、スタブチュ
ーブと突出部との間の剛性の差や熱容量の差が小さくな
り、且つ、体積の小さい突出部は周囲に熱を奪われて容
易に低温化されるので、原子炉を起動・停止した場合で
も、突出部に応力が集中することが防止される。A ring-shaped protruding portion extending upward from the lower mirror portion is formed on the upper surface of the lower mirror portion, and the protruding portion and the stub tube are welded to each other so that a space between the stub tube and the protruding portion is formed. The difference in rigidity and the difference in heat capacity are small, and the projecting part with a small volume is deprived of heat by the surroundings and is easily cooled to a low temperature.Therefore, stress is applied to the projecting part even when the reactor is started or stopped. Concentration is prevented.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面を参照しつつ説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は、本発明の一実施例である。FIG. 1 shows an embodiment of the present invention.
【００１３】図中、１は原子炉における圧力容器本体２
の底部を構成する球面状の下鏡部、３は下鏡部１に形成
された、図示しない制御棒を上下方向へ出し入れするた
めの貫通孔、４は貫通孔３の上端に連通させて接合され
た、前記図示しない制御棒を案内するためのスタブチュ
ーブ、５は下鏡部１の上面に施された、スタブチューブ
４と同材質の被覆、６は下鏡部１とスタブチューブ４と
の溶接部である。In the figure, 1 is a pressure vessel main body 2 in a nuclear reactor.
The spherical lower mirror portion 3 that constitutes the bottom of the lower mirror portion 3 is a through hole formed in the lower mirror portion 1 for vertically inserting and removing a control rod (not shown), and 4 is connected to the upper end of the through hole 3 and joined. The stub tube 5 for guiding the control rod (not shown) is coated on the upper surface of the lower mirror section 1 with the same material as that of the stub tube 4, and 6 denotes the lower mirror section 1 and the stub tube 4. It is a welded part.
【００１４】そして、本発明では上記構成に加えて更
に、下鏡部１における貫通孔３の上端に、下鏡部１から
上方へ延びる、スタブチューブ４とほぼ同径のリング状
をした突出部７を形成し、該突出部７の表面にスタブチ
ューブ４と同じ材質の被覆５を施す。In the present invention, in addition to the above structure, a ring-shaped protruding portion extending upward from the lower mirror portion 1 and having a diameter substantially the same as that of the stub tube 4 is further provided at the upper end of the through hole 3 in the lower mirror portion 1. 7 is formed, and a coating 5 made of the same material as the stub tube 4 is applied to the surface of the protruding portion 7.
【００１５】次に、作動について説明する。Next, the operation will be described.
【００１６】下鏡部１に形成された貫通孔３及びスタブ
チューブ４を介して、原子炉の圧力容器本体２内部に、
図示しない制御棒を出し入れすることにより、原子炉の
出力を調整する過程については図２と同様なので説明を
省略する。Through the through hole 3 and the stub tube 4 formed in the lower mirror section 1, inside the pressure vessel main body 2 of the nuclear reactor,
The process of adjusting the power output of the nuclear reactor by putting in and out a control rod (not shown) is the same as that shown in FIG.
【００１７】本発明では、下鏡部１における貫通孔３の
上端に、下鏡部１から上方へ延びる、スタブチューブ４
とほぼ同径のリング状をした突出部７を形成し、該突出
部７とスタブチューブ４とを溶接によって接合するよう
にしたことにより、スタブチューブ４と突出部７との間
の剛性の差や熱容量の差が小さくなり、且つ、体積の小
さい突出部７は周囲に熱を奪われて容易に低温化される
ので、原子炉を起動・停止した場合でも、突出部７に応
力が集中することが防止される。In the present invention, the stub tube 4 extending upward from the lower mirror portion 1 is provided at the upper end of the through hole 3 in the lower mirror portion 1.
A ring-shaped protrusion 7 having a diameter substantially the same as that of the above is formed, and the protrusion 7 and the stub tube 4 are joined by welding, so that a difference in rigidity between the stub tube 4 and the protrusion 7 is formed. Since the difference in heat capacity and the difference in heat capacity are small and the protrusion 7 having a small volume is deprived of heat by the surroundings and easily lowered in temperature, stress is concentrated on the protrusion 7 even when the reactor is started or stopped. Is prevented.
【００１８】尚、本発明は、上述の実施例にのみ限定さ
れるものではなく、本発明の要旨を逸脱しない範囲内に
おいて種々変更を加え得ることは勿論である。The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
【００１９】[0019]
【発明の効果】以上説明したように、本発明の原子炉圧
力容器によれば、下鏡部とスタブチューブとの接合部分
に応力が集中するのを防止することができるという優れ
た効果を奏し得る。As described above, according to the reactor pressure vessel of the present invention, it is possible to prevent stress from being concentrated on the joint portion between the lower mirror portion and the stub tube. obtain.
【図１】本発明の一実施例の概略側断面図である。FIG. 1 is a schematic side sectional view of an embodiment of the present invention.
【図２】従来例の概略側断面図である。FIG. 2 is a schematic side sectional view of a conventional example.
１ 下鏡部 ２ 圧力容器本体 ４ スタブチューブ ５ 被覆 ７ 突出部 1 Lower mirror 2 Pressure vessel body 4 Stub tube 5 Cover 7 Projection
Claims (1)
下鏡部の上面とスタブチューブとの接合部分に、下鏡部
から上方へ延びるリング状の突出部を形成し、該突出部
の表面を含む下鏡部の上面にスタブチューブと同じ材質
の被覆を施したことを特徴とする原子炉圧力容器。1. A ring-shaped projecting portion extending upward from the lower mirror portion is formed at a joint portion between an upper surface of the lower mirror portion constituting a bottom portion of a pressure vessel main body of a nuclear reactor and a stub tube. A reactor pressure vessel characterized in that the upper surface of the lower mirror portion including the surface is coated with the same material as the stub tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5258469A JPH07113889A (en) | 1993-10-15 | 1993-10-15 | Reactor pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5258469A JPH07113889A (en) | 1993-10-15 | 1993-10-15 | Reactor pressure vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07113889A true JPH07113889A (en) | 1995-05-02 |
Family
ID=17320664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5258469A Pending JPH07113889A (en) | 1993-10-15 | 1993-10-15 | Reactor pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07113889A (en) |
-
1993
- 1993-10-15 JP JP5258469A patent/JPH07113889A/en active Pending
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