JPH052276B2 - - Google Patents
Info
- Publication number
- JPH052276B2 JPH052276B2 JP61161966A JP16196686A JPH052276B2 JP H052276 B2 JPH052276 B2 JP H052276B2 JP 61161966 A JP61161966 A JP 61161966A JP 16196686 A JP16196686 A JP 16196686A JP H052276 B2 JPH052276 B2 JP H052276B2
- Authority
- JP
- Japan
- Prior art keywords
- absorbing material
- control rod
- neutron absorbing
- wings
- wing
- 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 - Lifetime
Links
- 239000011358 absorbing material Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 238000012856 packing Methods 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052580 B4C Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010959 steel Substances 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
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Vibration Dampers (AREA)
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は原子炉用制御棒の耐震性向上に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to improving the earthquake resistance of control rods for nuclear reactors.
（従来の技術）
原子炉においては、炉出力の制御のため、複数
本の燃料集合体の間に制御棒を挿入できるよう構
成してある。この原子炉用制御棒としてステンレ
スは、鋼製のウイングの幅方向に形成した複数の
穴に中性子吸収材を充填した構造のものが知られ
ている。(Prior Art) Nuclear reactors are configured so that control rods can be inserted between a plurality of fuel assemblies in order to control reactor output. A known control rod for a nuclear reactor is made of stainless steel and has a structure in which a plurality of holes formed in the width direction of a steel wing are filled with a neutron absorbing material.
第３図および第４図はそ具体例を示すもので、
制御棒１は４枚のウイング２を十字状に配置し、
結合部材３を介して互いを固定することにより構
成されている。４はウイング２の上端間を連結す
るハンドルである。 Figures 3 and 4 show specific examples.
The control rod 1 has four wings 2 arranged in a cross shape,
They are constructed by fixing each other via a coupling member 3. 4 is a handle that connects the upper ends of the wings 2.
各ウイング２はステンレス鋼材からなり、その
幅方向に形成した複数の中性子吸収材充填穴５を
有している。これらの穴の内部にはボロンカーバ
イドB4C等からなる中性子吸収材６が充填されて
いる。また、ウイング２の外側端部にはステンレ
ス鋼等の線条体からなるパツキング７が配置され
ている。 Each wing 2 is made of stainless steel and has a plurality of neutron absorbing material filling holes 5 formed in its width direction. The insides of these holes are filled with a neutron absorbing material 6 made of boron carbide B 4 C or the like. Further, a packing 7 made of a filamentous material such as stainless steel is arranged at the outer end of the wing 2.
このような構造のウイング２を作るに際して
は、第５図に示すようにウイング２の側端部に該
当する位置に形成された開口部分８から中性子吸
収材充填穴５内に中性子吸収材６を充填し、その
後にパツキング７を配置し、最後に開口部８の対
向する一対の板部分２ａを互いに内側に折曲げて
合せ目を溶接する。 When making the wing 2 having such a structure, as shown in FIG. After filling, the packing 7 is placed, and finally, the pair of opposing plate portions 2a of the opening 8 are bent inwardly and the seams are welded.
このようにして形成されたウイング２の４枚
を、第４図に示すように、中性子吸収材充填穴封
止用の溶接部８′が結合部材３から離間するよう
十字状に配置し、上記溶接部８′の反対側の面を
結合部材３に溶接接合して制御棒１としたもので
ある。 As shown in FIG. 4, the four wings 2 thus formed are arranged in a cross shape so that the welded part 8' for sealing the neutron absorbing material filling hole is spaced apart from the coupling member 3. The control rod 1 is formed by welding the surface opposite the welded portion 8' to the connecting member 3.
第６図は上述の制御棒の原子炉内における使用
状態を示すもので、制御棒１は４体の燃料集合体
９の間に形成される十字状の間隙１０に設置さ
れ、制御棒駆動装置１１により間隙１０内を上下
方向に所定ストローク駆動され、原子炉の出力を
調整する。燃料集合体９はそれらの上下端におい
て、支持金具１２，１３により支持されている。 FIG. 6 shows the use state of the above-mentioned control rod in a nuclear reactor. The control rod 1 is installed in a cross-shaped gap 10 formed between four fuel assemblies 9, and the control rod drive device 11 for a predetermined stroke in the vertical direction within the gap 10 to adjust the output of the nuclear reactor. The fuel assembly 9 is supported by support fittings 12 and 13 at its upper and lower ends.
（発明が解決しようとする問題点）
上述のような構成の原子炉において、地震発生
時には原子炉や速やかに停止させるために制御棒
は全数が炉心内に緊急挿入（スクラム）される。(Problems to be Solved by the Invention) In a nuclear reactor configured as described above, in the event of an earthquake, all control rods are urgently inserted into the reactor core (scram) in order to quickly shut down the reactor.
この時、第７図に示すように上下端のみで支持
されている燃料集合体９は地震動により湾曲し、
これにより制御棒１が通るべき間隙１０も変形す
るために、制御棒１は強制的に撓みながら全挿入
されることになる。 At this time, as shown in FIG. 7, the fuel assembly 9, which is supported only at the upper and lower ends, is bent due to the earthquake motion.
As a result, the gap 10 through which the control rod 1 should pass is also deformed, so that the control rod 1 is fully inserted while being forcibly bent.
この際、制御棒１に発生する曲げモーメント分
布は第８図に示すようにウイング２の側端部で最
大となり、同部に大きな曲げ応力が発生する。 At this time, the bending moment distribution generated in the control rod 1 becomes maximum at the side end portion of the wing 2, as shown in FIG. 8, and a large bending stress is generated in this portion.
しかしながら、この部分は板厚の薄い部分であ
り、かつ溶接施工をを受けているため強度的に他
の箇所より弱い箇所である。もし溶接部に板厚を
貫通するクラツクが発生した場合には、中性子吸
収材６が外部に流出する危険があり原子炉の安全
性に及ぼす影響は大である。 However, this part is thinner and has been welded, so its strength is weaker than other parts. If a crack that penetrates the plate thickness occurs in the welded portion, there is a risk that the neutron absorbing material 6 will leak out to the outside, and this will have a large effect on the safety of the reactor.
［発明の構成］
（問題点を解決するための手段）
本発明の原子炉用制御棒は、ウイングの幅方向
に形成された複数の中性子吸収材充填穴を有し、
これらの穴内に中性子吸収材が充填された長方形
状のウイングの複数枚を結合部材に固着してなる
原子炉用制御棒において、前記中性子吸収材充填
穴封止用の溶接部が前記結合部材側となるように
前記各ウイングと結合部材とを固着してなること
を特徴とするものである。[Structure of the Invention] (Means for Solving the Problems) The nuclear reactor control rod of the present invention has a plurality of neutron absorbing material filling holes formed in the width direction of the wing,
In a nuclear reactor control rod in which a plurality of rectangular wings whose holes are filled with neutron absorbing material are fixed to a connecting member, the welded portion for sealing the neutron absorbing material filling hole is on the connecting member side. It is characterized in that each of the wings and the coupling member are fixedly attached so that the following is achieved.
（作 用）
本発明の原子炉用制御棒では、上述のようにウ
イングの溶接加工箇所がそれぞれ中心部になるよ
う構成されているので、溶接加工箇所に加わる曲
げモーメントは小さく強度上の信頼性が向上す
る。(Function) In the nuclear reactor control rod of the present invention, as described above, the welded parts of the wing are arranged in the center, so the bending moment applied to the welded parts is small and the strength is reliable. will improve.
（実施例）
以下、図面を参照して本発明の実施例を説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図において、制御棒１は４枚のウイング２
を十字状に配置し、結合部材３を介して互いを固
定することにより構成されている。４はウイング
２の上端間を連結するハンドルである。 In Figure 1, the control rod 1 has four wings 2.
are arranged in a cross shape and fixed to each other via a connecting member 3. 4 is a handle that connects the upper ends of the wings 2.
ウイング２はステンレス鋼材からなり、その幅
方向に形成した複数の中性子吸収材充填穴５を有
している。これらの穴の内部にはB4C等からなる
中性子吸収材６が充填されている。また、ウイン
グ２の内側端部にはステンレス鋼等の線条体から
なるパツキング７が配置されている。 The wing 2 is made of stainless steel and has a plurality of neutron absorbing material filling holes 5 formed in its width direction. The insides of these holes are filled with a neutron absorbing material 6 made of B 4 C or the like. Furthermore, a packing 7 made of a filament of stainless steel or the like is arranged at the inner end of the wing 2.
このような構造のウイング２を作るに際して
は、第５図に示すようにウイング２の制御部に形
成された開口部分８から中性子吸収材充填穴５内
に中性子吸収材６を充填し、その後にパツキング
７を配置し、最後に開口部８の対向する一対の板
部分２ａを互いに内側に折曲げて合せ目を溶接す
る。上述のように形成されたウイング２の４枚を
各中性子吸収材充填穴封止用の溶接部８′が制御
棒１の中心側にくるように配置し、これらの溶接
部８′の近傍をを結合部材３に溶接により結合さ
せる。 When making the wing 2 having such a structure, as shown in FIG. The packing 7 is arranged, and finally the pair of opposing plate portions 2a of the opening 8 are bent inwardly and the seams are welded. The four wings 2 formed as described above are arranged so that the welded parts 8' for sealing each neutron absorbing material filling hole are located at the center of the control rod 1, and the vicinity of these welded parts 8' are is connected to the connecting member 3 by welding.
［発明の効果］
本発明によれば板厚が薄くかつ溶接施工を受け
て他の箇所より強度が低下している中性子吸収材
充填穴封止用の溶接部が制御棒の中心部に来るこ
とになる。[Effects of the Invention] According to the present invention, the welded part for sealing the neutron absorbing material filling hole, which is thin and whose strength is lower than other parts due to welding, is located in the center of the control rod. become.
この場合、制御棒の中心部は第８図ｂに示すよ
うに曲げモーメントの小さい領域にあり、従つて
曲げ応力の発生も小さくなつている。 In this case, the center of the control rod is in a region where the bending moment is small, as shown in FIG. 8b, and therefore the bending stress is also small.
なお、本発明においても各ウイングの外側端部
は従来と同様に大きな曲げモーメントを受ける
が、中性子吸収材充填穴の深さを適当に選定する
ことで強度的に充分な板厚とすることが可能であ
る。 In addition, in the present invention, the outer end of each wing is subjected to a large bending moment as in the conventional case, but by appropriately selecting the depth of the neutron absorbing material filling hole, it is possible to make the plate thick enough for strength. It is possible.
このように本発明によれば、強度的に信頼性の
ある原子炉用制御棒を得ることができる。 As described above, according to the present invention, a control rod for a nuclear reactor that is strong and reliable can be obtained.
第１図は本発明の原子炉用制御棒の実施例を示
す一部縦断側面図、第２図は第１図の−線に
沿う横断面図、第３図は従来の原子炉用制御棒を
示す一部縦断側面図、第４図は第３図の−線
に沿う横断面図、第５図はウイングの製造方法を
説明する横断面図、第６図は制御棒の設置状況を
示す炉心部の斜視図、第７図は地震時における燃
料集合体と制御棒の挙動を示す縦断面図、第８図
ａ，ｂは地震時における制御棒の挙動を示す側面
図と曲げモーメント図である。
１…制御棒、２…ウイング、３…結合部材、４
…ハンドル、５…中性子吸収材充填穴、６…中性
子吸収材、７…パツキング、８…開口部材、８′
…中性子吸収材充填穴封止用の溶接部、９…燃料
集合体、１０…間隙、１１…制御棒駆動装置、１
２，１３…支持金具。
Fig. 1 is a partially longitudinal side view showing an embodiment of the nuclear reactor control rod of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a conventional nuclear reactor control rod. Figure 4 is a cross-sectional view taken along the - line in Figure 3, Figure 5 is a cross-sectional view illustrating the wing manufacturing method, and Figure 6 shows how the control rods are installed. A perspective view of the reactor core, Figure 7 is a vertical cross-sectional view showing the behavior of the fuel assembly and control rods during an earthquake, and Figures 8a and b are side views and bending moment diagrams showing the behavior of the control rods during an earthquake. be. 1...control rod, 2...wing, 3...coupling member, 4
...handle, 5...neutron absorbing material filling hole, 6...neutron absorbing material, 7...packing, 8...opening member, 8'
... Welded part for sealing the neutron absorbing material filling hole, 9... Fuel assembly, 10... Gap, 11... Control rod drive device, 1
2,13...Supporting metal fittings.
Claims (1)
吸収材充填穴を有し、これらの穴内に中性子吸収
材が充填された長方形状のウイングの複数枚を結
合部材に固着してなる原子炉用制御棒において、
前記中性子吸収材充填穴封止用の溶接部が前記結
合部材側となるように前記各ウイングと結合部材
とを固着してなることを特徴とする原子炉用制御
棒。1. A nuclear reactor control comprising a plurality of rectangular wings having a plurality of neutron absorbing material filling holes formed in the width direction of the wings and having the neutron absorbing material filled in these holes fixed to a connecting member. In the stick,
A control rod for a nuclear reactor, characterized in that each of the wings and a connecting member are fixedly attached so that the welded portion for sealing the neutron absorbing material filling hole is on the side of the connecting member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61161966A JPS6318293A (en) | 1986-07-11 | 1986-07-11 | Control rod for nuclear reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61161966A JPS6318293A (en) | 1986-07-11 | 1986-07-11 | Control rod for nuclear reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6318293A JPS6318293A (en) | 1988-01-26 |
| JPH052276B2 true JPH052276B2 (en) | 1993-01-12 |
Family
ID=15745459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61161966A Granted JPS6318293A (en) | 1986-07-11 | 1986-07-11 | Control rod for nuclear reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6318293A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010243331A (en) * | 2009-04-06 | 2010-10-28 | Toshiba Corp | Reactor control rod |
-
1986
- 1986-07-11 JP JP61161966A patent/JPS6318293A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6318293A (en) | 1988-01-26 |
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