JPH0549960B2 - - Google Patents
Info
- Publication number
- JPH0549960B2 JPH0549960B2 JP58012680A JP1268083A JPH0549960B2 JP H0549960 B2 JPH0549960 B2 JP H0549960B2 JP 58012680 A JP58012680 A JP 58012680A JP 1268083 A JP1268083 A JP 1268083A JP H0549960 B2 JPH0549960 B2 JP H0549960B2
- Authority
- JP
- Japan
- Prior art keywords
- wing
- absorbing material
- life
- neutron absorbing
- neutron
- 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
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
- Vibration Dampers (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Fluid-Damping Devices (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は原子炉用制御棒に関するものである。[Detailed description of the invention] [Technical field of invention] The present invention relates to a control rod for a nuclear reactor.
従来、原子炉用制御棒として、ステンレス鋼製
のウイングの巾方向に形成した複数の穴にボロン
カーバイド（B4Ｃ）の粉末を充填した構造のも
のが開発されている。
Conventionally, control rods for nuclear reactors have been developed that have a structure in which boron carbide (B 4 C) powder is filled in a plurality of holes formed in the width direction of stainless steel wings.
しかしながら、上記のような構造の制御棒を、
例えば熱中性子炉において使用すると、その先端
部および側端部が高い中性子束に照射されるた
め、これら先端部、側端部に位置するB4Ｃ粉末
は、他部のそれに比べて早く劣化してしまう。し
たがつて、一部の中性子吸収材が劣化して寿命に
達しただけで大量の残りの中性子吸収材が寿命に
達しないうちに制御棒を廃棄しなければならず、
全体としての寿命が短かいという課題がある。
However, the control rod with the above structure,
For example, when used in a thermal neutron reactor, the tip and side edges are irradiated with high neutron flux, so the B 4 C powder located at the tip and side edges deteriorates faster than in other parts. I end up. Therefore, even if only a portion of the neutron absorbing material deteriorates and reaches the end of its life, the control rod must be disposed of before a large amount of the remaining neutron absorbing material reaches its end of life.
The problem is that the overall lifespan is short.
本発明は上記の事情に基きなされたもので、全
中性子吸収材が同時的に寿命に達するようにして
その長寿命化を達成した原子炉用制御棒を得るこ
とを目的としている。
The present invention was made based on the above-mentioned circumstances, and an object of the present invention is to obtain a control rod for a nuclear reactor in which all the neutron absorbers reach the end of their life at the same time, thereby achieving a longer life.
本発明においては、制御棒の先端部および側端
部にハフニウム（Hf）等の長寿命型中性子吸収
材を配置することによつて原子炉用制御棒全体と
しての長寿命を図つている。
In the present invention, a long-life neutron absorbing material such as hafnium (Hf) is arranged at the tip and side ends of the control rod, thereby extending the life of the entire nuclear reactor control rod.
第１図は本発明一実施例の一部切欠正面図、第
２図は同実施例の一部の横断面図である。図示さ
れるように、制御棒Ａは、十字状に結合部分を持
つ結合部材１に４つのウイング２を十字状になる
ように固定したものから基本構成されている。３
は４つのウイング２の先端間を結んだハンドルで
ある。
FIG. 1 is a partially cutaway front view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a portion of the same embodiment. As shown in the figure, the control rod A basically consists of a connecting member 1 having a cross-shaped connecting portion and four wings 2 fixed in a cross shape. 3
is a handle connecting the tips of the four wings 2.
ウイング２は、その巾方向に形成した複数の穴
２ａを、その長さ方向（第１図では上下方向）に
所要のピツチで配設している。ウイング２の先端
部の穴２ａ内には、Hfからなる長寿命型中性子
吸収材３ａが配置され、他の残りの穴１ａ内に
は、B4Ｃ粉末からなる中性子吸収材４が充填さ
れている。制御棒Ａの外縁部分に該当するウイン
グ２の側端部内には、長さ方向に沿つて、複数の
穴２ａに直交して連通するように縦方向の空間部
２ｂが形成され、この空間部２ｂ内には、穴２ａ
の一端を塞ぐように、Hfからなる長寿命型中性
子吸収材３ｂが配置されている。従つて、この吸
収材３ｂによつて、穴２ａ内からB4Ｃ粉末がこ
ぼれ落ちることが防止される。吸収材３ｂとウイ
ング２の側端との間には、ステンレス鋼材５が配
置されている。 The wing 2 has a plurality of holes 2a formed in its width direction and arranged at a required pitch in its length direction (vertical direction in FIG. 1). A long-life neutron absorbing material 3a made of Hf is placed in the hole 2a at the tip of the wing 2, and a neutron absorbing material 4 made of B4C powder is filled in the remaining holes 1a. There is. A vertical space 2b is formed in the side end of the wing 2, which corresponds to the outer edge of the control rod A, along the length direction so as to communicate orthogonally with a plurality of holes 2a. There is a hole 2a in 2b.
A long-life neutron absorber 3b made of Hf is arranged so as to close one end of the neutron absorber 3b. Therefore, this absorbent material 3b prevents the B 4 C powder from spilling out from inside the hole 2a. A stainless steel material 5 is arranged between the absorbent material 3b and the side edge of the wing 2.
このような構造のウイング２を組立てるに際し
ては、第３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２ｃから穴
２ａ内に吸収材４，３ａを充填し、空間部２ｂに
吸収材３ｂ、ステンレス鋼材５を配置し、そし
て、開口部分２ｃの対向する一対の板部分２ｄを
互いに内側に折曲げて溶接する。従つて、ステン
レス鋼材５の融点は1400℃程度であるのに対し、
吸収材３ｂの融点は2200℃程度とステンレス鋼材
５に比べて大巾に高いから、前記溶接時において
は、吸収材３ｂは溶融されずにステンレス鋼から
なるウイング２の側端部内に包み込まれる。その
ため、吸収材３ｂのHfの原子が溶接部金属中に
混入するおそれがなく、健全な溶接部が得られ
る。なお、ウイング２における中性子吸収材配置
領域の先端から、吸収材３ａを配置すべき範囲に
l1は、２〜５cmであることが好ましく、同領域の
側端から吸収材３ｂを配置すべき範囲l2は１〜２
cmであることが好ましい。l1およびl2が、各々２
cmおよび１cm未満では、高い中性子束領域内に、
吸収材４を構成するB4Ｃ粉末が位置してしまう
からであり、一方、各々５cmおよび２cmを越える
と、中性子束の値が急激に低下した領域内に吸収
材３ａ，３ｂを構成するHfが位置してしまうか
らである。 When assembling the wing 2 with such a structure, as shown in FIG. The absorbent material 3b and the stainless steel material 5 are placed in the space 2b, and the pair of opposing plate portions 2d of the opening portion 2c are bent inward and welded. Therefore, while the melting point of stainless steel material 5 is about 1400℃,
Since the melting point of the absorbent material 3b is approximately 2200° C., which is much higher than that of the stainless steel material 5, during the welding, the absorbent material 3b is not melted but is wrapped within the side end portion of the wing 2 made of stainless steel. Therefore, there is no fear that the Hf atoms of the absorber 3b will be mixed into the weld metal, and a sound weld can be obtained. In addition, from the tip of the neutron absorber placement area in the wing 2 to the range where the absorber 3a is to be placed.
It is preferable that l 1 is 2 to 5 cm, and the range l 2 in which the absorbent material 3b should be placed from the side edge of the same area is 1 to 2 cm.
Preferably, it is cm. l 1 and l 2 are each 2
cm and below 1 cm, within the high neutron flux region,
This is because the B 4 C powder that makes up the absorber 4 will be located, while the Hf that makes up the absorbers 3a and 3b will be located in the region where the neutron flux value drops sharply when exceeding 5 cm and 2 cm, respectively. This is because it will be located.
以上のように制御棒Ａは構成されているので、
これを実使用に供すると、ウイング２内の全吸収
材は、実質的に均一に劣化して行く。従つて、結
果的に制御棒Ａは長寿命化する。 Since control rod A is configured as described above,
When this is put into practical use, all the absorbent material within the wing 2 deteriorates substantially uniformly. Therefore, the life of the control rod A is extended as a result.
以上説明したように本発明は、高中性子束が照
射される原子炉用制御棒の先端部と側端部の中性
子吸収材を、長寿命型中性子吸収材に置換したの
で、局所的寿命短縮を防止して原子炉用制御棒全
体の寿命をほぼ均等化し、全体の寿命を長くする
ことができる。
As explained above, the present invention replaces the neutron absorbing materials at the tips and side ends of nuclear reactor control rods that are irradiated with high neutron flux with long-life neutron absorbing materials, thereby reducing local life shortening. By preventing this, the life of the entire control rod for a nuclear reactor can be approximately equalized, and the overall life can be lengthened.
また、ステンレス鋼製の各ウイングの側端部内
に、長寿命型中性子吸収材を配置すると共に、こ
の吸収材とこのウイングの側端との間にステンレ
ス鋼材を配置し、このウイングの一対の開口側端
を内方に折曲して溶着するので、その溶着時の加
熱により高融点の長寿命型中性子吸収材が溶融せ
ずに、ステンレス鋼とウイングの側端部内に包み
込むことができる。その結果、長寿命型中性子吸
収材の原子が溶着部金属中に混入するおそれがな
く、健全な溶着部を得ることができる。 In addition, a long-life neutron absorbing material is placed inside the side end of each wing made of stainless steel, and a stainless steel material is placed between the absorbing material and the side end of the wing. Since the side edges are bent inward and welded, the long-life neutron absorbing material with a high melting point does not melt due to heating during welding, and can be wrapped inside the stainless steel and the side edges of the wing. As a result, there is no fear that atoms of the long-life neutron absorbing material will be mixed into the weld metal, and a healthy weld can be obtained.
第１図は本発明一実施例の一部切欠正面図、第
２図および第３図は同実施例の一部を示す横断面
図である。
２……ウイング、２ａ……穴、３ａ，３ｂ……
長寿命型中性子吸収材、４……中性子吸収材、５
……ステンレス鋼材。
FIG. 1 is a partially cutaway front view of an embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views showing a portion of the embodiment. 2...wing, 2a...hole, 3a, 3b...
Long-life neutron absorbing material, 4...Neutron absorbing material, 5
...Stainless steel material.
Claims (1)
内に中性子吸収材が充填された、少なくとも１つ
の長方形状のステンレス鋼製のウイングを有する
原子炉用制御棒において、前記ウイングの先端部
に位置する少なくとも１つの前記穴内に充填され
た前記中性子吸収材を、長寿命型中性子吸収材に
置換し、残りの穴内に充填された前記中性子吸収
材をボロンカーバイドから構成し、前記ウイング
の側端部内に、前記穴の一端を塞ぐように前記ウ
イングの長さ方向に沿つて長寿命型中性子吸収材
を配置し、この長寿命型中性子吸収材と前記ウイ
ングの側端との間にステンレス鋼材を配置し、こ
のウイングの一対の開口側端を内方に折曲して溶
着することにより閉じたことを特徴とする原子炉
用制御棒。1. A control rod for a nuclear reactor having at least one rectangular stainless steel wing having a plurality of holes formed in the width direction and filled with a neutron absorbing material, the tip of the wing. The neutron absorbing material filled in at least one of the holes located at the side of the wing is replaced with a long-life neutron absorbing material, and the neutron absorbing material filled in the remaining holes is made of boron carbide, and the neutron absorbing material filled in the remaining holes is made of boron carbide. A long-life neutron absorber is disposed within the end portion along the length of the wing so as to close one end of the hole, and a stainless steel material is disposed between the long-life neutron absorber and the side edge of the wing. A control rod for a nuclear reactor, characterized in that the wings are closed by bending the open ends of the pair of wings inward and welding them together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58012680A JPS59138987A (en) | 1983-01-31 | 1983-01-31 | Control rod for reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58012680A JPS59138987A (en) | 1983-01-31 | 1983-01-31 | Control rod for reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59138987A JPS59138987A (en) | 1984-08-09 |
| JPH0549960B2 true JPH0549960B2 (en) | 1993-07-27 |
Family
ID=11812089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58012680A Granted JPS59138987A (en) | 1983-01-31 | 1983-01-31 | Control rod for reactor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59138987A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE444743B (en) * | 1984-09-03 | 1986-04-28 | Asea Atom Ab | Nuclear reactor control rod |
| JPS6171391A (en) * | 1984-09-17 | 1986-04-12 | 株式会社東芝 | Control rod for nuclear reactor |
| US4676948A (en) * | 1985-08-12 | 1987-06-30 | General Electric Company | Nuclear reactor control rod |
| US5034185A (en) * | 1988-02-09 | 1991-07-23 | Kabushiki Kaisha Toshiba | Control blade for nuclear reactor |
| JP2590202B2 (en) * | 1988-06-13 | 1997-03-12 | 株式会社東芝 | Control rod for nuclear reactor and method of manufacturing the same |
| FR2663776B1 (en) * | 1990-06-26 | 1994-03-25 | Toshiba Kk | CONTROL BAR AND BAR OF SUCH A BAR FOR A NUCLEAR REACTOR. |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50101794A (en) * | 1974-01-16 | 1975-08-12 | ||
| JPS5374697A (en) * | 1976-12-13 | 1978-07-03 | Nippon Atom Ind Group Co Ltd | Control rod |
-
1983
- 1983-01-31 JP JP58012680A patent/JPS59138987A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59138987A (en) | 1984-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0441797B2 (en) | ||
| JPH0549960B2 (en) | ||
| US3105807A (en) | Fuel elements for nuclear reactors | |
| JPS60161589A (en) | Control rod for reactor | |
| JPS6356958B2 (en) | ||
| JPS58147687A (en) | Control rod for reactor | |
| JPS59192992A (en) | Control rod of reactor | |
| JPS5855886A (en) | Control rod of reactor | |
| JPH0149915B2 (en) | ||
| JPH0961575A (en) | Control rod for nuclear reactor | |
| JPH01284796A (en) | Control rod for nuclear reactor | |
| JPH026037B2 (en) | ||
| JPH04177198A (en) | Control rod for reactor and its fabrication method | |
| JPH01284795A (en) | Control rod for nuclear reactor | |
| JPS60170790A (en) | Control rod for nuclear reactor | |
| JPH0117559B2 (en) | ||
| JP3080775B2 (en) | Reactor control rod | |
| JPH04128691A (en) | Control rod for nuclear reactor | |
| JPH022558B2 (en) | ||
| DE1439843B2 (en) | NUCLEAR REACTOR | |
| JPS6315194A (en) | Control rod for nuclear reactor | |
| JPH0469594A (en) | Control rod for nuclear reactor | |
| JPH0145598B2 (en) | ||
| JPH04106496A (en) | Nuclear reactor control rod | |
| JPS63271194A (en) | Control rod for nuclear reactor |