JPS63165797A - Control rod aggregate - Google Patents
Control rod aggregateInfo
- Publication number
- JPS63165797A JPS63165797A JP61309232A JP30923286A JPS63165797A JP S63165797 A JPS63165797 A JP S63165797A JP 61309232 A JP61309232 A JP 61309232A JP 30923286 A JP30923286 A JP 30923286A JP S63165797 A JPS63165797 A JP S63165797A
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- neutron absorber
- rod assembly
- pellet
- assembly according
- 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
- 239000006096 absorbing agent Substances 0.000 claims description 37
- 239000008188 pellet Substances 0.000 claims description 33
- 230000004323 axial length Effects 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 12
- 238000005253 cladding Methods 0.000 claims description 8
- 229910052580 B4C Inorganic materials 0.000 claims description 5
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052735 hafnium Inorganic materials 0.000 claims description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000008961 swelling Effects 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
- Crystals, And After-Treatments Of Crystals (AREA)
- Crushing And Grinding (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は高速増殖炉に用いられる制御棒集合体に関する
。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a control rod assembly used in a fast breeder reactor.
（従来の技術）
液体金属ナトリウム等の液体金属を冷却材とする高速増
殖炉には第６図に示す制御棒集合体１が設けられている
。この制御棒集合体１は制御棒案内管２内に昇降自在に
収容された制御棒３を備え、制御棒３内に多数の制御要
素４が収納される。(Prior Art) A fast breeder reactor using liquid metal such as liquid metal sodium as a coolant is provided with a control rod assembly 1 shown in FIG. 6. This control rod assembly 1 includes a control rod 3 housed in a control rod guide tube 2 so as to be able to rise and fall freely, and a large number of control elements 4 are housed within the control rod 3.
各制御要素４は、第７図に示すように、ステンレス鋼製
被覆管５内にペレット状に成形したボロンカーバイド（
Ｂ４Ｃ）等の中性子吸収材６が充填されている。中性子
吸収材６のペレットはスペーサ７を介して上部プレナム
８内に収容された押圧スプリング９で押圧され、原子炉
のスクラム時や制御棒輸送時に中性子吸収材６が移動し
ないように保持している。被覆管５の上下端部には端栓
１０が溶接等により固着される。As shown in FIG. 7, each control element 4 consists of boron carbide (
A neutron absorbing material 6 such as B4C) is filled. The pellets of the neutron absorbing material 6 are pressed by a pressing spring 9 housed in the upper plenum 8 via a spacer 7, and are held so that the neutron absorbing material 6 does not move during reactor scram or control rod transportation. . End plugs 10 are fixed to the upper and lower ends of the cladding tube 5 by welding or the like.
Ｉｌｌ ｔＩＩ棒集合体１は高速増殖炉の炉心部に出し
入れ自在に設置されるため、制御棒案内管２は中性子照
射によるスウェリング差や温度差に起因する熱ｉｉ差に
より、第８図に示すようにボーイング現象が発生し、制
御棒案内管２は炉心部の放射方向側に向って湾曲する。Since the Ill tII rod assembly 1 is installed in the core of the fast breeder reactor so that it can be moved in and out, the control rod guide tube 2 is heated as shown in FIG. A bowing phenomenon occurs, and the control rod guide tubes 2 curve toward the radial direction of the reactor core.
このボーイング現象発生環境下においても、スクラム時
には中性子吸収機能を満足させるために制御棒３を急速
落下させる必要がある。Even under this environment where the bowing phenomenon occurs, it is necessary to rapidly drop the control rod 3 in order to satisfy the neutron absorption function during scram.
この制御棒３の落下挿入時にボーイングした制御棒案内
管２内に無理なくスムーズに落下させるために、制御棒
３の流動圧力損失を小さくして落下抵抗を小さくする必
要があり、このため制御棒３は大径部の軸方向長さを短
くすることが望まれている。In order to allow the control rod 3 to fall smoothly into the bowed control rod guide tube 2 when it is dropped and inserted, it is necessary to reduce the flow pressure loss of the control rod 3 and reduce the falling resistance. 3, it is desired to shorten the axial length of the large diameter portion.
（発明が解決しようとする問題点）
制御棒３の太径部の軸方向長さしを短くすることは、制
御棒３内に収納される複数の制御要素４の軸方向長さを
短くすることであるが、従来の制御棒３は炉心部に挿入
されたとき、第７図に示すように制ｍ要素４の中性子吸
収体６を炉心部に、押圧スプリング９を炉心部外に配コ
する寸法関係に設定されていたので、制御要素４の軸方
向長さが長くなり、制御棒３の大径部の軸方向長ざＬを
短くすることが困難であった。(Problem to be Solved by the Invention) Shortening the axial length of the large diameter portion of the control rod 3 shortens the axial length of the plurality of control elements 4 housed within the control rod 3. However, when the conventional control rod 3 is inserted into the reactor core, as shown in FIG. As a result, the axial length of the control element 4 becomes long, making it difficult to shorten the axial length L of the large diameter portion of the control rod 3.
本発明は上述した事情を考慮してなされたもので、制御
棒要素の軸方向長さを短くして制御棒太径部の軸方向長
さを短縮し、制御棒の挿入性を改善し、信頼性を向上さ
せた制御棒集合体を提供することを目的とする。The present invention has been made in consideration of the above-mentioned circumstances, and includes shortening the axial length of the control rod element to shorten the axial length of the large diameter portion of the control rod, thereby improving the ease of inserting the control rod. The purpose is to provide a control rod assembly with improved reliability.
（問題点を解決するための手段）
本発明に係る制御棒集合体は、制御棒内に複数の制御要
素を収納し、上記制御要素は被覆管の両端を端栓で固着
し、内部に中性子吸収体とこの中性子吸収体を抑える押
圧スプリングを収容した制御棒集合体において、上記中
性子吸収体は上端部に小径部を形成し、この小径部を押
圧スプリング内に収納したものである。(Means for Solving the Problems) A control rod assembly according to the present invention houses a plurality of control elements in a control rod, and the control elements have both ends of a cladding tube fixed with end plugs, and a neutron In a control rod assembly that accommodates an absorber and a pressure spring that suppresses the neutron absorber, the neutron absorber has a small diameter portion formed at its upper end, and this small diameter portion is housed within the pressure spring.
（作用）
このｆ、ＩＪ ｔｉｌｌ棒集合体は制御棒内に収納され
る複数のＩＩＩ ＩＩＩ ｌ葉内に中性子吸収体と押圧
スプリングを収容し、上記中性子吸収体は上端部に小径
部を形成し、この小径部を押圧スプリング内に収納した
ので、中性子吸収体の小径部と押圧スプリングの重なり
分だけ制御要素の軸方向長さを短くすることができ、制
御棒太径部の軸方向長さを短くすることができる。(Function) This f, IJ till rod assembly houses a neutron absorber and a pressing spring in a plurality of III leaves housed in the control rod, and the neutron absorber forms a small diameter part at the upper end. Since this small diameter part is housed within the pressure spring, the axial length of the control element can be shortened by the overlap between the small diameter part of the neutron absorber and the pressure spring, and the axial length of the large diameter part of the control rod can be shortened by the overlap between the small diameter part of the neutron absorber and the pressure spring. can be shortened.
制御棒大径部の軸方向長さを短くしても、中性子吸収体
の中性子吸収有効長さは従来と同様でよく、中性子吸収
効率の劣化を招くことはない。Even if the axial length of the large diameter portion of the control rod is shortened, the effective neutron absorption length of the neutron absorber may remain the same as in the past, and the neutron absorption efficiency will not deteriorate.
（実施例）
以下、本発明に係る制御棒集合体の一実施例について添
付図面を参照して説明する。(Example) Hereinafter, an example of a control rod assembly according to the present invention will be described with reference to the accompanying drawings.
本発明に係る制御棒集合体において、高速増殖炉の炉心
部に装荷される制御棒案内管や制御棒案内管内を出し入
れ自在に挿入される制御棒の配置構成は従来の制御棒集
合体と異ならないので説明を省略する。In the control rod assembly according to the present invention, the arrangement of the control rod guide tube loaded in the core of a fast breeder reactor and the control rods inserted into and out of the control rod guide tube is different from that of conventional control rod assemblies. Since this is not the case, the explanation will be omitted.
この制御棒集合体は制御棒内に複数の制御要素１１が収
納される。各制御！Ｉ！要素１１は第１図に示すように
ステンレスｔｌｔＪ被覆管１２内にボロンカーバイド等
の中性子吸収体１３が収容される。中性子吸収体１３は
例えばボロンカーバイドの粉末をペレット状に焼結し、
このペレット１３ａ、１３ｂを複数個８！ｉ層して構成
される。被覆管１２内に収納された中性子吸収体１３の
ペレット１３ａ。In this control rod assembly, a plurality of control elements 11 are housed within the control rod. Each control! I! As shown in FIG. 1, the element 11 houses a neutron absorber 13 such as boron carbide in a stainless steel TLTJ cladding tube 12. The neutron absorber 13 is made by sintering boron carbide powder into pellets, for example.
Plural 8 of these pellets 13a, 13b! It is composed of i-layers. Pellets 13a of the neutron absorber 13 housed in the cladding tube 12.
１３ｂは上部ブレナム１５に収容された押圧スプリング
１６で押圧され、保持される。被覆管１２の上下端は端
栓１７ａ、１７ｂが溶接等により固着され、封止される
。13b is pressed and held by a pressing spring 16 housed in the upper blenheim 15. The upper and lower ends of the cladding tube 12 are sealed with end plugs 17a and 17b fixed by welding or the like.
一方、被覆管１２内に収納された中性子吸収体１３のペ
レット１３ａ、１３ｂは、高速増殖炉の炉心高さに相当
する中性子吸収有効長さオを有し、積層された各ペレッ
トのうち最上部のペレツ１３ｂは上端部に小径部１８が
形成される。この小径部１８は抑圧スプリング１６内に
収納され、ペレット小径部１８の軸方向長さｍに等しい
重なり部が形成される。On the other hand, the pellets 13a and 13b of the neutron absorber 13 housed in the cladding tube 12 have an effective neutron absorption length O corresponding to the core height of the fast breeder reactor, and A small diameter portion 18 is formed at the upper end of the pellet 13b. This small diameter portion 18 is accommodated within the suppression spring 16, and an overlapping portion equal to the axial length m of the pellet small diameter portion 18 is formed.
ペレット小径部１８と抑圧スプリング１６との間に長さ
ｍの重なり部を形成することにより、その分だけ制御要
素１１の軸方向長さを短くすることができる。このペレ
ット小径部１８の長ざｍは、製作公差上の余裕等を考慮
し、押圧スプリング１６の密着長さく最大圧縮時の軸方
向長さ）より短く成形され、スウェリング等により中性
子吸収体１３が膨張し延びても、中性子吸収体１３が上
部端栓１７ａに当らないように考慮されている。By forming an overlapping portion of length m between the pellet small diameter portion 18 and the suppression spring 16, the axial length of the control element 11 can be shortened by that amount. The length m of this pellet small diameter portion 18 is formed shorter than the length of the press spring 16 in close contact (the length in the axial direction at maximum compression), taking into account allowances for manufacturing tolerances, etc., and the length m of the neutron absorber 18 is Even if the neutron absorber 13 expands and extends, it is designed to prevent the neutron absorber 13 from hitting the upper end plug 17a.
次に、制御棒集合体の作用を説明する。Next, the operation of the control rod assembly will be explained.
この制御棒集合体は制御棒内に収納される制御要素１１
を第１図に示すように構成し、内部に収容される中性子
吸収体１３の上端部のペレット１３ｂに小径部１８を形
成し、この小径部１８を押圧スプリング１６内に収納し
たので、ペレット小径部１８の軸方向長さｍに相当する
重なり部が形成され、その分だけ１ＩＩｌｔ１１要素１
１の軸方向長さを従来より短くすることができる。This control rod assembly consists of control elements 11 housed within the control rods.
The pellet 13b at the upper end of the neutron absorber 13 accommodated therein is formed with a small diameter part 18, and this small diameter part 18 is housed in the pressing spring 16, so that the pellet has a small diameter. An overlapping portion corresponding to the axial length m of the portion 18 is formed, and 1IIlt11 element 1 is formed by that amount.
1 can be made shorter than before.
制御要素１１の軸方向長さを短くすることができること
により制御棒太径部の軸方向長さを短くできる。したが
って、制御棒案内管が中性子照射によるスウェリング差
や温度差に起因する熱膨張差によりボーイングし、湾曲
しても、上記制御棒案内管内に制御棒をスムーズに案内
し、急速落下挿入させることができる。Since the axial length of the control element 11 can be shortened, the axial length of the large diameter portion of the control rod can be shortened. Therefore, even if the control rod guide tube bows and curves due to the swelling difference caused by neutron irradiation or the thermal expansion difference caused by the temperature difference, the control rod can be smoothly guided into the control rod guide tube and inserted rapidly. I can do it.
すなわち、この制御棒は制御要素１１を従来より短くで
きるので、制御棒太径部の軸方向長さが短くなり、流動
圧力損失を小さくすることができ、かつ制御棒案内管の
ボーイングに対する挿入性が良好となる。このため、制
御棒の主機能である急速落下性能を向上させることがで
き、信頼性の大きな制御棒集合体を提供できる。That is, in this control rod, the control element 11 can be made shorter than before, so the axial length of the large diameter part of the control rod is shortened, the flow pressure loss can be reduced, and the insertability of the control rod guide tube into the bowing is improved. becomes good. Therefore, the rapid fall performance, which is the main function of the control rod, can be improved, and a highly reliable control rod assembly can be provided.
第２図はυ制御棒集合体の制御棒内に組み込まれる制ｗ
Ｊ要素１１Ａの第１変形例を示すものである。Figure 2 shows the controls w incorporated into the control rods of the υ control rod assembly.
This shows a first modification of the J element 11A.
この変形例に示された制御要素１１Ａは、中性子吸収体
１３の上端部のペレット１３ｂに形成された小径部１８
に全体としてハツト状をなすフランジ付スリーブ２０を
嵌挿し、このスリーブ２０のフランジ２０８をば論座と
して構成する一方、スリーブ２０で上端ペレット１３ｂ
の小径部１Ｂが破損したとき、その破片が抑圧スプリン
グ１６のスプリング線間に入り込むのを防止したもので
ある。したがって、ペレット小径部１８が破損しても、
破片が押圧スプリング１６に入り込んでスプリング密着
長さを大きくするのを防止でき、抑圧スプリング１６の
スプリング償能の劣化を防ぐことができる。The control element 11A shown in this modification has a small diameter portion 18 formed in the pellet 13b at the upper end of the neutron absorber 13.
A flanged sleeve 20 having a hat-like shape as a whole is fitted into the sleeve 20, and the flange 208 of this sleeve 20 is configured as a spring plate.
This prevents fragments from entering between the spring lines of the suppression spring 16 when the small diameter portion 1B of the spring is damaged. Therefore, even if the pellet small diameter portion 18 is damaged,
It is possible to prevent debris from entering the pressing spring 16 and increasing the length of the spring's close contact, and it is possible to prevent deterioration of the spring compensability of the suppressing spring 16.
第３図は制ｍＩ！素１１Ｂの第２変形例を示すものであ
り、この変形例に示された制御要素１１Ｂはフランジ付
スリーブ２１の頂部を開口させ、スリーブ２１の装着性
を改善したものであり、この場合にも第１変形例と同様
な効果を有する。Figure 3 shows control mI! This shows a second modification of the element 11B, and the control element 11B shown in this modification has the top of the flanged sleeve 21 opened to improve the ease of mounting the sleeve 21. It has the same effect as the first modification.
また、第４図にｔ／Ｉ＠要素１１Ｃの第３変形例を示す
。Further, FIG. 4 shows a third modification of the t/I@ element 11C.
この変形例に示された制御要素１１Ｇは中性子吸収体の
上端ペレット１３ｂの小径部１８をフランジなしスリー
ブ２２で嵌挿させたものである。The control element 11G shown in this modification has a flangeless sleeve 22 fitted into the small diameter portion 18 of the upper end pellet 13b of the neutron absorber.
この場合にも、第１変形例で示した制御要素１１Ａと小
径部１８の破損に対し同等の効果を秦する。In this case as well, the same effect on damage to the control element 11A and the small diameter portion 18 as shown in the first modification is achieved.
さらに、制御要素１１Ｄ、１１Ｅを第５図（Ａ）および
（８）に示すように構成し、中性子吸収体１３の上端ペ
レット１３Ｇを他のペレット１３ａより小径に形成し、
制御棒の急速落下時に小径ペレット１３Ｃが踊るのを防
止するため、押圧スプリング１６内に細径の抑えスプリ
ング２４を設けてもよい。第５図（Ｂ）は小径ペレット
１３ｃに７ランジ付スリーブ２５を嵌挿させたものであ
る。Furthermore, the control elements 11D and 11E are configured as shown in FIGS. 5(A) and (8), and the upper end pellet 13G of the neutron absorber 13 is formed to have a smaller diameter than the other pellets 13a,
In order to prevent the small diameter pellets 13C from dancing when the control rod rapidly falls, a small diameter restraining spring 24 may be provided within the pressing spring 16. FIG. 5(B) shows a small-diameter pellet 13c in which a sleeve 25 with seven flanges is fitted.
このフランジ付スリーブ２５に代えて第２図および第４
図に示されるスリーブを採用してもよい。2 and 4 instead of this flanged sleeve 25.
The sleeve shown in the figure may also be employed.
なお、本発明の詳細な説明では、制御要素の被覆管内に
収容される中性子吸収体は、８４Ｃ等の焼結ペレットで
形成される例について説明したが、中性子吸収体はハフ
ニウム（Ｈｆ）等の金属製中性子吸収体をペレット状に
しても、あるいは金ｆｆｌ製中性子吸収棒状に形成して
もよい。In the detailed description of the present invention, the neutron absorber accommodated in the cladding tube of the control element was described as an example formed of sintered pellets such as 84C, but the neutron absorber may be made of sintered pellets such as hafnium (Hf). The metal neutron absorber may be formed into a pellet shape or a gold ffl neutron absorbing rod shape.
また、制御棒は一実施例で説明したものに限定されず、
軸方向に数分割された制御棒エレメントを相互にジヨイ
ントした分節型制御棒であっても、クラスタ型制御棒で
あってもよい。Further, the control rod is not limited to that described in one embodiment,
The control rod may be a segmented control rod in which control rod elements divided into several parts in the axial direction are mutually jointed, or a cluster control rod may be used.
以上に述べたように本発明に係る制御棒集合体において
は、制御要素内に収容される中性子吸収体はその上端部
に小径部を形成し、この小径部を押圧スプリング内に収
納したから、中性子吸収体の小径部と抑圧スプリングと
の間に重なり部を形成し、その分だけ制御要素の軸方向
長さを短くすることができ、制御棒太径部の軸方向長さ
を短縮して流動圧力損失を小さくすることができるので
、制御棒の挿入性が向上し、信頼性の高い制御棒集合体
を提供することができる。As described above, in the control rod assembly according to the present invention, the neutron absorber housed in the control element has a small diameter part formed at its upper end, and this small diameter part is housed in the pressing spring. By forming an overlapping part between the small diameter part of the neutron absorber and the suppression spring, the axial length of the control element can be shortened by that amount, and the axial length of the large diameter part of the control rod can be shortened. Since flow pressure loss can be reduced, insertability of control rods is improved, and a highly reliable control rod assembly can be provided.
第１図は本発明に係る制御棒集合体の一実施例を示す制
御要素の縦断面図、第２図〜第４図は上記制御要素の第
１変形例から第３変形例をそれぞれ示す部分的断面図、
第５図（Ａ）および（Ｂ）は制ｍ＋要素の第４および第
５変形例を示す部分的断面図、第６図は従来の制御棒集
合体を示す断面図、第７図は従来の１ＩｌｌｔＩｌ棒に
収納されるυＪＩＩＩ要素の縦断面図、第８図は制御棒
集合体の制御棒案内管のボーイング現象を示す図である
。
１・・・制御棒集合体、２・・・制御棒案内管、３・・
・制御棒、１１．ＩＩＡ〜１１Ｅ・・・制御要素、１２
・・・被覆管、１３・・・中性子吸収体、１３ａ、１３
ｂ・・・ペレット、１３Ｇ・・・小径ペレット、１５・
・・上部ブレナム、１６・・・押圧スプリング、１７ａ
、１７ｂ・・・端栓、１８・・・小径部、２０．２１，
２２．２５・・・スリーブ。
出願人代理人 波 多 野 久羊ｆ回
第９図
芋８旨FIG. 1 is a longitudinal sectional view of a control element showing one embodiment of a control rod assembly according to the present invention, and FIGS. 2 to 4 are sections showing first to third modifications of the control element, respectively. sectional view,
5(A) and 5(B) are partial cross-sectional views showing fourth and fifth modified examples of the control m+ element, FIG. 6 is a cross-sectional view showing a conventional control rod assembly, and FIG. 7 is a partial cross-sectional view showing a conventional control rod assembly. FIG. 8 is a vertical cross-sectional view of the υJIII element housed in the 1IlltIl rod, and is a diagram showing the bowing phenomenon of the control rod guide tube of the control rod assembly. 1... Control rod assembly, 2... Control rod guide tube, 3...
・Control rod, 11. IIA-11E...control element, 12
...Claying tube, 13...Neutron absorber, 13a, 13
b...Pellet, 13G...Small diameter pellet, 15.
・Upper Blenheim, 16 ・Press spring, 17a
, 17b... end plug, 18... small diameter part, 20.21,
22.25...Sleeve. Applicant's agent Hisashi Hata No. 9, Imo 8
Claims (1)
は被覆管の両端を端栓で固着し、内部に中性子吸収体と
この中性子吸収体を抑える押圧スプリングを収容した制
御棒集合体において、上記中性子吸収体は上端部に小径
部を形成し、この小径部を押圧スプリング内に収納した
ことを特徴とする制御棒集合体。 ２、中性子吸収体はボロンカーバイド等を焼結して成形
されるペレットを複数個積層して形成された特許請求の
範囲第１項に記載の制御棒集合体。 ３、中性子吸収体は上端部のペレットの上部に小径部を
部分的に形成した特許請求の範囲第２項に記載の制御棒
集合体。 ４、中性子吸収体の上端部ペレットの小径部にスリーブ
が外側から被着された特許請求の範囲第３項に記載の制
御棒集合体。 ５、中性子吸収体の上端部ペレットの小径部は押圧スプ
リングのスプリング密着長さより短い軸方向長さを有す
る特許請求の範囲第３項に記載の制御棒集合体。 ６、中性子吸収体は上端部のペレットを他のペレットよ
り小径に成形した特許請求の範囲第２項に記載の制御棒
集合体。 ７、中性子吸収体は上端部の小径ペレットが押圧スプリ
ング内に収容された抑えスプリングに係合し、小径ペレ
ットの浮上りを防止した特許請求の範囲第５項に記載の
制御棒集合体。 ８、中性子吸収体の上端部小径ペレットは外側からスリ
ーブで被着された特許請求の範囲第５項に記載の制御棒
集合体。 ９、中性子吸収体の上端部小径ペレットは押圧スプリン
グのスプリング密着長さより短い軸方向長さを有する特
許請求の範囲第６項に記載の制御棒集合体。 １０、中性子吸収体はハフニウム等の金属製中性子吸収
棒である特許請求の範囲第１項に記載の制御棒集合体。[Claims] 1. A plurality of control elements are housed in a control rod, each of which has a cladding tube fixed at both ends with end plugs, and has a neutron absorber inside and a pressing spring that suppresses the neutron absorber. A control rod assembly accommodated in the control rod assembly, wherein the neutron absorber has a small diameter portion formed at an upper end thereof, and the small diameter portion is housed within a pressing spring. 2. The control rod assembly according to claim 1, wherein the neutron absorber is formed by stacking a plurality of pellets formed by sintering boron carbide or the like. 3. The control rod assembly according to claim 2, wherein the neutron absorber has a small diameter portion partially formed above the pellet at the upper end. 4. The control rod assembly according to claim 3, wherein a sleeve is attached to the small diameter portion of the upper end pellet of the neutron absorber from the outside. 5. The control rod assembly according to claim 3, wherein the small diameter portion of the upper end pellet of the neutron absorber has an axial length shorter than the spring contact length of the pressing spring. 6. The control rod assembly according to claim 2, wherein the upper end pellet of the neutron absorber is formed to have a smaller diameter than other pellets. 7. The control rod assembly according to claim 5, wherein the small-diameter pellet at the upper end of the neutron absorber engages with a restraining spring housed in a pressing spring to prevent the small-diameter pellet from floating. 8. The control rod assembly according to claim 5, wherein the small-diameter pellet at the upper end of the neutron absorber is covered with a sleeve from the outside. 9. The control rod assembly according to claim 6, wherein the small-diameter pellet at the upper end of the neutron absorber has an axial length shorter than the spring contact length of the pressing spring. 10. The control rod assembly according to claim 1, wherein the neutron absorber is a neutron absorbing rod made of metal such as hafnium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61309232A JPS63165797A (en) | 1986-12-27 | 1986-12-27 | Control rod aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61309232A JPS63165797A (en) | 1986-12-27 | 1986-12-27 | Control rod aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63165797A true JPS63165797A (en) | 1988-07-09 |
Family
ID=17990519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61309232A Pending JPS63165797A (en) | 1986-12-27 | 1986-12-27 | Control rod aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63165797A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6411668B1 (en) * | 1997-02-12 | 2002-06-25 | Compagnie Europeenne Du Zirconium-Cezus | Guide tube of a nuclear reactor fuel assembly |
-
1986
- 1986-12-27 JP JP61309232A patent/JPS63165797A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6411668B1 (en) * | 1997-02-12 | 2002-06-25 | Compagnie Europeenne Du Zirconium-Cezus | Guide tube of a nuclear reactor fuel assembly |
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