JPH0514236Y2 - - Google Patents
Info
- Publication number
- JPH0514236Y2 JPH0514236Y2 JP1985142198U JP14219885U JPH0514236Y2 JP H0514236 Y2 JPH0514236 Y2 JP H0514236Y2 JP 1985142198 U JP1985142198 U JP 1985142198U JP 14219885 U JP14219885 U JP 14219885U JP H0514236 Y2 JPH0514236 Y2 JP H0514236Y2
- Authority
- JP
- Japan
- Prior art keywords
- burnable poison
- poison rod
- cap nut
- protrusion
- end plate
- 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
- 239000002574 poison Substances 0.000 claims description 38
- 231100000614 poison Toxicity 0.000 claims description 38
- 238000003466 welding Methods 0.000 description 18
- 230000009257 reactivity Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- -1 control rods Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 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
- Reinforcement Elements For Buildings (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【考案の詳細な説明】
「産業上の利用分野」
本考案は、ホールドダウンアセンブリーの下部
に設けられた端板にバーナブルポイズン棒を取付
けてなるバーナブルポイズン棒集合体に関する。[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a burnable poison rod assembly in which a burnable poison rod is attached to an end plate provided at the bottom of a hold-down assembly.
「従来の技術」
原子炉においては、燃料の燃焼度、炉心の温度
上昇、燃料の燃えカス中のキセノン、サマリウム
の毒作用、出力レベルの変動等を考慮して固有の
実効増倍率を１より大きくとつている。しかしな
がら、実効増倍率を１より大きくすると、このま
までは超過反応度を示し、急激に出力が大きくな
つて好ましくない。そこで、この超過反応度を打
ち消し、さらに安全性を保つために原子炉を停止
させる負の反応作用体を用意しておく必要があ
る。この負の反応作用体としては、一般に中性子
吸収材、すなわち、制御棒、液体吸収材（ケミカ
ルシム）、バーナブルポイズン（可燃性毒物）が
用いられている。そして、原子炉においては、上
記超過反応度を制御棒、ケミカルシム、またはバ
ーナブルポイズンで抑えておき、徐々に制御棒を
炉心から引き抜きながら、あるいはケミカルシム
またはバーナブルポイズンを燃焼させて、炉心の
臨界状態を保つようにしている。``Conventional technology'' In nuclear reactors, the inherent effective multiplication factor is determined from 1 by taking into consideration factors such as fuel burnup, core temperature rise, toxic effects of xenon and samarium in the fuel burnt residue, and fluctuations in output level. It's getting bigger. However, if the effective multiplication factor is made larger than 1, excessive reactivity will be exhibited and the output will suddenly increase, which is not preferable. Therefore, in order to counteract this excess reactivity and further maintain safety, it is necessary to prepare a negative reaction agent that shuts down the reactor. Neutron absorbers, such as control rods, liquid absorbers (chemical shims), and burnable poisons are generally used as negative reaction agents. In a nuclear reactor, the excess reactivity is suppressed using control rods, chemical shims, or burnable poison, and the control rods are gradually withdrawn from the reactor core, or the chemical shims or burnable poisons are burned to remove the excess reactivity from the reactor core. We try to maintain the critical state of .
ところで、上記バーナブルポイズンを使用する
には、第２図ないし第５図に示すように、数本の
長尺なバーナブルポイズン棒１の上端のねじ部２
をホールドダウンアセンブリー３の下端に設けら
れた端板４の孔部に挿入してナツト５により螺着
し、さらに上記ねじ部２の上端部に形成された溝
部６にピン７を装着して、該ピン７の両端部をナ
ツト５に溶着することにより、ナツト５とねじ部
２とを固定してバーナブルポイズン棒集合体（可
燃性毒物棒集合体）を構成している。上記バーナ
ブルポイズン棒１は、第４図に示すように、ステ
ンレス鋼管８の中にスペーサ９及びほう珪酸ガラ
ス１０を収容し、ステンレス鋼管８の上下部に端
栓１１，１２を溶接して密封したものであり、炉
心内の指定された燃料集合体の制御棒案内シンブ
ルに挿入される。 By the way, in order to use the above-mentioned burnable poison, as shown in Figs.
is inserted into the hole of the end plate 4 provided at the lower end of the hold-down assembly 3 and screwed with the nut 5, and the pin 7 is fitted into the groove 6 formed at the upper end of the threaded part 2. By welding both ends of the pin 7 to the nut 5, the nut 5 and the threaded portion 2 are fixed to form a burnable poison rod assembly. As shown in FIG. 4, the burnable poison rod 1 has a spacer 9 and borosilicate glass 10 housed in a stainless steel tube 8, and end plugs 11 and 12 are welded to the upper and lower parts of the stainless steel tube 8 to seal it. It is inserted into the control rod guide thimble of a designated fuel assembly in the reactor core.
「考案が解決しようとする問題点」
しかしながら、上記従来のバーナブルポイズン
棒集合体にあつては、上記ピン７の両端部をナツ
ト５に溶接する場合に、ピン７の向きが一定でな
いため、溶接箇所を特定しにくく、自動化しにく
いという問題がある。"Problems to be Solved by the Invention" However, in the conventional burnable poison rod assembly described above, when both ends of the pin 7 are welded to the nut 5, the orientation of the pin 7 is not constant. There are problems in that it is difficult to identify the welding location and difficult to automate.
また、特開昭56−111491号公報には、上記ナツ
トをねじ部に直接溶接するようにした技術が開示
されている。 Furthermore, Japanese Patent Application Laid-Open No. 111491/1983 discloses a technique in which the above-mentioned nut is directly welded to the threaded portion.
しかしながら、この技術によつても、つぎによ
うな不具合が想定される。 However, even with this technique, the following problems are expected.
すなわち、ねじ部とナツトとを直接溶接する場
合、ねじ部の表面は凹凸形状となされていること
から、溶接ビードの形状が不安定になりやすく、
溶接が不均一になつてしまうことが想定される。 In other words, when directly welding a threaded part and a nut, the surface of the threaded part is uneven, so the shape of the weld bead tends to become unstable.
It is assumed that welding will become uneven.
本考案は、上記事情に鑑みてなされたもので、
その目的とするところは、構造が簡単でかつナツ
トとねじ部との溶接時の位置決めを行ない易く、
溶接を容易に自動化できるバーナブルポイズン棒
集合体を提供することにある。 This invention was made in view of the above circumstances,
The purpose is to have a simple structure and to make it easy to position the nut and thread when welding.
An object of the present invention is to provide a burnable poison rod assembly that can easily automate welding.
「問題点を解決するための手段」
上記目的を達成するために、本考案は、バーナ
ブルポイズン棒の上端のねじ部の先端中心部に突
起を設け、かつ該ねじ部に螺合する袋ナツトの中
心部に小孔を貫通して形成し、上記突起と袋ナツ
トとを溶接したものである。"Means for solving the problem" In order to achieve the above object, the present invention provides a protrusion at the center of the tip of the threaded part at the upper end of the burnable poison rod, and a cap nut that is screwed into the threaded part. A small hole is formed through the center of the protrusion, and the protrusion and the cap nut are welded together.
「作用」
本考案のバーナブルポイズン棒集合体にあつて
は、端板を貫通したバーナブルポイズン棒の上端
のねじ部に袋ナツトを螺合して、端板にバーナブ
ルポイズン棒を取付ける際に、ねじ部に設けた突
起を袋ナツトに形成した小孔に嵌め合わせ、該突
起と袋ナツトとを溶接等で固着する。"Function" In the case of the burnable poison rod assembly of the present invention, when attaching the burnable poison rod to the end plate, a cap nut is screwed onto the threaded portion at the upper end of the burnable poison rod passing through the end plate. Next, the protrusion provided on the threaded portion is fitted into the small hole formed in the cap nut, and the protrusion and the cap nut are fixed by welding or the like.
「実施例」
以下、第１図に基づいて本考案の一実施例を説
明する。なお、本実施例において上記従来例と同
様な部分には同一符号を付してその説明を省略す
る。"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIG. 1. Incidentally, in this embodiment, the same parts as those in the above conventional example are given the same reference numerals, and the explanation thereof will be omitted.
第１図は本考案に係るバーナブルポイズン棒集
合体Ａの端板４の部分を示す側面図であり、この
図に示すバーナブルポイズン棒集合体Ａにおいて
上記従来例と異なるのは、バーナブルポイズン棒
２０のねじ部２１の構造及び袋ナツト２２の構造
である。すなわち、このバーナブルポイズン棒集
合体Ａにおけるバーナブルポイズン棒２０は、そ
の上端部にねじ部２１が形成され、かつ該ねじ部
２１の上端中心部に円柱状の突起２８が形成され
たものである。また、上記バーナブルポイズン棒
２０の上端部は、ホールドダウンアセンブリーの
下部に設けられた端板４を貫通して、上方に突出
して設けられている。そして、この端板４から突
出したバーナブルポイズン棒２０の上端のねじ部
２１には、上記袋ナツト２２が、その中心部に形
成した小孔２４に上記突起２３を嵌め合わせた状
態で螺合されており、この袋ナツト２２により端
板４にバーナブルポイズン棒２０が取付けられて
いる。さらに、袋ナツト２２の小孔２４から突出
した上記突起２３と袋ナツト２２とは、溶接によ
つて固着されている。 FIG. 1 is a side view showing the end plate 4 of the burnable poison rod assembly A according to the present invention. These are the structure of the threaded portion 21 of the poison rod 20 and the structure of the cap nut 22. That is, the burnable poison rod 20 in this burnable poison rod assembly A has a threaded portion 21 formed at its upper end, and a cylindrical projection 28 formed at the center of the upper end of the threaded portion 21. be. Further, the upper end portion of the burnable poison rod 20 is provided so as to pass through an end plate 4 provided at the lower part of the hold down assembly and protrude upward. The cap nut 22 is screwed onto the threaded portion 21 at the upper end of the burnable poison rod 20 protruding from the end plate 4 with the protrusion 23 fitted into a small hole 24 formed in the center thereof. A burnable poison rod 20 is attached to the end plate 4 using this cap nut 22. Further, the protrusion 23 protruding from the small hole 24 of the cap nut 22 and the cap nut 22 are fixed by welding.
上記のように構成されたバーナブルポイズン棒
集合体Ａにあつては、端板４にバーナブルポイズ
ン棒２０を取付ける場合に、端板４の孔にバーナ
ブルポイズン棒２０の上端部を挿通し、端板４の
上方に突出したバーナブルポイズン棒２０のねじ
部２１に袋ナツト２２を螺合した後、袋ナツト２
２の小孔２４に嵌め合つたねじ部２１の突起２３
と該袋ナツト２２とを溶接により固着すればよ
い。この場合に、溶接箇所は、上記突起２３と袋
ナツト２２の小孔２４の周囲部分との間の一箇所
だけになり、しかもねじ部２１（袋ナツト２２）
の中心部を溶接すればよいので、溶接時の位置決
めが容易となる。従つて、溶接作業が行ない易
く、自動化が簡単に実現できる上に、従来のよう
にピン７を使用する必要がないため、構造が単純
になり、コスト低減を図ることができる。 In the burnable poison rod assembly A configured as described above, when attaching the burnable poison rod 20 to the end plate 4, the upper end of the burnable poison rod 20 is inserted into the hole of the end plate 4. After screwing the cap nut 22 onto the threaded portion 21 of the burnable poison rod 20 protruding above the end plate 4, the cap nut 2
The protrusion 23 of the threaded portion 21 that fits into the small hole 24 of No. 2
and the cap nut 22 may be fixed by welding. In this case, the welding location is only one location between the protrusion 23 and the area around the small hole 24 of the cap nut 22, and moreover, the welding location is only one location between the protrusion 23 and the area around the small hole 24 of the cap nut 22.
Since it is only necessary to weld the center part of the part, positioning during welding becomes easy. Therefore, welding work is easy to perform, automation can be easily realized, and there is no need to use the pin 7 as in the conventional case, so the structure is simple and costs can be reduced.
しかも、突起２３の表面と袋ナツト２２の表面
とを溶接するものであるから、溶接部分がほぼ均
一な曲率であることから、均一な溶接が行なわれ
る。 Moreover, since the surface of the protrusion 23 and the surface of the cap nut 22 are welded, the welded portion has a substantially uniform curvature, so that uniform welding can be performed.
「考案の効果」
以上説明したように、本考案によれば、バーナ
ブルポイズン棒の上端のねじ部の先端中心部に突
起を設け、かつ該ねじ部に螺合する袋ナツトの中
心部に小孔を形成し、端板を貫通したバーナブル
ポイズン棒の上端のねじ部に袋ナツトを螺合し
て、端板にバーナブルポイズン棒を取付ける際
に、ねじ部に設けた突起を袋ナツトに形成した小
孔に嵌め合わせて、該突起と袋ナツトとを溶接等
により固着することにより、ナツトとねじ部との
固着時の位置決めを行ない易く、溶接等の固着作
業を容易に自動化できる上に、構造が簡単で安価
に製作でき、しかも、溶接部分の表面が円滑な曲
率を有する面であることから、均一な溶接が可能
となり、確実な溶接を行なうことができる。とい
う優れた効果を有する。"Effect of the invention" As explained above, according to the invention, a protrusion is provided at the center of the tip of the threaded part at the upper end of the burnable poison rod, and a small When attaching the burnable poison rod to the end plate by forming a hole and screwing the cap nut onto the threaded portion of the upper end of the burnable poison rod that has passed through the end plate, insert the protrusion provided on the threaded portion into the cap nut. By fitting the protrusion into the formed small hole and fixing the protrusion and the cap nut by welding or the like, it is easy to position the nut and the threaded part when they are fixed, and the fixing work such as welding can be easily automated. Since the structure is simple and can be manufactured at low cost, and the surface of the welded part has a smooth curvature, uniform welding is possible and reliable welding can be performed. It has this excellent effect.
第１図は本考案の一実施例を示す端板部の側面
図、第２図ないし第５図は従来のバーナブルポイ
ズン棒集合体を示すもので、第２図は側面図、第
３図は平面図、第４図はバーナブルポイズン棒の
断面図、第５図はバーナブルポイズン棒の端板へ
の取付け状態を示す側面図である。
４……端板、２０……バーナブルポイズン棒、
２１……ねじ部、２２……袋ナツト、２３……突
起、２４……小孔、Ａ……バーナブルポイズン棒
集合体。
Fig. 1 is a side view of an end plate showing an embodiment of the present invention, Figs. 2 to 5 show a conventional burnable poison rod assembly, Fig. 2 is a side view, and Fig. 3 4 is a plan view, FIG. 4 is a sectional view of the burnable poison rod, and FIG. 5 is a side view showing how the burnable poison rod is attached to the end plate. 4... End plate, 20... Burnable poison rod,
21...screw part, 22...cap nut, 23...protrusion, 24...small hole, A...burnable poison rod assembly.
Claims (1)
ねじ部に袋ナツトを螺合して、上記端板に上記バ
ーナブルポイズン棒を取付けてなるバーナブルポ
イズン棒集合体であつて、上記ねじ部の先端の中
心部に突起を設け、かつ該ねじ部に螺合する上記
袋ナツトの中心部に、上記突起に嵌め合う小孔を
貫通して形成し、上記袋ナツトをねじ部に螺合し
て上記バーナブルポイズン棒を端板に取り付けた
状態において、上記突起と袋ナツトとを溶接して
なることを特徴とするバーナブルポイズン棒集合
体。 A burnable poison rod assembly is formed by attaching the burnable poison rod to the end plate by screwing a cap nut to the threaded portion at the upper end of the burnable poison rod passing through the end plate, A protrusion is provided at the center of the tip, and a small hole that fits into the protrusion is formed in the center of the cap nut to be screwed into the threaded portion, and the cap nut is screwed into the threaded portion. A burnable poison rod assembly, characterized in that the burnable poison rod is attached to an end plate, and the protrusion and the cap nut are welded together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985142198U JPH0514236Y2 (en) | 1985-09-18 | 1985-09-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985142198U JPH0514236Y2 (en) | 1985-09-18 | 1985-09-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6249792U JPS6249792U (en) | 1987-03-27 |
| JPH0514236Y2 true JPH0514236Y2 (en) | 1993-04-15 |
Family
ID=31050693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985142198U Expired - Lifetime JPH0514236Y2 (en) | 1985-09-18 | 1985-09-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0514236Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56111491A (en) * | 1980-02-09 | 1981-09-03 | Mitsubishi Atomic Power Ind | Reactor core insertion assembly |
-
1985
- 1985-09-18 JP JP1985142198U patent/JPH0514236Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56111491A (en) * | 1980-02-09 | 1981-09-03 | Mitsubishi Atomic Power Ind | Reactor core insertion assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6249792U (en) | 1987-03-27 |
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