JPH0623997Y2 - Control rod - Google Patents
Control rodInfo
- Publication number
- JPH0623997Y2 JPH0623997Y2 JP1988030507U JP3050788U JPH0623997Y2 JP H0623997 Y2 JPH0623997 Y2 JP H0623997Y2 JP 1988030507 U JP1988030507 U JP 1988030507U JP 3050788 U JP3050788 U JP 3050788U JP H0623997 Y2 JPH0623997 Y2 JP H0623997Y2
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- neutron absorber
- outer tube
- end side
- outer peripheral
- 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
- 239000006096 absorbing agent Substances 0.000 claims description 40
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000007689 inspection Methods 0.000 description 12
- 230000001678 irradiating effect Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect 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
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【考案の詳細な説明】 「産業上の利用分野」 この考案は、原子炉出力の変化に伴う反応度変化を制御
する制御棒に関する。[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a control rod for controlling a change in reactivity associated with a change in reactor output.
「従来の技術」 原子炉に装荷される燃料集合体には燃料棒の他に、原子
炉出力の変化に伴う反応度変化を制御したり、あるいは
過剰な反応度を抑制するための制御棒がスパイダと呼ば
れる支持体に複数本支持されて燃料棒の間に装備されて
いる。"Prior Art" In addition to fuel rods, the fuel assemblies loaded in the reactor are equipped with control rods for controlling reactivity changes associated with changes in reactor power or for suppressing excessive reactivity. A plurality of supports, called spiders, are supported between the fuel rods.
上記制御棒は例えば、第４図に示すように、外管１の内
部に外径の異なる２種類の中性子吸収体２，３が挿入さ
れたものであり、外管２の上下端部はそれぞれ上部端栓
４および下部端栓５により閉塞されている。The control rod is, for example, as shown in FIG. 4, in which two types of neutron absorbers 2 and 3 having different outer diameters are inserted inside the outer tube 1, and the upper and lower ends of the outer tube 2 are respectively It is closed by an upper end plug 4 and a lower end plug 5.
また、上記制御棒は燃料集合体に上方から挿入されるの
で、特に、その下端部が高温となりまた中性子を多く吸
収して膨張する。したがって、上記外管１の下端側に位
置する中性子吸収体３は膨張代を見込んでその外径を中
性子吸収体２より小径としたものであり、中性子吸収体
２より若干小径（0.1mm程度）の第一小径部６と、この
第一小径部より若干小径（0.1mm程度）の第二小径部７
とから構成されている。この第二小径部７の外周面には
直径方向に貫通する貫通孔８が形成されている。Further, since the control rod is inserted into the fuel assembly from above, the lower end of the control rod in particular becomes hot and absorbs a large amount of neutrons to expand. Therefore, the neutron absorber 3 located on the lower end side of the outer tube 1 has an outer diameter smaller than that of the neutron absorber 2 in consideration of the expansion margin, and is slightly smaller than the neutron absorber 2 (about 0.1 mm). First small diameter portion 6 and second small diameter portion 7 slightly smaller than this first small diameter portion (about 0.1 mm).
It consists of and. A through hole 8 penetrating in the diametrical direction is formed on the outer peripheral surface of the second small diameter portion 7.
そして、上記構成の制御棒においては、中性子吸収体３
が外管１の下端部に挿入されているかどうかを、上記貫
通孔８にＸ線を照射するＸ線透過試験により貫通孔８の
有無を確認することにより検査していた。And in the control rod of the said structure, the neutron absorber 3
It was inspected by checking the presence or absence of the through hole 8 by an X-ray transmission test in which the through hole 8 is irradiated with X-rays.
「考案が解決しようとする課題」 ところが、上記の制御棒にあっては、外管１の外側から
では、貫通孔８の方向性を確認することができないの
で、Ｘ線を照射して検査をする際に、制御棒を回転させ
なければならず、このため、検査に時間がかかり、非常
に検査効率が悪いという問題点があった。"Problems to be solved by the invention" However, in the above control rod, since it is not possible to confirm the directionality of the through hole 8 from the outside of the outer tube 1, the inspection is performed by irradiating X-rays. In doing so, the control rod had to be rotated, and therefore, there was a problem that the inspection took time and the inspection efficiency was very poor.
「考案の目的」 この考案は、上記事情に鑑みてなされたものであり、検
査効率を向上させることができる制御棒を提供すること
を目的としている。"Purpose of Invention" The present invention has been made in view of the above circumstances, and an object thereof is to provide a control rod capable of improving inspection efficiency.
「課題を解決するための手段」 この考案の制御棒は、外管の下端側に位置すべき中性子
吸収体の外周部に周方向に沿う切欠部を形成したもので
あり、この切欠部を形成する位置として、上記中性子吸
収体の外周面と下端面との稜線部、または上記中性子吸
収体の軸線方向中途部の外周面に形成した。"Means for Solving the Problem" The control rod of the present invention is one in which a notch along the circumferential direction is formed in the outer peripheral part of the neutron absorber to be located at the lower end side of the outer tube, and the notch is formed. As the position to be formed, it was formed on the ridge portion between the outer peripheral surface and the lower end surface of the neutron absorber, or on the outer peripheral surface of the neutron absorber at a midway portion in the axial direction.
また、外管の下端側に位置すべき中性子吸収体の下端面
に凹部を形成すると共に、下部端栓の端面に上記凹部に
係合する凸部を形成したものである。Further, the neutron absorber to be located on the lower end side of the outer tube is formed with a recess on the lower end surface, and the end surface of the lower end plug is formed with a projection engaging with the recess.
「作用」 この考案の制御棒にあっては、外管の下端側に位置すべ
き中性子吸収体の外周部に周方向に沿う切欠部を形成し
たので、従来の制御棒のように、貫通孔の方向性により
外管を回転させることなく、切欠部にＸ線を周方向のど
の位置に照射しても、切欠部の有無を確認することがで
きる。[Operation] In the control rod of the present invention, since the notch along the circumferential direction is formed on the outer peripheral portion of the neutron absorber which should be located at the lower end side of the outer tube, the through hole is formed like the conventional control rod. It is possible to confirm the presence or absence of the cutout portion by irradiating the cutout portion with X-rays at any position in the circumferential direction without rotating the outer tube due to the directionality of.
また、外管の下端側に位置すべき中性子吸収体の下端面
に凹部を形成すると共に、下部端栓の端面に上記凹部に
係合する凸部を形成したので、外管の下端部に、ここに
位置すべきでない中性子吸収体が間違えて挿入された場
合、この中性子吸収体の下端面と下部端栓の端面との間
に周方向に沿ってギャップが生じ、一方外管の下端部
に、ここに位置すべき中性子吸収体が挿入された場合、
上記凹部に凸部が係合して上記ギャップが生じない。し
たがって、従来の制御棒のように、貫通孔の方向性によ
り外管を回転させることなく、この部分にＸ線を照射す
ることによりこのギャップの有無を確認できる。Further, with forming a recess in the lower end surface of the neutron absorber to be located on the lower end side of the outer tube, since the convex portion that engages with the recess is formed on the end surface of the lower end plug, the lower end portion of the outer tube, If a neutron absorber that should not be located here is inserted by mistake, a gap is created along the circumferential direction between the lower end face of this neutron absorber and the end face of the lower end plug, while at the lower end of the outer tube. , If a neutron absorber should be placed here,
The convex portion engages with the concave portion and the gap does not occur. Therefore, the presence or absence of this gap can be confirmed by irradiating this portion with X-rays without rotating the outer tube due to the directionality of the through hole as in the conventional control rod.
「実施例」 以下、この考案の実施例を第１図ないし第３図面を参照
して説明する。[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
第１図は制御棒の下端部の断面図であり、この図に示す
中性子吸収体３の第二小径部７の外周面７ａと下端面７
ｂとの稜線部には、面取部（切欠部）１０が周方向に沿
って形成されている。FIG. 1 is a cross-sectional view of the lower end portion of the control rod, and the outer peripheral surface 7a and the lower end surface 7 of the second small diameter portion 7 of the neutron absorber 3 shown in this drawing.
A chamfered portion (notch portion) 10 is formed along the circumferential direction at the ridge line with b.
そしてこのような制御棒では、この面取部１０にＸ線を
照射して面取部１０の有無を確認することにより中性子
吸収体３が外管１の下端部に挿入されているかどうかを
確認するようになっているが、この面取部１０が中性子
吸収体３の周方向に沿って形成されているので、従来の
制御棒における貫通孔８のようにその方向性により外管
１を回転させる必要性がなく、よって検査時間を短縮し
て、検査効率を向上させることができる。Then, in such a control rod, it is confirmed whether or not the neutron absorber 3 is inserted in the lower end portion of the outer tube 1 by irradiating the chamfered portion 10 with X-rays and confirming the presence or absence of the chamfered portion 10. However, since the chamfered portion 10 is formed along the circumferential direction of the neutron absorber 3, the outer tube 1 is rotated by its directionality like the through hole 8 in the conventional control rod. Therefore, the inspection time can be shortened and the inspection efficiency can be improved.
第２図に示す制御棒は中性子吸収体３の第二小径部７の
軸線方向中央部の外周面に切欠部１１が周方向に沿って
形成されたものである。The control rod shown in FIG. 2 has a notch 11 formed along the circumferential direction on the outer peripheral surface of the second small diameter portion 7 of the neutron absorber 3 at the central portion in the axial direction.
そして、この制御棒においても、切欠部１１が中性子吸
収体３の周方向に沿って形成されているので、第１図に
示す制御棒と同様の効果が得られる。Also in this control rod, since the notch 11 is formed along the circumferential direction of the neutron absorber 3, the same effect as the control rod shown in FIG. 1 can be obtained.
第３図に示す制御棒は、中性子吸収体３の第二小径部７
の下端面７ｂに凹部１２を形成すると共に、上記下部端
栓５の端面５ａに凹部１２に係合する凸部１３を形成し
たものである。The control rod shown in FIG. 3 is the second small diameter portion 7 of the neutron absorber 3.
The lower end surface 7b of the lower end plug 5 is formed with a recess 12, and the end surface 5a of the lower end plug 5 is formed with a projection 13 that engages with the recess 12.
そして、このような制御棒では、外管１の下端部に間違
えて中性子吸収体２が挿入された場合、この中性子吸収
体２の下端面と下部端栓５の端面５ａとの間にギャップ
が生じるので、この部分にＸ線を照射することによりこ
のギャップを確認でき、よって外管１の下端部に中性子
吸収体３が挿入されていないことが確認できる。In such a control rod, when the neutron absorber 2 is mistakenly inserted into the lower end portion of the outer tube 1, a gap is formed between the lower end surface of the neutron absorber 2 and the end surface 5a of the lower end plug 5. Since this occurs, it is possible to confirm this gap by irradiating this portion with X-rays, and thus it is possible to confirm that the neutron absorber 3 is not inserted in the lower end portion of the outer tube 1.
一方、外管１の下端部に中性子吸収体３が挿入されてい
ると、上記凹部１２に凸部１３が係合するので、上記ギ
ャップが生じることがない。よってこの部分にＸ線照射
することによりギャップが無いことが判り、外管１の下
端部に中性子吸収体３が挿入されていることが確認でき
る。On the other hand, when the neutron absorber 3 is inserted into the lower end portion of the outer tube 1, the convex portion 13 engages with the concave portion 12, so that the gap does not occur. Therefore, it is found that there is no gap by irradiating this portion with X-rays, and it can be confirmed that the neutron absorber 3 is inserted in the lower end portion of the outer tube 1.
しかも上記ギャップは中性子吸収体２の周方向に沿って
生じるので、従来の制御棒における貫通孔８のようにそ
の方向性により外管１を回転させる必要性がなく、よっ
て検査時間を短縮して、検査効率を向上させることがで
きる。Moreover, since the gap is generated along the circumferential direction of the neutron absorber 2, it is not necessary to rotate the outer tube 1 due to its directionality unlike the through hole 8 in the conventional control rod, thus shortening the inspection time. The inspection efficiency can be improved.
「考案の効果」 以上説明したように、この考案の制御棒によれば、外管
の下端側に位置すべき中性子吸収体の外周部に周方向に
沿う切欠部を形成したので、この部分にＸ線を周方向の
どの位置に照射しても、切欠部の有無を確認することが
でき、従来の制御棒のように、貫通孔の方向性により外
管を回転させる必要性がなく、よって検査時間を短縮し
て、検査効率を向上させることができる。[Advantage of device] As described above, according to the control rod of the device, since the notch along the circumferential direction is formed in the outer peripheral part of the neutron absorber which should be located at the lower end side of the outer tube, It is possible to confirm the presence or absence of the notch regardless of the position of the X-ray irradiated in the circumferential direction, and there is no need to rotate the outer tube due to the directionality of the through hole unlike the conventional control rod. The inspection time can be shortened and the inspection efficiency can be improved.
また、外管の下端側に位置すべき中性子吸収体の下端面
に凹部を形成すると共に、下部端栓の端面に上記凹部に
係合する凸部を形成したので、外管の下端部に、ここに
位置すべきでない中性子吸収体が間違えて挿入された場
合、この中性子吸収体の下端面と下部端栓の端面との間
にギャップが生じ、一方外管の下端部に、ここに位置す
べき中性子吸収体が挿入された場合、上記凹部に凸部が
係合して上記ギャップが生じない。したがって、この部
分にＸ線を照射することによりこのギャップの有無を確
認できるので、外管の下端部にここに位置すべき中性子
吸収体が挿入されてるかどうかを確認することができ、
しかも上記ギャップは中性子吸収体の周方向に沿って生
じるので、従来の制御棒のように、貫通孔の方向性によ
り外管を回転させる必要性がなく、よって検査時間を短
縮して、検査効率を向上させることができる。Further, with forming a recess in the lower end surface of the neutron absorber to be located on the lower end side of the outer tube, since the convex portion that engages with the recess is formed on the end surface of the lower end plug, the lower end portion of the outer tube, If a neutron absorber that should not be located here is inserted by mistake, a gap occurs between the lower end face of this neutron absorber and the end face of the lower end plug, while at the lower end of the outer tube, it is located here. When the power neutron absorber is inserted, the convex portion engages with the concave portion and the gap does not occur. Therefore, since it is possible to confirm the presence or absence of this gap by irradiating this portion with X-rays, it is possible to confirm whether or not the neutron absorber to be located here is inserted in the lower end portion of the outer tube,
Moreover, since the gap is generated along the circumferential direction of the neutron absorber, it is not necessary to rotate the outer tube due to the directionality of the through-hole unlike the conventional control rod, thus shortening the inspection time and improving the inspection efficiency. Can be improved.
第１図および第３図はそれぞれこの考案の制御棒の下端
部を示す断面図、第４図は従来の制御棒の断面図であ
る。 １……外管、３……中性子吸収体、 １０……面取部（切欠部）、１１……切欠部、 １２……凹部、１３……凸部。1 and 3 are sectional views showing the lower end portion of the control rod of the present invention, and FIG. 4 is a sectional view of a conventional control rod. 1 ... Outer tube, 3 ... Neutron absorber, 10 ... Chamfered part (notched part), 11 ... Notched part, 12 ... Recessed part, 13 ... Convex part.
───────────────────────────────────────────────────── フロントページの続き (72)考案者 舛井 寿 茨城県那珂郡東海村大字舟石川622番地１ 三菱原子燃料株式会社東海製作所内 (72)考案者 宮田 瑞穂 茨城県那珂郡東海村大字舟石川622番地１ 三菱原子燃料株式会社東海製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator, Hisashi Masui, 622, Funaishikawa, Tokai-mura, Naka-gun, Ibaraki Prefecture 1 Mitsubishi Nuclear Fuel Co., Ltd. Tokai Works (72) Mizuho Miyata, Ishikawa, Tokai-mura, Naka-gun, Ibaraki Prefecture Address 622 1 Inside Tokai Works, Mitsubishi Nuclear Fuel Co., Ltd.
Claims (4)
管の内部に中性子吸収体が挿入された制御棒において、
上記外管の下端側に位置すべき上記中性子吸収体の外周
部に周方向に沿う切欠部を形成したことを特徴とする制
御棒。1. A control rod in which a neutron absorber is inserted inside an outer tube whose lower end opening is closed by a lower end plug,
A control rod characterized in that a cutout portion is formed along the circumferential direction on the outer peripheral portion of the neutron absorber to be located on the lower end side of the outer pipe.
き上記中性子吸収体の外周面と下端面との稜線部に形成
されていること特徴とする特許請求の範囲第１項に記載
の制御棒。2. The cutout portion is formed at a ridgeline portion between the outer peripheral surface and the lower end surface of the neutron absorber which should be located at the lower end side of the outer tube. The control rod shown.
き上記中性子吸収体の軸線方向中途部の外周面に形成さ
れていることを特徴とする特許請求の範囲第１項に記載
の制御棒。3. The method according to claim 1, wherein the cutout portion is formed on the outer peripheral surface of the neutron absorber which should be located at the lower end side of the outer tube in the axially intermediate portion. Control rod.
管の内部に中性子吸収体が挿入された制御棒において、
上記外管の下端側に位置すべき上記中性子吸収体の下端
面に凹部を形成すると共に、上記下部端栓の端面に上記
凹部に係合する凸部を形成したことを特徴とする制御
棒。4. A control rod having a neutron absorber inserted inside an outer tube whose lower end opening is closed by a lower end plug,
A control rod characterized in that a recess is formed on the lower end surface of the neutron absorber to be located on the lower end side of the outer tube, and a convex portion that engages with the recess is formed on the end surface of the lower end plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988030507U JPH0623997Y2 (en) | 1988-03-08 | 1988-03-08 | Control rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988030507U JPH0623997Y2 (en) | 1988-03-08 | 1988-03-08 | Control rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01134298U JPH01134298U (en) | 1989-09-13 |
| JPH0623997Y2 true JPH0623997Y2 (en) | 1994-06-22 |
Family
ID=31255631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988030507U Expired - Lifetime JPH0623997Y2 (en) | 1988-03-08 | 1988-03-08 | Control rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623997Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE514802C2 (en) * | 1998-07-02 | 2001-04-23 | Westinghouse Atom Ab | Absorbator body and control rod |
| DE102005037966A1 (en) * | 2005-07-29 | 2007-02-01 | Areva Np Gmbh | Control rod for pressurized water nuclear reactor has absorber rod in cover tube that has recesses in its lower section as round or linear grooves |
-
1988
- 1988-03-08 JP JP1988030507U patent/JPH0623997Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01134298U (en) | 1989-09-13 |
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