JPS6375593A - Lower nozzle - Google Patents
Lower nozzleInfo
- Publication number
- JPS6375593A JPS6375593A JP61220678A JP22067886A JPS6375593A JP S6375593 A JPS6375593 A JP S6375593A JP 61220678 A JP61220678 A JP 61220678A JP 22067886 A JP22067886 A JP 22067886A JP S6375593 A JPS6375593 A JP S6375593A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- lower nozzle
- hole
- foreign matter
- screen
- 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.)
- Granted
Links
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 24
- 239000000498 cooling water Substances 0.000 description 12
- 238000005253 cladding Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 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
- Magnetic Heads (AREA)
- Fuel-Injection Apparatus (AREA)
- Percussion Or Vibration Massage (AREA)
- Monitoring And Testing Of Nuclear Reactors (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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
１産業上の利用分野」
本発明は、加圧水型軽水炉等の原子炉において使用され
る燃料集合体の下部ノズルに係わり、特に、冷却水中の
異物を除去することができる下部ノズルに関する。[Detailed Description of the Invention] 1. Field of Industrial Application The present invention relates to a lower nozzle of a fuel assembly used in a nuclear reactor such as a pressurized water type light water reactor, and in particular, it is capable of removing foreign matter in cooling water. Regarding the lower nozzle.
１−従来の技術」 第３図は、一般的な燃料集合体を示す正面図である。1-Conventional technology” FIG. 3 is a front view showing a general fuel assembly.
図中符号１および２は、」―下に対向配置された」一部
ノズルおよびト部ノズルであり、これら」二部ノズルｌ
と下部ノズル２の間には、複数の制御棒案内管３・・・
が掛は渡されて固定されている。そして、これら案内管
３・・の中途部には、複数の支持格子４・が取り付けら
れており、各支持格子４・・・の格子内に、ペレットが
封入された多数の燃料棒５ が貫通支持されている。Reference numerals 1 and 2 in the figure are a partial nozzle and a bottom nozzle arranged opposite each other, and these two-part nozzles are
A plurality of control rod guide tubes 3...
The fence has been passed and fixed. A plurality of support grids 4 are attached to the middle portions of these guide tubes 3, and a large number of fuel rods 5 filled with pellets penetrate through the lattice of each support grid 4. Supported.
このような燃料集合体は、原子炉容器の炉心に垂直状態
で多数装入され、」二部炉心板および下部炉心板の間に
はさまれて支持される。そして、原子炉の稼動時には、
下方から」二部へ向けて炉心内部に勢いよく冷却水が循
環されるようになっていて、この冷却水が、下部ノズル
２に形成されたノズル孔（図示せず）を通り、燃料棒５
・・・の間を通り抜け、」二部ノズル１に形成されてい
るノズル孔（図示せず）から排出されるまでの間に、加
熱されるようになっている。A large number of such fuel assemblies are vertically charged into the core of a nuclear reactor vessel, and are supported by being sandwiched between a two-part core plate and a lower core plate. And when the reactor is in operation,
Cooling water is vigorously circulated inside the core from the bottom toward the second part, and this cooling water passes through nozzle holes (not shown) formed in the lower nozzle 2, and flows through the fuel rods 5.
. . and is heated until it is discharged from a nozzle hole (not shown) formed in the two-part nozzle 1.
ところで、このような燃料集合体においては、従来より
燃料棒５・・の下端部が損傷するおそれがあることが指
摘されている。すなわち、なんらかの原因で冷却水中に
ゴミ、金属屑等の異物が混入すると、これら異物が冷却
水とともに下部ノズル２のノズル孔を通過し、冷却水の
流れが激しく乱れている燃料棒５・・・の下端部近傍に
おいて被覆管に衝突して、被覆管の下端部を傷つ（Ｊろ
可能性が全くないとはいえないのである。By the way, in such a fuel assembly, it has been pointed out that there is a risk of damage to the lower end portions of the fuel rods 5. That is, if foreign matter such as dust or metal chips gets mixed into the cooling water for some reason, these foreign matter will pass through the nozzle holes of the lower nozzle 2 together with the cooling water, and the flow of the cooling water will be severely disturbed in the fuel rods 5... It cannot be said that there is a possibility that it will collide with the cladding tube near the lower end and damage the lower end of the cladding tube.
そこで、本出願人等は、特願昭５９−１７９１４号にお
いて、このような被覆管損傷を防ぐことのできる燃料集
合体を提案した。Therefore, in Japanese Patent Application No. 59-17914, the present applicant proposed a fuel assembly that can prevent such damage to the cladding tube.
第４図は、その燃料集合体の要部を示す正面図である。FIG. 4 is a front view showing the main parts of the fuel assembly.
この燃料集合体は、燃料棒５・・と、ノズル孔２Ａを有
する下部ノズル２との間に、冷却水中の異物を捕捉する
ためのスクリーン１０を水平に配設したことを特徴とし
ている。This fuel assembly is characterized in that a screen 10 for trapping foreign matter in the cooling water is horizontally disposed between the fuel rods 5 and the lower nozzle 2 having the nozzle holes 2A.
このスクリーン１０は、ステンレス製の金網であって、
第５図に示すように下部ノズル２の上面と略同形状をな
すとともに、制御棒案内管３ および計装管６を挿入固
定するための孔ＩＩ が形成されている。そして、この
スクリーンＩＯは、前記孔１１・・・内に案内管３ ・
および計装管６が挿通された後、案内管３・・・に対し
溶接固定されている。This screen 10 is a stainless steel wire mesh,
As shown in FIG. 5, a hole II is formed which has approximately the same shape as the upper surface of the lower nozzle 2, and into which the control rod guide tube 3 and the instrumentation tube 6 are inserted and fixed. This screen IO has a guide tube 3 in the hole 11.
After the instrumentation tube 6 is inserted, it is welded and fixed to the guide tube 3.
［−発明が解決（７ようとずろ問題点」ところで、この
ような燃料集合体にあっては、スクリーン１０を装着す
るに際し、■スクリーン１０の孔１１・・に制御棒案内
管３・・・および計装管６を挿通する、■スクリーン１
０を下部ノズル２の１−面と平行に位置決めする、■ス
クリーンＩＯの孔１１ ・の周縁と案内管３・ どを溶
接してスクリーン１０を固定する、とい〕た一連の作業
が必要で、取り付Ｃすに手ＩＨｆがかかるという欠点が
あっノこ。[-Solved by the invention (7. Problems to be solved)] By the way, in such a fuel assembly, when installing the screen 10, ■ the control rod guide tube 3... is inserted into the hole 11... of the screen 10. ■Screen 1 through which the instrumentation tube 6 is inserted
A series of operations are required, such as positioning the screen 10 parallel to the 1-plane of the lower nozzle 2, and fixing the screen 10 by welding the periphery of the hole 11 of the screen IO and the guide tube 3. The drawback is that it requires hand IHF to install.
また、この燃料集合体では、原子炉稼動時にスクリーン
１０に対し大きな流水圧がかかろうえ、スクリーン１０
を案内管３・・・に対して溶接固定しているだ（Ｊなの
で、取付強度の点で信頼性が十分であるとは言い難かっ
た。In addition, in this fuel assembly, large water pressure is applied to the screen 10 during reactor operation, and the screen 10
is fixed by welding to the guide tube 3 (J), so it was difficult to say that the reliability was sufficient in terms of mounting strength.
［発明の目的 ］
本発明は、１ｉｉｊ記事情に鑑みてなされたもので、冷
却水中の異物を捕捉して被覆管損傷を防ぐことができ、
しかもスクリーンを取り（＝１ける従来の方−３＝
法に比べて燃料集合体の組み立てが容易で、異物捕捉部
の強度が高い下部ノズルを提供子ることを目的とする。[Object of the Invention] The present invention has been made in view of the above circumstances, and is capable of trapping foreign objects in cooling water to prevent damage to cladding pipes.
In addition, the objective is to provide a lower nozzle in which the fuel assembly is easier to assemble compared to the conventional method in which the screen is removed (=1 minus 3) and the foreign matter trapping portion is strong.
「問題点を解決するための手段−１
本発明の下部ノズルは、ノズル孔の」二線部に異物捕捉
部を一体形成したことを特徴とオろ。``Means for Solving the Problems-1'' The lower nozzle of the present invention is characterized in that a foreign matter trapping portion is integrally formed in the two-line portion of the nozzle hole.
「実施例」 以下、本発明の実施例を図面を用いて詳細に説明する。"Example" Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は一実施例の下部ノズル２０の一部を示す平面図
であり、２０Δ、２０＋３はそれぞれノズル孔、２１は
制御棒案内管（図示せず）を貫通固定するための案内管
固定孔である。ノズル孔２０Ｂは、案内管固定孔２１の
近傍に位置するもので、その位置的な制約により他のノ
ズル孔２ＯＡに比べて若干小径とされている。FIG. 1 is a plan view showing a part of the lower nozzle 20 of one embodiment, where 20Δ and 20+3 are nozzle holes, and 21 is a guide tube fixing hole for penetrating and fixing a control rod guide tube (not shown). It is. The nozzle hole 20B is located near the guide tube fixing hole 21, and has a slightly smaller diameter than the other nozzle holes 2OA due to its positional restrictions.
前記ノズル孔２０Ａの１一端開口部には、この開口部を
塞ぐように十文字状の格子（異物捕捉部）２２Ａが−・
体形成されており、ノズル孔２ＯＡの直径は、格子２２
Ａにより開口面積が狭まる分、予＝４−
め通常の下部ノズルのノズル孔よりも大きくされている
。At one end opening of the nozzle hole 20A, a cross-shaped lattice (foreign object trapping part) 22A is provided so as to close this opening.
The diameter of the nozzle hole 2OA is the same as the grid 22.
Since the opening area is narrowed due to A, the nozzle hole is preliminarily made larger than the nozzle hole of a normal lower nozzle.
同様に、ノズル孔２０Ｂにも、その」一端開口部に直線
状の格子２２Ｂが一体形成されており、ノズル孔２０Ｂ
の直径は、格子２２Ｂにより開口面積が狭まる分、予め
従来の下部ノズルよりも大きくされている。Similarly, a linear lattice 22B is integrally formed at one end opening of the nozzle hole 20B.
The diameter of the lower nozzle is made larger in advance than that of the conventional lower nozzle because the opening area is narrowed by the grid 22B.
このような下部ノズル２０によれば、原子炉内に流れる
冷却水に万が一異物か混入した場合にも、この冷却水が
下部ノズル２０のノズル孔２０Ａ。According to such a lower nozzle 20, even if foreign matter should be mixed into the cooling water flowing inside the reactor, this cooling water will flow through the nozzle hole 20A of the lower nozzle 20.
２０Ｂを通過する際に、異物のみを格子２２Ａ、２２Ｂ
により捕らえることができる。しかも、ノズル孔２ＯＡ
、２０Ｂ内に異物が一旦捕捉されると、この異物は、冷
却水の流れにより格子２２Ａ、２２Ｂｉこ押しく＝Ｊけ
られ、冷却水が流れている限りノズル孔２ＯＡ、２０Ｂ
から脱落することがない。When passing through 20B, only the foreign matter is removed through the grids 22A and 22B.
It can be captured by Moreover, the nozzle hole 2OA
, 20B, the foreign matter is pushed through the grids 22A, 22Bi by the flow of cooling water, and as long as the cooling water is flowing, the foreign matter is trapped in the nozzle holes 2OA, 20B.
It will not fall off.
したがって、この下部ノズル２０によれば、異物が燃料
棒５・に衝突する可能性を著しく低減することができ、
被覆管の破損等のトラブルを未然に回避オろことが可能
である。Therefore, this lower nozzle 20 can significantly reduce the possibility that foreign objects will collide with the fuel rods 5.
It is possible to avoid problems such as damage to the cladding tube.
また、このト部、ノズル２０にあ−・ては、下部ノズル
２０と一体に格子２２Δ、２２Ｂを形成しており、燃料
集合体を組み立てるに際して、一般の下部ノズルと同様
に案内管への取り（４１：］を行なうこ七ができるので
、燃料棒と上部ノズルの間にスクリーンを配設する従来
の方法に比へて、燃オー１集合体の組み５’ｆ、てに要
する手間を著しく軽減オろことができる。In addition, this top part and nozzle 20 form gratings 22Δ and 22B integrally with the lower nozzle 20, and when assembling a fuel assembly, they can be attached to the guide pipe in the same way as a general lower nozzle. (41:), compared to the conventional method of arranging a screen between the fuel rods and the upper nozzle, the effort required for assembling the fuel assembly 5'f is significantly reduced. It can be reduced.
また、下部ノズル２０と格子２２Ａ、２２Ｔ３どを一体
形成しているので、格子２２Δ、２２Ｂの強度が高い。Furthermore, since the lower nozzle 20 and the gratings 22A, 22T3, etc. are integrally formed, the strength of the gratings 22Δ, 22B is high.
しかも個々の格子２２ Ａ 、 ２２ Ｆ（にががる流
水圧は小さいので、スクリーンを段目る従来の方法に比
べて信頼性を格段に高めろこ稈が可能である。Moreover, since the water pressure flowing through the individual grids 22A, 22F is small, it is possible to construct a culm with much higher reliability than the conventional method of using screens in stages.
なお、前記実施例では、ノズル孔２ＯＡに４・文字状の
格子２２Ａ１ノズル孔２０ Ｂに直線状の格子２２Ｂを
形成していたが、本発明はこれらの形状に限られること
はなく、例えば、各ノズル孔２０Δ、２０Ｂに平行な２
本の格子あるいは［＊−１状の格子を形成してもよい。In the above embodiment, the nozzle hole 2OA is formed with a 4-letter-shaped lattice 22A, and the nozzle hole 20B is formed with a linear lattice 22B, but the present invention is not limited to these shapes, and for example, 2 parallel to each nozzle hole 20Δ, 20B
A book lattice or a [*-1-shaped lattice] may be formed.
さらに、下部ノズル２０の下面側から行き止まり穴を形
成したのち、１１而側から複数の小径の穴を形成し、こ
れらを連通させて異物捕ＩＦ部を構成１．でもよく、そ
の場合に（」異物捕捉部の加Ｔが容易となる利点がある
。Furthermore, after forming a dead end hole from the lower surface side of the lower nozzle 20, a plurality of small diameter holes are formed from the 11 side, and these are communicated to form a foreign matter trapping IF section.1. In that case, there is an advantage that the foreign matter trapping part can be easily added.
「発明の効果−１
本発明のド部ノズルは、ノズル孔の上部に異物捕捉部を
一体形成１．たちのなので、燃料集合体を組み立てるに
際し、通常の下部ノズルと同様に取りイχｉ＋Ｊろこと
かでき、燃料棒と下部ノズルの間にスクリーンを配設す
る従来の方法に比べて、燃料集合体の絹み立てに要する
手間を低減することが可能である。また、下部ノズルと
一体に異物捕捉部を形成しているので、異物捕捉部の強
度が高く、信頼性が高い。"Effects of the Invention - 1 The lower part nozzle of the present invention has a foreign matter trapping part integrally formed at the upper part of the nozzle hole, so when assembling a fuel assembly, it can be removed in the same way as a normal lower nozzle. Compared to the conventional method of installing a screen between the fuel rods and the lower nozzle, it is possible to reduce the labor required for refining the fuel assembly.In addition, the lower nozzle and the Since a trapping portion is formed, the foreign matter trapping portion has high strength and reliability.
第１図は本発明の一実施例の下部ノズルの要部を示す平
面図、第２図は第１図の１１−■線視断面図である。
また、第３図は一般的な燃料集合体の正面図、第４図は
本出願人が先に出願した燃料集合体の要７一
部の正面図、第５図は同要部の平面図である。
２０・・・下部ノズル、
２ＯＡ、２０Ｂ・・・ノズル孔、
２１ 案内管固定孔、
２２Ａ、２２Ｂ・・格子（異物捕捉部）。FIG. 1 is a plan view showing essential parts of a lower nozzle according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line 11--■ in FIG. 1. In addition, Fig. 3 is a front view of a general fuel assembly, Fig. 4 is a front view of a part of the main part of the fuel assembly previously applied by the present applicant, and Fig. 5 is a plan view of the main part. It is. 20... Lower nozzle, 2OA, 20B... Nozzle hole, 21 Guide tube fixing hole, 22A, 22B... Grid (foreign matter trapping part).
Claims (1)
いて、 前記ノズル孔の上部に、異物捕捉部を一体形成したこと
を特徴とする下部ノズル。[Scope of Claim] A lower nozzle having a large number of nozzle holes penetrating vertically, characterized in that a foreign matter trapping part is integrally formed in the upper part of the nozzle hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61220678A JPS6375593A (en) | 1986-09-18 | 1986-09-18 | Lower nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61220678A JPS6375593A (en) | 1986-09-18 | 1986-09-18 | Lower nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6375593A true JPS6375593A (en) | 1988-04-05 |
| JPH0513596B2 JPH0513596B2 (en) | 1993-02-22 |
Family
ID=16754748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61220678A Granted JPS6375593A (en) | 1986-09-18 | 1986-09-18 | Lower nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6375593A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63156099U (en) * | 1987-03-31 | 1988-10-13 | ||
| JPS63285490A (en) * | 1987-05-05 | 1988-11-22 | ウエスチングハウス・エレクトリック・コーポレーション | Fragment filter lower nozzle in fuel aggregate |
| JPH03242599A (en) * | 1989-10-13 | 1991-10-29 | B & W Fuel Co | Nuclear-fuel aggregate foreign-matter filter |
| WO2015037484A1 (en) * | 2013-09-13 | 2015-03-19 | 三菱原子燃料株式会社 | Fuel assembly |
-
1986
- 1986-09-18 JP JP61220678A patent/JPS6375593A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63156099U (en) * | 1987-03-31 | 1988-10-13 | ||
| JPS63285490A (en) * | 1987-05-05 | 1988-11-22 | ウエスチングハウス・エレクトリック・コーポレーション | Fragment filter lower nozzle in fuel aggregate |
| JPH03242599A (en) * | 1989-10-13 | 1991-10-29 | B & W Fuel Co | Nuclear-fuel aggregate foreign-matter filter |
| WO2015037484A1 (en) * | 2013-09-13 | 2015-03-19 | 三菱原子燃料株式会社 | Fuel assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0513596B2 (en) | 1993-02-22 |
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