JPH0513595B2 - - Google Patents
Info
- Publication number
- JPH0513595B2 JPH0513595B2 JP61205297A JP20529786A JPH0513595B2 JP H0513595 B2 JPH0513595 B2 JP H0513595B2 JP 61205297 A JP61205297 A JP 61205297A JP 20529786 A JP20529786 A JP 20529786A JP H0513595 B2 JPH0513595 B2 JP H0513595B2
- Authority
- JP
- Japan
- Prior art keywords
- hole
- cooling water
- end plug
- foreign matter
- fuel
- 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
- 239000000446 fuel Substances 0.000 claims description 23
- 238000005253 cladding Methods 0.000 claims description 13
- 239000008188 pellet Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 description 15
- 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
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 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
- Glass Compositions (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、原子炉燃料として使用される燃料棒
に関する。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to fuel rods used as nuclear reactor fuel.
「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。"Prior Art" FIG. 3 is a front view showing a general fuel assembly.
図中符号1および2は、上下に対向配置された
上部ノズルおよび下部ノズルであり、これら上部
ノズル1と下部ノズル2の間には、複数の制御棒
案内管3…が掛け渡されて固定されている。そし
て、これら制御棒案内管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、これら支
持格子4…の格子内に、多数の燃料棒5…が貫通
支持されている。これら燃料棒5は、被覆管の内
部に多数のペレツトが充填され、上端および下端
が端栓により封止されているものである。 Reference numerals 1 and 2 in the figure are an upper nozzle and a lower nozzle that are arranged vertically opposite each other, and a plurality of control rod guide tubes 3 are stretched and fixed between the upper nozzle 1 and the lower nozzle 2. ing. A plurality of support grids 4 are attached to the middle portions of these control rod guide tubes 3, and a large number of fuel rods 5 are supported through the support grids 4. These fuel rods 5 have a cladding tube filled with a large number of pellets, and the upper and lower ends thereof are sealed with end plugs.
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、上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
子炉の稼働時には、この炉心内部に下方から上方
へと勢いよく冷却水が循環されるようになつてお
り、この冷却水が、燃料集合体の下部ノズル2に
形成されているノズル孔を通つて、燃料棒5…の
間を通り抜け、上部ノズル1に形成されているノ
ズル孔から排出されるまでの間に、燃料棒5…に
より加熱されるようになつている。 A large number of such fuel assemblies are vertically charged into the core of a nuclear reactor vessel and supported by being sandwiched between an upper core plate and a lower core plate. When the reactor is operating, cooling water is vigorously circulated inside the reactor core from below to above, and this cooling water flows through the nozzle holes formed in the lower nozzle 2 of the fuel assembly. The fuel is heated by the fuel rods 5 while passing between the fuel rods 5 and being discharged from the nozzle holes formed in the upper nozzle 1.
「発明が解決しようとする問題点」
ところで、前記の燃料集合体においては、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、
被覆管の下端部を損傷させてしまう可能性が全く
ないとはいえないのである。"Problems to be Solved by the Invention" By the way, it has been pointed out that in the above fuel assembly, there is a risk that the lower end portions of the fuel rods 5 may be damaged. In other words, 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 hole of the lower nozzle 2 together with the cooling water, and the flow of the cooling water will be severely disturbed at the lower end of the fuel rod 5... collided with the cladding near the
There is a possibility that the lower end of the cladding tube may be damaged.
「発明の目的」
本発明は、上記事情に鑑みてなされたもので、
冷却水中に万が一異物が混入した場合でも、この
異物を捕捉し、被覆管の損傷を防ぐことができる
燃料棒を提供することを目的とする。"Object of the invention" The present invention was made in view of the above circumstances, and
An object of the present invention is to provide a fuel rod that can trap foreign matter and prevent damage to a cladding tube even if foreign matter should be mixed into cooling water.
「問題点を解決するための手段」
本発明の燃料棒は、下部端栓の下端面に異物ト
ラツプ用の穴を形成するとともに、この穴の内面
から端栓の外周面に至る連通路を形成したことを
特徴とする。"Means for Solving the Problems" The fuel rod of the present invention has a hole for trapping foreign matter formed in the lower end surface of the lower end plug, and a communication path from the inner surface of this hole to the outer peripheral surface of the end plug. It is characterized by what it did.
「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" Hereinafter, an example of the present invention will be described in detail using the drawings.
第1図は本発明の燃料棒の要部を示すものであ
り、図中符号10は被覆管、11は被覆管に充填
されたペレツト、12は被覆管の下端を封止する
下部端栓である。 FIG. 1 shows the main parts of the fuel rod of the present invention, in which reference numeral 10 is a cladding tube, 11 is a pellet filled in the cladding tube, and 12 is a lower end plug for sealing the lower end of the cladding tube. be.
この下部端栓12は、従来の下部端栓よりも軸
線方向に長いもので、この下端面には、異物トラ
ツプ用の穴13が形成されている。この穴13の
内径は、端線12の強度を許容以下に低下させな
い限りにおいて、できるだけ大きい方が望まし
い。また、この穴13の開口部14は、下方に向
けて広がるテーパ状とされ、穴13の実質的な開
口面積が大きくされている。 This lower end plug 12 is longer in the axial direction than the conventional lower end plug, and has a hole 13 for trapping foreign matter formed in its lower end surface. The inner diameter of this hole 13 is desirably as large as possible as long as the strength of the end wire 12 is not reduced below an allowable level. Further, the opening 14 of the hole 13 is tapered to widen downward, so that the substantial opening area of the hole 13 is increased.
前記穴13の行き止まり部15は、すり鉢状に
窄まつて形成されており、この行き止まり部15
の内面から斜め上方に向けて端栓12の外周面に
至る連通路16が計4つ形成されている。これら
連通路16の径は、冷却水内に混入しやすい異物
の大きさを考慮して決定されることが望ましい。 The dead end portion 15 of the hole 13 is narrowed into a mortar shape.
A total of four communicating passages 16 are formed extending diagonally upward from the inner surface of the end plug 12 to the outer circumferential surface of the end plug 12. It is desirable that the diameters of these communication passages 16 be determined in consideration of the size of foreign matter that is likely to get mixed into the cooling water.
このような構成からなる燃料棒によれば、原子
炉内に流れる冷却水に万が一異物が混入した場合
にも、この冷却水が穴13に入り、連通路16…
を通つて流れ出る際に、異物のみを穴13の中に
捕らえることができる。しかも、穴13の中に異
物が一旦入ると、冷却水の流れによりこの異物は
穴13の行き止まり部15に押し付けられ、冷却
水が流れている限りは端栓12内に保持されたま
まとなる。したがつて、この燃料棒によれば、異
物が被覆管10に衝突する可能性を著しく低減す
ることができ、被覆管10の破損等のトラブルを
未然に回避することが可能である。 According to the fuel rod having such a configuration, even if foreign matter were to get mixed into the cooling water flowing inside the reactor, this cooling water would enter the holes 13 and pass through the communication passages 16...
Only foreign objects can be trapped in the holes 13 as they flow through. Furthermore, once a foreign object enters the hole 13, the flow of cooling water forces the foreign object against the dead end portion 15 of the hole 13, and it remains retained within the end plug 12 as long as the cooling water continues to flow. . Therefore, according to this fuel rod, the possibility that foreign matter will collide with the cladding tube 10 can be significantly reduced, and troubles such as damage to the cladding tube 10 can be avoided.
なお、前記実施例では、連通路16が斜め上方
に向けて形成されていたが、これに限らず、第2
図のように行き止まり面20を水平に形成すると
ともに、連通路21…を水平方向に向けて形成し
てもよく、このようにした場合には前記実施例よ
りも穴22の容量を大きくすることができる。 In the above embodiment, the communication path 16 was formed diagonally upward, but the communication path 16 is not limited to this.
As shown in the figure, the dead-end surface 20 may be formed horizontally, and the communication passages 21 may be formed horizontally. In this case, the capacity of the hole 22 can be made larger than in the previous embodiment. I can do it.
また、連通路の断面形状は前記実施例のように
円形でなくてもよく、例えば、連通路の断面形状
を細長くした場合には、断面円形の場合に比べ小
さな異物も捕らえることができるようになる。さ
らにまた、穴の周壁に多数の連通孔(連通路)を
形成して端栓下部を多孔状とすることも可能であ
り、その場合には、穴を通過する冷却水の流量を
増すことができる。 Furthermore, the cross-sectional shape of the communication path does not have to be circular as in the above embodiment. For example, if the cross-sectional shape of the communication path is elongated, it will be possible to trap even small foreign objects compared to a case where the communication path has a circular cross-section. Become. Furthermore, it is also possible to form a large number of communication holes (communication paths) in the peripheral wall of the hole to make the lower part of the end plug porous, and in that case, the flow rate of cooling water passing through the hole can be increased. can.
「発明の効果」
本発明の燃料棒によれば、炉心内に流れる冷却
水に万が一異物が混入した場合にも、この冷却水
が下部端栓の穴に入り、連通路を通つて流れでる
際に、異物のみを穴の中に捕らえることができ
る。しかも、異物を一旦穴の中に捕らえると、冷
却水の流れにより、端栓内に異物を保持しつづけ
るので、異物が被覆管に衝突する可能性を低減す
ることができ、被覆管破損等のトラブルを未然に
防ぐことができる。"Effects of the Invention" According to the fuel rod of the present invention, even if foreign matter should enter the cooling water flowing into the core, the cooling water enters the hole in the lower end plug and flows out through the communication passage. In addition, only foreign objects can be trapped in the hole. Moreover, once the foreign object is caught in the hole, the flow of cooling water keeps the foreign object in the end plug, reducing the possibility of the foreign object colliding with the cladding tube, thereby reducing the possibility of damage to the cladding tube. You can prevent problems from occurring.
第1図は本発明の一実施例の燃料棒の要部を示
す縦断面図、第2図は本発明の他の実施例の燃料
棒の要部を示す縦断面図、第3図は一般的な燃料
集合体の正面図である。
10……被覆管、11……ペレツト、12……
下部端栓、13……異物トラツプ用の穴、15…
…行き止まり部、16……連通路、20……行き
止まり面、21……連通路、22……異物トラツ
プ用の穴。
FIG. 1 is a longitudinal sectional view showing the main parts of a fuel rod according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the main parts of a fuel rod according to another embodiment of the invention, and FIG. 3 is a general FIG. 2 is a front view of a typical fuel assembly. 10...cladding tube, 11...pellet, 12...
Lower end plug, 13... Hole for foreign body trap, 15...
...Dead end portion, 16...Communication path, 20...Dead end surface, 21...Communication path, 22...Foreign object trap hole.
Claims (1)
によつて塞いだ燃料棒において、 前記下部端栓の下端面に、異物トラツプ用の穴
を形成するとともに、この穴の内面から端栓の外
周面に至る連通路を形成したことを特徴とする燃
料棒。[Scope of Claims] 1. In a fuel rod in which the lower end of a cladding tube filled with pellets is closed by a lower end plug, a hole for trapping foreign matter is formed in the lower end surface of the lower end plug, and a hole for trapping foreign matter is formed in the lower end surface of the lower end plug, and A fuel rod characterized by forming a communication path from the inner surface to the outer peripheral surface of the end plug.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61205297A JPS6361183A (en) | 1986-09-01 | 1986-09-01 | Fuel rod |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61205297A JPS6361183A (en) | 1986-09-01 | 1986-09-01 | Fuel rod |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6361183A JPS6361183A (en) | 1988-03-17 |
JPH0513595B2 true JPH0513595B2 (en) | 1993-02-22 |
Family
ID=16504633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61205297A Granted JPS6361183A (en) | 1986-09-01 | 1986-09-01 | Fuel rod |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6361183A (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5483564A (en) * | 1993-04-12 | 1996-01-09 | General Electric Company | Lower tie plate strainers including double corrugated strainers for boiling water reactors |
US5390221A (en) * | 1993-08-23 | 1995-02-14 | General Electric Company | Debris filters with flow bypass for boiling water reactors |
US5390220A (en) * | 1993-11-29 | 1995-02-14 | General Electric Company | Lower tie plate strainers including helical spring strainers for boiling water reactors |
US5345483A (en) * | 1993-12-02 | 1994-09-06 | General Electric Company | Lower tie plate strainers having double plate with offset holes for boiling water reactors |
US5488634A (en) * | 1994-02-10 | 1996-01-30 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5473650A (en) * | 1994-04-15 | 1995-12-05 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5539793A (en) * | 1994-10-27 | 1996-07-23 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5519745A (en) * | 1994-11-03 | 1996-05-21 | General Electric Company | Lower tie plate debris catcher for a nuclear reactor |
US5528640A (en) * | 1994-11-07 | 1996-06-18 | General Electric Company | Low pressure double offset plate catcher for a nuclear reactor |
US5748694A (en) * | 1996-03-26 | 1998-05-05 | General Electric Company | Fuel bundle filter for a nuclear reactor fuel bundle assembly |
-
1986
- 1986-09-01 JP JP61205297A patent/JPS6361183A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6361183A (en) | 1988-03-17 |
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