JPS6025489A - Fuel body - Google Patents
Fuel bodyInfo
- Publication number
- JPS6025489A JPS6025489A JP58132710A JP13271083A JPS6025489A JP S6025489 A JPS6025489 A JP S6025489A JP 58132710 A JP58132710 A JP 58132710A JP 13271083 A JP13271083 A JP 13271083A JP S6025489 A JPS6025489 A JP S6025489A
- Authority
- JP
- Japan
- Prior art keywords
- stress
- spring
- end plug
- fuel
- generated
- 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
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
- Fuel-Injection Apparatus (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】
〔発明の利用分野〕
本発明は、核反応炉に使用される燃料要素に取イ1けら
れる上部端栓に係わる。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an upper end plug for a fuel element used in a nuclear reactor.
燃料の高燃焼度利用は、原子炉の高効率利用の上で必須
であり、それに対処できる燃料体の開発が進められてい
る。High burn-up use of fuel is essential for highly efficient use of nuclear reactors, and fuel bodies that can cope with this need are being developed.
高燃料度になるに従い材料の5ec(応力腐食割れ5t
ress Corrosion Crack )は低応
力で発生するようになるため、燃料体を構成する部材に
かかる応力を低くする必要がある。5ec (stress corrosion cracking 5t) of the material as the fuel content increases.
(corrosion crack) occurs at low stress, so it is necessary to reduce the stress applied to the members constituting the fuel body.
従来、燃料要素の上部端栓の断面は円形であシ、スプリ
ングがとの端栓をはさむようにして端栓に装着している
。Conventionally, the upper end plug of a fuel element has a circular cross section and is attached to the end plug in such a manner that a spring is sandwiched between the two end plugs.
膨張スプリングの曲げた部分の根元(第1図中のA部)
には、自由位置からの変位に見合った応力が発生してい
る。The base of the bent part of the expansion spring (section A in Figure 1)
A stress commensurate with the displacement from the free position is generated.
一方、SCCの感受性、すなわちSCCの発生のし易さ
は、U料材料にかかつている応力と照射jkに相関があ
シ、照射量が多くなるに従ってSCCが発生するのに必
要な応力は低くなっている(第2図参照)。On the other hand, the susceptibility to SCC, that is, the ease with which SCC occurs, is correlated with the stress applied to the U material and the irradiation jk, and as the irradiation amount increases, the stress necessary for SCC to occur decreases. (See Figure 2).
したがって、高燃焼度までその材料を利用しようとする
と、材料にかかる応力を低くおさえる必要がある。Therefore, in order to utilize the material to a high burnup, it is necessary to keep the stress applied to the material low.
ところが、上部端栓と膨張スプリングとの場合膨張スプ
リングに発生する応力を低くすると、従来の構造では、
スプリングの押付力を確保できず、また、抜は易くなる
ため、燃料体組立時に支障がでる。However, in the case of the upper end plug and the expansion spring, in order to reduce the stress generated in the expansion spring, in the conventional structure,
Since the pressing force of the spring cannot be secured and it becomes easy to pull out, problems occur when assembling the fuel body.
そこで、本発明では、スプリングの押付力を損わず、か
つ上部端栓に密着してなおかつ、スプリングに発生する
応力は小さくなるような構造をもつ上部端栓を提供する
ことを目的とする。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an upper end plug having a structure that does not impair the pressing force of the spring, is in close contact with the upper end plug, and reduces the stress generated in the spring.
膨張スプリングの押付力と上部端栓への密着性を損わず
に、スプリング内に発生ずる応力を低減し、SCC感受
性を減らすことで高燃焼度に対処可能な上部分端栓を設
ける。To provide an upper end plug capable of coping with high burnup by reducing stress generated in a spring and reducing SCC susceptibility without impairing pressing force of an expansion spring and adhesion to the upper end plug.
膨張スプリングの役割は、燃料要素を押しつける力を発
生することであるから、余分な応力は、このスプリング
を上部端栓に密着するために発生している応力であシ、
この応力を取除くことによって、8CCを発生しない照
射量は増加する。The role of the expansion spring is to generate a force that presses the fuel element, so the extra stress is due to the stress generated to tightly fit this spring to the upper end plug.
By removing this stress, the dose of radiation that does not generate 8CC is increased.
そこで、この余分な応力を取除けるような工夫を上部端
栓にこらし、上部端栓形状を従来のものからに化させた
。Therefore, the upper end plug was devised to remove this extra stress, and the shape of the upper end plug was changed from the conventional one.
膨張スプリングlは、その先が途中から折り曲げられて
、スプリングのつくる円形を横ぎる直径方向に伸びてい
る(第1図参照)。The tip of the expansion spring 1 is bent in the middle and extends in a diametrical direction that traverses the circle formed by the spring (see Fig. 1).
この狭くなった所に上部端栓をはさみ、スズリングは端
栓に密着する。したがつtスプリングの曲げられた部分
2の根元3に応力がie生している。The upper end plug is inserted into this narrowed area, and the tin ring is tightly attached to the end plug. However, stress is generated at the root 3 of the bent portion 2 of the T-spring.
これは、材料から見れば余分な応力である。膨張スプリ
ングは燃料体構成時には、上部タイプレートと燃料要素
の間にはさまれて、燃料要素を押しつけ、その上下方向
の動きを拘束しているため、スプリングの伸縮に伴った
応力がスプリングに発生ずる。スプリングの曲げられた
根元ではこの応力に先の密着のだめの応力が加算され、
スプリング全体で一番応力が高くなる。This is an extra stress from the perspective of the material. When the fuel body is constructed, the expansion spring is sandwiched between the upper tie plate and the fuel element, presses the fuel element, and restrains its vertical movement, so stress is generated in the spring as the spring expands and contracts. arise. At the bent base of the spring, the stress from the previous close contact is added to this stress,
The stress is the highest in the entire spring.
一方、SCCの発生は、応力と照射量に依存してお9(
第2図参照)照射量が多い場ばには低い応力でもSCC
は発生してしまうことがわかる。On the other hand, the occurrence of SCC depends on stress and irradiation dose (9)
(See Figure 2) If the irradiation dose is high, even low stress can cause SCC.
It can be seen that this occurs.
このため、高燃焼度で利用できるためには、膨張スプリ
ング先で曲げた部分の根元の応力を低くする必要がある
。Therefore, in order to be able to use it at a high burnup, it is necessary to lower the stress at the root of the part bent at the end of the expansion spring.
第3図に本発明の実施第1例を示す。FIG. 3 shows a first embodiment of the present invention.
上部端栓に直線部を設は膨張スプリングの曲げた部分に
一致するようになっており、挿入後には、スプリングに
応力が発生しない構造となっている。The straight part of the upper end plug is arranged to match the bent part of the expansion spring, so that no stress is generated in the spring after insertion.
第4図に本発明の実施第2例を示す。FIG. 4 shows a second embodiment of the present invention.
第1例では片面であったものを両面にしたもの。In the first example, it was single-sided, but it is now double-sided.
第5図に本発明の実施第3例を示す。FIG. 5 shows a third embodiment of the present invention.
上部端栓の根元部分のみik線部を設けたもの。An ik line part is provided only at the base of the upper end plug.
第6図に本発明の実施第4例を示す。FIG. 6 shows a fourth embodiment of the present invention.
第3例での直線部を反対側に設けたもの。The straight part in the third example is provided on the opposite side.
第7図に本発明の実施第5例を示す。FIG. 7 shows a fifth embodiment of the present invention.
上部端栓の根元部分を同心円小径にしたもの。The base of the upper end plug has a concentric circle with a small diameter.
第1図に一1従米しUのスプリングの形状図、第2図は
特性線図、第3〜第7図は本発明の実施例の構造図であ
る。
1・・・スプリング、2・・・曲けられた部分、3・・
・根元。
ノー−1−1
、;i −、・
第 1 口
((L)Cb)
/
(C)
茅 2 固
照 計量 (姑′晟屋)
′$3 口
(^)(b)
茅4 図
(久) (b)
茅5 図
(リ (b)(り
茅を図
(リ (b) <C)
$7
(幻 (b:
) (すFIG. 1 is a shape diagram of a spring of 11 U, FIG. 2 is a characteristic diagram, and FIGS. 3 to 7 are structural diagrams of embodiments of the present invention. 1... Spring, 2... Bent part, 3...
·root. No-1-1 , ;i -,・ 1st mouth ((L)Cb) / (C) Kaya 2 Fixed light Measurement (姑'晟屋) '$3 Mouth (^) (b) Kaya 4 Figure (ku) ) (b) (b) (illustration (b) <C) $7 (phantom (b: ) (su)
Claims (1)
部の断面積よシ小さい燃料要素を有することを特徴とす
る燃料体。1. A fuel body characterized in that the upper end plug of the fuel element has a part of the fuel element smaller in cross-sectional area than the other upper end plug part.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58132710A JPS6025489A (en) | 1983-07-22 | 1983-07-22 | Fuel body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58132710A JPS6025489A (en) | 1983-07-22 | 1983-07-22 | Fuel body |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6025489A true JPS6025489A (en) | 1985-02-08 |
Family
ID=15087753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58132710A Pending JPS6025489A (en) | 1983-07-22 | 1983-07-22 | Fuel body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6025489A (en) |
-
1983
- 1983-07-22 JP JP58132710A patent/JPS6025489A/en active Pending
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