JPH0980186A - Sealing device between upper shield body and control-rod-guide tube of high temperature gas reactor - Google Patents
Sealing device between upper shield body and control-rod-guide tube of high temperature gas reactorInfo
- Publication number
- JPH0980186A JPH0980186A JP7259411A JP25941195A JPH0980186A JP H0980186 A JPH0980186 A JP H0980186A JP 7259411 A JP7259411 A JP 7259411A JP 25941195 A JP25941195 A JP 25941195A JP H0980186 A JPH0980186 A JP H0980186A
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- guide tube
- upper shield
- rod guide
- insertion hole
- 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
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
- Gasket Seals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、高温ガス炉の炉心に
おける上部遮へい体と制御棒案内管との間のシール装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device between an upper shield and a control rod guide tube in a core of a high temperature gas reactor.
【０００２】[0002]
【従来の技術】高温ガス炉は、低温のガス冷却黒鉛減速
炉から発展したもので、冷却材の入口温度，出口温度を
高温にして発電用原子炉としての経済性向上を図ったも
のであり、核燃料に被覆燃料粒子を、冷却材にヘリウム
を使用する。高温ガス炉の炉心構造物は、炉心全体を支
持する炉床部、炉心の周囲及び上部に設置される中性子
反射及び高温断熱のための炉内構造物などから構成さ
れ、黒鉛をキー構造を有する適切な形状に加工し、炉内
へ積み上げる構造である。図３は高温ガス炉の縦断面図
である。高温ガス炉は炉心１を圧力容器２に収容し、こ
の炉心１を炉心の下方に位置する高温プレナムブロック
３で支持し、この高温プレナムブロック３を３本のサポ
ートポスト４で支持し、さらにサポートポスト４をプレ
ナム下部ブロック５で支持している。６は制御棒案内
管，７は上部遮へい体ブロック，８は主冷却系配管，９
は補助冷却系配管である。矢印は冷却材の流れを示して
いる。冷却材としてヘリウムを使用し、ヘリウムは高温
ガス炉の下部の主冷却系配管８から圧力容器２内に入
り、圧力容器２の外径側を上昇し、炉の上部から炉心１
を下降して炉心１を冷却するとともに、冷却材は炉心１
で加熱されて高温となり、高温ガスが蒸気発生器へ送ら
れ、蒸気発生器から蒸気を発生させる。プレナムブロッ
ク３の材質は黒鉛で、高温高圧にしなければならないの
で製作可能な黒鉛の大きさには限界があることから、プ
レナムブロック３は小さなブロックの集合体となってい
る。2. Description of the Related Art A high-temperature gas reactor was developed from a low-temperature gas-cooled graphite moderator and was designed to improve the economical efficiency as a nuclear reactor for power generation by increasing the inlet and outlet temperatures of the coolant. Coated fuel particles are used for nuclear fuel and helium is used as a coolant. The core structure of a high temperature gas reactor is composed of a hearth part that supports the entire core, an in-core structure for neutron reflection and high temperature heat insulation installed around and above the core, and has a key structure of graphite. It is a structure that is processed into an appropriate shape and stacked in a furnace. FIG. 3 is a vertical cross-sectional view of the high temperature gas furnace. In a high temperature gas reactor, a core 1 is housed in a pressure vessel 2, the core 1 is supported by a high temperature plenum block 3 located below the core, and the high temperature plenum block 3 is supported by three support posts 4 and further supported. The post 4 is supported by the plenum lower block 5. 6 is a control rod guide pipe, 7 is an upper shield block, 8 is a main cooling system pipe, 9
Is an auxiliary cooling system pipe. The arrows indicate the flow of coolant. Helium is used as a coolant, and the helium enters the pressure vessel 2 through the main cooling system pipe 8 at the bottom of the high temperature gas reactor, rises on the outer diameter side of the pressure vessel 2, and moves from the top of the reactor to the core 1
To cool the core 1 while cooling the core 1
Is heated to high temperature, the high temperature gas is sent to the steam generator, and steam is generated from the steam generator. The material of the plenum block 3 is graphite, and the size of graphite that can be manufactured is limited because it must be made at high temperature and high pressure, so the plenum block 3 is an assembly of small blocks.
【０００３】[0003]
【発明が解決しようとする課題】図４（Ａ）は従来の制
御棒案内管と上部遮へい体との接合部の縦断面図、
（Ｂ）は（Ａ）のＢ−Ｂ断面図、（Ｃ）は制御棒案内管
と上部遮へい体との芯ずれによる隙間を示す図である。
図４（Ａ）において、上部遮へい体７は、３箇の制御棒
挿入孔７ａを備える。制御棒案内管６は制御棒挿入孔７
ａと孔の位置が合うように接触してしいる。制御棒は制
御棒案内管６内を通過して上部遮へい体の制御棒挿入孔
７ａに挿入される。冷却材ヘリウムのこの挿入孔７ａへ
の流量配分は、全流量の４％に制限するよう計画されて
いる。図４（Ｂ）において、円形の制御棒挿入孔７ａは
上部遮へい体７に３箇所穿たれている。図４（Ｃ）に示
すごとく制御棒案内管６と制御棒案内孔７ａとの芯ずれ
を生じたとき、両者の接合面にくさび形の隙間を生じ、
この隙間から計画以上の流量のヘリウムが配分されると
言う欠点があった。FIG. 4A is a vertical sectional view of a joint between a conventional control rod guide tube and an upper shield,
(B) is a cross-sectional view taken along the line BB of (A), and (C) is a diagram showing a gap between the control rod guide tube and the upper shield due to misalignment.
In FIG. 4A, the upper shield 7 has three control rod insertion holes 7a. The control rod guide tube 6 has a control rod insertion hole 7
a and the hole are in contact with each other so that their positions match. The control rod passes through the control rod guide tube 6 and is inserted into the control rod insertion hole 7a of the upper shield. The flow rate distribution of the coolant helium to this insertion hole 7a is planned to be limited to 4% of the total flow rate. In FIG. 4B, three circular control rod insertion holes 7a are formed in the upper shield 7 at three positions. As shown in FIG. 4 (C), when the control rod guide tube 6 and the control rod guide hole 7a are misaligned, a wedge-shaped gap is formed in the joint surface between them.
There was a drawback that helium with a flow rate higher than planned was distributed from this gap.
【０００４】この発明は、制御棒案内管６と上部遮へい
体の制御棒挿入孔７ａとの芯ずれでも、制御棒挿入孔７
ａへヘリウムを計画通り流量配分することができるシー
ル装置を提供することを課題とする。According to the present invention, even if the control rod guide tube 6 and the control rod insertion hole 7a of the upper shield body are misaligned with each other, the control rod insertion hole 7 is not formed.
It is an object of the present invention to provide a sealing device that can distribute the flow rate of helium to a as planned.
【０００５】[0005]
【課題を解決するための手段】制御棒挿入孔を有する上
部遮へい体の上に制御棒案内管を重ねて構成され、前記
制御棒案内管及び前記制御棒挿入孔に制御棒を挿入する
高温ガス炉において、前記制御棒案内管の下部に当てら
れたフランジと、その内径が前記制御棒案内管の内径に
ほぼ等しい円筒部とを有するシールリングと、前記フラ
ンジの下部と前記上部遮へい体の上部との間に取り付け
られた複数のばねとからなり、前記制御棒案内管と前記
上部遮へい体との間に隙間を生じたとき、前記シールリ
ングのフランジが前記制御棒案内管の下部に接しながら
変位するようにした。この発明においては、制御棒案内
管の下部に内径が制御棒案内管の内径とほぼ等しいシー
ルリングを当てたので、制御棒案内管の面と上部遮へい
体の上部との隙間からヘリウムが流入することはない。
また、シールリングの円筒部と制御棒挿入孔との間には
シールリングが傾くだけの隙間があればよいので、両者
間の隙間は制御棒案内管と上部遮へい体のくさび形の隙
間に比べて充分狭くなる。その結果くさび形の隙間を生
じてもヘリウムが制御棒挿入孔へ漏れ込むのを制限する
ことができる。A high temperature gas having a control rod guide tube superposed on an upper shield having a control rod insertion hole and having a control rod inserted into the control rod guide tube and the control rod insertion hole. In the furnace, a seal ring having a flange applied to a lower portion of the control rod guide tube, a cylindrical portion having an inner diameter substantially equal to the inner diameter of the control rod guide tube, a lower portion of the flange and an upper portion of the upper shield body. A plurality of springs mounted between the control rod guide tube and the upper shield, and when a gap is formed between the control rod guide tube and the upper shield, the flange of the seal ring contacts the lower portion of the control rod guide tube. It was made to displace. In the present invention, since the seal ring having the inner diameter substantially equal to the inner diameter of the control rod guide tube is applied to the lower portion of the control rod guide tube, helium flows in from the gap between the surface of the control rod guide tube and the upper portion of the upper shield. There is no such thing.
Also, it is sufficient if there is a gap between the cylindrical part of the seal ring and the control rod insertion hole so that the seal ring is tilted.Therefore, the gap between them is less than the wedge-shaped gap between the control rod guide tube and the upper shield. Becomes narrow enough. As a result, even if a wedge-shaped gap is created, helium can be restricted from leaking into the control rod insertion hole.
【０００６】[0006]
【発明の実施の形態】図１はこの発明の上部遮へい体と
制御棒案内管とのシール装置の原理を示す縦断面図であ
る。図１において図４と同じ部位は同じ符号を付してあ
る。この発明においては、制御棒案内管６の下部に当て
られたフランジ１０ａと、その内径が制御棒案内管６の
内径にほぼ等しい円筒部１０ｂとを有するシールリング
１０と、フランジ１０ａの下部と上部遮へい体７の上部
との間に取り付けられた３箇のばね１１とからなるシー
ル装置を設けた。上部遮へい体の制御棒挿入孔７ａの上
部に制御棒挿入孔７ａより内径が大きいシールリング挿
入孔１２が設けられ、シールリング１１はシールリング
挿入孔１２へ挿入される。1 is a longitudinal sectional view showing the principle of a sealing device for an upper shield and a control rod guide tube according to the present invention. 1, the same parts as those in FIG. 4 are designated by the same reference numerals. In the present invention, the seal ring 10 having the flange 10a applied to the lower portion of the control rod guide tube 6 and the cylindrical portion 10b whose inner diameter is substantially equal to the inner diameter of the control rod guide tube 6, and the lower and upper portions of the flange 10a. A sealing device consisting of three springs 11 mounted between the shield 7 and the upper part thereof was provided. A seal ring insertion hole 12 having an inner diameter larger than that of the control rod insertion hole 7a is provided above the control rod insertion hole 7a of the upper shield, and the seal ring 11 is inserted into the seal ring insertion hole 12.
【０００７】図２（Ａ）はこの発明のシール装置の実施
の形態を示す縦断面図、（Ｂ）は（Ａ）のＢ−Ｂ断面図
である。図２（Ａ）において、上部遮へい体７は黒鉛の
上部並びに側面がオーステナイト系ステンレス鋼で被わ
れ、中央にブロックつかみ孔１３を備えている。図２
（Ａ），（Ｂ）の例はシールリング１０を制御棒案内管
６の下部に当て、シールリングのフランジ１０ａと上部
遮へい体の制御棒挿入孔７ａの上部との間に３箇のばね
１１を取り付けた。制御棒案内管６と上部遮へい体の制
御棒挿入孔との芯がずれても、シールリングはフランジ
１０ａが制御棒案内管６の下部に当てられて変位するの
で、ここからヘリウムが漏れることはない。また、シー
ルリングの円筒部１０ｂとシールリング挿入孔１２との
間にはシールリングが傾くだけの隙間があればよいの
で、両者間の隙間は制御棒案内管６と上部遮へい体７と
の間のくさび形の隙間に比べて充分狭くなり、ヘリウム
に対する必要な流路抵抗を確保できる。シールリング１
０は上部遮へい体に支持されたシールリング押さえ１４
によって上部遮へい体７から飛び出さないように押さえ
られている。上部遮へい体７の上に制御棒案内管６を積
み上げたときには、シールリング１０が制御棒案内管６
の下部に接触するように構成されている。図２（Ａ）に
は図示していないが、制御棒案内管６の下部にシールリ
ングのフランジ１０ａがはまる窪みを備え、この窪みに
シールリングのフランジ１０ａがはまるように構成され
ている。図２（Ａ），（Ｂ）の例とは逆にシールリング
１０を上部遮へい体へ押し当て、シールリングの円筒部
１０ｂを制御棒案内管６へ挿入するようにし、ばね１１
を制御棒案内管６と上部遮へい体７へ当てたシールリン
グのフランジ１０ａとの間に取り付けても、図２
（Ａ），（Ｂ）と同様にシールすることができる。FIG. 2A is a vertical sectional view showing an embodiment of the sealing device of the present invention, and FIG. 2B is a sectional view taken along the line BB of FIG. In FIG. 2 (A), the upper shield 7 is covered with austenitic stainless steel on the upper and side surfaces of graphite, and has a block holding hole 13 in the center. FIG.
In the examples of (A) and (B), the seal ring 10 is applied to the lower portion of the control rod guide pipe 6, and three springs 11 are provided between the flange 10a of the seal ring and the upper portion of the control rod insertion hole 7a of the upper shield. Attached. Even if the control rod guide tube 6 and the control rod insertion hole of the upper shield are displaced from each other, the seal ring is displaced by the flange 10a being applied to the lower portion of the control rod guide tube 6, so that helium does not leak from here. Absent. Further, since there is only a gap between the seal ring cylindrical portion 10b and the seal ring insertion hole 12 so that the seal ring is tilted, the gap between the two is between the control rod guide tube 6 and the upper shield 7. It is sufficiently narrower than the wedge-shaped gap, and the required flow path resistance to helium can be secured. Seal ring 1
0 is the seal ring holder 14 supported by the upper shield
It is pressed by the upper shield 7 so as not to jump out. When the control rod guide tube 6 is piled up on the upper shield 7, the seal ring 10 moves the control rod guide tube 6
Is configured to contact the bottom of the. Although not shown in FIG. 2 (A), the control rod guide tube 6 is provided at its lower portion with a recess into which the flange 10a of the seal ring fits, and the flange 10a of the seal ring fits into this recess. Contrary to the example shown in FIGS. 2A and 2B, the seal ring 10 is pressed against the upper shield so that the cylindrical portion 10b of the seal ring is inserted into the control rod guide tube 6, and the spring 11
2 is attached between the control rod guide tube 6 and the flange 10a of the seal ring applied to the upper shield 7,
It can be sealed in the same manner as (A) and (B).
【０００８】[0008]
【発明の効果】この発明によれば、シールリングのフラ
ンジを制御棒案内管の下部に当て、シールリングを上部
遮へい体の制御棒挿入孔の上部のシールリング挿入孔に
挿入し、フランジの下部とシールリング挿入孔の上部と
の間に複数のばねを取り付け、シールリングを制御棒案
内管の下部に接しながら変位させたので、制御棒案内管
と制御棒挿入孔との芯がずれても、シールリングとシー
ルリング挿入孔との隙間は充分狭くなって、ヘリウムの
制御棒挿入孔へ流入する量を制限することができる。According to the present invention, the flange of the seal ring is applied to the lower portion of the control rod guide tube, the seal ring is inserted into the seal ring insertion hole above the control rod insertion hole of the upper shield, and the lower portion of the flange is inserted. Since a plurality of springs were attached between the control rod guide tube and the upper part of the seal ring insertion hole and the seal ring was displaced while contacting the lower part of the control rod guide tube, even if the cores of the control rod guide tube and the control rod insertion hole are misaligned. The gap between the seal ring and the seal ring insertion hole is sufficiently narrowed to limit the amount of helium flowing into the control rod insertion hole.
【図１】この発明の上部遮へい体と制御棒案内管とのシ
ール装置の原理を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing the principle of a sealing device for an upper shield and a control rod guide tube according to the present invention.
【図２】（Ａ）はこの発明のシール装置の実施の形態を
示す縦断面図、（Ｂ）は（Ａ）のＢ−Ｂ断面図である。FIG. 2A is a vertical sectional view showing an embodiment of a sealing device of the present invention, and FIG. 2B is a sectional view taken along line BB of FIG.
【図３】高温ガス炉の縦断面図である。FIG. 3 is a vertical sectional view of a high temperature gas furnace.
【図４】（Ａ）は従来の制御棒案内管と上部遮へい体と
の接合部の縦断面図、（Ｂ）は（Ａ）のＢ−Ｂ断面図、
（Ｃ）は制御棒案内管と上部遮へい体との芯ずれによる
隙間を示す図である。4A is a vertical cross-sectional view of a joint between a conventional control rod guide tube and an upper shield, FIG. 4B is a cross-sectional view taken along line BB of FIG.
(C) is a diagram showing a gap between the control rod guide tube and the upper shield due to misalignment.
１ 炉心 ２ 圧力容器 ３ 高温プレナムブロック ４ サポートポスト ５ プレナム下部ブロック ６ 制御棒案内管 ７ 上部遮へい体 ７ａ 制御棒挿入孔 ８ 主冷却系配管 ９ 補助冷却系配管 １０ シールリング １０ａ フランジ １０ｂ 円筒部 １１ ばね １２ シールリング挿入孔 1 Core 2 Pressure Vessel 3 High Temperature Plenum Block 4 Support Post 5 Plenum Lower Block 6 Control Rod Guide Tube 7 Upper Shield 7a Control Rod Insertion Hole 8 Main Cooling System Piping 9 Auxiliary Cooling System Piping 10 Seal Ring 10a Flange 10b Cylindrical Section 11 Spring 12 Seal ring insertion hole
Claims (1)
制御棒案内管を重ねて構成され、前記制御棒案内管及び
前記制御棒挿入孔に制御棒を挿入する高温ガス炉におい
て、前記制御棒案内管の下部に当てられたフランジと、
その内径が前記制御棒案内管の内径にほぼ等しい円筒部
とを有するシールリングと、前記フランジの下部と前記
上部遮へい体の上部との間に取り付けられた複数のばね
とからなり、前記制御棒案内管と前記上部遮へい体との
間に隙間を生じたとき、前記シールリングのフランジが
前記制御棒案内管の下部に接しながら変位することを特
徴とする高温ガス炉の上部遮へい体と制御棒案内管との
シール装置。1. A high temperature gas furnace comprising: a control rod guide tube superposed on an upper shield having a control rod insertion hole; and a control rod inserted into the control rod guide tube and the control rod insertion hole. A flange applied to the bottom of the control rod guide tube,
The control rod comprises a seal ring having an inner diameter substantially equal to the inner diameter of the control rod guide tube, and a plurality of springs mounted between the lower portion of the flange and the upper portion of the upper shield. When a gap is created between the guide pipe and the upper shield, the flange of the seal ring is displaced while being in contact with the lower portion of the control rod guide pipe, and the upper shield and the control rod of the high temperature gas reactor are characterized. Sealing device for guide tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25941195A JP3446855B2 (en) | 1995-09-12 | 1995-09-12 | Sealing device for the upper shield of the HTGR and the control rod guide tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25941195A JP3446855B2 (en) | 1995-09-12 | 1995-09-12 | Sealing device for the upper shield of the HTGR and the control rod guide tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0980186A true JPH0980186A (en) | 1997-03-28 |
| JP3446855B2 JP3446855B2 (en) | 2003-09-16 |
Family
ID=17333747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25941195A Expired - Fee Related JP3446855B2 (en) | 1995-09-12 | 1995-09-12 | Sealing device for the upper shield of the HTGR and the control rod guide tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3446855B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378091A (en) * | 2018-11-12 | 2019-02-22 | 中国原子能科学研究院 | A kind of control rod guide tubes and bundles structure |
-
1995
- 1995-09-12 JP JP25941195A patent/JP3446855B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378091A (en) * | 2018-11-12 | 2019-02-22 | 中国原子能科学研究院 | A kind of control rod guide tubes and bundles structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3446855B2 (en) | 2003-09-16 |
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