JPS6331078B2 - - Google Patents
Info
- Publication number
- JPS6331078B2 JPS6331078B2 JP56065013A JP6501381A JPS6331078B2 JP S6331078 B2 JPS6331078 B2 JP S6331078B2 JP 56065013 A JP56065013 A JP 56065013A JP 6501381 A JP6501381 A JP 6501381A JP S6331078 B2 JPS6331078 B2 JP S6331078B2
- Authority
- JP
- Japan
- Prior art keywords
- plug
- convection
- heat insulating
- heat
- insulating shell
- 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
Links
- 238000009413 insulation Methods 0.000 claims description 27
- 230000002265 prevention Effects 0.000 claims description 26
- 230000001133 acceleration Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 10
- 230000008646 thermal stress Effects 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000002826 coolant Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002093 peripheral 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
- Thermal Insulation (AREA)
Description
【発明の詳細な説明】 本発明は高速増殖炉の遮蔽プラグに関する。[Detailed description of the invention] The present invention relates to a shielding plug for a fast breeder reactor.
一般に高速増殖炉は第１図に示す如く構成され
ている。すなわち、１は原子炉容器であつて、こ
の原子炉容器１内には炉心２が収容されている。
そして、液体ナトリウム等の冷却材は入口管３か
ら流入して炉心２を上方に通過して加熱され、出
口管４から流出し、中間熱交換器（図示せず）と
熱交換してふたたび入口管３から原子炉容器１内
に戻されるように構成されている。そして、この
原子炉容器１の上端は遮蔽プラグ５によつて閉塞
されている。この遮蔽プラグ５は原子炉容器１側
に固定された固定プラグ６とこの固定プラグ６に
偏心して回転自在に設けられた回転プラグ７とか
ら構成され、この回転プラグ７には炉心上部機構
８や燃料交換機９等が装着されている。ところ
で、上記遮蔽プラグ５はその下面が原子炉容器１
内の高温に曝されるので、この熱が上面まで伝わ
り、制御棒駆動機構や燃料交換機の温度上昇を招
く不具合があつた。このような不具合を防止する
ため、第１図に示す如く固定プラグ６や回転プラ
グ７のプラグ本体下面に中空容器状の断熱胴１０
………設け、この断熱胴１０………内には内部で
の対流を防止するため複数の対流防止板１１……
…を重ねて配置し、原子炉容器１内の熱が固定プ
ラグ６や回転プラグ７等に伝達するのを防止する
ように構成されている。しかし、上記断熱胴１０
………および対流防止板１１………は原子炉の運
転によつて大きな熱変形が生じるので、この熱変
形により対流防止板１１………と断熱胴１０……
…とが干渉し、破損する可能性がある。このた
め、これら対流防止板１１………の周縁と断熱胴
１０………の側壁内面との間に間隙を形成してお
り、両者の干渉を防止するように構成されてい
た。しかし、このように間隙を設けるとこの間隙
を通して断熱胴内のガスが対流を生じ、断熱効果
を損なうばかりでなく、第２図に示す如く断熱胴
１０………の高さ方向に不均一な温度勾配を生
じ、この断熱胴１０………に過大な熱応力が発生
する不具合があつた。 Generally, a fast breeder reactor is constructed as shown in FIG. That is, 1 is a nuclear reactor vessel, and a reactor core 2 is accommodated within this reactor vessel 1.
Coolant such as liquid sodium flows in from the inlet pipe 3, passes upward through the core 2, is heated, flows out from the outlet pipe 4, exchanges heat with an intermediate heat exchanger (not shown), and returns to the inlet. It is configured to be returned into the reactor vessel 1 from the tube 3. The upper end of this reactor vessel 1 is closed by a shielding plug 5 . This shielding plug 5 is composed of a fixed plug 6 fixed to the reactor vessel 1 side and a rotary plug 7 eccentrically provided to the fixed plug 6 so as to be freely rotatable. A fuel exchanger 9 etc. are installed. By the way, the lower surface of the above-mentioned shielding plug 5 is connected to the reactor vessel 1.
As the fuel was exposed to high temperatures inside, this heat was transmitted to the top surface, causing a problem in which the temperature of the control rod drive mechanism and fuel exchanger increased. In order to prevent such problems, as shown in FIG.
...... is provided, and inside this heat insulating shell 10, a plurality of convection prevention plates 11... are provided to prevent convection inside.
... are arranged one on top of the other to prevent heat within the reactor vessel 1 from being transmitted to the fixed plug 6, rotating plug 7, etc. However, the above-mentioned heat insulation shell 10
. . . and convection prevention plate 11 .
... may interfere and cause damage. For this reason, a gap is formed between the periphery of these convection prevention plates 11 and the inner surface of the side wall of the heat insulating shell 10, so as to prevent interference between the two. However, when a gap is provided in this way, the gas inside the heat insulating shell causes convection through this gap, which not only impairs the insulation effect but also causes unevenness in the height direction of the heat insulating shell 10 as shown in Fig. 2. There was a problem in that a temperature gradient was generated and excessive thermal stress was generated in the heat insulating shell 10.
本発明は以上の事情にもとづいてなされたもの
で、その目的とするところは断熱胴に生じる熱応
力を低減でき、最大の断熱性能が得られる高速増
殖炉の遮蔽プラグを提供することにある。 The present invention has been made based on the above circumstances, and its purpose is to provide a shielding plug for a fast breeder reactor that can reduce the thermal stress generated in the heat insulating shell and provide maximum heat insulation performance.
以下本発明を第３図および第４図に示す一実施
例にしたがつて説明する。図中１０１は原子炉容
器であつて、この原子炉容器１０１内には炉心１
０２が収容されている。そして、液体ナトリウム
等の冷却材は入口管１０３からこの原子炉容器１
０１内下部に流入し、炉心１０２を上方に通過し
て加熱され、出口管１０４から流出するように構
成されている。そして、この出口管１０４から流
出した高温の冷却材は中間熱交換器で二次冷却材
と熱交換され、入口管１０３からふたたび原子炉
容器１０１内下部に流入するように構成されてい
る。そして、この原子炉容器１０１の上端は遮蔽
プラグ１０５によつて閉塞されている。この遮蔽
プラグ１０５は固定プラグ１０６および回転プラ
グ１０７を備え、固定プラグ１０６は原子炉容器
１０１の上端に固定されている。また、上記回転
プラグ１０７は固定プラグ１０６上にその中心か
ら偏心して設けられ、軸受１０８によつて回転自
在に支持され、また固定プラグ１０６との間の気
密はフリーズシール機構１０９により維持される
ように構成されている。そして、この回転プラグ
１０７上には炉心上部機構１１０、制御棒駆動機
構１１１、燃料交換機１１２等が取付けられてい
る。なお、１１３はこの回転プラグ１０７を回転
駆動する回転駆動機構である。そして、上記固定
プラグ１０６および回転プラグ１０７の下面には
それぞれ原子炉容器１０１内からの熱を断熱する
断熱胴１１４，１１４が取付けられている。これ
ら断熱胴１１４は中空の容器状をなし、内部には
原子炉容器１０１内のカバーガスと同種のガスた
とえばアルゴンガスが封入されている。なお、実
際のものではこの断熱胴１１４，１１４の一部に
小径の連通孔が形成され、この連通孔によつて断
熱胴１１４，１１４内の圧力とカバーガス空間の
圧とが同圧に維持されている。そして、これら断
熱胴１１４，１１４内にはそれぞれ対流防止板１
１５………が設けられている。これら対流防止板
１１５………は上下方向に互に水平に設けられて
いる。そして、上記固定プラグ１０６および回転
プラグ１０７内に収容されている遮蔽部材１１６
………からは下方に向けて取付ボルト１１７……
…が実設されており、この取付ボルト１１７……
…は対流防止板１１５………を貫通している。ま
た、この取付ボルト１１７………を囲んで対流防
止板１１７………間には所定長さのスペーサ１１
８………が挿入されている。そして、この取付ボ
ルト１１７………の下端部にはナツト１１９……
…が装着され、このナツト１１９………を締付け
ることによりスペーサ１１８………間で対流防止
板１１５………を挾圧保持し、これら対流防止板
１１５………を所定間隙で保持している。そし
て、上記断熱胴１１４内に封入されている気体
（アルゴンガス）の動粘性係数をｖ、その体積膨
脹率をβ、同じくプラントル数をPr、動力加速
度をｇ、上記断熱胴１１４の内面の高さをＬ、同
じく断熱胴１１４の上端と下端との温度差をΔT
としたとき、運転時における上記対流防止板１１
５の周縁と断熱胴１１４の側壁内面との距離ｄお
よび各対流防止板１１５の上下方向の距離ｈは
ｄ≦3.83×（v2・Ｌ／ｇ・β・ΔT・Pr）1/4………(1
)
ｈ≦（1710×v2／ｇ・β・ΔT・Pr）1/3 ………(2)
に設定されている。 The present invention will be explained below with reference to an embodiment shown in FIGS. 3 and 4. In the figure, 101 is a reactor vessel, and inside this reactor vessel 101 is a reactor core 1.
02 is accommodated. Coolant such as liquid sodium is supplied to the reactor vessel 1 from the inlet pipe 103.
01, passes upward through the reactor core 102, is heated, and flows out from the outlet pipe 104. The high-temperature coolant flowing out from the outlet pipe 104 is heat-exchanged with the secondary coolant in an intermediate heat exchanger, and then flows into the lower part of the reactor vessel 101 from the inlet pipe 103 again. The upper end of this reactor vessel 101 is closed by a shielding plug 105. This shielding plug 105 includes a fixed plug 106 and a rotating plug 107, and the fixed plug 106 is fixed to the upper end of the reactor vessel 101. Further, the rotary plug 107 is provided eccentrically from the center on the fixed plug 106 and is rotatably supported by a bearing 108, and the airtightness between the rotary plug 107 and the fixed plug 106 is maintained by a freeze seal mechanism 109. It is composed of A core upper mechanism 110, a control rod drive mechanism 111, a fuel exchanger 112, etc. are mounted on this rotating plug 107. Note that 113 is a rotational drive mechanism that rotationally drives this rotary plug 107. Insulating shells 114, 114 for insulating heat from inside the reactor vessel 101 are attached to the lower surfaces of the stationary plug 106 and rotating plug 107, respectively. These heat insulating shells 114 have a hollow container shape, and a gas of the same type as the cover gas in the reactor vessel 101, such as argon gas, is sealed inside. In the actual case, a small diameter communication hole is formed in a part of the heat insulation shells 114, 114, and the pressure inside the heat insulation shells 114, 114 and the pressure in the cover gas space are maintained at the same pressure by this communication hole. has been done. Inside these heat insulating shells 114, 114, there is a convection prevention plate 1, respectively.
15...... are provided. These convection prevention plates 115 are provided horizontally in the vertical direction. A shielding member 116 accommodated in the fixed plug 106 and the rotating plug 107
......Mounting bolt 117 downwards...
... is actually installed, and this mounting bolt 117...
... passes through the convection prevention plate 115. In addition, a spacer 11 of a predetermined length is provided between the convection prevention plate 117 surrounding the mounting bolt 117.
8...... has been inserted. At the lower end of this mounting bolt 117...... there is a nut 119...
... is installed, and by tightening this nut 119, the convection prevention plates 115 are held under pressure between the spacers 118, and these convection prevention plates 115 are held at a predetermined gap. There is. Then, the kinematic viscosity coefficient of the gas (argon gas) sealed in the heat insulating shell 114 is v, its volume expansion coefficient is β, the Prandtl number is Pr, the power acceleration is g, and the height of the inner surface of the heat insulating shell 114 is Similarly, the temperature difference between the upper and lower ends of the insulation shell 114 is ΔT.
When the above-mentioned convection prevention plate 11 during operation
The distance d between the periphery of No. 5 and the inner surface of the side wall of the heat insulating shell 114 and the vertical distance h of each convection prevention plate 115 are: d≦3.83×(v 2 L/g β ΔT Pr) 1/4 ... …(1
) h≦(1710×v 2 /g・β・ΔT・Pr) 1/3 ………(2) is set.
以上の如く構成された本発明の一実施例は固定
プラグ１０６および回転プラグ１０７の下面に中
空容器状の断熱胴１１４，１１４が設けられ、こ
の断熱胴１１４，１１４内には気体が封入され、
また対流防止板によつてこの気体の対流が防止さ
れるので原子炉容器１０１内の熱が固定プラグ１
０６や回転プラグ１０７に伝えられることが防止
される。また、本実施例では運転時における対流
防止板１１５の周縁と断熱胴１１４の側壁内面と
の間は距離ｄだけ離れているので、断熱胴１１４
内に生ずるガスの対流によつて断熱性能が損われ
ることもない。すなわち、上記の如き断熱胴１１
４，１１４内に対流防止板１１５………を設けた
ものにおいて、上記ｄの値と断熱性能との関係を
調べた結果、第６図に示す如き結果を得た。すな
わち、第６図の曲線Ａは直径500mm、高さ150mmの
円筒状の断熱胴内に厚さ５mmの対流防止板を10枚
等間隙に設け、この対流防止板の周縁と断熱胴の
側壁内面との距離ｄを変えた場合の断熱性能を調
べたものである。また、曲線Ｂは断熱胴の高さを
1000mm、対流防止板の枚数を30枚とした場合のも
のである。そして、この第６図の結果から明らか
なようにｄの値が小さい間は対流がほとんど生ぜ
ず、最大の断熱性能R0を発揮するが、あるｄの
値dcを境としてこれ以上ｄが増大すると対流が生
じて断熱性能が急激に減少する。そして、このdc
の一般的な値を求めたところ、
dc＝3.83×（v2・Ｌ／ｇ・β・ΔT・Pr）1/4………(3
)
が得られた、そして、ｄがこのdc以下であればほ
とんど対流は生じることがなく、加熱胴の上下の
温度分布は第５図の曲線Ｃの如くなり、ほぼ一定
の温度勾配となる。したがつてｄ≦dcとなるよう
にすれば最大の断熱性能が得られ、かつ断熱胴に
生じる熱応力も低減する。また、上記ｄをdcより
わずかに大きくすると断熱胴内でわずかに対流が
生じ、断熱性能が少し低下するが、このわずかな
対流のため断熱胴の上下方向の温度分布が第５図
に示す直線Ｄの如く直線状となり、温度勾配が一
定となり断熱胴に生じる熱応力が最小となる。そ
して、この直線Ｄの如き特性を示す場合のd1を求
めたところ
d1＝1.4dc ………(4)
であつた。なお、このd1の場合の断熱性能は第６
図から明らかなように約0.8程度であり、この程
度の断熱性能の低下は実用上支障は生じない。し
たがつて、ｄをd1以下、すなわち
ｄ≦1.4×3.83×（v2・Ｌ／ｇ・β・ΔT・Pr）1/4……
…(1)
とすることにより最大の断熱性能が得られるとと
もにほぼ一定の温度勾配が得られて熱応力が小さ
くなり、あるいは断熱性能は多少低下するが温度
勾配が一定となつて熱応力が最小となり、いずれ
も遮蔽プラグの断熱構造としてはきわめて好まし
い特性が得られる。なお、実際の高速増殖炉の場
合、断熱胴１１４の高さは約1000mm程度となり、
実際の炉の条件から算出するとdc≒20mmとなる。
ただし、現在までの試作および実験の結果から、
直径2.5ｍの遮蔽プラグの場合にはｄの値は５mm
以上であることが好ましい。また、上記対流防止
板１１５………間の上下方向の距離ｈが大である
とこれら対流防止板１１５………間で対流を生
じ、断熱性能を損なう。そして、これら対流防止
板１１５………間で対流が生じない限界のhcを求
めたところ、
hc＝（1710v2／ｇ・β・ΔT・Pr）1/3 ………(5)
が得られた。また、この対流防止板１１５………
の間でも少し対流を生じた方が前述と同様に対流
防止板１１５………の温度がより均一となり、こ
の温度分布が均一になる場合のh1は前述と同様に
h1＝1.4hc ………(6)
であつた。したがつてこのｈは
ｈ≦1.4×（1710v2／ｇ・β・ΔT・Pr）1/3………(2)
とすることにより最大の断熱性能あるいは最小の
熱応力が得られる。 In one embodiment of the present invention configured as described above, hollow container-shaped heat insulating shells 114, 114 are provided on the lower surfaces of the fixed plug 106 and the rotating plug 107, and gas is sealed in the heat insulating shells 114, 114.
In addition, since the convection of this gas is prevented by the convection prevention plate, the heat inside the reactor vessel 101 is transferred to the fixed plug 1.
06 and the rotating plug 107. Further, in this embodiment, since the peripheral edge of the convection prevention plate 115 and the inner surface of the side wall of the heat insulating shell 114 are separated by a distance d during operation, the heat insulating shell 114
The heat insulation performance is not impaired by the gas convection that occurs inside. That is, the heat insulating shell 11 as described above
As a result of investigating the relationship between the value of d and the heat insulation performance in the case where the convection prevention plate 115 was provided in the inside of the convection plate 115, the results shown in FIG. 6 were obtained. In other words, curve A in Fig. 6 indicates that ten convection prevention plates of 5 mm thickness are provided at equal intervals in a cylindrical heat insulation shell with a diameter of 500 mm and a height of 150 mm, and the periphery of the convection prevention plates and the inner surface of the side wall of the heat insulation shell are This study investigated the insulation performance when the distance d between the Also, curve B represents the height of the insulation shell.
This is when the diameter is 1000 mm and the number of convection prevention plates is 30. As is clear from the results shown in Figure 6, when the value of d is small, almost no convection occurs and the maximum insulation performance R0 is achieved, but beyond a certain value dc , when d is When it increases, convection occurs and the insulation performance decreases rapidly. And this d c
When we found the general value of
) is obtained, and if d is less than this d c , almost no convection will occur, and the temperature distribution above and below the heating cylinder will look like curve C in Figure 5, resulting in an almost constant temperature gradient. . Therefore, if d≦d c is satisfied, the maximum heat insulating performance can be obtained, and the thermal stress generated in the heat insulating shell can also be reduced. Furthermore, if the above d is slightly larger than d c , a slight convection will occur within the heat insulating shell, and the insulation performance will decrease slightly, but due to this slight convection, the temperature distribution in the vertical direction of the heat insulating shell is shown in Figure 5. It becomes a straight line like straight line D, the temperature gradient is constant, and the thermal stress generated in the heat insulating shell is minimized. Then, when d 1 in the case of exhibiting characteristics like this straight line D was found, d 1 =1.4d c (4). In addition, the insulation performance in this case of d 1 is the 6th
As is clear from the figure, it is about 0.8, and this degree of decrease in insulation performance does not cause any practical problems. Therefore, d must be less than or equal to d 1 , that is, d≦1.4×3.83×(v 2 L/g β ΔT Pr) 1/4 ...
…(1) By doing so, the maximum insulation performance can be obtained and a nearly constant temperature gradient can be obtained, reducing thermal stress, or the insulation performance can be slightly lowered, but the temperature gradient can be constant and thermal stress can be minimized. In either case, extremely favorable characteristics can be obtained as a heat insulating structure for a shielding plug. In addition, in the case of an actual fast breeder reactor, the height of the insulation shell 114 is approximately 1000 mm,
Calculated from the actual furnace conditions, d c ≒20 mm.
However, from the results of prototypes and experiments to date,
For a shielding plug with a diameter of 2.5 m, the value of d is 5 mm.
It is preferable that it is above. Furthermore, if the distance h in the vertical direction between the convection prevention plates 115 is large, convection will occur between the convection prevention plates 115, impairing the heat insulation performance. Then, when we calculated the limit h c at which no convection occurs between these convection prevention plates 115, we found that h c = (1710v 2 /g・β・ΔT・Pr) 1/3 (5) Obtained. In addition, this convection prevention plate 115...
The temperature of the convection prevention plate 115 will be more uniform if a small amount of convection occurs between them, as described above, and when this temperature distribution becomes uniform, h 1 is the same as described above, h 1 = 1.4h c ......(6) It was. Therefore, by setting this h to h≦1.4×(1710v 2 /g・β・ΔT・Pr) 1/3 (2), the maximum heat insulation performance or the minimum thermal stress can be obtained.
なお、本発明は必らずしも上記の一実施例には
限定されない。 Note that the present invention is not necessarily limited to the above embodiment.
たとえば上記ｈの値が断熱性能および熱応力に
与える影響はｄの値の場より小さいので、このｈ
の値は必らずしも上記一実施例の範囲になくても
よい。 For example, the influence of the value of h on the insulation performance and thermal stress is smaller than that of the value of d, so this h
The value of does not necessarily have to be within the range of the above embodiment.
また、断熱胴の形状、対流防止板の支持構造等
は必らずしも上記の一実施例には限定されない。 Further, the shape of the heat insulating shell, the support structure of the convection prevention plate, etc. are not necessarily limited to the above embodiment.
上述の如く本発明は、運転時における対流防止
板の周縁と断熱胴の側壁内面との距離ｄを
ｄ≦3.83×（v2・Ｌ／ｇ・β・ΔT・Pr）1/4
に設定したので、断熱胴に生じる熱応力を低減で
き、最大の断熱性能を得ることができる。 As described above, in the present invention, the distance d between the periphery of the convection prevention plate and the inner surface of the side wall of the heat insulating shell during operation is set to d≦3.83×(v 2 L/g β ΔT Pr) 1/4. Therefore, the thermal stress generated in the heat insulating shell can be reduced and maximum heat insulating performance can be obtained.
第１図は従来例の縦断面図、第２図は従来の断
熱胴の温度分布を示す線図である。第３図および
第４図は本発明の一実施例を示し、第３図は縦断
面図、第４図は断熱胴の一部の縦断面図である。
また、第５図はこの一実施例の断熱胴の温度分布
を示す線図、第６図はｄの値と断熱性能との関係
を示す線図である。
１０１……原子炉容器、１０２……炉心、１０
５……遮蔽プラグ、１０６……固定プラグ、１０
７……回転プラグ、１１４……断熱胴、１１５…
…対流防止板、１１７……取付ボルト、１１８…
…スペーサ、１１９……ナツト。
FIG. 1 is a longitudinal sectional view of a conventional example, and FIG. 2 is a diagram showing the temperature distribution of a conventional heat insulating shell. 3 and 4 show an embodiment of the present invention, with FIG. 3 being a longitudinal sectional view and FIG. 4 being a longitudinal sectional view of a part of the heat insulating shell.
Further, FIG. 5 is a diagram showing the temperature distribution of the heat insulating shell of this embodiment, and FIG. 6 is a diagram showing the relationship between the value of d and the heat insulation performance. 101...Reactor vessel, 102...Reactor core, 10
5... Shielding plug, 106... Fixed plug, 10
7...Rotating plug, 114...Insulating shell, 115...
...Convection prevention plate, 117...Mounting bolt, 118...
...Spacer, 119...Natsuto.
Claims (1)
断面胴と、この断熱胴内に上下方向に互いに離間
して水平に設けられた複数の対流防止板とを備
え、上記断熱胴内に封入されている気体の動粘性
係数をｖ、その体積膨脹率をβ、同じくプラント
ル数をPr、重量加速度をｇ、上記断熱胴の内面
の高さをＬ、同じく断熱胴の上端と下端との温度
差をΔTとしたとき、運転時における上記対流防
止板の周縁と断熱胴の側壁内面との距離ｄを ｄ≦3.83×（v2・Ｌ／ｇ・β・ΔT・Pr）1/4 に設定したことを特徴とする高速増殖炉の遮蔽プ
ラグ。[Scope of Claims] 1. A plug including a hollow container-like cross-sectional body provided on the lower surface of the plug body, and a plurality of convection prevention plates provided horizontally and spaced apart from each other in the vertical direction within this heat-insulating body, The kinematic viscosity coefficient of the gas sealed in the insulation shell is v, its volumetric expansion coefficient is β, the Prandtl number is Pr, the weight acceleration is g, the height of the inner surface of the insulation shell is L, and the upper end of the insulation shell is When the temperature difference between A fast breeder reactor shielding plug characterized by being set to 1/4 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56065013A JPS57179695A (en) | 1981-04-28 | 1981-04-28 | Shielding plug of fast breeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56065013A JPS57179695A (en) | 1981-04-28 | 1981-04-28 | Shielding plug of fast breeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57179695A JPS57179695A (en) | 1982-11-05 |
| JPS6331078B2 true JPS6331078B2 (en) | 1988-06-22 |
Family
ID=13274665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56065013A Granted JPS57179695A (en) | 1981-04-28 | 1981-04-28 | Shielding plug of fast breeder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57179695A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0266585U (en) * | 1988-11-10 | 1990-05-18 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5987697U (en) * | 1982-12-06 | 1984-06-13 | バブコツク日立株式会社 | Insulated standpipe of high temperature gas furnace |
| JP2008122248A (en) * | 2006-11-13 | 2008-05-29 | Toshiba Corp | Fast reactor |
-
1981
- 1981-04-28 JP JP56065013A patent/JPS57179695A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0266585U (en) * | 1988-11-10 | 1990-05-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57179695A (en) | 1982-11-05 |
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