JPH0131994Y2 - - Google Patents
Info
- Publication number
- JPH0131994Y2 JPH0131994Y2 JP1982081172U JP8117282U JPH0131994Y2 JP H0131994 Y2 JPH0131994 Y2 JP H0131994Y2 JP 1982081172 U JP1982081172 U JP 1982081172U JP 8117282 U JP8117282 U JP 8117282U JP H0131994 Y2 JPH0131994 Y2 JP H0131994Y2
- Authority
- JP
- Japan
- Prior art keywords
- control rod
- upper shield
- groove
- flow
- reactor
- 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
- 239000007788 liquid Substances 0.000 claims description 16
- 230000005855 radiation Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002574 poison Substances 0.000 description 5
- 231100000614 poison Toxicity 0.000 description 5
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005206 flow analysis Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 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
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【考案の詳細な説明】
本考案は、圧力管型原子炉で用いる制御棒の上
部遮蔽体に関し、更に詳しくは、その周壁に沿つ
て流れる流体の流動抵抗を著しく減少させうる構
造の上部遮蔽体に関するものである。[Detailed description of the invention] The present invention relates to an upper shield for a control rod used in a pressure tube nuclear reactor, and more specifically, an upper shield having a structure that can significantly reduce the flow resistance of fluid flowing along its peripheral wall. It is related to.
圧力管型原子炉では、制御棒は制御棒案内管内
にて昇降自在に吊設され、それを炉内に出し入れ
することによつて原子炉の出力調整等を行うよう
になつているが、炉心からの放射線を遮蔽するた
め、制御棒本体の上部には案内管内径よりも若干
小径の円柱ブロツク状の上部遮蔽体が取付けられ
ている。他方、制御棒は、原子炉内において放射
線によつて加熱されるため、重水を流して冷却し
ている。この場合、冷却用重水の流速は小さく、
そのため上部遮蔽体での圧力損失はさほど大きく
なかつた。 In a pressure tube reactor, the control rods are suspended in the control rod guide tube so that they can move up and down, and by moving them in and out of the reactor, the output of the reactor can be adjusted. In order to shield radiation from the control rod, a cylindrical block-shaped upper shield whose diameter is slightly smaller than the inner diameter of the guide tube is attached to the upper part of the control rod body. On the other hand, since the control rods are heated by radiation inside the reactor, they are cooled by flowing heavy water. In this case, the flow rate of heavy water for cooling is small;
Therefore, the pressure loss in the upper shield was not so large.
しかし、実証炉においては、制御棒案内管の内
部に中性子を吸収するポイズン液を高速で流入さ
せる必要が生じた。そこで流動解析を行つたとこ
ろ、従来構造の制御棒ではその上部遮蔽体の部分
が非常に大きな流動抵抗を呈し、所定量のポイズ
ン液が炉心へ到達する時間が長くなることが判明
した。上部遮蔽体と制御棒案内管とのギヤツプを
大きくすれば流動抵抗を小さくしうるが、中性子
の上部への遮蔽機能は低下してしまう。 However, in the demonstration reactor, it became necessary to flow poison liquid that absorbs neutrons into the control rod guide tube at high speed. When we conducted a flow analysis, we found that the upper shield of a control rod with a conventional structure exhibits extremely large flow resistance, and it takes a long time for a predetermined amount of poison liquid to reach the reactor core. If the gap between the upper shield and the control rod guide tube is increased, the flow resistance can be reduced, but the shielding function of neutrons to the upper part will be reduced.
本考案の目的は、このような従来技術がもつ問
題点を解決し、制御棒上部で炉内からの中性子の
遮蔽を確実に行うことができると同時に、制御棒
案内管内に液体を高速で流入させる際の流動低抗
を低減しうるような構造の制御棒上部遮蔽体を提
供することにある。 The purpose of this invention is to solve these problems with the conventional technology, and to be able to reliably shield neutrons from inside the reactor at the upper part of the control rod, while at the same time allowing liquid to flow into the control rod guide tube at high speed. An object of the present invention is to provide a control rod upper shield having a structure capable of reducing flow resistance when the control rod is moved.
以下、図面に基づき本考案について説明する。
第１図は本考案に係る上部遮蔽体を用いた制御棒
の説明図であり、第２図はその−断面図であ
る。従来同様、制御棒１０はワイヤーロープによ
り制御棒案内管１２の内部に吊設され、該制御棒
１０を出入させることによつて原子炉の出力調整
等を行えるようになつている。制御棒１０は、制
御棒本体１４、上部遮蔽体１６、吊り金具１８等
を備えている。上部遮蔽体１６は、制御棒本体１
４の上方に位置し、炉心からの放射線を遮蔽する
機能を果すもので、円柱ブロツク状をなしてい
る。これに対し、制御棒本体１４は中性子吸収断
面積の大きい材料で作られた中空円筒状の長尺構
造体である。制御棒１０は、炉内において放射線
によつて加熱されるため、制御棒案内管１２内に
給水することによつて冷却が行われる。この冷却
水は、制御棒１０の外周と制御棒案内管１２との
間隙部を流下するばかりでなく、内部冷却用小孔
１９を通つて制御棒本体１４の内部にも流入し、
それを内側からも冷却する。なお、符号２０は、
制御棒のガイドローラである。 The present invention will be explained below based on the drawings.
FIG. 1 is an explanatory view of a control rod using an upper shield according to the present invention, and FIG. 2 is a sectional view thereof. As in the past, the control rods 10 are suspended inside a control rod guide tube 12 by wire ropes, and by moving the control rods 10 in and out, the output of the reactor can be adjusted. The control rod 10 includes a control rod main body 14, an upper shield 16, a hanging fitting 18, and the like. The upper shield 16 is connected to the control rod body 1
It is located above the reactor core and functions to shield radiation from the reactor core, and has a cylindrical block shape. On the other hand, the control rod body 14 is a hollow cylindrical elongated structure made of a material with a large neutron absorption cross section. Since the control rods 10 are heated by radiation in the reactor, they are cooled by supplying water into the control rod guide tubes 12. This cooling water not only flows down the gap between the outer periphery of the control rod 10 and the control rod guide tube 12, but also flows into the inside of the control rod body 14 through the internal cooling small hole 19.
It also cools it from the inside. In addition, the code 20 is
This is a guide roller for the control rod.
さて、本考案では、このような上部遮蔽体１６
は、その外周面に、溝を有するものである。この
溝の形状は、液体の下方向への流通を許すが中性
子の上方向への通過は阻止し、かつ液体の流通に
よつて制御棒に回転力を発生させない形状とされ
る。本実施例では、溝２２は、２本の互いに逆向
きのスパイラル溝である。このような構造とする
と、制御棒１０と制御棒案内管１２との間に高速
でポイズン液を流す場合、該ポイズン液は溝２２
を通つて流下するため、流動抵抗が小さくなるの
である。つまり、本実施例によれば、放射線は直
進するためスパラル溝によつて遮蔽され、これに
対し、液体はスパイラル溝に沿つて流れるため容
易に流入できるし、また高速で液体が流下して
も、２本のスパイラル溝に沿つて流れる液体は制
御棒１０に対し互いに逆向きの回転力を付与する
ため、これらが打消し合い、結局、制御棒１０に
は回転力は生じない。一般に、二重管で構成され
る流路の流動抵抗に対する等価な直径は、外管内
径Ｄ１と内柱外径Ｄ２の差Ｄ１−Ｄ２で表わされ
る。本考案の場合は、遮蔽効果を高めるためＤ１
−Ｄ２は非常に小さい値に選定されるから、スパ
イラル溝による流路は非常に大きな意味をもつこ
とになる。 Now, in the present invention, such an upper shield 16
has a groove on its outer peripheral surface. The shape of this groove is such that it allows the liquid to flow downward, but prevents neutrons from passing upward, and does not generate rotational force on the control rod due to the liquid flow. In this embodiment, the grooves 22 are two spiral grooves in opposite directions. With this structure, when flowing poison liquid at high speed between the control rod 10 and the control rod guide tube 12, the poison liquid flows through the groove 22.
Since the water flows down through the , the flow resistance becomes smaller. In other words, according to this embodiment, since the radiation travels straight, it is shielded by the spiral grooves, whereas the liquid flows along the spiral grooves, so it can easily flow in, and even if the liquid flows down at high speed, Since the liquid flowing along the two spiral grooves applies rotational forces in opposite directions to the control rod 10, these forces cancel each other out, and as a result, no rotational force is generated on the control rod 10. Generally, the equivalent diameter for the flow resistance of a flow path composed of a double tube is represented by the difference D1-D2 between the inner diameter D1 of the outer tube and the outer diameter D2 of the inner column. In the case of this invention, D1 is used to enhance the shielding effect.
Since -D2 is selected to be a very small value, the flow path formed by the spiral groove has a very large significance.
因に、制御棒案内管１２の内径を83mmφ、上部
遮蔽体１６の外径を74mmφとしたときの流動抵抗
は、スパイラル溝の流路断面積によつてほぼ第３
図に示すように変化する。なお、同図において、
縦軸の流動抵抗比と横軸のスパイラル等価直径の
定義は次の通りである。 Incidentally, when the inner diameter of the control rod guide tube 12 is 83 mmφ and the outer diameter of the upper shield 16 is 74 mmφ, the flow resistance is approximately 3 mm due to the cross-sectional area of the spiral groove.
Changes as shown in the figure. In addition, in the same figure,
The definitions of the flow resistance ratio on the vertical axis and the spiral equivalent diameter on the horizontal axis are as follows.
流動抵抗比
スパイラル溝のある場合の流動抵抗／スパイラル溝な
しの場合の流動抵抗
スパイラル溝等価直径
４×溝の流路断面積／２×（溝の深さ＋溝の幅）
同図から、仮に、溝の幅が20mm、深さが10mmの
スパイラル溝を設けると、スパイラル溝等価直径
は約14mmとなり、流動抵抗は溝なしの場合の約1/
３に減少させうることが判る。Flow resistance ratio Flow resistance with spiral grooves / Flow resistance without spiral grooves Equivalent diameter of spiral grooves 4 x cross-sectional area of grooves / 2 x (groove depth + groove width) From the same figure, temporarily If a spiral groove with a width of 20 mm and a depth of 10 mm is provided, the equivalent diameter of the spiral groove will be approximately 14 mm, and the flow resistance will be approximately 1/1 of that without a groove.
It turns out that it can be reduced to 3.
以上、本考案の一実施例について詳述したが、
前述した三つの条件、すなわち液体の下方向への
流通を許すこと、中性子の上方向への通過は阻止
すること、液体の流通によつて制御棒に回転力を
与えないこと、を満たすならば如可なる溝形状で
もよい。その様々なバリエーシヨンを第４図に示
す。第４図の各図は溝の形状を明瞭に示すための
上部遮蔽体の展開図である。同図Ａは第１図で示
したダブルスパイラル型の場合、Ｂは平行コサイ
ン曲線型、Ｃは平行サイン曲線型、Ｄは対称コサ
イン曲線型、Ｅは対称サイン曲線型、Ｆは対称Ｓ
字型、Ｇは対称曲線型、ＨはＷ字型、Ｉは半円
型、Ｊは放物線型である。これらのいずれの場合
も前記三つの条件を満たすことは充分理解しうる
であろう。溝の断面形状は任意である。 Above, one embodiment of the present invention has been described in detail.
If the three conditions mentioned above are met: allowing the liquid to flow downward, blocking the upward passage of neutrons, and not applying any rotational force to the control rods due to the liquid flowing. Any groove shape may be used. Its various variations are shown in FIG. Each figure in FIG. 4 is a developed view of the upper shield to clearly show the shape of the groove. In the same figure, A is the double spiral type shown in Figure 1, B is a parallel cosine curve type, C is a parallel sine curve type, D is a symmetric cosine curve type, E is a symmetric sine curve type, and F is a symmetric S
G is a symmetrical curve shape, H is a W shape, I is a semicircular shape, and J is a parabolic shape. It can be fully understood that the above three conditions are satisfied in any of these cases. The cross-sectional shape of the groove is arbitrary.
本考案は上記のように構成されているため、制
御棒上部で炉内からの中性子の遮蔽を確実に行う
ことができると同時に、制御棒案内管内に液体を
高速で流入される際の流動抵抗を低減させること
ができ、それ故、万一の事故時に中性子を吸収す
るポイズン液を急速に注入することが可能となつ
たもので、実用的効果は極めて大である。 Since the present invention is configured as described above, it is possible to reliably shield neutrons from inside the reactor at the upper part of the control rod, and at the same time, it is possible to resist flow resistance when liquid is flowed into the control rod guide tube at high speed. This makes it possible to rapidly inject poison liquid that absorbs neutrons in the event of an accident, which has an extremely large practical effect.
第１図は本考案の一実施例を示す説明図、第２
図はその−断面図、第３図はスパイラル溝に
よる流動抵抗減少効果を示す説明図、第４図は溝
形状の様々なバリエーシヨンを示す展開図であ
る。
１０……制御棒、１２……制御棒案内管、１４
……制御棒本体、１６……上部遮蔽体。
Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
The figure is a sectional view thereof, FIG. 3 is an explanatory diagram showing the effect of reducing flow resistance by the spiral groove, and FIG. 4 is a developed view showing various variations of the groove shape. 10... Control rod, 12... Control rod guide tube, 14
... Control rod body, 16 ... Upper shield.
Claims (1)
し、炉心からの放射線を遮蔽するための円柱状
の上部遮蔽体において、その外周表面に、液体
の下方向への流通を許すが中性子の上方向への
通過は阻止し、かつ液体の流通によつて制御棒
に回転力を発生させない形状の溝が設けられて
いる制御棒上部遮蔽体。 ２ 外周表面に形成されている溝が複数本である
実用新案登録請求の範囲第１項記載の上部遮蔽
体。 ３ 溝の本数が２本であり、各溝が軸方向に関し
対称的に設けられている実用新案登録請求の範
囲第２項記載の上部遮蔽体。 ４ 溝がサイン曲線又はコサイン曲線である実用
新案登録請求の範囲第３項記載の上部遮蔽体。[Claims for Utility Model Registration] 1. A cylindrical upper shield located at the upper part of a control rod body for a pressure tube reactor to shield radiation from the reactor core. A control rod upper shield that is provided with a groove that allows liquid to flow in the direction but prevents neutrons from passing upward, and does not generate rotational force on the control rod due to liquid flow. 2. The upper shield according to claim 1, which has a plurality of grooves formed on its outer peripheral surface. 3. The upper shield according to claim 2, wherein the number of grooves is two, and each groove is provided symmetrically with respect to the axial direction. 4. The upper shield according to claim 3 of the utility model registration, wherein the groove is a sine curve or a cosine curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982081172U JPS58184695U (en) | 1982-06-01 | 1982-06-01 | Control rod upper shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982081172U JPS58184695U (en) | 1982-06-01 | 1982-06-01 | Control rod upper shield |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58184695U JPS58184695U (en) | 1983-12-08 |
| JPH0131994Y2 true JPH0131994Y2 (en) | 1989-10-02 |
Family
ID=30090293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982081172U Granted JPS58184695U (en) | 1982-06-01 | 1982-06-01 | Control rod upper shield |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58184695U (en) |
-
1982
- 1982-06-01 JP JP1982081172U patent/JPS58184695U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58184695U (en) | 1983-12-08 |
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