JPS6223837B2 - - Google Patents

Info

Publication number
JPS6223837B2
JPS6223837B2 JP55040359A JP4035980A JPS6223837B2 JP S6223837 B2 JPS6223837 B2 JP S6223837B2 JP 55040359 A JP55040359 A JP 55040359A JP 4035980 A JP4035980 A JP 4035980A JP S6223837 B2 JPS6223837 B2 JP S6223837B2
Authority
JP
Japan
Prior art keywords
vent pipe
relief vent
steam
pool water
relief
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
Application number
JP55040359A
Other languages
Japanese (ja)
Other versions
JPS56137274A (en
Inventor
Shozo Yamanari
Kenji Tominaga
Koichi Kotani
Iwao Yokoyama
Masashi Kugenuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4035980A priority Critical patent/JPS56137274A/en
Publication of JPS56137274A publication Critical patent/JPS56137274A/en
Publication of JPS6223837B2 publication Critical patent/JPS6223837B2/ja
Granted legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

Landscapes

  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Description

【発明の詳細な説明】 本発明は、リリーフベント管に係り、特に沸騰
水型原子炉の圧力抑制型格納容器に適用するのに
好適なリリーフベント管に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a relief vent pipe, and particularly to a relief vent pipe suitable for application to a pressure suppression type containment vessel of a boiling water nuclear reactor.

第1図は、従来の沸騰水型原子炉の格納容器の
概略を示している。格納容器は、原子炉圧力容器
1を内蔵するドライウエル2と、ドーナツ型の圧
力抑制室(以下、トーラスという)3と、これら
を結ぶベント系とからなり、トーラスの下部には
プール水4が充填されている。
FIG. 1 schematically shows a containment vessel of a conventional boiling water reactor. The containment vessel consists of a dry well 2 containing a reactor pressure vessel 1, a doughnut-shaped pressure suppression chamber (hereinafter referred to as a torus) 3, and a vent system connecting these.The bottom of the torus is filled with pool water 4. Filled.

ベント系は、第2図に示す如くベント管5及び
リリーフベント管6からなり、これらのベント管
5及びリリーフベント管6の下部はプール水4中
に浸漬している。ベント管5は、原子炉配管の破
断を仮想した冷却材喪失事故時に原子炉圧力容器
1からドライウエル2内に放出された蒸気をプー
ル水4中に導き、凝縮させる機能を有している。
リリーフベント管6は、リリーフ弁が開いた時、
原子炉圧力容器1内の蒸気をプール水4中に導い
て凝縮させる機能を有している。リリーフ弁開放
時には原子炉圧力容器1から放出される高温高圧
の蒸気がリリーフベント管6を通してプール水4
内に導かれるまでの間、リリーフベント管6から
放出される非凝縮性ガスの気泡の、膨張及び圧縮
が繰り返され、トーラス壁及び内部構造材に過渡
的に加わる大きな荷重(気泡圧力脈動)が作用す
る。さらに、蒸気がリリーフベント管6よりプー
ル水4中に放出される期間に、リリーフベント管
6の出口において長期間にわたり蒸気凝縮振動が
発生する。これらに起因して、リリーフベント管
6及びプール水4中のトーラス3の構造物に繰返
し荷重が加わる。
The vent system consists of a vent pipe 5 and a relief vent pipe 6, as shown in FIG. 2, and the lower portions of these vent pipes 5 and relief vent pipe 6 are immersed in the pool water 4. The vent pipe 5 has the function of guiding steam released into the dry well 2 from the reactor pressure vessel 1 into the pool water 4 and condensing it in the event of a loss of coolant accident hypothetically rupturing a reactor piping.
When the relief valve opens, the relief vent pipe 6
It has a function of guiding the steam in the reactor pressure vessel 1 into the pool water 4 and condensing it. When the relief valve is opened, high-temperature, high-pressure steam released from the reactor pressure vessel 1 passes through the relief vent pipe 6 to pool water 4.
Until the non-condensable gas bubbles are released from the relief vent pipe 6, they are repeatedly expanded and compressed, and a large load (bubble pressure pulsation) is transiently applied to the torus wall and internal structural materials. act. Furthermore, during the period when steam is released from the relief vent pipe 6 into the pool water 4, steam condensation vibrations occur for a long period of time at the outlet of the relief vent pipe 6. Due to these, repeated loads are applied to the structure of the relief vent pipe 6 and the torus 3 in the pool water 4.

本発明の目的は、蒸気凝縮振動により圧力抑制
室に加わる荷重を低減できると共に蒸気凝縮作用
を向上できるリリーフベント管を提供することに
ある。
An object of the present invention is to provide a relief vent pipe that can reduce the load applied to the pressure suppression chamber due to steam condensation vibrations and improve the steam condensation effect.

本発明の特徴は、リリーフベント管の底部が密
封され、リリーフベント管の軸方向に伸びるスリ
ツト状の複数の第1放出孔をリリーフベント管の
側面に設置し、第1放出孔よりも開口面積の小さ
な第2放出孔をリリーフベント管の底部に設けた
ことにある。
The present invention is characterized in that the bottom of the relief vent pipe is sealed, a plurality of slit-shaped first discharge holes extending in the axial direction of the relief vent pipe are installed on the side of the relief vent pipe, and the opening area is larger than that of the first discharge holes. A small second discharge hole is provided at the bottom of the relief vent pipe.

本発明の好適な一実施例であるリリーフベント
管を第3図にて説明する。これは、トーラス3内
のプール水4中に挿入されたリリーフベント管の
出口を示している。リリーフベント管6は、プー
ル水4中に浸漬されている部分の側面に軸方向に
伸びる複数のスリツト孔9を有している。リリー
フベント管6の底部8は、密封されて複数の底部
孔10を有している。スリツト孔9及び底部孔1
0は、蒸気放出孔である。一つの底部孔10の開
口面積は、一つのスリツト孔9のそれよりも小さ
い。全底部孔10の全開口面積は、全スリツト孔
9の全開口面積よりも小さい。
A relief vent pipe which is a preferred embodiment of the present invention will be explained with reference to FIG. This shows the outlet of the relief vent pipe inserted into the pool water 4 within the torus 3. The relief vent pipe 6 has a plurality of slit holes 9 extending in the axial direction on the side surface of the portion immersed in the pool water 4. The bottom 8 of the relief vent tube 6 is sealed and has a plurality of bottom holes 10. Slit hole 9 and bottom hole 1
0 is a steam release hole. The opening area of one bottom hole 10 is smaller than that of one slit hole 9. The total opening area of all the bottom holes 10 is smaller than the total opening area of all the slit holes 9.

このような本実施例によれば、以下のような理
由によつて蒸気凝縮振動を従来に比べて大幅に低
減することができる。
According to this embodiment, the steam condensation vibration can be significantly reduced compared to the conventional method for the following reasons.

(1) 複数のスリツト孔9から蒸気を逃すことがで
きるので、蒸気凝縮振動の振幅を小さくできる
と共に蒸気の凝縮に時間遅れを生じさせること
ができ、全体では常に一定の蒸気凝縮が生じて
いる状態になる。
(1) Since steam can escape from the plurality of slit holes 9, the amplitude of the steam condensation vibration can be reduced and a time delay can be caused in the steam condensation, so that a constant steam condensation is always occurring overall. become a state.

(2) 同じ流路面積でも複数のスリツト孔9を有し
ているので、抵抗計数が大きくなつてリリーフ
ベント管6内の圧力が低下し、プール水がリリ
ーフベント管6内に流入する速度が小さくな
る。
(2) Since there are multiple slit holes 9 even though the flow path area is the same, the resistance coefficient increases, the pressure inside the relief vent pipe 6 decreases, and the speed at which pool water flows into the relief vent pipe 6 decreases. becomes smaller.

(3) スリツト孔9が軸方向に伸びているので、ス
リツト孔9の上端部はプール水面近くに位置
し、水深部7の長さが短くなる。従つて小さな
蒸気圧で蒸気がリリーフベント管6からベント
クリヤされ、蒸気凝縮振動が低減される。
(3) Since the slit hole 9 extends in the axial direction, the upper end of the slit hole 9 is located near the pool water surface, and the length of the water depth section 7 is shortened. Therefore, the steam is vented from the relief vent pipe 6 with a small steam pressure, and the steam condensation vibration is reduced.

本実施例によれば、上記(3)項のサブマージエン
スの効果だけで蒸気凝縮振動荷重は従来の約1/20
に低減する。
According to this embodiment, the steam condensation vibration load can be reduced to about 1/20 of the conventional one due to the submergence effect described in item (3) above.
Reduce to

さらに本実施例は、開口面積の小さな底部孔1
0を有しているので、底部孔10から放出される
少量の蒸気によりトーラス3底部付近のプール水
4の撹拌効果が向上し、プール水4の温度がトー
ラス3内で均一化されプール水4による蒸気の凝
縮作用が向上する。底部孔10を設けない場合に
は、リリーフベント管6の下端より下方のプール
水の撹拌が行われず、リリーフベント管6の下端
より下方と上方においてプール水温に差が生じ
る。本実施例においては、前述のようにプール水
4の温度がトーラス3内で均一化される。なお、
底部孔10から放出される蒸気の圧力はスリツト
孔9の影響により著しく低下しているので、底部
孔10から放出される蒸気によつてトーラス3の
底面に加えられる衝撃力は著しく小さい。
Furthermore, this embodiment has a bottom hole 1 with a small opening area.
0, the small amount of steam released from the bottom hole 10 improves the stirring effect of the pool water 4 near the bottom of the torus 3, and the temperature of the pool water 4 is made uniform within the torus 3. This improves the steam condensation effect. If the bottom hole 10 is not provided, the pool water below the lower end of the relief vent pipe 6 will not be stirred, and a difference will occur in the pool water temperature below and above the lower end of the relief vent pipe 6. In this embodiment, the temperature of the pool water 4 is made uniform within the torus 3 as described above. In addition,
Since the pressure of the steam discharged from the bottom hole 10 is significantly reduced by the influence of the slit hole 9, the impact force applied to the bottom surface of the torus 3 by the steam discharged from the bottom hole 10 is extremely small.

なお、スリツト孔9の軸方向の位置を互いにず
らせてもよい。
Note that the axial positions of the slit holes 9 may be shifted from each other.

本発明によれば、蒸気凝縮振動荷重が著しく低
減され、しかも蒸気の凝縮作用が向上する。
According to the present invention, the steam condensation vibration load is significantly reduced and the steam condensation effect is improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は沸騰水型原子炉の格納容器の外観図、
第2図は従来のリリーフベント管の外観図、第3
図は本発明の一実施例であるリリーフベント管の
先端部の構造図である。 1……原子炉圧力容器、2……ドライウエル、
3……圧力抑制室、4……プール水、6……リリ
ーフベント管、8……底部、9……スリツト孔、
10……底部孔。
Figure 1 is an external view of the containment vessel of a boiling water reactor.
Figure 2 is an external view of a conventional relief vent pipe, Figure 3
The figure is a structural diagram of the tip of a relief vent pipe according to an embodiment of the present invention. 1...Reactor pressure vessel, 2...Dry well,
3... Pressure suppression chamber, 4... Pool water, 6... Relief vent pipe, 8... Bottom, 9... Slit hole,
10...Bottom hole.

Claims (1)

【特許請求の範囲】[Claims] 1 原子炉過渡変化時に原子炉容器内の蒸気を圧
力抑制室内の冷却材中に導き凝縮させるリリーフ
ベント管において、前記リリーフベント管の底部
が密封され、リリーフベント管の軸方向に伸びる
スリツト状の複数の第1放出孔を前記リリーフベ
ント管の側面に設置し、前記第1放出孔よりも開
口面積の小さな第2放出孔を前記リリーフベント
管の底部に設けたことを特徴とするリリーフベン
ト管。
1. In a relief vent pipe that guides and condenses the steam in the reactor vessel into the coolant in the pressure suppression chamber during reactor transients, the bottom of the relief vent pipe is sealed and a slit-shaped part extending in the axial direction of the relief vent pipe is provided. A relief vent pipe, characterized in that a plurality of first discharge holes are installed on the side surface of the relief vent pipe, and a second discharge hole having a smaller opening area than the first discharge holes is provided at the bottom of the relief vent pipe. .
JP4035980A 1980-03-31 1980-03-31 Releaf bent tube Granted JPS56137274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4035980A JPS56137274A (en) 1980-03-31 1980-03-31 Releaf bent tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4035980A JPS56137274A (en) 1980-03-31 1980-03-31 Releaf bent tube

Publications (2)

Publication Number Publication Date
JPS56137274A JPS56137274A (en) 1981-10-27
JPS6223837B2 true JPS6223837B2 (en) 1987-05-25

Family

ID=12578437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4035980A Granted JPS56137274A (en) 1980-03-31 1980-03-31 Releaf bent tube

Country Status (1)

Country Link
JP (1) JPS56137274A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56176484U (en) * 1980-05-31 1981-12-26

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52127586A (en) * 1976-04-15 1977-10-26 Kraftwerk Union Ag Concenser tube for overpressure limiting discharger of atomic power plant

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52127586A (en) * 1976-04-15 1977-10-26 Kraftwerk Union Ag Concenser tube for overpressure limiting discharger of atomic power plant

Also Published As

Publication number Publication date
JPS56137274A (en) 1981-10-27

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