JPH0634066B2 - Negative pressure maintaining device in pedestal of reactor pressure vessel - Google Patents
Negative pressure maintaining device in pedestal of reactor pressure vesselInfo
- Publication number
- JPH0634066B2 JPH0634066B2 JP63247399A JP24739988A JPH0634066B2 JP H0634066 B2 JPH0634066 B2 JP H0634066B2 JP 63247399 A JP63247399 A JP 63247399A JP 24739988 A JP24739988 A JP 24739988A JP H0634066 B2 JPH0634066 B2 JP H0634066B2
- Authority
- JP
- Japan
- Prior art keywords
- pedestal
- negative pressure
- duct
- maintaining device
- local exhaust
- 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 - Lifetime
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
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
- Ventilation (AREA)
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は原子力発電所の原子炉格納容器内（以下、ＰＣ
Ｖと記す）に格納される原子炉圧力容器（以下、ＲＰＶ
と記す）を設置するためのペデスタル内の負圧維持装置
に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a reactor containment vessel of a nuclear power plant (hereinafter, PC).
Reactor pressure vessel (hereinafter RPV) stored in V
The negative pressure maintaining device in the pedestal for installing the
（従来の技術） 沸騰水型原子力発電所の原子炉建屋内には第２図に示し
たようにコンクリート製建屋１の中央部にＲＰＶ２がペ
デスタル３上に載置固定されており、ＰＲＶ２およびペ
デスタル３を包囲してＰＣＶ４が設けられている。ＰＣ
Ｖ４内は隔壁５を境にして上部にドライウェル６，下部
にサプレッションチェンバ７が形成されている。ペデス
タル３はベースマット８から立設し、制御棒駆動機構
（以下、ＣＲＤと記す）運搬用開口９が形成されてい
る。ペデスタル３内は定期点検時に制御棒を引き抜いた
り、その他制御棒などを搬出入するためのスペースとし
て利用される。ペデスタル３内の汚染拡大を防止した
り、また換気したりするために局所排気装置10が設置さ
れている。この局所排気装置10は開口９からＰＣＶ４外
まで布設された仮設ダクト11と、この仮設ダクト11の端
末に接続されたブロワ12とからなっている。ブロワ12を
作動させることによって定期点検時にペデスタル３内は
負圧に維持され、また換気されてペデスタル３内の環境
が良好に維持される。また、ＰＣＶ４内のドライウェル
６には複数台のローカルクーラー13，13a が設置され、
このうちのローカルクーラー13a は本設ダクト14を介し
てペデスタル３に接続されている。このローカルクーラ
ー13a は原子炉の通常運転時にペデスタル３内に換気し
ている。(Prior Art) In a reactor building of a boiling water nuclear power plant, as shown in FIG. 2, an RPV 2 is placed and fixed on a pedestal 3 in a central part of a concrete building 1, and a PRV 2 and a pedestal are fixed. A PCV 4 is provided so as to surround 3. PC
Inside the V4, a dry well 6 is formed on the upper side of the partition wall 5 as a boundary, and a suppression chamber 7 is formed on the lower side. The pedestal 3 is erected from the base mat 8 and has an opening 9 for carrying a control rod drive mechanism (hereinafter, referred to as CRD). The inside of the pedestal 3 is used as a space for pulling out the control rods and carrying in and out other control rods at the time of regular inspection. A local exhaust system 10 is installed in order to prevent the spread of pollution in the pedestal 3 and to ventilate it. The local exhaust device 10 is composed of a temporary duct 11 extending from the opening 9 to the outside of the PCV 4, and a blower 12 connected to the end of the temporary duct 11. By operating the blower 12, the inside of the pedestal 3 is maintained at a negative pressure at the time of periodic inspection, and is ventilated to maintain the environment inside the pedestal 3 in a good condition. Also, a plurality of local coolers 13 and 13a are installed in the dry well 6 in the PCV 4,
Of these, the local cooler 13a is connected to the pedestal 3 via the main duct 14. This local cooler 13a ventilates the pedestal 3 during normal operation of the reactor.
（発明が解決しようとする課題） 従来のＰＲＶペデスタル３内の負圧維持装置は仮設ダク
ト11をＣＲＤ運搬用開口９に引き込んでブロワ12によっ
て吸引するものであるが、ＣＲＤ運搬用開口９は本来、
制御棒の搬出入を目的としたものであり、また同時に作
業員の出入りなどにも利用している。しかしながら、Ｃ
ＲＤ運搬用開口９に仮設ダクト11を引き込むと、本来の
目的とする作業性を仮設ダクト11によって阻害してしま
うことになる。この対策として、常設の局所排気装置を
装置することも考えられるが、ＰＣＶ４内およびペデス
タル３内のスペースの関係から設置が困難なのである。
また、定期点検に際して行う制御棒の搬出入作業時の換
気は作業員にも容易に行うことができる単純な構成の負
圧維持装置が要求される。(Problems to be Solved by the Invention) The conventional negative pressure maintaining device in the PRV pedestal 3 draws the temporary duct 11 into the CRD transport opening 9 and sucks it by the blower 12. However, the CRD transport opening 9 is originally ,
The purpose is to carry in and out the control rods, and at the same time, it is used for the entry and exit of workers. However, C
If the temporary duct 11 is drawn into the RD transport opening 9, the temporary duct 11 will hinder the original workability. As a countermeasure against this, it is possible to install a permanent local exhaust system, but it is difficult to install because of the space in the PCV 4 and the space in the pedestal 3.
Further, a negative pressure maintaining device having a simple structure is required so that even a worker can easily perform ventilation when carrying out / in the control rod during the periodic inspection.
したがって、本発明は単純な操作でペデスタルを負圧に
維持でき、ドライウェルへの汚染拡大を防止し、作業性
が向上したＲＰＶペデスタル内の負圧維持装置を提供す
ることにある。Therefore, it is an object of the present invention to provide a negative pressure maintaining device in an RPV pedestal that can maintain the negative pressure of the pedestal by a simple operation, prevent the contamination of the dry well from spreading, and improve the workability.
［発明の構成］ （課題を解決するための手段） 本発明は原子炉圧力容器を設置するペデスタル内に接続
された本設ダクトに閉止用ダンパを設けるとともに、こ
の閉止用ダンパとペデスタルとの間に分岐して接続ノズ
ルを設け、この接続ノズルに局所排気ダクトおよび局所
排気ファンを設けてなることを特徴とする。[Structure of the Invention] (Means for Solving the Problems) The present invention provides a main assembly duct connected to the inside of a pedestal in which a reactor pressure vessel is installed, with a closing damper, and between the closing damper and the pedestal. And a connection nozzle is provided, and a local exhaust duct and a local exhaust fan are provided in the connection nozzle.
（作 用） 定期点検時に本設ダクトに設けた閉止用ダンパを閉じ
て、接続ノズルに局所排気ダクトを接続したのち、局所
排気ファンを作動しペデスタル内を強制排気して負圧を
維持する。ペデスタル内への給気はＣＲＤ運搬用開口９
を通しドライウェル内の空気を自然流入させる。ファン
の吸引力と自然流入による空気圧によってドライウェル
内を所定の圧力に維持することができる。(Operation) Close the damper for closing installed in the main duct during regular inspection, connect the local exhaust duct to the connecting nozzle, and then operate the local exhaust fan to forcibly exhaust the inside of the pedestal to maintain negative pressure. Air supply into the pedestal is through the CRD transport opening 9
The air in the dry well is allowed to flow in through. The inside of the dry well can be maintained at a predetermined pressure by the suction force of the fan and the air pressure caused by natural inflow.
（実施例） 第１図を参照しながら本発明に係るＲＰＶペデスタル内
の負圧維持装置の一実施例を説明する。(Embodiment) An embodiment of the negative pressure maintaining device in the RPV pedestal according to the present invention will be described with reference to FIG.
第１図は本発明の要部のみを示してあり、第２図と同一
部分には同一符号を示し、重複する部分の説明を省略す
る。FIG. 1 shows only the essential parts of the present invention, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description of the overlapping parts will be omitted.
第１図において、ＰＲＶ２を載置し、固定するペデスタ
ル３のＣＲＤ運搬用開口９の上部壁を貫通して設置され
た本設ダクト14に閉止用ダンパ15を設けるとともに、こ
の閉止用ダンパ15とペデスタル３との間から分岐して接
続ノズル16を設けている。この接続ノズル16には局所排
気ダクト17の一端が接続され、この局所排気ダクト17の
他端はＰＣＶ４を貫通してＰＣＶ４外に設置されたフィ
ルタ18の入口側に接続されている。フィルタ18の出口側
には局所排気ファン19が接続されている。局所排気ファ
ン19の出口側は導管20が接続され、導管20は継手21を介
して建屋内排気ダクト22に接続されている。As shown in FIG. 1, a closing damper 15 is provided in the main duct 14 installed through the upper wall of the CRD transport opening 9 of the pedestal 3 on which the PRV 2 is mounted and fixed. A connection nozzle 16 is provided by branching from the pedestal 3. One end of a local exhaust duct 17 is connected to the connecting nozzle 16, and the other end of the local exhaust duct 17 penetrates the PCV 4 and is connected to an inlet side of a filter 18 installed outside the PCV 4. A local exhaust fan 19 is connected to the outlet side of the filter 18. A conduit 20 is connected to the outlet side of the local exhaust fan 19, and the conduit 20 is connected to a building exhaust duct 22 via a joint 21.
しかして、上記装置において、閉止用ダンパ15を閉じ、
局所排気ファン19を作動させると、フィルタ18，局所排
気ダクト17，接続ノズル16および本設ダクト14を通しペ
デスタル３内が排気されてペデスタル３内は減圧され
る。これに伴なってペデスタル３への給気はＣＲＤ運搬
用開口９からドライウェル内の空気がペデスタル３内に
自然流入される。このファン19の作動による減圧と自然
流入による空気圧とでペデスタル３内は所定の負圧に維
持される。この負圧維持によってドライウェル６内への
汚染拡大が防止される。Then, in the above device, the closing damper 15 is closed,
When the local exhaust fan 19 is operated, the inside of the pedestal 3 is exhausted through the filter 18, the local exhaust duct 17, the connecting nozzle 16 and the main duct 14, and the inside of the pedestal 3 is depressurized. Along with this, the air in the dry well is naturally flown into the pedestal 3 through the CRD transport opening 9 for the air supply to the pedestal 3. The inside of the pedestal 3 is maintained at a predetermined negative pressure by the pressure reduction due to the operation of the fan 19 and the air pressure due to the natural inflow. By maintaining this negative pressure, the spread of contamination in the dry well 6 is prevented.
原子炉の通常運転時には閉止用ダンパ15を開き、ローカ
ルクーラー13a を作動させ本設ダクト14からペデスタル
３内を排気し換気する。During normal operation of the nuclear reactor, the closing damper 15 is opened, the local cooler 13a is operated, and the inside of the pedestal 3 is exhausted from the main duct 14 for ventilation.
［発明の効果］ 本発明によれば仮設ダクトを使用することなく、本設ダ
クトに設けた閉止用ダンパを閉じ、局所排気ファンを作
動させることによって定期点検時のペデスタル内の負圧
を維持することが容易にでき、かつドライウェル内への
汚染拡大を防止することができる。[Effects of the Invention] According to the present invention, without using a temporary duct, the closing damper provided in the main duct is closed and the local exhaust fan is operated to maintain the negative pressure in the pedestal at the time of regular inspection. This makes it possible to prevent the contamination from spreading into the dry well.
また、局所排気ファンの作動をペデスタルの外部から簡
単な操作で行うことができるため作業性の向上とともに
作業員の放射線被曝の低減を図ることができる。Further, since the operation of the local exhaust fan can be performed from the outside of the pedestal by a simple operation, it is possible to improve workability and reduce radiation exposure of workers.
第１図は本発明に係るペデスタル内の負圧維持装置の一
実施例を模式的に示す構成図、第２図は従来例を説明す
るための原子力発電所の建屋内を概略的に示す縦断面図
である。 １……建屋 ２……ＲＰＶ ３……ペデスタル ４……ＰＣＶ ５……隔壁 ６……ドライウェル ７……サプレッションチェンバー ８……ベースマット ９……ＣＲＤ運搬用開口 10……局所排気装置 11……仮設ダクト 12……ブロワ 13……ローカルクーラー 14……本設ダクト 15……閉止用ダンパ 16……接続ノズル 17……局所排気ダクト 18……フィルタ 19……局所排気ファン 20……導管 21……継手 22……建屋内排気ダクトFIG. 1 is a configuration diagram schematically showing an embodiment of a negative pressure maintaining device in a pedestal according to the present invention, and FIG. 2 is a vertical section schematically showing a building of a nuclear power plant for explaining a conventional example. It is a side view. 1 ... Building 2 ... RPV 3 ... Pedestal 4 ... PCV 5 ... Partition 6 ... Drywell 7 ... Suppression chamber 8 ... Base mat 9 ... CRD transport opening 10 ... Local exhaust system 11 ... … Temporary duct 12 …… Blower 13 …… Local cooler 14 …… Main duct 15 …… Closing damper 16 …… Connection nozzle 17 …… Local exhaust duct 18 …… Filter 19 …… Local exhaust fan 20 …… Conduit 21 …… Joint 22 …… Exhaust duct in the building
Claims (1)
接続された本設ダクトに閉止用ダンパを設けるととも
に、この閉止用ダンパとペデスタルとの間に分岐して接
続ノズルを設け、この接続ノズルに局所排気ダクトおよ
び局所排気ファンを設けてなることを特徴とする原子炉
圧力容器ペデスタル内の負圧維持装置。1. A closing duct is provided in a main duct connected to a pedestal in which a reactor pressure vessel is installed, and a connecting nozzle is provided so as to branch between the closing damper and the pedestal. A negative pressure maintaining device in a pedestal of a reactor pressure vessel, characterized in that a local exhaust duct and a local exhaust fan are provided in the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63247399A JPH0634066B2 (en) | 1988-10-03 | 1988-10-03 | Negative pressure maintaining device in pedestal of reactor pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63247399A JPH0634066B2 (en) | 1988-10-03 | 1988-10-03 | Negative pressure maintaining device in pedestal of reactor pressure vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0296690A JPH0296690A (en) | 1990-04-09 |
| JPH0634066B2 true JPH0634066B2 (en) | 1994-05-02 |
Family
ID=17162852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63247399A Expired - Lifetime JPH0634066B2 (en) | 1988-10-03 | 1988-10-03 | Negative pressure maintaining device in pedestal of reactor pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0634066B2 (en) |
-
1988
- 1988-10-03 JP JP63247399A patent/JPH0634066B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0296690A (en) | 1990-04-09 |
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