JP3910287B2

JP3910287B2 - System piping chemical decontamination apparatus and its chemical decontamination method

Info

Publication number: JP3910287B2
Application number: JP03152698A
Authority: JP
Inventors: 重弘岡; 伸英栗林
Original assignee: Toshiba Corp; Toshiba Plant Systems and Services Corp
Current assignee: Toshiba Corp; Toshiba Plant Systems and Services Corp
Priority date: 1998-02-13
Filing date: 1998-02-13
Publication date: 2007-04-25
Anticipated expiration: 2018-02-13
Also published as: JPH11229166A

Description

【０００１】
【発明の属する技術分野】
本発明は取外し等が困難な系統を構成する配管を設置されている状態のままの状態で除染する系統配管の化学除染装置およびその化学除染方法に関する。
【０００２】
【従来の技術】
除染対象とする系統配管を機器等から取外さないで化学除染する場合は、その系統配管に除染液を流して循環させる循環ループを接続し、その系統配管に除染液を循環して化学除染を行うのが一般的である。
【０００３】
従来の循環ループを構成した系統配管の化学除染方法を図４により説明する。図４において、符号１は除染液を収納するタンク、このタンクに接続する循環ポンプ等の機器配管で構成される化学除染装置本体で、この化学除染装置本体１はタンク（図示せず）の入口側と出口側にそれぞれ循環配管２が接続し、これらの循環配管２は除染対象配管４に取合フランジ３を介して接続されている。
【０００４】
化学除染装置本体１と除染対象配管４との間は循環配管２を介して除染液循環ループを構成している。除染対象配管４は垂直配管４ａと水平配管４ｂとからなり、この水平配管４ｂは止め弁５で堰き止められている。
【０００５】
化学除染の方法は化学除染装置本体１から除染対象配管４の全領域に除染液６を満たして、取合フランジ３とで循環配管２を介して循環ループ構成している化学除染装置本体１で、除染対象配管４を循環し化学除染を行う。
【０００６】
ところで、除染対象配管４の水平配管部にはエア溜まり７のため除染液６が満たされない箇所が生じる。化学除染終了後は、除染液を化学除染装置本体１から排出するが、除染対象配管４の水平配管４ｂ部には排出できない残留クラッド８が溜まる。また、除染液６が十分に循環できない取合フランジ３から上方の除染対象配管４は除染効果が極めて良くない。
【０００７】
【発明が解決しようとする課題】
従来の系統配管の化学除染方法は、図４から明らかなように、垂直配管４ａに設けた取合フランジ３から上方の垂直配管４ａ、とくに循環ラインの取合フランジ３から上方の遠い部分では除染効果が低下する。また、水平配管４ｂ部分には、エア溜まり７による未除染部分が発生したり、除染液を排出後には残留クラッド９が溜まるという課題がある。
【０００８】
さらに、除染を効率的に行うには、除染対象配管４内面に除染液６十分浸すことができればよいのであるが、従来の方法では、それを行うためには、除染対象配管４全体の除染液６を満たす必要がある。そのために除染液６を多量に必要とし、また非除染対象部に除染液６を浸さないためには、その境目での水位コントロールが必要である。したがって、除染液水位の制御設備と多量の除染廃液の処理に作業時間の増大と除染設備が大きくなるという課題がある。
【０００９】
本発明は、上記課題を解決するためになされたもので、除染対象配管の全領域に除染液を満たす必要がなく、除染対象配管の内面に除染液を散水できるようにして、少ない除染液で効率的に化学除染でき、しかも、水平配管部にエア溜まりを生じることがない系統配管の化学除染装置およびその化学除染方法を提供することにある。
【００１０】
【課題を解決するための手段】
請求項１の発明は、垂直配管部と水平配管部を有する除染対象配管内に化学除染装置本体から除染液を流入し循環させて化学除染する系統配管の化学除染装置において、
前記垂直配管と前記水平配管とにそれぞれ取合フランジを接続し、これらの取合フランジにそれぞれ循環配管を接続し、これらの循環配管に化学除染装置本体を接続して前記除染対象配管と前記化学除染装置本体との間を除染液が循環する化学除染液循環系統を構成するとともに、この化学除染装置本体の出口側循環配管に分岐取合を接続し、この分岐取合に散水用ポンプを接続し、この散水用ポンプの出口側に散水ホースの一端を接続し、この散水ホースの他端に前記垂直配管側の取合フランジを貫通して前記垂直配管内に挿入する洗浄ノズルを設けて前記除染対象配管内に前記洗浄ノズルを走査させて化学除染を行う化学除染系統を構成してなることを特徴とする。
【００１１】
請求項２の発明は、垂直配管と水平配管を有する除染対象配管に化学除染装置本体から化学除染液を散水する洗浄ノズルを挿入し、前記除染対象配管の一部分に前記化学除染装置本体との間で前記化学除染液の循環系統を構成して前記化学除染液を前記除染対象配管の一部分と前記化学除染装置本体との間で循環させながら、他方で前記洗浄ノズルにより前記化学除染液を散水することで前記除染対象配管の全領域を除染することことを特徴とする。
【００１２】
請求項３の発明は、前記除染対象配管と前記化学除染液循環系統を構成している除染液循環ラインに化学除染装置本体から化学除染液を放水して除染液を攪拌させる洗浄ノズルを挿入することを特徴とする。
【００１５】
【発明の実施の形態】
図１により本発明に係る系統配管の化学除染方法の第１の実施の形態を説明する。なお、図１中、図４と同一部分には同一符号を付している。
除染対象配管４は垂直配管４ａと水平配管４ｂとからなり、水平配管４ｂの端部は止め弁５で仕切られている。除染する対象部位は止め弁５から垂直配管４ａの上方までであり、化学除染装置本体１と取合う箇所は除染対象配管４の水平配管４ｂと垂直配管４ａの途中に取合フランジ３が２箇所設けられている。垂直配管４ａの取合フランジ３には別に取合３ａが設けられている。
【００１６】
化学除染装置本体１の構成機器については、図１では詳細を省略しているが、除染液収納タンク，循環ポンプ，除染剤注入機器，熱交換機，廃液処理するフィルタ・イオン交換樹脂塔や配管機器等で構成されている。
【００１７】
化学除染装置本体１の入口側および出口側にはそれぞれ循環配管２が接続し、除染対象配管４に設けた取合フランジ３で取合い、除染対象配管４と化学除染装置本体１との間には化学除染液循環ループを構成している。
【００１８】
化学除染装置本体１の除染液出口側の循環配管２に分岐取合い13が設けられ、この分岐取合い13に散水用ポンプ10がポンプ用配管９を介して接続されており、散水用ポンプ10の出口側のポンプ用配管９には散水ノズル12を取付けた散水ホース11が接続され、化学除染系統を構成している。
【００１９】
取合い３ａから除染対象配管４内部に散水ホース11とともに洗浄ノズル12を挿入し、除染対象配管４の垂直配管４ａ部位の除染範囲まで散水しながら走査（移動）し、除染する。除染中、洗浄ノズル12は散水ジェットの反力で除染対象配管４の除染範囲の境で静止して散水している。
【００２０】
取合い３ａは洗浄ノズル12と散水ホース11と化学除染装置本体１の循環配管２を通過できる貫通孔を有するフランジである。散水によるダストや飛沫が飛散するのを防止するために取合い３ａには、ビニールカバー等のカバーを取付けることができるように構成することが望ましい。このビニールカバー等の飛散防止の取り付けは一般的に通常行うことができるものなので図１では省略している。
【００２１】
除染対象配管４全体の化学除染方法は、垂直配管４ａ内部の上方の除染範囲の境まで挿入された洗浄ノズル12から除染液を散水して、上方の垂直配管４ａ内面から下方の水平配管４ｂ内面まで除染液が垂直配管４ａの内面をつたわりながら垂直配管４ａ内面を除染する（化学除染系統）。
【００２２】
除染の水位は取合い３ａから下方の▽印を付した水位であり、水位（▽印）下まで挿入された化学除染装置本体１の出口側循環配管２と除染対象配管４の水平配管４ｂ部での取合フランジ３とで接続された化学除染装置本体１の入口側循環配管２で、化学除染装置本体１と除染対象配管４の水平配管４ｂで除染液循環系統が構成されている。これにより、垂直配管４ａの下部と水平配管４ｂとの間を循環により化学除染を行うことができる。
【００２３】
本実施の形態によれば、除染対象配管４の垂直配管４ａ上方の洗浄ノズル12から配管内面をつたわって落ちてきた除染液６は、この除染液６部に流下し、前記除染液循環系統で循環され、化学除染装置本体１で処理される。このようにして除染液を除染対象配管４の垂直配管４ａまで満水にすることなく除染しようとする化学除染系統によって除染対象配管４内の全領域を少ない除染液量で化学除染することができる。
【００２４】
つぎに、図２により本発明に係る系統配管の化学除染方法の第２の実施の形態を説明する。
図２における第２の実施の形態は、除染対象配管４の水平配管４ｂ部に発生するエア溜まり７による未除染部分と残留クラッド８の除染を対象とするものである。図２中、図１と同一部分には同一符号を付して重複する部分の説明は省略する。
【００２５】
すなわち、本実施の形態は図２に示したように洗浄ノズル12を除染対象配管４の水平配管４ｂ内の止め弁５の近傍に移動して除染対象配管４内を循環している除染液６中に挿入する。そして、洗浄ノズル12を水平配管４ｂ内部の前後に移動させ走査（移動）する。
【００２６】
洗浄ノズル12の移動は、洗浄ノズル12の後方へ噴射するジェット水の反力で前方に自走し、後方へ移動する場合は、その反力より大きな力で散水ホース11を引く。洗浄ノズル12で除染液を散水しながら、散水ホース11を引いたり離したりすることで、水平配管４ｂ内面を前後に移動する。
【００２７】
本実施の形態によれば、洗浄ノズル12により除染液を放水しながら水平配管４ｂの除染液６を撹拌し、エア溜まり７で未除染部位である水平配管４ｂ上部の部位を散水し、除染液６に浸して除染を行うことができる。また、水平配管４ｂ底部に溜まっている残留クラッド８を撹拌して移動させ、化学除染装置本体１に接続している取合フランジ３の方へ排出させることができる。
【００２８】
つぎに、図３により本発明に係る系統配管の化学除染方法の第３の実施の形態を説明する。
本実施の形態は除染対象配管４の内部に除染液６を満たさないで、ほとんど気中で除染する場合の例である。すなわち、図３に示したように、洗浄ノズル12を除染対象配管４の垂直配管４ａと水平配管４ｂの内部を走査させ内面に除染液を浸すことで除染を行う。
【００２９】
本実施の形態によれば、除染後の除染対象配管４内面の水によるフラッシング方法としても有効である。その他については第１および第２の実施の形態と同様の作用効果を奏する。
【００３０】
【発明の効果】
本発明によれば、除染対象配管の全領域に除染液を満たすことなく、少ない除染液量で除染対象配管全部を除染することができ、また水平配管部位にエア溜まりによる未除染部位やクラッド溜まりを解消することができるので、効率的に系統配管の化学除染を行うことができる。
【図面の簡単な説明】
【図１】本発明に係る系統配管の化学除染装置とその化学除染方法の第１の実施の形態を説明するための配管系統図。
【図２】本発明に係る系統配管の化学除染装置とその化学除染方法の第２の実施の形態を説明するための配管系統図。
【図３】本発明に係る系統配管の化学除染装置とその化学除染方法の第３の実施の形態を説明するための配管系統図。
【図４】従来の系統配管の化学除染装置を説明するための配管系統図。
【符号の説明】
１…化学除染装置本体、２…循環配管、３…取合フランジ、３ａ…取合い、４…除染対象配管、４ａ…垂直配管、４ｂ…水平配管、５…止め弁、６…除染液、７…エア溜まり、８…残留クラッド、９…ポンプ用配管、10…散水用ポンプ、11…散水ホース、12…洗浄ノズル、13…分岐取合い。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chemical decontamination apparatus for a system pipe for decontamination in a state where pipes constituting a system that is difficult to remove are installed and a chemical decontamination method thereof.
[0002]
[Prior art]
When performing chemical decontamination without removing the system piping to be decontaminated from equipment, connect a circulation loop that circulates the decontamination solution through the system piping, and circulate the decontamination solution through the system piping. In general, chemical decontamination is performed.
[0003]
A conventional chemical decontamination method for system piping constituting a circulation loop will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a chemical decontamination apparatus body composed of a tank for storing a decontamination liquid and equipment piping such as a circulation pump connected to the tank. The chemical decontamination apparatus body 1 is a tank (not shown). ) Are respectively connected to the inlet side and the outlet side, and these circulating pipes 2 are connected to the decontamination target pipe 4 via the coupling flange 3.
[0004]
A decontamination liquid circulation loop is configured between the chemical decontamination apparatus main body 1 and the decontamination target pipe 4 via a circulation pipe 2. The decontamination target pipe 4 includes a vertical pipe 4 a and a horizontal pipe 4 b, and the horizontal pipe 4 b is blocked by a stop valve 5.
[0005]
The chemical decontamination method is a chemical decontamination method in which the entire region of the decontamination target pipe 4 is filled with the decontamination liquid 6 from the chemical decontamination apparatus main body 1, and a circulation loop is configured with the coupling flange 3 via the circulation pipe 2. In the dyeing apparatus main body 1, the decontamination target pipe 4 is circulated to perform chemical decontamination.
[0006]
By the way, a place where the decontamination liquid 6 is not filled due to the air reservoir 7 occurs in the horizontal piping portion of the decontamination target pipe 4. After the chemical decontamination is completed, the decontamination liquid is discharged from the chemical decontamination apparatus main body 1, but the residual cladding 8 that cannot be discharged accumulates in the horizontal piping 4 b portion of the decontamination target piping 4. Moreover, the decontamination effect is not very good in the decontamination target pipe 4 above the coupling flange 3 where the decontamination liquid 6 cannot be sufficiently circulated.
[0007]
[Problems to be solved by the invention]
As is apparent from FIG. 4, the conventional chemical decontamination method for the system pipe is performed in the vertical pipe 4 a above the coupling flange 3 provided in the vertical pipe 4 a, particularly in a portion far from the coupling flange 3 of the circulation line. Decontamination effect decreases. Further, there is a problem that an uncontaminated portion due to the air reservoir 7 is generated in the horizontal pipe 4b portion, or the residual clad 9 is accumulated after the decontamination liquid is discharged.
[0008]
Furthermore, in order to efficiently perform the decontamination, it is sufficient that the decontamination liquid 6 can be sufficiently immersed in the inner surface of the decontamination target pipe 4, but in the conventional method, in order to perform the decontamination target pipe 4 It is necessary to fill the entire decontamination solution 6. Therefore, a large amount of decontamination liquid 6 is required, and in order not to immerse the decontamination liquid 6 in the non-decontamination target part, it is necessary to control the water level at the boundary. Therefore, there are problems that the control equipment for the decontamination liquid water level and the treatment of a large amount of decontamination waste liquid increase the working time and increase the decontamination equipment.
[0009]
The present invention was made in order to solve the above-mentioned problems, and it is not necessary to fill the entire area of the decontamination target pipe with the decontamination liquid, so that the decontamination liquid can be sprinkled on the inner surface of the decontamination target pipe, An object of the present invention is to provide a chemical decontamination apparatus and a chemical decontamination method for system piping that can efficiently perform chemical decontamination with a small amount of decontamination liquid and that do not cause air accumulation in a horizontal piping section.
[0010]
[Means for Solving the Problems]
The invention of claim 1 is a chemical decontamination apparatus for a system piping that chemically decontaminates by flowing a decontamination liquid from a chemical decontamination apparatus main body into a decontamination target pipe having a vertical piping section and a horizontal piping section.
A coupling flange is connected to each of the vertical pipe and the horizontal pipe, a circulation pipe is connected to each of the coupling flanges, a chemical decontamination apparatus body is connected to the circulation pipe, and the decontamination target pipe A chemical decontamination liquid circulation system in which a decontamination liquid circulates between the chemical decontamination apparatus main body and a branch coupling is connected to the outlet-side circulation pipe of the chemical decontamination apparatus main body. A watering pump is connected to one end of the watering hose at the outlet side of the watering pump, and the other end of the watering hose is inserted into the vertical pipe through the coupling flange on the vertical pipe side. A cleaning nozzle is provided, and a chemical decontamination system is configured to perform chemical decontamination by scanning the cleaning nozzle in the decontamination target pipe .
[0011]
The invention of claim 2 inserts a cleaning nozzle for sprinkling a chemical decontamination liquid from a chemical decontamination apparatus main body into a decontamination target pipe having a vertical pipe and a horizontal pipe, and the chemical decontamination is part of the decontamination target pipe. The chemical decontamination liquid circulation system is configured with the apparatus main body so that the chemical decontamination liquid is circulated between a part of the decontamination target pipe and the chemical decontamination apparatus main body while the cleaning is performed on the other side. The entire region of the decontamination target pipe is decontaminated by spraying the chemical decontamination solution with a nozzle.
[0012]
According to a third aspect of the present invention, the chemical decontamination liquid is discharged from the chemical decontamination apparatus body to the decontamination liquid circulation line constituting the decontamination target pipe and the chemical decontamination liquid circulation system, and the decontamination liquid is stirred. A cleaning nozzle is inserted.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the chemical decontamination method for system piping according to the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals.
The decontamination target pipe 4 includes a vertical pipe 4 a and a horizontal pipe 4 b, and the end of the horizontal pipe 4 b is partitioned by a stop valve 5. The target part to be decontaminated is from the stop valve 5 to the upper side of the vertical pipe 4a, and the part to be engaged with the chemical decontamination apparatus main body 1 is in the middle of the horizontal pipe 4b and the vertical pipe 4a of the decontamination target pipe 4 and the connecting flange 3 Are provided in two places. A coupling 3a is separately provided on the coupling flange 3 of the vertical pipe 4a.
[0016]
Although the details of the components of the chemical decontamination apparatus main body 1 are omitted in FIG. 1, a decontamination liquid storage tank, a circulation pump, a decontamination agent injection apparatus, a heat exchanger, a filter / ion exchange resin tower for waste liquid treatment And piping equipment.
[0017]
A circulation pipe 2 is connected to each of the inlet side and the outlet side of the chemical decontamination apparatus main body 1, and they are engaged by a coupling flange 3 provided on the decontamination target pipe 4, and the decontamination target pipe 4 and the chemical decontamination apparatus main body 1 A chemical decontamination liquid circulation loop is formed between the two.
[0018]
A branch pipe 13 is provided in the circulation pipe 2 on the decontamination liquid outlet side of the chemical decontamination apparatus body 1, and a watering pump 10 is connected to the branch pipe 13 via a pump pipe 9. A watering hose 11 having a watering nozzle 12 attached thereto is connected to the pump pipe 9 on the outlet side of this, and constitutes a chemical decontamination system.
[0019]
The cleaning nozzle 12 is inserted together with the watering hose 11 from the connection 3a into the decontamination target pipe 4, and scanning (moving) is performed while sprinkling water to the decontamination range of the vertical pipe 4a portion of the decontamination target pipe 4 to decontaminate. During the decontamination, the washing nozzle 12 is still watering at the boundary of the decontamination range of the decontamination target pipe 4 by the reaction force of the watering jet.
[0020]
The joint 3a is a flange having a through hole that can pass through the cleaning nozzle 12, the watering hose 11, and the circulation pipe 2 of the chemical decontamination apparatus body 1. In order to prevent dust and splashes due to watering from scattering, it is desirable that the joint 3a be configured such that a cover such as a vinyl cover can be attached. Since the anti-scattering attachment of the vinyl cover or the like can be generally performed, it is omitted in FIG.
[0021]
The method of chemical decontamination of the entire decontamination target pipe 4 is to spray the decontamination liquid from the cleaning nozzle 12 inserted up to the boundary of the upper decontamination range inside the vertical pipe 4a, and from the inner surface of the upper vertical pipe 4a to the lower side. The decontamination solution decontaminates the inner surface of the vertical pipe 4a while connecting the inner surface of the vertical pipe 4a to the inner surface of the horizontal pipe 4b (chemical decontamination system).
[0022]
The decontamination water level is the water level marked with a downward ▽ mark from the joint 3a, and the horizontal piping of the outlet side circulation pipe 2 and the decontamination target pipe 4 of the chemical decontamination apparatus body 1 inserted to the level below the water level (▽ mark). The decontamination liquid circulation system is connected to the chemical decontamination apparatus main body 1 and the horizontal pipe 4b of the decontamination target pipe 4 by the inlet side circulation pipe 2 of the chemical decontamination apparatus main body 1 connected by the coupling flange 3 in the section 4b. It is configured. Thereby, chemical decontamination can be performed by circulation between the lower part of the vertical piping 4a and the horizontal piping 4b.
[0023]
According to the present embodiment, the decontamination liquid 6 that has fallen along the pipe inner surface from the cleaning nozzle 12 above the vertical pipe 4a of the decontamination target pipe 4 flows down to this decontamination liquid 6 part, and the decontamination It is circulated in the liquid circulation system and processed by the chemical decontamination apparatus body 1. In this way, the entire region in the decontamination target pipe 4 is chemically treated with a small amount of decontamination liquid by the chemical decontamination system to decontaminate the decontamination liquid without filling up the vertical pipe 4a of the decontamination target pipe 4 with water. Can be decontaminated.
[0024]
Next, a second embodiment of the chemical decontamination method for system piping according to the present invention will be described with reference to FIG.
The second embodiment in FIG. 2 is intended for decontamination of the uncontaminated portion and the residual cladding 8 due to the air reservoir 7 generated in the horizontal piping 4 b of the decontamination target piping 4. In FIG. 2, the same parts as those in FIG.
[0025]
That is, in the present embodiment, as shown in FIG. 2, the cleaning nozzle 12 is moved to the vicinity of the stop valve 5 in the horizontal pipe 4b of the decontamination target pipe 4 and is circulated in the decontamination target pipe 4. Insert into Dye 6. Then, the cleaning nozzle 12 is moved back and forth inside the horizontal pipe 4b for scanning (moving).
[0026]
The cleaning nozzle 12 moves forward by the reaction force of jet water sprayed to the rear of the cleaning nozzle 12, and pulls the watering hose 11 with a force larger than the reaction force when moving backward. The inner surface of the horizontal pipe 4b is moved back and forth by pulling or separating the watering hose 11 while watering the decontamination liquid with the washing nozzle 12.
[0027]
According to this embodiment, while the water release the decontamination liquid by washing nozzle 12 stirring the decontamination liquid 6 of the horizontal pipe 4b, watering sites horizontal pipe 4b the upper is not yet decontamination sites air reservoir 7 Then, decontamination can be performed by dipping in the decontamination liquid 6. Further, the residual clad 8 accumulated at the bottom of the horizontal pipe 4b can be stirred and moved and discharged toward the coupling flange 3 connected to the chemical decontamination apparatus main body 1.
[0028]
Next, a third embodiment of the chemical decontamination method for system piping according to the present invention will be described with reference to FIG.
The present embodiment is an example in which the decontamination target pipe 4 is not filled with the decontamination liquid 6 and is almost decontaminated in the air. That is, as shown in FIG. 3, the cleaning nozzle 12 scans the inside of the vertical pipe 4a and the horizontal pipe 4b of the decontamination target pipe 4, and decontamination is performed by immersing the decontamination liquid in the inner surface.
[0029]
According to the present embodiment, it is also effective as a flushing method using water on the inner surface of the decontamination target pipe 4 after decontamination. Other effects are the same as those of the first and second embodiments.
[0030]
【The invention's effect】
According to the present invention, the entire decontamination target pipe can be decontaminated with a small amount of decontamination liquid without filling the entire area of the decontamination target pipe with the decontamination liquid, and the horizontal pipe part is not yet filled with air. Since decontamination sites and clad pools can be eliminated, chemical piping decontamination can be efficiently performed.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a piping system diagram for explaining a first embodiment of a chemical decontamination apparatus and a chemical decontamination method for a system pipe according to the present invention.
FIG. 2 is a piping system diagram for explaining a second embodiment of a chemical decontamination apparatus and chemical decontamination method for system piping according to the present invention.
FIG. 3 is a piping system diagram for explaining a third embodiment of a chemical decontamination apparatus and chemical decontamination method for system piping according to the present invention.
FIG. 4 is a piping system diagram for explaining a conventional chemical decontamination apparatus for system piping.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Chemical decontamination apparatus main body, 2 ... Circulation piping, 3 ... Coupling flange, 3a ... Coupling, 4 ... Decontamination object piping, 4a ... Vertical piping, 4b ... Horizontal piping, 5 ... Stop valve, 6 ... Decontamination liquid , 7 ... Air pool, 8 ... Residual cladding, 9 ... Pump piping, 10 ... Watering pump, 11 ... Watering hose, 12 ... Cleaning nozzle, 13 ... Branch connection.

Claims

In the chemical decontamination equipment of the system piping that decontaminates and circulates the decontamination liquid from the main body of the chemical decontamination equipment into the decontamination target pipe having the vertical piping section and the horizontal piping section,
A coupling flange is connected to each of the vertical pipe and the horizontal pipe, a circulation pipe is connected to each of the coupling flanges, a chemical decontamination apparatus body is connected to the circulation pipe, and the decontamination target pipe A chemical decontamination liquid circulation system in which a decontamination liquid circulates between the chemical decontamination apparatus main body and a branch coupling is connected to the outlet-side circulation pipe of the chemical decontamination apparatus main body. A watering pump is connected to one end of the watering hose at the outlet side of the watering pump, and the other end of the watering hose is inserted into the vertical pipe through the coupling flange on the vertical pipe side. A chemical decontamination apparatus for a system pipe, comprising a chemical decontamination system in which a cleaning nozzle is provided to perform chemical decontamination by scanning the cleaning nozzle in the pipe to be decontaminated.

A cleaning nozzle for sprinkling a chemical decontamination liquid from a chemical decontamination apparatus main body is inserted into a decontamination target pipe having a vertical pipe and a horizontal pipe, and the portion between the chemical decontamination apparatus main body and a part of the decontamination target pipe A chemical decontamination liquid circulation system is constructed to circulate the chemical decontamination liquid between a part of the decontamination target pipe and the chemical decontamination apparatus body, while the cleaning nozzle is used to circulate the chemical decontamination liquid. The system decontamination method for system piping using the system decontamination apparatus for system piping according to claim 1 , wherein the entire region of the decontamination target piping is decontaminated by spraying water.

Inserting a cleaning nozzle that discharges the chemical decontamination liquid from the main body of the chemical decontamination apparatus and stirs the decontamination liquid into the decontamination liquid circulation line constituting the decontamination target pipe and the chemical decontamination liquid circulation system. The chemical decontamination method for system piping according to claim 2 .