JP6876164B1 - Reactor pressure vessel dismantling device and reactor pressure vessel dismantling method - Google Patents

Reactor pressure vessel dismantling device and reactor pressure vessel dismantling method Download PDF

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JP6876164B1
JP6876164B1 JP2020010721A JP2020010721A JP6876164B1 JP 6876164 B1 JP6876164 B1 JP 6876164B1 JP 2020010721 A JP2020010721 A JP 2020010721A JP 2020010721 A JP2020010721 A JP 2020010721A JP 6876164 B1 JP6876164 B1 JP 6876164B1
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pressure vessel
reactor pressure
notch
upper wall
wall portion
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JP2021117107A (en
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貴史 吉田
貴史 吉田
雅則 西崎
雅則 西崎
大和 進藤
大和 進藤
文夫 富田
文夫 富田
勇樹 加茂
勇樹 加茂
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Toshiba Plant Systems and Services Corp
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    • 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
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Abstract

【課題】狭い作業スペースにおける原子炉圧力容器の解体の作業効率を向上させることができる原子炉圧力容器解体装置および原子炉圧力容器解体方法を提供する。【解決手段】原子炉圧力容器を吊り上げるロッド部材と、吊り上げられた原子炉圧力容器の上端部を切断する切断装置と、原子炉圧力容器の上端部を上方から覆う上壁部および部分的に上壁部を開放する扉部を有する蓋部材とを備え、切断装置は、上壁部の閉鎖状態において、上端部に上下方向に沿った直線状の切り込みと上下方向および原子炉圧力容器の周方向に沿ったＬ字状の切り込みであって直線状の切り込みの下端近傍に至る切り込みとを形成し、その後、上壁部の開放状態において、直線状の切り込みとＬ字状の切り込みとが繋がるように周方向に沿った仕上げ切断を行って切断片を切り離し、切断片は上壁部の開放によって形成された開口部を通して外部に取り出される。【選択図】図１PROBLEM TO BE SOLVED: To provide a reactor pressure vessel dismantling device and a reactor pressure vessel dismantling method capable of improving the work efficiency of dismantling a reactor pressure vessel in a narrow work space. SOLUTION: A rod member for lifting a reactor pressure vessel, a cutting device for cutting the upper end portion of the suspended reactor pressure vessel, and an upper wall portion and a partially upper portion covering the upper end portion of the reactor pressure vessel from above. The cutting device includes a lid member having a door portion that opens the wall portion, and the cutting device has a linear notch along the vertical direction at the upper end portion and a vertical direction and the circumferential direction of the reactor pressure vessel in the closed state of the upper wall portion. An L-shaped notch along the line that extends to the vicinity of the lower end of the straight notch is formed, and then the straight notch and the L-shaped notch are connected in the open state of the upper wall portion. A finish cut is made along the circumferential direction to separate the cut pieces, and the cut pieces are taken out through the opening formed by the opening of the upper wall portion. [Selection diagram] Fig. 1

Description

本発明による実施形態は、原子炉圧力容器解体装置および原子炉圧力容器解体方法に関する。 Embodiments according to the present invention relate to a reactor pressure vessel dismantling device and a reactor pressure vessel dismantling method.

原子力発電所の廃止措置においては、放射線量が高い原子炉圧力容器（ＰＲＶ）を遠隔操作によって切断して解体することが行われている。原子炉圧力容器は原子炉建屋内の狭いスペースに設置されているため、原子炉圧力容器の解体は、原子炉圧力容器の設置箇所近傍の狭い作業スペースで行うことが求められる。これまでにも、狭い作業スペースで原子炉圧力容器の解体を行うための技術が提案されている。 In the decommissioning of nuclear power plants, the reactor pressure vessel (PRV) with high radiation dose is cut and dismantled by remote control. Since the reactor pressure vessel is installed in a narrow space inside the reactor building, it is required to disassemble the reactor pressure vessel in a narrow work space near the installation location of the reactor pressure vessel. So far, techniques for dismantling the reactor pressure vessel in a narrow work space have been proposed.

しかしながら、従来は、狭い作業スペースにおける原子炉圧力容器の解体作業を放射性物質の飛散を抑制しながら効率的に行うことについて有効な提案がなされていないのが実情であった。 However, in the past, there has been no effective proposal for efficiently dismantling the reactor pressure vessel in a narrow work space while suppressing the scattering of radioactive materials.

実開昭６０−６５７００号公報Jitsukaisho 60-65700

本発明は上述した課題を解決するためになされたものであり、狭い作業スペースにおける原子炉圧力容器の解体作業を放射性物質の飛散を抑制しながら効率的に行うことができる原子炉圧力容器解体装置および原子炉圧力容器解体方法を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and is a reactor pressure vessel dismantling device capable of efficiently performing the dismantling work of the reactor pressure vessel in a narrow work space while suppressing the scattering of radioactive substances. And to provide a method for dismantling a reactor pressure vessel.

本実施形態による原子炉圧力容器解体装置は、少なくとも部分的に原子炉圧力容器の内部に位置した状態で原子炉圧力容器を吊り上げるロッド部材と、吊り上げられた原子炉圧力容器の上端部を切断する切断装置と、原子炉圧力容器の上端部を上方から覆う上壁部および部分的に上壁部を開放する扉部を有する蓋部材と、を備える。切断装置は、扉部によって上壁部が閉鎖された状態において、上端部に、上下方向に沿った直線状の切り込みと、上下方向および原子炉圧力容器の周方向に沿ったＬ字状の切り込みであって直線状の切り込みの下端近傍に至るＬ字状の切り込みとを形成する。直線状の切り込みおよびＬ字状の切り込みを形成した後に、切断装置は、扉部によって上壁部が開放された状態において、直線状の切り込みとＬ字状の切り込みとが繋がるように周方向に沿った仕上げ切断を行って上端部から切断片を切り離す。切断片は、上壁部の開放によって形成された開口部を通して蓋部材の外部に取り出される。 The reactor pressure vessel dismantling device according to the present embodiment cuts the rod member for lifting the reactor pressure vessel and the upper end of the suspended reactor pressure vessel at least partially located inside the reactor pressure vessel. It includes a cutting device and a lid member having an upper wall portion that covers the upper end portion of the reactor pressure vessel from above and a door portion that partially opens the upper wall portion. The cutting device has a linear notch along the vertical direction and an L-shaped notch along the vertical and circumferential directions of the reactor pressure vessel at the upper end when the upper wall is closed by the door. It forms an L-shaped notch that extends to the vicinity of the lower end of the straight notch. After forming the linear notch and the L-shaped notch, the cutting device performs the cutting device in the circumferential direction so that the linear notch and the L-shaped notch are connected in a state where the upper wall portion is opened by the door portion. Make a finish cut along and separate the cut piece from the top edge. The cut piece is taken out of the lid member through the opening formed by the opening of the upper wall portion.

本発明によれば、狭い作業スペースにおける原子炉圧力容器の解体作業を放射性物質の飛散を抑制しながら効率的に行うことができる。 According to the present invention, the dismantling work of the reactor pressure vessel in a narrow work space can be efficiently performed while suppressing the scattering of radioactive substances.

本実施形態による原子炉圧力容器解体装置を示す縦断面図である。It is a vertical cross-sectional view which shows the reactor pressure vessel dismantling apparatus by this embodiment. 本実施形態による原子炉圧力容器解体装置において、蓋部材および切断装置を示す斜視図である。It is a perspective view which shows the lid member and the cutting device in the reactor pressure vessel dismantling device by this embodiment. 本実施形態による原子炉圧力容器解体装置において、アーム部および収集容器を示す平面図である。It is a top view which shows the arm part and the collection container in the reactor pressure vessel dismantling apparatus by this embodiment. 本実施形態による原子炉圧力容器解体装置の動作例を示すフローチャートである。It is a flowchart which shows the operation example of the reactor pressure vessel dismantling apparatus by this embodiment. 本実施形態による原子炉圧力容器解体装置の動作例を示す側面図である。It is a side view which shows the operation example of the reactor pressure vessel dismantling apparatus by this embodiment. 図５に続く本実施形態による原子炉圧力容器解体装置の動作例を示す側面図である。FIG. 5 is a side view showing an operation example of the reactor pressure vessel dismantling device according to the present embodiment following FIG. 図６に続く本実施形態による原子炉圧力容器解体装置の動作例を示す側面図である。It is a side view which shows the operation example of the reactor pressure vessel dismantling apparatus by this embodiment following FIG. 図７に続く本実施形態による原子炉圧力容器解体装置の動作例を示す側面図である。FIG. 5 is a side view showing an operation example of the reactor pressure vessel dismantling device according to the present embodiment following FIG. 7. 図８に続く本実施形態による原子炉圧力容器解体装置の動作例を示す側面図である。FIG. 5 is a side view showing an operation example of the reactor pressure vessel dismantling device according to the present embodiment following FIG. 図９に続く本実施形態による原子炉圧力容器解体装置の動作例を示す側面図である。It is a side view which shows the operation example of the reactor pressure vessel dismantling apparatus by this embodiment following FIG. 図１０に続く本実施形態による原子炉圧力容器解体装置の動作例を示す側面図である。It is a side view which shows the operation example of the reactor pressure vessel dismantling apparatus by this embodiment following FIG. 本実施形態の変形例による原子炉圧力容器解体装置において、アーム部を示す受断面図である。It is a receiving cross-sectional view which shows the arm part in the reactor pressure vessel dismantling apparatus by the modification of this embodiment.

以下、図面を参照して本発明による実施形態を説明する。実施形態は、本発明を限定するものではない。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings. The embodiments are not limited to the present invention.

図１に示すように、本実施形態による原子炉圧力容器解体装置１は、原子炉建屋２内において遠隔操作による原子炉圧力容器３の解体に利用することができる。具体的な構成として、原子炉圧力容器解体装置１は、ロッド部材１１と、切断装置１２と、蓋部材１３と、排気装置１４と、収集容器１５と、クレーンの一例であるポーラークレーン１６と、把持装置４（図７参照）とを備える。以下、これらの原子炉圧力容器解体装置１の構成部について詳細に説明する。 As shown in FIG. 1, the reactor pressure vessel dismantling device 1 according to the present embodiment can be used for dismantling the reactor pressure vessel 3 by remote operation in the reactor building 2. As a specific configuration, the reactor pressure vessel dismantling device 1 includes a rod member 11, a cutting device 12, a lid member 13, an exhaust device 14, a collection vessel 15, a polar crane 16 which is an example of a crane, and the like. It is provided with a gripping device 4 (see FIG. 7). Hereinafter, the constituent parts of these reactor pressure vessel dismantling devices 1 will be described in detail.

（ロッド部材１１）
ロッド部材１１は、少なくとも部分的に原子炉圧力容器３の内部に位置した状態で原子炉圧力容器３を吊り上げる部材である。後述する切断装置１２は、例えば原子炉圧力容器３の上端部３ａの上下方向Ｄ２の幅に相当する所定の移動範囲で上下動する。このように上下方向Ｄ２への移動範囲が規制された切断装置１２に対してロッド部材１１が上方Ｄ２１に原子炉圧力容器３を吊り上げることで、上端部３ａの切断の進行に応じて新たな上端部３ａを切断装置１２による切断位置まで上昇させることができる。 (Rod member 11)
The rod member 11 is a member that lifts the reactor pressure vessel 3 while being at least partially located inside the reactor pressure vessel 3. The cutting device 12, which will be described later, moves up and down within a predetermined movement range corresponding to the width of the upper end portion 3a of the reactor pressure vessel 3 in the vertical direction D2, for example. By lifting the reactor pressure vessel 3 above D21 with respect to the cutting device 12 whose movement range in the vertical direction D2 is restricted in this way, a new upper end is newly formed according to the progress of cutting of the upper end 3a. The portion 3a can be raised to the cutting position by the cutting device 12.

また、ロッド部材１１は、建屋躯体２１内の狭い空間に設置された原子炉圧力容器３に対して内部に位置した状態で原子炉圧力容器３を吊り上げることで、狭い作業スペースにかかわらず原子炉圧力容器３の切断を適切に補助することができる。 Further, the rod member 11 lifts the reactor pressure vessel 3 in a state of being located inside the reactor pressure vessel 3 installed in a narrow space in the building frame 21, so that the reactor can be used regardless of the narrow work space. The cutting of the pressure vessel 3 can be appropriately assisted.

ロッド部材１１の外側には、ロッド部材１１を包囲する筒状体１１ａが配置されている。筒状体１１ａは、原子炉圧力容器３の内部および排気装置１４と連通している。筒状体１１ａが設けられていることで、筒状体１１ａを通して排気装置１４が原子炉圧力容器３の内部を排気することができる。 A tubular body 11a surrounding the rod member 11 is arranged on the outside of the rod member 11. The tubular body 11a communicates with the inside of the reactor pressure vessel 3 and the exhaust device 14. By providing the tubular body 11a, the exhaust device 14 can exhaust the inside of the reactor pressure vessel 3 through the tubular body 11a.

ロッド部材１１は、ロッド本体部１１１と、複数のアーム部１１２とを有する。 The rod member 11 has a rod main body portion 111 and a plurality of arm portions 112.

ロッド本体部１１１は、原子炉圧力容器３の上端部から内底部側にわたって延びている。すなわち、ロッド本体部１１１は、上下方向Ｄ２に長尺に形成されている。ロッド本体部１１１は、円柱形状を有しており、このロッド本体部１１１の外側に、ロッド本体部１１１の長手方向Ｄ２の所定範囲にわたってロッド本体部１１１と同心状の筒状体１１ａが設けられている。筒状体１１ａは、その上端側において排気装置１４の排気管１４１に接続され、その下端において原子炉圧力容器３の内部と連通している。ロッド本体部１１１の上端側には、後述するポーラークレーン１６を接続する接続部１１１１が設けられている。 The rod body 111 extends from the upper end of the reactor pressure vessel 3 to the inner bottom side. That is, the rod main body 111 is formed long in the vertical direction D2. The rod body 111 has a cylindrical shape, and a tubular body 11a concentric with the rod body 111 is provided outside the rod body 111 over a predetermined range in the longitudinal direction D2 of the rod body 111. ing. The tubular body 11a is connected to the exhaust pipe 141 of the exhaust device 14 at the upper end side thereof, and communicates with the inside of the reactor pressure vessel 3 at the lower end side thereof. A connecting portion 1111 for connecting the polar crane 16 described later is provided on the upper end side of the rod main body portion 111.

アーム部１１２は、ロッド本体部１１１の下端側においてロッド本体部１１１から原子炉圧力容器３の内周面３ｂ側に向かって放射状に延びている。アーム部１１２は、その内周面３ｂ側の端部において内周面３ｂに設けられた構造物に係合して原子炉圧力容器３の吊り上げを可能にする。より詳しくは、内周面３ｂ側のアーム部１１２の端部には、内周面３ｂから内方に突出する原子炉圧力容器３の突起部３１（すなわち、構造物）を挿入する凹部１１２１が設けられている。突起部３１は、原子炉圧力容器３の周方向Ｄ１に間隔を空けて内周面３ｂに複数設けられている。突起部３１は、原子炉圧力容器３内に収容されていた装置を支持していたものである。アーム部１１２は、複数の突起部３１のそれぞれを挿入できるように突起部３１に対応して設けられている。例えば、アーム部１１２は、突起部３１と同じ周方向Ｄ１の角度間隔で突起部３１と同数設けられている。 The arm portion 112 extends radially from the rod main body portion 111 toward the inner peripheral surface 3b side of the reactor pressure vessel 3 on the lower end side of the rod main body portion 111. The arm portion 112 engages with a structure provided on the inner peripheral surface 3b at the end portion on the inner peripheral surface 3b side to enable the lifting of the reactor pressure vessel 3. More specifically, at the end of the arm portion 112 on the inner peripheral surface 3b side, a recess 1121 for inserting a protrusion 31 (that is, a structure) of the reactor pressure vessel 3 protruding inward from the inner peripheral surface 3b is provided. It is provided. A plurality of protrusions 31 are provided on the inner peripheral surface 3b at intervals in the circumferential direction D1 of the reactor pressure vessel 3. The protrusion 31 supported the device housed in the reactor pressure vessel 3. The arm portion 112 is provided corresponding to the protrusion 31 so that each of the plurality of protrusions 31 can be inserted. For example, the arm portions 112 are provided in the same number as the protrusions 31 at the same angular interval in the circumferential direction D1 as the protrusions 31.

アーム部１１２の凹部１１２１に突起部３１を挿入する際には、先ず、ポーラークレーン１６によってロッド部材１１を吊り下げ、アーム部１１２が突起部３１と干渉しないようにアーム部１１２の周方向Ｄ１の位置をポーラークレーン１６の回転で調整したうえで、アーム部１１２が突起部３１と同じ高さになるまでロッド部材１１を下降させる。そして、アーム部１１２の凹部１１２１に突起部３１が挿入されるようにポーラークレーン１６によってロッド部材１１を周方向Ｄ１に回転させる。 When inserting the protrusion 31 into the recess 1121 of the arm portion 112, first, the rod member 11 is suspended by the polar crane 16 so that the arm portion 112 does not interfere with the protrusion 31 in the circumferential direction D1 of the arm portion 112. After adjusting the position by the rotation of the polar crane 16, the rod member 11 is lowered until the arm portion 112 is at the same height as the protrusion 31. Then, the rod member 11 is rotated in the circumferential direction D1 by the polar crane 16 so that the protrusion 31 is inserted into the recess 1121 of the arm portion 112.

このようにしてアーム部１１２の凹部１１２１に突起部３１が挿入された状態でロッド部材１１をポーラークレーン１６で吊り上げることで、ロッド部材１１は、原子炉圧力容器３の自重によって凹部１１２１の内底面に突起部３１の底面を当接させながら、原子炉圧力容器３を上方Ｄ２１に吊り上げることができる。また、アーム部１１２が原子炉圧力容器３の上端部３ａから下方Ｄ２２に離れたロッド本体部１１１の下端側に設けられていることで、アーム部１１２が原子炉圧力容器３の上端部３ａの切断を邪魔しないようにすることができる。 By lifting the rod member 11 with the polar crane 16 in the state where the protrusion 31 is inserted into the recess 1121 of the arm portion 112 in this way, the rod member 11 is lifted by the weight of the reactor pressure vessel 3 to the inner bottom surface of the recess 1121. The reactor pressure vessel 3 can be lifted upward to D21 while the bottom surface of the protrusion 31 is brought into contact with the surface. Further, since the arm portion 112 is provided on the lower end side of the rod main body portion 111 separated from the upper end portion 3a of the reactor pressure vessel 3 downward D22, the arm portion 112 is provided on the upper end portion 3a of the reactor pressure vessel 3. It can be done so that it does not interfere with the disconnection.

（蓋部材１３）
蓋部材１３は、原子炉圧力容器３の上端部３ａを覆う部材である。蓋部材１３は、原子炉圧力容器３の上端部３ａを上方から覆う上壁部１３１と、上壁部１３１を囲み、原子炉圧力容器３の上端部３ａを側方から覆う筒状の側壁部１３２とを有する。 (Lid member 13)
The lid member 13 is a member that covers the upper end portion 3a of the reactor pressure vessel 3. The lid member 13 has an upper wall portion 131 that covers the upper end portion 3a of the reactor pressure vessel 3 from above, and a tubular side wall portion that surrounds the upper wall portion 131 and covers the upper end portion 3a of the reactor pressure vessel 3 from the side. It has 132 and.

図２に示すように、上壁部１３１は、例えばモータ等の駆動源や歯車等の動力伝達部材で構成される駆動機１３３によって周方向Ｄ１に回転可能に構成されている。一方、図１に示すように、側壁部１３２は、建屋躯体２１の顎部２１ａ上に載置されることで不動状態に設置されている。 As shown in FIG. 2, the upper wall portion 131 is configured to be rotatable in the circumferential direction D1 by, for example, a drive machine 133 composed of a drive source such as a motor and a power transmission member such as a gear. On the other hand, as shown in FIG. 1, the side wall portion 132 is immobilized by being placed on the jaw portion 21a of the building skeleton 21.

上壁部１３１には、部分的に上壁部１３１を開放可能な扉部１３４が設けられている。より詳しくは、扉部１３４が開扉することで、上壁部１３１に開口部１３５が形成されて部分的に上壁部１３１が開放され、扉部１３４が閉扉することで、上壁部１３１が閉鎖される。例えば、扉部１３４は、モータ等の動力によって開閉可能な開き戸で構成することができる。 The upper wall portion 131 is provided with a door portion 134 capable of partially opening the upper wall portion 131. More specifically, when the door portion 134 is opened, the opening 135 is formed in the upper wall portion 131 to partially open the upper wall portion 131, and when the door portion 134 is closed, the upper wall portion 131 is formed. Is closed. For example, the door portion 134 can be composed of a hinged door that can be opened and closed by the power of a motor or the like.

上壁部１３１の中央には、上壁部１３１を上下に貫通する貫通孔１３ａが設けられており、この貫通孔１３ａを通してロッド本体部１１１の上端側および接続部１１１１が原子炉圧力容器３の外部に露出している。蓋部材１３によれば、原子炉圧力容器３の上端部３ａを覆うことで、上端部３ａの切断によって発生した切断粉、煙、微粒子などの放射性物質（スラッジと呼ばれることもある）が飛散することを抑制することができる。 A through hole 13a that penetrates the upper wall portion 131 up and down is provided in the center of the upper wall portion 131, and the upper end side of the rod main body portion 111 and the connection portion 1111 pass through the through hole 13a in the reactor pressure vessel 3. It is exposed to the outside. According to the lid member 13, by covering the upper end portion 3a of the reactor pressure vessel 3, radioactive substances (sometimes called sludge) such as cutting powder, smoke, and fine particles generated by cutting the upper end portion 3a are scattered. Can be suppressed.

（切断装置１２）
切断装置１２は、ロッド部材１１で吊り上げられた原子炉圧力容器３の上端部３ａを切断する装置である。 (Cutting device 12)
The cutting device 12 is a device that cuts the upper end portion 3a of the reactor pressure vessel 3 suspended by the rod member 11.

切断装置１２は、扉部１３４によって上壁部１３１が閉鎖された状態において、原子炉圧力容器３の上端部３ａに、上下方向Ｄ２に沿った直線状の切り込み３０（図５参照）と、上下方向Ｄ２および周方向Ｄ１に沿ったＬ字状の切り込み３１であって、直線状の切り込み３０の下端近傍に至るＬ字状の切り込み３１（図６参照）と、を形成する。 In the state where the upper wall portion 131 is closed by the door portion 134, the cutting device 12 makes a linear notch 30 (see FIG. 5) along the vertical direction D2 in the upper end portion 3a of the reactor pressure vessel 3 and up and down. An L-shaped notch 31 (see FIG. 6) that is an L-shaped notch 31 along the direction D2 and the circumferential direction D1 and extends to the vicinity of the lower end of the linear notch 30 is formed.

直線状の切り込み３０およびＬ字状の切り込み３１を形成した後に、切断装置１２は、扉部１３４によって上壁部１３１が開放された状態において、直線状の切り込み３０とＬ字状の切り込み３１とが繋がるように周方向Ｄ１に沿った仕上げ切断を行って上端部３ａから矩形状の切断片３２（図８参照）を切り離す。 After forming the linear notch 30 and the L-shaped notch 31, the cutting device 12 makes the linear notch 30 and the L-shaped notch 31 in a state where the upper wall portion 131 is opened by the door portion 134. A rectangular cut piece 32 (see FIG. 8) is separated from the upper end portion 3a by performing a finish cut along the circumferential direction D1 so as to connect the two.

切断片３２は、上壁部１３１の開放によって形成された開口部１３５を通して蓋部材１３の外部に取り出される（図９参照）。 The cut piece 32 is taken out of the lid member 13 through the opening 135 formed by opening the upper wall portion 131 (see FIG. 9).

切断片３２が蓋部材１３から取り出された後に、切断装置１２は、扉部１３４によって再び上壁部１３１が閉鎖された状態において、上端部３ａに、切断片３２の取り出しによって上端部３ａに形成された切欠き部３ｃの近傍に至る新たなＬ字状の切り込み３１を形成する（図１０参照）。 After the cutting piece 32 is taken out from the lid member 13, the cutting device 12 is formed on the upper end portion 3a in a state where the upper wall portion 131 is closed again by the door portion 134, and on the upper end portion 3a by taking out the cutting piece 32. A new L-shaped notch 31 is formed up to the vicinity of the notched portion 3c (see FIG. 10).

新たなＬ字状の切り込み３１を形成した後に、切断装置１２は、扉部１３４によって再び上壁部１３１が開放された状態において、切欠き部３ｃと新たなＬ字状の切り込み３１とが繋がるように周方向Ｄ１に沿った仕上げ切断を行って上端部３ａから新たな切断片３２を切り離す。 After forming the new L-shaped notch 31, the cutting device 12 connects the notch 3c and the new L-shaped notch 31 in a state where the upper wall portion 131 is opened again by the door portion 134. A finish cut is performed along the circumferential direction D1 so as to separate the new cutting piece 32 from the upper end portion 3a.

上壁部１３１の開放によって形成された開口部１３５を通して新たな切断片３２が蓋部材１３から取り出された後に、切断装置１２は、新たなＬ字状の切り込みの形成および新たな切断片の切り離しを繰り返す。 After the new cutting piece 32 is removed from the lid member 13 through the opening 135 formed by the opening of the upper wall portion 131, the cutting device 12 forms a new L-shaped notch and separates the new cutting piece. repeat.

このように、切断装置１２は、上壁部１３１を閉鎖した状態で直線状の切り込み３０またはＬ字状の切り込み３１を形成し、切断片３２の取り出しのために上壁部１３１を開放した状態で切断片３２を切り離す仕上げ切断を行うことで、上壁部１３１の開放時間を可及的に短縮して放射性物質の飛散を効果的に抑制することができる。また、直線状の切り込み３０または切欠き部３ｃの近傍に至るようにＬ字状の切り込み３１を形成することで、仕上げ切断の時間を短縮して上壁部１３１の開放時間をより効果的に短縮することができる。また、Ｌ字状の切り込み３１の形成および仕上げ切断によって切断片３２を切り離すことで、上端部３ａを少ない工数で効率的に切断することができる。 In this way, the cutting device 12 forms a linear notch 30 or an L-shaped notch 31 with the upper wall portion 131 closed, and opens the upper wall portion 131 for taking out the cut piece 32. By performing the finish cutting that separates the cut piece 32 with, the opening time of the upper wall portion 131 can be shortened as much as possible and the scattering of radioactive substances can be effectively suppressed. Further, by forming the L-shaped notch 31 so as to reach the vicinity of the linear notch 30 or the notch 3c, the time for finish cutting can be shortened and the opening time of the upper wall portion 131 can be made more effective. Can be shortened. Further, by separating the cutting piece 32 by forming the L-shaped notch 31 and finishing cutting, the upper end portion 3a can be efficiently cut with a small number of man-hours.

また、切断装置１２は、上下方向Ｄ２および周方向Ｄ１に沿って移動可能に蓋部材１３の上壁部１３１に配置されている。切断装置１２は、下方向Ｄ２２への移動にともなう原子炉圧力容器３の上端部３ａへの上下方向Ｄ２に沿った切り込みの形成と、周方向Ｄ１に沿った移動にともなう上端部３ａへの周方向Ｄ１に沿った切り込みの形成とを連続して行うことで、上端部３ａにＬ字状の切り込み３１を形成する。これにより、上端部３ａの切断をより効率的に行うことができる。 Further, the cutting device 12 is arranged on the upper wall portion 131 of the lid member 13 so as to be movable along the vertical direction D2 and the circumferential direction D1. The cutting device 12 forms a notch along the vertical direction D2 in the upper end portion 3a of the reactor pressure vessel 3 due to the movement in the downward direction D22, and the circumference to the upper end portion 3a due to the movement in the circumferential direction D1. By continuously forming the notch along the direction D1, an L-shaped notch 31 is formed at the upper end portion 3a. Thereby, the upper end portion 3a can be cut more efficiently.

また、切断装置１２は、上壁部１３１の回転にともなってＬ字状の切り込みの形成位置を周方向Ｄ１に変更する。 Further, the cutting device 12 changes the forming position of the L-shaped notch in the circumferential direction D1 with the rotation of the upper wall portion 131.

また、切断装置１２は、原子炉圧力容器３を熱切断する。熱切断には、例えばプロパンガスや酸素ガスを予熱ガスとして好適に用いることができる。より詳しくは、切断装置１２は、原子炉圧力容器３の上端部３ａに対して原子炉圧力容器３の外側から対向し、原子炉圧力容器３の外側から上端部３ａを熱切断する。さらに詳しくは、切断装置１２は、上端部３ａに酸素を吹き付けながら切断火口１２１から予熱ガスと酸素の反応で生じた高温の火炎を噴射し、火炎によって上端部３ａを燃焼させて溶融させる。そして、切断装置１２は、溶融部分を気流で吹き飛ばして溶融部分を除去することで、上端部３ａを切断する。 Further, the cutting device 12 thermally cuts the reactor pressure vessel 3. For thermal cutting, for example, propane gas or oxygen gas can be preferably used as the preheating gas. More specifically, the cutting device 12 faces the upper end portion 3a of the reactor pressure vessel 3 from the outside of the reactor pressure vessel 3 and thermally cuts the upper end portion 3a from the outside of the reactor pressure vessel 3. More specifically, the cutting device 12 injects a high-temperature flame generated by the reaction of the preheating gas and oxygen from the cutting crater 121 while blowing oxygen onto the upper end portion 3a, and the upper end portion 3a is burned and melted by the flame. Then, the cutting device 12 cuts the upper end portion 3a by blowing off the molten portion with an air flow to remove the molten portion.

また、切断装置１２は、図２に示すように、上壁部１３１の外周縁から上方Ｄ２１に突出するように設けられた平面円弧状の支持部１２２に、上下方向Ｄ２および周方向Ｄ１に沿って移動可能に支持されている。上下方向Ｄ２および周方向Ｄ１に沿った切断装置１２の移動は、例えば、モータ等の図示しない動力源の動力によってギアやタイミングベルト等の図示しない動力伝達部材を介して行われる。 Further, as shown in FIG. 2, the cutting device 12 is provided along the vertical direction D2 and the circumferential direction D1 on the plan arc-shaped support portion 122 provided so as to project from the outer peripheral edge of the upper wall portion 131 to the upper D21. It is supported so that it can be moved. The movement of the cutting device 12 along the vertical direction D2 and the circumferential direction D1 is performed, for example, by the power of a power source (not shown) such as a motor, via a power transmission member (not shown) such as a gear or a timing belt.

また、図２に示すように、切断装置１２は、支持部１２２よりも内側の上壁部１３１に設けられた平面円弧状の開口部１３１ａを通して上壁部１３１の下方Ｄ２２まで挿入されており、上壁部１３１の下方Ｄ２２において切断火口１２１を上端部３ａに対向させている。開口部１３１ａを通した放射性物質の飛散を防止するため、開口部１３１ａは、周方向Ｄ１に沿った切断装置１２の移動にともなって周方向Ｄ１に沿って伸縮する蛇腹構造１３１ｂによって閉塞されている。 Further, as shown in FIG. 2, the cutting device 12 is inserted to the lower D22 of the upper wall portion 131 through the plane arc-shaped opening 131a provided in the upper wall portion 131 inside the support portion 122. At the lower D22 of the upper wall portion 131, the cutting crater 121 faces the upper end portion 3a. In order to prevent the radioactive material from scattering through the opening 131a, the opening 131a is closed by a bellows structure 131b that expands and contracts along the circumferential direction D1 as the cutting device 12 moves along the circumferential direction D1. ..

このような上下方向Ｄ２および周方向Ｄ１に沿った切断装置１２の移動にともなう熱切断によれば、狭い作業スペースにかかわらず上端部３ａにＬ字状の切り込みを適切に形成することができる。 According to the thermal cutting accompanying the movement of the cutting device 12 along the vertical direction D2 and the circumferential direction D1, an L-shaped cut can be appropriately formed in the upper end portion 3a regardless of the narrow work space.

（把持装置４）
把持装置４は、上端部３ａの切断片３２を蓋部材１３から外部に取り出すために切断片３２を把持する装置である。把持装置４は、Ｌ字状の切り込み３１が形成された後に、上壁部１３１の開放によって形成された開口部１３５を通して原子炉圧力容器３の上端部３ａのうちの開口部１３５の直下に位置する取り出し対象部分３３まで下降して取り出し対象部分３３を把持する（図７参照）。 (Gripping device 4)
The gripping device 4 is a device that grips the cutting piece 32 in order to take out the cutting piece 32 of the upper end portion 3a from the lid member 13. The gripping device 4 is located directly below the opening 135 of the upper end 3a of the reactor pressure vessel 3 through the opening 135 formed by opening the upper wall 131 after the L-shaped notch 31 is formed. It descends to the take-out target portion 33 to grip the take-out target portion 33 (see FIG. 7).

取出し対象部分３３が把持装置４で把持された後に、切断装置１２は、取出し対象部分３３に形成されたＬ字状の切り込み３１が直線状の切り込み３０または切欠き部３ｃと繋がるように周方向Ｄ１に沿った仕上げ切断を行う。これにより、切断装置１２は、取出し対象部分３３を、把持装置４で把持されたまま切断片３２として上端部３ａから切り離す（図８参照）。 After the take-out target portion 33 is gripped by the gripping device 4, the cutting device 12 provides the cutting device 12 in the circumferential direction so that the L-shaped notch 31 formed in the take-out target portion 33 is connected to the linear notch 30 or the notch 3c. Finish cutting along D1 is performed. As a result, the cutting device 12 separates the extraction target portion 33 from the upper end portion 3a as a cutting piece 32 while being gripped by the gripping device 4 (see FIG. 8).

把持装置４は、上端部３ａから切り離された切断片３２を把持しながら開口部１３５を通して蓋部材１３の上方Ｄ２１に上昇することで、蓋部材１３から切断片３２を取り出す（図９参照）。 The gripping device 4 takes out the cut piece 32 from the lid member 13 by ascending to the upper D21 of the lid member 13 through the opening 135 while gripping the cut piece 32 separated from the upper end portion 3a (see FIG. 9).

なお、蓋部材１３は、切断片３２の取り出しの進行に応じて上壁部１３１を扉部１３４とともに周方向Ｄ１に回転させることで、扉部１３４の開扉によって形成される開口部１３５の直下に位置する取り出し対象部分３３を変更する。 The lid member 13 is directly below the opening 135 formed by opening the door 134 by rotating the upper wall 131 together with the door 134 in the circumferential direction D1 according to the progress of taking out the cutting piece 32. The extraction target portion 33 located at is changed.

（排気装置１４）
排気装置１４は、原子炉圧力容器３の内部を排気する装置である。排気装置１４は、ロッド本体部１１１の外側に配置された筒状体１１ａを通して原子炉圧力容器３の内部を排気する。 (Exhaust device 14)
The exhaust device 14 is a device that exhausts the inside of the reactor pressure vessel 3. The exhaust device 14 exhausts the inside of the reactor pressure vessel 3 through the tubular body 11a arranged outside the rod main body 111.

より詳しくは、排気装置１４は、ロッド本体部１１１の上端に接続された排気管１４１を通し筒状体１１ａに連通され、排気管１４１を通して筒状体１１ａ内に負圧を発生させることで、筒状体１１ａに連通された原子炉圧力容器３の内部を排気する。排気装置１４の本体部１４２は、例えば、送風機およびフィルタ等で構成することができる。 More specifically, the exhaust device 14 communicates with the tubular body 11a through the exhaust pipe 141 connected to the upper end of the rod main body 111, and generates a negative pressure in the tubular body 11a through the exhaust pipe 141. The inside of the reactor pressure vessel 3 communicating with the tubular body 11a is exhausted. The main body 142 of the exhaust device 14 can be composed of, for example, a blower, a filter, or the like.

排気装置１４によれば、原子炉圧力容器３の内部を排気することで、上端部３ａの切断によって発生した放射性物質を吸引して除去することができる。 According to the exhaust device 14, by exhausting the inside of the reactor pressure vessel 3, radioactive substances generated by cutting the upper end portion 3a can be sucked and removed.

（収集容器１５）
収集容器１５は、原子炉圧力容器３の内底部側に位置し、原子炉圧力容器３の切断で生じた落下物（すなわち、放射性物質）を収集する容器である。収集容器１５は、上方Ｄ２１に開口され、平面視において略扇形状を有する。 (Collection container 15)
The collection container 15 is located on the inner bottom side of the reactor pressure vessel 3 and is a container for collecting fallen objects (that is, radioactive substances) generated by cutting the reactor pressure vessel 3. The collection container 15 is opened upward D21 and has a substantially fan shape in a plan view.

収集容器１５は、持ち手１５１を有する。持ち手１５１は、例えば、収集容器１５の底面の上方Ｄ２１において水平方向に延びる棒状体で構成することができる。持ち手１５１を有することで、収集容器１５の設置や回収の際における取扱い性を向上させることができる。 The collection container 15 has a handle 151. The handle 151 can be composed of, for example, a rod-shaped body extending in the horizontal direction at D21 above the bottom surface of the collection container 15. By having the handle 151, it is possible to improve the handleability when installing and collecting the collection container 15.

収集容器１５は、周方向Ｄ１において隣り合うアーム部１１２同士の間においてアーム部１１２から垂れ下がるようにロッド部材１１に保持される。 The collection container 15 is held by the rod member 11 so as to hang down from the arm portions 112 between adjacent arm portions 112 in the circumferential direction D1.

収集容器１５によれば、原子炉圧力容器３の切断で生じた落下物を簡易な構成によって効率的に収集することができる。 According to the collection vessel 15, the fallen objects generated by cutting the reactor pressure vessel 3 can be efficiently collected by a simple configuration.

（ポーラークレーン１６）
ポーラークレーン１６は、ロッド部材１１を吊り上げる装置である。ポーラークレーン１６は、建屋躯体２１の上端部に設置され、ロープ１６１を介して吊り下げられた把持装置１６２によってロッド部材１１の接続部１１１１を把持することで、ロッド部材１１に接続される。ロッド部材１１を接続した状態で図示しない巻上機によってロープ１６１を巻き上げることで、ポーラークレーン１６はロッド部材１１を吊り上げることができる。 (Polar Crane 16)
The polar crane 16 is a device for lifting the rod member 11. The polar crane 16 is installed at the upper end of the building skeleton 21, and is connected to the rod member 11 by gripping the connecting portion 1111 of the rod member 11 by the gripping device 162 suspended via the rope 161. By hoisting the rope 161 with a hoist (not shown) with the rod member 11 connected, the polar crane 16 can lift the rod member 11.

ロッド部材１１を吊り上げることで、ロッド部材１１は、原子炉圧力容器３を吊り上げることができる。また、ポーラークレーン１６は、図示しないモータ等の動力源によって周方向Ｄ１に回転可能とされている。ロッド部材１１を吊り上げた状態で周方向Ｄ１に回転することで、ポーラークレーン１６はロッド部材１１を周方向Ｄ１に回転させることができる。 By lifting the rod member 11, the rod member 11 can lift the reactor pressure vessel 3. Further, the polar crane 16 can be rotated in the circumferential direction D1 by a power source such as a motor (not shown). By rotating the rod member 11 in the circumferential direction D1 while the rod member 11 is lifted, the polar crane 16 can rotate the rod member 11 in the circumferential direction D1.

ロッド部材１１を周方向Ｄ１に回転させることで、ロッド部材１１のアーム部１１２の凹部１１２１に原子炉圧力容器３の突起部３１を挿入することができる。 By rotating the rod member 11 in the circumferential direction D1, the protrusion 31 of the reactor pressure vessel 3 can be inserted into the recess 1121 of the arm portion 112 of the rod member 11.

（動作例）
次に、以上のように構成された原子炉圧力容器解体装置１の動作例について説明する。以下の動作は、全て自動で行ってもよく、部分的に手動で行ってもよい。図４に示すように、先ず、ロッド部材１１は、原子炉圧力容器３を吊り上げる（ステップＳ１）。このとき、蓋部材１３の扉部１３４は閉じられている。 (Operation example)
Next, an operation example of the reactor pressure vessel dismantling device 1 configured as described above will be described. The following operations may be performed automatically or partially manually. As shown in FIG. 4, first, the rod member 11 lifts the reactor pressure vessel 3 (step S1). At this time, the door portion 134 of the lid member 13 is closed.

原子炉圧力容器３を吊り上げた後、切断装置１２は、切断火口１２１から火炎を噴射しながら下方Ｄ２２に移動することで、上端部３ａに上下方向Ｄ２に沿った直線状の切り込み３０を形成する（ステップＳ２，図５）。 After lifting the reactor pressure vessel 3, the cutting device 12 moves downward D22 while injecting flame from the cutting crater 121 to form a linear notch 30 along the vertical direction D2 at the upper end 3a. (Step S2, FIG. 5).

直線状の切り込み３０を形成した後、切断装置１２は、直線状の切り込み３０の下端近傍に至るＬ字状の切り込み３１を形成する（ステップＳ３，図６）。このとき、切断装置１２は、熱切断によって、下方向Ｄ２２への移動にともなう上端部３ａへの上下方向Ｄ２に沿った切り込みの形成と、周方向Ｄ１に沿った移動にともなう上端部３ａへの周方向Ｄ１に沿った切り込みの形成とを連続して行うことで、上端部３ａにＬ字状の切り込み３１を形成する。これによって、図６に示すように、１つの矩形状の切断片３２の切り出しに必要な切断の殆どを実施して、仕上げ切断のための僅かな未切断箇所のみを残すことができる。このため、扉部１３４の開扉をともなう仕上げ切断の時間を短縮して放射性物質の飛散を効果的に抑制することができる。 After forming the linear notch 30, the cutting device 12 forms an L-shaped notch 31 that reaches the vicinity of the lower end of the linear notch 30 (steps S3 and FIG. 6). At this time, the cutting device 12 forms a notch along the vertical direction D2 in the upper end portion 3a due to the movement in the downward direction D22 by thermal cutting, and makes a cut in the upper end portion 3a due to the movement in the circumferential direction D1. By continuously forming a notch along the circumferential direction D1, an L-shaped notch 31 is formed at the upper end portion 3a. As a result, as shown in FIG. 6, most of the cutting required for cutting out one rectangular cut piece 32 can be performed, leaving only a few uncut portion for finish cutting. Therefore, it is possible to shorten the time for finish cutting accompanied by opening the door portion 134 and effectively suppress the scattering of radioactive substances.

Ｌ字状の切り込み３１を形成した後、矩形状の切断片３２を取り出すための仕上げ切断を行うために、蓋部材１３の扉部１３４を開扉する（ステップＳ４）。 After forming the L-shaped notch 31, the door portion 134 of the lid member 13 is opened in order to perform a finish cut for taking out the rectangular cut piece 32 (step S4).

扉部１３４を開扉した後、クレーンで吊り下げられた把持装置４を、扉部１３４の開扉によって形成された開口部１３５を通して上端部３ａのうちの開口部１３５の直下に位置する取り出し対象部分３３まで下降させ、下降された把持装置４で取り出し対象部分３３を把持する（ステップＳ５，図７）。 After opening the door portion 134, the gripping device 4 suspended by a crane is taken out from the gripping device 4 which is located directly below the opening portion 135 of the upper end portion 3a through the opening portion 135 formed by opening the door portion 134. It is lowered to the portion 33, and the taken-out target portion 33 is gripped by the lowered gripping device 4 (steps S5 and FIG. 7).

把持装置４で取り出し対象部分３３を把持した後、切断装置１２は、周方向Ｄ１に沿った移動にともなって、取り出し対象部分３３に形成されたＬ字状の切り込み３１が直線状の切り込み３０と繋がるように周方向Ｄ１に沿った仕上げ切断を行う（ステップＳ６，図８）。仕上げ切断により、把持装置４で把持された状態で、取り出し対象部分３３を矩形状の切断片３２として上端部３ａから切り離す。把持装置４で把持されているので、切断片３２は落下しない。 After gripping the take-out target portion 33 with the gripping device 4, the cutting device 12 has an L-shaped notch 31 formed in the take-out target portion 33 as a linear notch 30 as it moves along the circumferential direction D1. Finish cutting is performed along the circumferential direction D1 so as to be connected (step S6, FIG. 8). By finish cutting, the take-out target portion 33 is separated from the upper end portion 3a as a rectangular cut piece 32 in a state of being gripped by the gripping device 4. Since it is gripped by the gripping device 4, the cut piece 32 does not fall.

仕上げ切断を行った後、クレーンで把持装置４を引き上げることで、開口部１３５を通して蓋部材１３の外部に切断片３２を取り出す（ステップＳ７，図９）。取り出された切断片３２は、所定の保管場所に移動される。このように、Ｌ字状の切り込み３１を形成する際に閉扉されていた扉部１３４を一時的に開扉して仕上げ切断を行うことで、放射性物質の飛散を可及的に抑制しつつ切断片３２を取り出すことができる。 After the finish cutting is performed, the gripping device 4 is pulled up by a crane to take out the cutting piece 32 to the outside of the lid member 13 through the opening 135 (step S7, FIG. 9). The removed piece 32 is moved to a predetermined storage location. In this way, by temporarily opening the door portion 134 that was closed when forming the L-shaped notch 31 and performing finish cutting, cutting is performed while suppressing the scattering of radioactive substances as much as possible. The piece 32 can be taken out.

切断片３２を取り出した後、扉部１３４を閉扉することで上壁部１３１を閉鎖する（ステップＳ８）。 After taking out the cut piece 32, the upper wall portion 131 is closed by closing the door portion 134 (step S8).

扉部１３４を閉扉した後、新たな切断片３２の取り出しを行わない場合（ステップＳ９：Ｎｏ）、処理を終了する。 When the new cutting piece 32 is not taken out after closing the door portion 134 (step S9: No), the process ends.

一方、新たな切断片３２の取り出しを行う場合（ステップＳ９：Ｙｅｓ）、切断装置１２は、切断片３２の取り出しによって形成された切欠き部３ｃの近傍に至る新たなＬ字状の切り込み３１を形成する（ステップＳ１０，図１０）。それ以降は、ステップＳ４以下の処理を繰り返すことで、新たな切断片３２の取り出しを行う（図１１参照）。 On the other hand, when the new cutting piece 32 is taken out (step S9: Yes), the cutting device 12 makes a new L-shaped notch 31 that reaches the vicinity of the notch portion 3c formed by taking out the cutting piece 32. Form (step S10, FIG. 10). After that, by repeating the process of step S4 and subsequent steps, a new cut piece 32 is taken out (see FIG. 11).

以上述べたように、本実施形態によれば、ロッド部材１１が、少なくとも部分的に原子炉圧力容器３の内部に位置した状態で原子炉圧力容器３を吊り上げ、切断装置１２が、扉部１３４によって上壁部１３１が閉鎖された状態において、上端部３ａに、直線状の切り込み３０と、直線状の切り込み３０の下端近傍に至るＬ字状の切り込み３１とを形成し、その後、扉部１３４によって上壁部１３１が開放された状態において、直線状の切り込み３０とＬ字状の切り込み３１とが繋がるように周方向Ｄ１に沿った仕上げ切断を行って切断片３２を切り離すことで、狭い作業スペースにおける原子炉圧力容器３の解体作業を放射性物質の飛散を抑制しながら効率的に行うことができる。 As described above, according to the present embodiment, the reactor pressure vessel 3 is lifted with the rod member 11 at least partially located inside the reactor pressure vessel 3, and the cutting device 12 is the door portion 134. In a state where the upper wall portion 131 is closed, a linear notch 30 and an L-shaped notch 31 extending to the vicinity of the lower end of the linear notch 30 are formed at the upper end portion 3a, and then the door portion 134. In a state where the upper wall portion 131 is opened, a finishing cut is performed along the circumferential direction D1 so that the linear notch 30 and the L-shaped notch 31 are connected, and the cut piece 32 is separated to perform a narrow work. The dismantling work of the reactor pressure vessel 3 in the space can be efficiently performed while suppressing the scattering of radioactive materials.

また、本実施形態によれば、切断片３２が取り出された後に、切断装置１２が、扉部１３４によって再び上壁部１３１が閉鎖された状態において、上端部３ａに、切断片３２の取り出しによって形成された切欠き部３ｃの近傍に至る新たなＬ字状の切り込み３１を形成し、新たなＬ字状の切り込み３１を形成した後に、扉部１３４によって再び上壁部１３１が開放された状態において、切欠き部３ｃと新たなＬ字状の切り込み３１とが繋がるように周方向Ｄ１に沿った仕上げ切断を行って上端部３ａから新たな切断片３２を切り離す。そして、上壁部１３１の開放によって形成された開口部１３５を通して新たな切断片３２が取り出された後に、切断装置１２が、新たなＬ字状の切り込み３１の形成および新たな切断片３２の切り離しを繰り返す。これにより、放射性物質の飛散を抑制した効率的な解体作業を継続的に行うことができる。 Further, according to the present embodiment, after the cutting piece 32 is taken out, the cutting device 12 takes out the cutting piece 32 to the upper end portion 3a in a state where the upper wall portion 131 is closed again by the door portion 134. A state in which a new L-shaped notch 31 that reaches the vicinity of the formed notch 3c is formed, a new L-shaped notch 31 is formed, and then the upper wall portion 131 is opened again by the door portion 134. In, a finish cut is performed along the circumferential direction D1 so that the notch portion 3c and the new L-shaped notch 31 are connected, and the new cutting piece 32 is separated from the upper end portion 3a. Then, after the new cutting piece 32 is taken out through the opening 135 formed by opening the upper wall portion 131, the cutting device 12 forms a new L-shaped notch 31 and separates the new cutting piece 32. repeat. As a result, efficient dismantling work that suppresses the scattering of radioactive substances can be continuously performed.

また、本実施形態によれば、切断装置１２が、下方Ｄ２２への移動にともなう上端部３ａへの上下方向Ｄ２の切り込みの形成と、周方向Ｄ１への移動にともなう上端部３ａへの周方向Ｄ１の切り込みの形成とを連続して行うことで、Ｌ字形状の切り込み３１の形成を簡便かつ効率的に行うことができる。 Further, according to the present embodiment, the cutting device 12 forms a notch in the vertical direction D2 in the upper end portion 3a due to the movement in the downward direction D22, and a circumferential direction in the upper end portion 3a due to the movement in the circumferential direction D1. By continuously forming the notch in D1, the L-shaped notch 31 can be formed easily and efficiently.

また、本実施形態によれば、切断装置１２が、下方向Ｄ２２への移動にともなう上端部３ａへの上下方向Ｄ２に沿った切り込みの形成と、周方向Ｄ１に沿った移動にともなう上端部３ａへの周方向Ｄ１に沿った切り込みの形成とを連続して行うことで、上端部３ａにＬ字状の切り込み３１を効率的に形成することができる。 Further, according to the present embodiment, the cutting device 12 forms a notch in the upper end portion 3a in the downward direction D22 along the vertical direction D2, and the upper end portion 3a in the circumferential direction D1. By continuously forming the notch along the circumferential direction D1, the L-shaped notch 31 can be efficiently formed at the upper end portion 3a.

また、本実施形態によれば、切断装置１２が、上壁部１３１の回転にともなってＬ字状の切り込み３１の形成位置を周方向Ｄ１に変更することで、簡易な構成によって切断片３２の取出しを周方向Ｄ１に適切に進行させることができる。 Further, according to the present embodiment, the cutting device 12 changes the forming position of the L-shaped notch 31 to the circumferential direction D1 with the rotation of the upper wall portion 131, so that the cutting piece 32 has a simple configuration. The extraction can be appropriately advanced in the circumferential direction D1.

また、本実施形態によれば、把持装置４が、Ｌ字状の切り込み３１が形成された後に、上壁部１３１の開放によって形成された開口部１３５を通して上端部３ａのうちの開口部１３５の直下に位置する取り出し対象部分３３まで下降して取り出し対象部分３３を把持し、切断装置１２が、取出し対象部分３３に形成されたＬ字状の切り込み３１が直線状の切り込み３０または切欠き部３ｃと繋がるように周方向Ｄ１に沿った仕上げ切断を行うことで、取出し対象部分３３を把持装置４で把持されたまま切断片３２として上端部３ａから切り離す。そして、把持装置４が、切断片３２を把持しながら開口部１３５を通して蓋部材１３の上方に上昇することで切断片３２を取り出す。これにより、放射性物質の飛散を可及的に抑制しつつ切断片３２を取り出すことができる。 Further, according to the present embodiment, the gripping device 4 passes through the opening 135 formed by opening the upper wall portion 131 after the L-shaped notch 31 is formed, and then the opening 135 of the upper end portion 3a. The take-out target portion 33 is lowered to the take-out target portion 33 located directly below to grip the take-out target portion 33, and the cutting device 12 has an L-shaped notch 31 formed in the take-out target portion 33 having a linear notch 30 or a notch 3c. By performing a finish cut along the circumferential direction D1 so as to be connected to, the take-out target portion 33 is separated from the upper end portion 3a as a cutting piece 32 while being gripped by the gripping device 4. Then, the gripping device 4 takes out the cut piece 32 by ascending above the lid member 13 through the opening 135 while gripping the cut piece 32. As a result, the cut piece 32 can be taken out while suppressing the scattering of radioactive substances as much as possible.

また、本実施形態によれば、排気装置１４が原子炉圧力容器３の内部を排気することで、上端部３ａの切断によって発生した放射性物質を吸引して除去することができる。 Further, according to the present embodiment, the exhaust device 14 exhausts the inside of the reactor pressure vessel 3, so that radioactive substances generated by cutting the upper end portion 3a can be sucked and removed.

また、本実施形態によれば、ロッド部材１１の外側に原子炉圧力容器３の内部および排気装置１４と連通する筒状体１１ａを設け、排気装置１４が、筒状体１１ａを通して原子炉圧力容器３の内部を排気することで、狭い作業スペースでの放射性物質の除去を効率的に行うことができる。 Further, according to the present embodiment, the inside of the reactor pressure vessel 3 and the tubular body 11a communicating with the exhaust device 14 are provided on the outside of the rod member 11, and the exhaust device 14 passes through the tubular body 11a to provide the reactor pressure vessel. By exhausting the inside of No. 3, radioactive substances can be efficiently removed in a narrow work space.

また、本実施形態によれば、収集容器１５が、原子炉圧力容器３の内底部側に位置し、原子炉圧力容器３の切断で生じた落下物を収集することで、排気装置１４で除去し切れなかった放射性物質を効率的に回収することができる。 Further, according to the present embodiment, the collection vessel 15 is located on the inner bottom side of the reactor pressure vessel 3, and the fallen object generated by the cutting of the reactor pressure vessel 3 is collected and removed by the exhaust device 14. It is possible to efficiently recover the radioactive material that has not been completely removed.

また、本実施形態によれば、収集容器１５が、上方に開口され、平面視において略扇形状を有することで、原子炉圧力容器３の内底部側に複数の収集容器１５を隙間少なく敷き詰めることができるので、放射性物質をより適正に回収することができる。 Further, according to the present embodiment, the collection vessel 15 is opened upward and has a substantially fan shape in a plan view, so that a plurality of collection vessels 15 are spread on the inner bottom side of the reactor pressure vessel 3 with a small gap. Therefore, radioactive substances can be recovered more appropriately.

また、本実施形態によれば、ロッド部材１１が、原子炉圧力容器３の上端部３ａ側から内底部側にわたって延びるロッド本体部１１１と、ロッド本体部１１１の下端側においてロッド本体部１１１から原子炉圧力容器３の内周面３ｂ側に向かって放射状に延び、内周面３ｂ側の端部において内周面３ｂに設けられた構造物３１に係合して原子炉圧力容器３の吊り上げを可能にする複数のアーム部１１２と、を有し、収集容器１５が、周方向Ｄ１において隣り合うアーム部１１２同士の間においてアーム部１１２から垂れ下がるようにロッド部材１１に保持される。これにより、ロッド部材１１の構造を活用して収集容器１５を適切に保持することができる。 Further, according to the present embodiment, the rod member 11 extends from the upper end 3a side of the reactor pressure vessel 3 to the inner bottom side, and the rod main body 111 extends from the rod main body 111 to the lower end side of the rod main body 111. It extends radially toward the inner peripheral surface 3b side of the reactor pressure vessel 3 and engages with the structure 31 provided on the inner peripheral surface 3b at the end on the inner peripheral surface 3b side to lift the reactor pressure vessel 3. It has a plurality of arm portions 112 that enable the collection container 15, and the collection container 15 is held by the rod member 11 so as to hang down from the arm portions 112 between adjacent arm portions 112 in the circumferential direction D1. As a result, the collection container 15 can be appropriately held by utilizing the structure of the rod member 11.

また、本実施形態によれば、切断装置１２が原子炉圧力容器３を熱切断することで、Ｌ字状の切り込み３１を効率的かつ適切に形成することができる。 Further, according to the present embodiment, the cutting device 12 thermally cuts the reactor pressure vessel 3 to efficiently and appropriately form the L-shaped notch 31.

（変形例）
次に、本実施形態の変形例による原子炉圧力容器解体装置１について説明する。図６に示すように、本変形例による原子炉圧力容器解体装置１は、上述した構成に加えて、更に、アーム部１１２が、収集容器１５の開口部１５ａよりも上方Ｄ２１に突出した凸部１１２２を有する。凸部１１２２は、開口部１５ａから周方向Ｄ１に沿って離れるのにしたがって上方Ｄ２１に向かって傾斜した傾斜面１１２２ａが設けられている。 (Modification example)
Next, the reactor pressure vessel dismantling device 1 according to the modified example of the present embodiment will be described. As shown in FIG. 6, in the reactor pressure vessel dismantling device 1 according to the present modification, in addition to the above-described configuration, the arm portion 112 further has a convex portion protruding upward D21 from the opening 15a of the collection vessel 15. It has 1122. The convex portion 1122 is provided with an inclined surface 1122a that is inclined toward the upper D21 as it is separated from the opening 15a along the circumferential direction D1.

本変形例によれば、上端部３ａの切断によってアーム部１１２上に落下した落下物を、傾斜面１１２２ａに衝突させて収集容器１５内に落下させることができる。これにより、切断によって生じた落下物をより効率的に収集することができる。 According to this modification, a falling object that has fallen on the arm portion 112 due to cutting of the upper end portion 3a can collide with the inclined surface 1122a and be dropped into the collection container 15. As a result, the falling objects generated by cutting can be collected more efficiently.

本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。 Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

１ 原子炉圧力容器解体装置
１１ ロッド部材
１２ 切断装置
３ 原子炉圧力容器
３ａ 上端部 1 Reactor pressure vessel dismantling device 11 Rod member 12 Cutting device 3 Reactor pressure vessel 3a Upper end

Claims (16)

少なくとも部分的に原子炉圧力容器の内部に位置した状態で前記原子炉圧力容器を吊り上げるロッド部材と、
前記吊り上げられた原子炉圧力容器の上端部を切断する切断装置と、
前記原子炉圧力容器の上端部を上方から覆う上壁部および部分的に前記上壁部を開放する扉部を有する蓋部材と、を備え、
前記切断装置は、前記扉部によって前記上壁部が閉鎖された状態において、前記上端部に、上下方向に沿った直線状の切り込みと、前記上下方向および前記原子炉圧力容器の周方向に沿ったＬ字状の切り込みであって前記直線状の切り込みの下端近傍に至るＬ字状の切り込みとを形成し、前記直線状の切り込みおよび前記Ｌ字状の切り込みを形成した後に、前記扉部によって前記上壁部が開放された状態において、前記直線状の切り込みと前記Ｌ字状の切り込みとが繋がるように前記周方向に沿った仕上げ切断を行って前記上端部から切断片を切り離し、
前記切断片は、前記上壁部の開放によって形成された開口部を通して前記蓋部材の外部に取り出される、原子炉圧力容器解体装置。 A rod member that lifts the reactor pressure vessel at least partially located inside the reactor pressure vessel.
A cutting device that cuts the upper end of the suspended reactor pressure vessel,
A lid member having an upper wall portion that covers the upper end portion of the reactor pressure vessel from above and a door portion that partially opens the upper wall portion is provided.
The cutting device has a linear notch along the vertical direction and along the vertical direction and the circumferential direction of the reactor pressure vessel at the upper end portion in a state where the upper wall portion is closed by the door portion. An L-shaped notch that extends to the vicinity of the lower end of the straight notch is formed, and after the straight notch and the L-shaped notch are formed, the door portion is used. With the upper wall portion open, a finish cut is performed along the circumferential direction so that the linear notch and the L-shaped notch are connected, and the cut piece is separated from the upper end portion.
A reactor pressure vessel dismantling device in which the cut pieces are taken out of the lid member through an opening formed by opening the upper wall portion. 前記切断装置は、前記切断片が取り出された後に、前記扉部によって再び前記上壁部が閉鎖された状態において、前記上端部に、前記切断片の取り出しによって前記上端部に形成された切欠き部の近傍に至る新たなＬ字状の切り込みを形成し、前記新たなＬ字状の切り込みを形成した後に、前記扉部によって再び前記上壁部が開放された状態において、前記切欠き部と前記新たなＬ字状の切り込みとが繋がるように前記周方向に沿った仕上げ切断を行って前記上端部から新たな切断片を切り離し、前記上壁部の開放によって形成された前記開口部を通して前記新たな切断片が取り出された後に、新たなＬ字状の切り込みの形成および新たな切断片の切り離しを繰り返す、請求項１に記載の原子炉圧力容器解体装置。 The cutting device has a notch formed in the upper end portion of the upper end portion and in the upper end portion by taking out the cut piece in a state where the upper wall portion is closed again by the door portion after the cut piece is taken out. After forming a new L-shaped notch to reach the vicinity of the portion and forming the new L-shaped notch, in a state where the upper wall portion is opened again by the door portion, the notch portion and the notch portion are formed. A finish cut is performed along the circumferential direction so as to be connected to the new L-shaped notch, a new cut piece is separated from the upper end portion, and the opening is formed by opening the upper wall portion. The reactor pressure vessel dismantling device according to claim 1, wherein after a new piece is taken out, the formation of a new L-shaped notch and the separation of the new piece are repeated. 前記切断装置は、前記上下方向および前記周方向に沿って移動可能に前記蓋部材の上壁部に配置され、下方向への移動にともなう前記原子炉圧力容器の上端部への上下方向に沿った切り込みの形成と、前記周方向に沿った移動にともなう前記上端部への前記周方向に沿った切り込みの形成とを連続して行うことで、前記上端部に前記Ｌ字状の切り込みを形成する、請求項１または２に記載の原子炉圧力容器解体装置。 The cutting device is movably arranged on the upper wall portion of the lid member so as to be movable along the vertical direction and the circumferential direction, and is along the vertical direction toward the upper end portion of the reactor pressure vessel with the downward movement. The L-shaped notch is formed in the upper end portion by continuously forming the notch and the notch along the circumferential direction in the upper end portion due to the movement along the circumferential direction. The reactor pressure vessel dismantling device according to claim 1 or 2. 前記蓋部材の上壁部は、前記周方向に回転可能であり、
前記切断装置は、前記上壁部の回転にともなって前記Ｌ字状の切り込みの形成位置を前記周方向に変更する、請求項３に記載の原子炉圧力容器解体装置。 The upper wall portion of the lid member is rotatable in the circumferential direction and can be rotated.
The reactor pressure vessel dismantling device according to claim 3, wherein the cutting device changes the formation position of the L-shaped notch in the circumferential direction with the rotation of the upper wall portion. 前記切断片を把持する把持装置を更に備え、
前記把持装置は、前記Ｌ字状の切り込みが形成された後に、前記上壁部の開放によって形成された前記開口部を通して前記原子炉圧力容器の上端部のうちの前記開口部の直下に位置する取り出し対象部分まで下降して前記取り出し対象部分を把持し、
前記切断装置は、前記取り出し対象部分に形成されたＬ字状の切り込みが前記直線状の切り込みまたは前記切欠き部と繋がるように前記周方向に沿った仕上げ切断を行うことで、前記取り出し対象部分を前記把持装置で把持されたまま切断片として前記上端部から切り離し、
前記把持装置は、前記切断片を把持しながら前記開口部を通して前記蓋部材の上方に上昇することで前記切断片を取り出す、請求項２に記載の原子炉圧力容器解体装置。 A gripping device for gripping the cut piece is further provided.
The gripping device is located directly below the opening of the upper end of the reactor pressure vessel through the opening formed by opening the upper wall after the L-shaped notch is formed. Descend to the take-out target part, grasp the take-out target part, and
The cutting device, by performing a finishing cutting along said circumferential direction so that the cut of the Eject L-shape is formed in the target portion connected to the straight cut or the cut-out portion, the preparative The portion to be ejected is separated from the upper end portion as a cutting piece while being gripped by the gripping device.
The reactor pressure vessel dismantling device according to claim 2 , wherein the gripping device takes out the cut piece by ascending above the lid member through the opening while gripping the cut piece. 前記蓋部材の上壁部は、前記周方向に回転可能であり、
前記蓋部材は、前記上壁部を回転させることで前記取り出し対象部分を変更する、請求項５に記載の原子炉圧力容器解体装置。 The upper wall portion of the lid member is rotatable in the circumferential direction and can be rotated.
The reactor pressure vessel dismantling device according to claim 5, wherein the lid member changes the take-out target portion by rotating the upper wall portion. 前記原子炉圧力容器の内部を排気する排気装置を更に備える請求項１〜６のいずれか１項に記載の原子炉圧力容器解体装置。 The reactor pressure vessel dismantling device according to any one of claims 1 to 6, further comprising an exhaust device for exhausting the inside of the reactor pressure vessel. 前記ロッド部材を包囲するように前記ロッド部材の外側に配置され、前記原子炉圧力容器の内部および前記排気装置と連通する筒状体を更に備え、
前記排気装置は、前記筒状体を通して前記原子炉圧力容器の内部を排気する、請求項７に記載の原子炉圧力容器解体装置。 A tubular body arranged outside the rod member so as to surround the rod member and communicating with the inside of the reactor pressure vessel and the exhaust device is further provided.
The reactor pressure vessel dismantling device according to claim 7, wherein the exhaust device exhausts the inside of the reactor pressure vessel through the tubular body. 前記原子炉圧力容器の内底部側に位置し、前記原子炉圧力容器の切断で生じた落下物を収集する収集容器を更に備える請求項１〜８のいずれか１項に記載の原子炉圧力容器解体装置。 The reactor pressure vessel according to any one of claims 1 to 8, further comprising a collection vessel located on the inner bottom side of the reactor pressure vessel and collecting falling objects generated by cutting the reactor pressure vessel. Dismantling device. 前記収集容器は、上方に開口され、平面視において略扇形状を有する請求項９に記載の原子炉圧力容器解体装置。 The reactor pressure vessel dismantling device according to claim 9, wherein the collection vessel is opened upward and has a substantially fan shape in a plan view. 前記収集容器は、持ち手を有する請求項９または１０に記載の原子炉圧力容器解体装置。 The reactor pressure vessel dismantling device according to claim 9 or 10, wherein the collection vessel has a handle. 前記ロッド部材は、
前記原子炉圧力容器の上端部側から前記内底部側にわたって延びるロッド本体部と、
前記ロッド本体部の下端側において前記ロッド本体部から前記原子炉圧力容器の内周面側に向かって放射状に延び、前記内周面側の端部において前記内周面に設けられた構造物に係合して前記原子炉圧力容器の吊り上げを可能にする複数のアーム部と、を有し、
前記収集容器は、前記周方向において隣り合う前記アーム部同士の間において当該アーム部から垂れ下がるように前記ロッド部材に保持される、請求項９〜１１のいずれか１項に記載の原子炉圧力容器解体装置。 The rod member
A rod body extending from the upper end side of the reactor pressure vessel to the inner bottom side,
At the lower end side of the rod body portion, the structure extends radially from the rod body portion toward the inner peripheral surface side of the reactor pressure vessel, and at the end portion on the inner peripheral surface side, the structure is provided on the inner peripheral surface. It has a plurality of arm portions, which are engaged to enable the lifting of the reactor pressure vessel.
The reactor pressure vessel according to any one of claims 9 to 11, wherein the collection vessel is held by the rod member so as to hang down from the arm portions adjacent to each other in the circumferential direction. Dismantling device. 前記アーム部は、前記収集容器の開口部よりも上方に突出した凸部を有し、前記凸部は、前記収集容器の開口部から前記周方向に離れるのにしたがって上方に向かって傾斜した傾斜面が設けられている、請求項１２に記載の原子炉圧力容器解体装置。 The arm portion has a convex portion that protrudes upward from the opening of the collection container, and the convex portion is inclined upward as the distance from the opening of the collection container increases in the circumferential direction. The reactor pressure vessel dismantling device according to claim 12, which is provided with a surface. 前記切断装置は、前記原子炉圧力容器を熱切断する請求項１〜１３のいずれか１項に記載の原子炉圧力容器解体装置。 The reactor pressure vessel dismantling device according to any one of claims 1 to 13, wherein the cutting device thermally cuts the reactor pressure vessel. 前記ロッド部材を吊り上げるクレーンを更に備える請求項１〜１４のいずれか１項に記載の原子炉圧力容器解体装置。 The reactor pressure vessel dismantling device according to any one of claims 1 to 14, further comprising a crane for lifting the rod member. 原子炉圧力容器を吊り上げる工程と、
前記原子炉圧力容器の上端部を上方から覆う上壁部および部分的に前記上壁部を開放する扉部を有する蓋部材によって前記上端部を覆いながら前記吊り上げられた原子炉圧力容器の上端部を切断する工程と、
前記上端部の切断片を取り出す工程と、を備え、
前記上端部を切断する工程は、
前記扉部によって前記上壁部が閉鎖された状態において、前記上端部に、上下方向に沿った直線状の切り込みと、前記上下方向および前記原子炉圧力容器の周方向に沿ったＬ字状の切り込みであって前記直線状の切り込みの下端近傍に至るＬ字状の切り込みとを形成することと、
前記直線状の切り込みおよび前記Ｌ字状の切り込みを形成した後に、前記扉部によって前記上壁部が開放された状態において、前記直線状の切り込みと前記Ｌ字状の切り込みとが繋がるように前記周方向に沿った仕上げ切断を行って前記上端部から前記切断片を切り離すことを含み、
前記切断片を取り出す工程は、
前記上壁部の開放によって形成された開口部を通して前記蓋部材の外部に前記切断片を取り出すことを含む、原子炉圧力容器解体方法。 The process of lifting the reactor pressure vessel and
The upper end of the reactor pressure vessel lifted while covering the upper end with a lid member having an upper wall portion that covers the upper end portion of the reactor pressure vessel from above and a door portion that partially opens the upper wall portion. And the process of cutting
The step of taking out the cut piece at the upper end portion is provided.
The step of cutting the upper end portion is
In a state where the upper wall portion is closed by the door portion, a linear notch along the vertical direction and an L-shape along the vertical direction and the circumferential direction of the reactor pressure vessel are formed at the upper end portion. Forming an L-shaped notch that extends to the vicinity of the lower end of the linear notch, and
After forming the linear notch and the L-shaped notch, the linear notch and the L-shaped notch are connected so that the straight notch and the L-shaped notch are connected in a state where the upper wall portion is opened by the door portion. Including making a finish cut along the circumferential direction to separate the cut piece from the upper end.
The step of taking out the cut piece is
A method for disassembling a reactor pressure vessel, which comprises taking out the cut pieces to the outside of the lid member through an opening formed by opening the upper wall portion.
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