JP3565371B2 - How to replace the reactor pressure vessel - Google Patents

How to replace the reactor pressure vessel Download PDF

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JP3565371B2
JP3565371B2 JP08900995A JP8900995A JP3565371B2 JP 3565371 B2 JP3565371 B2 JP 3565371B2 JP 08900995 A JP08900995 A JP 08900995A JP 8900995 A JP8900995 A JP 8900995A JP 3565371 B2 JP3565371 B2 JP 3565371B2
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Prior art keywords
pressure vessel
reactor pressure
shielding wall
reactor
vessel
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JPH08285981A (en
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博美 藤澤
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石川島播磨重工業株式会社
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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
    • 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

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Description

【０００１】
【産業上の利用分野】
本発明は、既存の原子炉圧力容器を新規なものに取り替えるために、その原子炉圧力容器を撤去する際、特に、原子炉圧力容器の周辺の構造物や機器に与える影響を少なくすることのできる原子炉圧力容器の取り替え方法に関するものである。
【０００２】
【従来の技術】
原子力発電所の原子炉圧力容器は、所定の耐用年数を経過すると原子炉圧力容器の取り替えが必要となるが、この取り替えを行なった事例はない。
【０００３】
【発明が解決しようとする課題】
ところで、原子炉圧力容器が所定の耐用年数を経過したのちに、原子炉圧力容器を撤去して新規な原子炉圧力容器に取り替えることになるが、その際、原子炉圧力容器の周辺の構造物を、できるだけそのまま残すようにして撤去できれば撤去範囲も少なくて済むことになる。また、原子炉圧力容器には各種の配管が接続されているが、その配管も原子炉圧力容器の周囲に狭い隙間を隔てて形成されている遮蔽壁を貫通して配設されていることから、原子炉圧力容器の撤去作業から新規な原子炉圧力容器の据え付け作業にいたる工事の簡素化、工期の短縮化を考慮すると、原子炉圧力容器の周囲の構造物や機器に影響を与えないことが望まれる。
【０００４】
本発明は、上記問題点に鑑み案出されたもので、原子炉圧力容器の撤去作業から新規な原子炉圧力容器の据え付け作業にいたる工事の簡素化、工期の短縮化を達成することのできる原子炉圧力容器の取り替え方法を提供することを目的とするものである。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、原子炉格納容器内の原子炉圧力容器と、それを囲繞する遮蔽壁の取り替え方法において、前記原子炉圧力容器のノズルを切断する工程と、該原子炉圧力容器を原子炉格納容器外に搬出する工程と、前記遮蔽壁を下部のノズルが貫通する複数の開口部を通る同一高さの、または、段差のある水平面で切断して上下に２分割する工程と、該分割された上部遮蔽壁を格納容器外に搬出する工程と、予め切断面が垂直になるような複数個に分割した上部遮蔽壁を、原子炉格納容器内に搬入し、その原子炉格納容器の内側であって、原子炉圧力容器を搬入する際障害とならない位置に仮り置きする工程と、新規な原子炉圧力容器を原子炉格納容器内に搬入して据え付ける工程と、前記水平切断面より下方の下部遮蔽壁の上に、前記仮り置きした複数個の上部遮蔽壁を載置する工程と、該複数個の上部遮蔽壁同志および上部遮蔽壁と下部遮蔽壁を溶接により一体に固定して据え付ける工程と、前記新規な原子炉圧力容器のノズルと配管を連結する工程とを有するものである。また、 上部遮蔽壁と下部遮蔽壁とを接合する際にそれらの間にスペーサーを介在させてもよい。
【０００６】
【作用】
上述した取り替え方法によれば、新規な原子炉圧力容器のノズルを付けたままで搬入することができるので取り替えが容易で、かつ、工期を短縮することができる。
【０００７】
【実施例】
以下、本発明の好ましい実施例を図面に基づいて説明する。図１は原子炉圧力容器の格納状態を示す正面断面図、図２は原子炉圧力容器の遮蔽壁および原子炉圧力容器のノズルを切断した状態を示す正面断面図、図３は原子炉圧力容器を原子炉格納容器外に搬出している状態を示す正面断面図、図４は原子炉圧力容器を原子炉格納容器内に据え付けようとしている状態を示す正面断面図、図５は下部遮蔽壁上端の切断面の一部にスペ−サーを固定した状態を示す正面展開図、図６は図５のＡ−Ａ矢視図である。
【０００８】
図において、１は原子炉圧力容器で、その頂部に原子炉圧力容器上蓋３を有し、スタッドボルト１０により締結して一体となっている。また、その下方部に設けられた支持部材９を介してペデスタル７の上にボルト１８により固定され据え付けられている。しかも、この原子炉圧力容器１には、各種のノズル２に配管４がそれぞれ連結されている。原子炉圧力容器１の外側には、それを囲繞するように遮蔽壁５が前記ペデスタル７の上に据え付けられている。この遮蔽壁５は、外側に設けた鋼板とその内部に充填したコンクリートにより一体に構成されている。この遮蔽壁５には、ノズル２が貫通するための開口部６が設けられており、その開口部６には着脱自在な遮蔽蓋（図示せず）が配設されている。また、前記原子炉圧力容器１および遮蔽壁５の外側には、それらを包囲するように原子炉格納容器８が設けられている。さらに、その外側には原子炉建屋１５が構築されている。１１は上部遮蔽壁５ａを既設の下部遮蔽壁５ｂの切断面の上に載置し、溶接により固定するスペーサーである。１２は原子炉圧力容器１を原子炉格納容器８外に搬出したり、搬入したりする際に使用する大型ジブクレーンで、原子炉圧力容器上蓋３のフランジ３aに取り付けた吊り具１３により原子炉圧力容器１の吊り上げ吊り下げを行う。１４はその際に使用する吊りワイヤである。１６はベローズで、原子炉格納容器８に取り付けられたバルクヘッド１７と原子炉圧力容器１との間に伸縮可能に配設されている。１ｂは原子炉圧力容器１のフランジである。Ｃ１は上部遮蔽壁５ａと下部遮蔽壁５ b との切断部であり、図２では右の切断部Ｃ１は左の切断部Ｃ１より低く、図示されている。また、右の切断部Ｃ１がある開口部６を貫通するノズル２よりも下にもノズルおよびそれが貫通する開口部が図示されている。Ｃ２はノズル２の切断部である。なお、図６においてＷは上部遮蔽壁５ａおよび下部遮蔽壁５bとスペーサー１１とを固定する溶接部である。
【０００９】
次に実施例の作用を説明する。
図２において、原子炉圧力容器１を搬出するときは、まず、原子炉圧力容器１のノズル２を切断部Ｃ２で切断する。次に、該原子炉圧力容器１を原子炉格納容器８外に搬出するときは、原子炉圧力容器上蓋３のフランジ３ａに吊り具１３を取り付けた状態で、ベローズ１６を切断し、かつ、原子炉圧力容器１を固定しているボルト１８を取り外し、図３に示すように大型ジブクレーン１２によって吊り上げ、収納容器Ａに収納して密閉状態のまま原子炉格納容器８外に搬出する。続いて遮蔽壁５を搬出するときは、遮蔽壁５の下部のノズル２が貫通する複数の開口部６を通る同一高さの、または、段差のある水平面で、例えば、高圧水カッターなどにより切断部Ｃ１で切断し、上部遮蔽壁５ａと下部遮蔽壁５ｂとに２分割する。この分割した上方の上部遮蔽壁５ａに吊り具（図示せず）を取り付け、前記原子炉圧力容器１を搬出したときと同様に、大型ジブクレーン１２で吊り上げ原子炉格納容器８外に搬出する。
【００１０】
一方、新規な原子炉圧力容器１ａを原子炉格納容器８内に搬入するときは、図４に示すように、まず、予め地上で、複数個に分割して製作した上部遮蔽壁５ａを、大型ジブクレーン１２で吊り上げて原子炉格納容器８内に搬入し、原子炉格納容器８の内側であって、新規な原子炉圧力容器１ａを搬入する際障害とならない位置、すなわち、新規な原子炉圧力容器１ａのノズル２の先端より外側に仮り置きする。引き続き、工場等で製作した新規な原子炉圧力容器１ａを、該原子炉圧力容器１ａのフランジ１ｂに取り付けた吊り具１３によって大型ジブクレーン１２で吊り上げて原子炉格納容器８内に搬入し、ペデスタル７の上に支持部材９を介しボルト１８で固定して据え付ける。新規な原子炉圧力容器１ａの据え付け完了後、前記切断した既設の下部遮蔽壁５ｂの上に、前記仮り置きした複数個の上部遮蔽壁５ａを移動し、複数個の上部遮蔽壁５ａ同志および上部遮蔽壁５ａと下部遮蔽壁５ｂを溶接により一体に固定して据え付ける。さらに、その据え付け後、新規な圧力容器１ａのノズル２と配管４を溶接にて接合する。なお、上部遮蔽壁５ａと下部遮蔽壁５ｂとを接合する際にはスペーサー１１を使用すると多少の芯ずれがあっても接合が容易である。
【００１１】
【発明の効果】
以上説明したように、本発明によれば、原子炉圧力容器を取り替える際、まず、原子炉圧力容器を搬出するときは、原子炉圧力容器のノズルを切断して搬出し、遮蔽壁を下部のノズルが貫通する複数の開口部を通る同一高さの、または、段差のある水平面で切断して上下に２分割し、下部遮蔽壁は既設のまま据え置き、上部遮蔽壁のみを原子炉格納容器外に搬出する。次に、新規な原子炉圧力容器を搬入するときは、予め複数個に分割した遮蔽壁を原子炉格納容器内に搬入して、その内側に仮り置きする。続いて原子炉格納容器内に新規な原子炉圧力容器を搬入して据え付けた後、前記既設のまま据え置いた下部遮蔽壁の上に、前記仮り置きした複数個の上部遮蔽壁を移動し、それら上部遮蔽壁同志および上部遮蔽壁と下部遮蔽壁を溶接により一体に固定し、さらに新規な原子炉圧力容器のノズルと配管とを接続するようにしているので、原子炉圧力容器の取り替え作業が容易で、しかも工期を短縮することができるなど、優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明の原子炉圧力容器の格納状態を示す正面断面図。
【図２】原子炉圧力容器の遮蔽壁および配管を切断した状態を示す正面断面図。
【図３】原子炉圧力容器を原子炉格納容器外に搬出しようとしている状態を示す正面断面図。
【図４】原子炉圧力容器を原子炉格納容器内に据え付けようとしている状態を示す正面断面図。
【図５】下部遮蔽壁上端の切断面の一部にスペーサーを固定した状態を示す正面展開図。
【図６】図５のＡ−Ａ矢視図。
【符号の説明】
１ 原子炉圧力容器
１ａ 新規な原子炉圧力容器
１ｂ 原子炉圧力容器のフランジ
２ ノズル
３ 原子炉圧力容器上蓋
３ａ 原子炉圧力容器上蓋のフランジ
４ 配管
５ 遮蔽壁
５ａ 上部遮蔽壁
５ｂ 下部遮蔽壁
６ 開口部
７ ペデスタル
８ 原子炉格納容器
９ 支持部材
１０ スタットボルト
１１ スペーサー
１２ ジブクレーン
１３ 吊り具
１４ ワイヤ
１５ 原子炉建屋
１６ ベローズ
１７ バルクヘッド
１８ ボルト
Ａ 収納容器[0001]
[Industrial applications]
The present invention is intended to reduce the influence on the structure and equipment around the reactor pressure vessel, especially when removing the existing reactor pressure vessel to replace it with a new one. The present invention relates to a method for replacing a reactor pressure vessel that can be performed.
[0002]
[Prior art]
A reactor pressure vessel of a nuclear power plant requires replacement of the reactor pressure vessel after a predetermined service life, but there has been no case of such replacement.
[0003]
[Problems to be solved by the invention]
By the way, after the reactor pressure vessel has reached the specified service life, the reactor pressure vessel is removed and replaced with a new reactor pressure vessel. Can be removed by leaving as much as possible, so that the removal range can be reduced. In addition, various pipes are connected to the reactor pressure vessel, but the pipes are also arranged through the shielding wall formed with a narrow gap around the reactor pressure vessel. Considering the simplification of the work from removal of the reactor pressure vessel to installation of a new reactor pressure vessel and shortening the construction period, the structure and equipment around the reactor pressure vessel should not be affected. Is desired.
[0004]
The present invention has been devised in view of the above-described problems, and can achieve simplification of work from removal work of a reactor pressure vessel to installation work of a new reactor pressure vessel, and shortening of a construction period. It is an object of the present invention to provide a method for replacing a reactor pressure vessel.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in a method of replacing a reactor pressure vessel in a reactor containment vessel and a shielding wall surrounding the reactor pressure vessel, a step of cutting a nozzle of the reactor pressure vessel, Carrying out the furnace outside the containment vessel, cutting the shielding wall at the same height passing through a plurality of openings through which the lower nozzle penetrates , or a horizontal surface having a step, and dividing the shielding wall into two vertically. The step of carrying out the divided upper shielding wall out of the containment vessel, and the step of carrying out the upper shielding wall divided into a plurality of sections so that the cut surface becomes vertical in advance into the reactor containment vessel, and On the inside, a step of temporarily placing the reactor pressure vessel at a position where it does not become an obstacle when loading the vessel, a step of loading and installing a new reactor pressure vessel into the reactor containment vessel, and a step below the horizontal cut plane. On the lower shielding wall of A step of mounting a plurality of temporarily placed upper shielding walls, a step of integrally fixing the plurality of upper shielding walls and the upper and lower shielding walls by welding, and installing the novel nuclear reactor; Connecting the nozzle of the pressure vessel and the pipe. When joining the upper shielding wall and the lower shielding wall, a spacer may be interposed between them .
[0006]
[Action]
According to the above-described replacement method, since the new reactor pressure vessel can be carried in with the nozzle attached, the replacement is easy and the construction period can be shortened.
[0007]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front cross-sectional view showing a storage state of a reactor pressure vessel, FIG. 2 is a front cross-sectional view showing a state where a shielding wall of the reactor pressure vessel and a nozzle of the reactor pressure vessel are cut, and FIG. 3 is a reactor pressure vessel. FIG. 4 is a front sectional view showing a state in which the reactor is being carried out of the containment vessel, FIG. 4 is a front sectional view showing a state in which the reactor pressure vessel is about to be installed in the containment vessel, and FIG. 6 is a front development view showing a state where a spacer is fixed to a part of the cut surface of FIG.
[0008]
In the drawing, reference numeral 1 denotes a reactor pressure vessel, which has a reactor pressure vessel upper lid 3 on the top thereof, and is fastened by stud bolts 10 to be integrated. Further, it is fixed and installed on the pedestal 7 by a bolt 18 via a support member 9 provided at a lower portion thereof. Further, in the reactor pressure vessel 1, pipes 4 are connected to various nozzles 2, respectively. Outside the reactor pressure vessel 1, a shielding wall 5 is mounted on the pedestal 7 so as to surround it. The shielding wall 5 is integrally formed of a steel plate provided on the outside and concrete filled therein. The shielding wall 5 is provided with an opening 6 through which the nozzle 2 penetrates, and the opening 6 is provided with a detachable shielding lid (not shown). A containment vessel 8 is provided outside the reactor pressure vessel 1 and the shielding wall 5 so as to surround them. Further, a reactor building 15 is constructed outside the reactor building. Reference numeral 11 denotes a spacer for placing the upper shielding wall 5a on the cut surface of the existing lower shielding wall 5b and fixing the spacer by welding. Reference numeral 12 denotes a large-sized jib crane used when carrying out or carrying in the reactor pressure vessel 1 out of the containment vessel 8, and the reactor pressure is controlled by a hanger 13 attached to the flange 3a of the reactor pressure vessel upper lid 3. The container 1 is lifted and suspended. Reference numeral 14 denotes a hanging wire used at that time. Reference numeral 16 denotes a bellows, which is provided between the bulkhead 17 attached to the containment vessel 8 and the reactor pressure vessel 1 so as to be able to expand and contract. 1b is a flange of the reactor pressure vessel 1. C1 is the cut portion of the upper shielding wall 5a and the lower shielding wall 5 b, Fig. 2 the right of the cut C1 is lower than the left of the cut C1, is shown. In addition, the nozzle and the opening through which the nozzle penetrates are shown below the nozzle 2 that passes through the opening 6 where the right cut portion C1 is located. C2 is a cutting portion of the nozzle 2. In FIG. 6, W denotes a welded portion for fixing the spacer 11 to the upper shielding wall 5a and the lower shielding wall 5b.
[0009]
Next, the operation of the embodiment will be described.
In FIG. 2, when carrying out the reactor pressure vessel 1, first, the nozzle 2 of the reactor pressure vessel 1 is cut at the cutting section C2. Next, when the reactor pressure vessel 1 is carried out of the containment vessel 8, the bellows 16 is cut off while the hanging member 13 is attached to the flange 3 a of the reactor pressure vessel upper lid 3, and The bolt 18 fixing the reactor pressure vessel 1 is removed, lifted up by the large jib crane 12 as shown in FIG. 3, stored in the storage vessel A, and carried out of the reactor containment vessel 8 in a sealed state. Subsequently, when the shielding wall 5 is carried out, the shielding wall 5 is cut by a high-pressure water cutter or the like on a horizontal surface having the same height or a step through a plurality of openings 6 through which the nozzle 2 below the shielding wall 5 penetrates. It is cut at the portion C1 and is divided into an upper shielding wall 5a and a lower shielding wall 5b. A hanging tool (not shown) is attached to the upper shield wall 5a divided above and lifted by the large jib crane 12 and carried out of the containment vessel 8 in the same manner as when the reactor pressure vessel 1 is carried out.
[0010]
On the other hand, when the new reactor pressure vessel 1a is to be carried into the reactor containment vessel 8, as shown in FIG. It is lifted by the jib crane 12 and carried into the reactor containment vessel 8, and is located inside the reactor containment vessel 8 and does not become an obstacle when carrying in the new reactor pressure vessel 1a, that is, a new reactor pressure vessel. It is temporarily placed outside the tip of the nozzle 2a. Subsequently, a new reactor pressure vessel 1a manufactured at a factory or the like is lifted by a large jib crane 12 by a hanging tool 13 attached to a flange 1b of the reactor pressure vessel 1a, and is carried into the reactor containment vessel 8, where the pedestal 7 It is fixed and installed with a bolt 18 via a support member 9 on the above. After the installation of the new reactor pressure vessel 1a is completed, the plurality of provisionally placed upper shielding walls 5a are moved onto the cut existing lower shielding wall 5b, and the plurality of upper shielding walls 5a are connected to each other. The shielding wall 5a and the lower shielding wall 5b are integrally fixed and installed by welding. Further, after the installation, the nozzle 2 of the new pressure vessel 1a and the pipe 4 are joined by welding. When the upper shielding wall 5a and the lower shielding wall 5b are joined, use of the spacer 11 facilitates the joining even if there is some misalignment.
[0011]
【The invention's effect】
As described above, according to the present invention, when replacing the reactor pressure vessel, first, when unloading the reactor pressure vessel, cut the nozzle of the reactor pressure vessel and unload it, and place the shielding wall at the lower part. Cut at the same height or through a horizontal plane with a step that passes through multiple openings through which nozzles penetrate, and divide it into upper and lower parts, leave the lower shielding wall as it is, and leave only the upper shielding wall outside the reactor containment vessel To be carried out. Next, when a new reactor pressure vessel is carried in, the shielding wall divided in advance into a plurality of pieces is carried into the reactor containment vessel and temporarily stored inside the containment wall. Subsequently, after loading and installing a new reactor pressure vessel into the reactor containment vessel, the plurality of provisionally placed upper shield walls are moved onto the lower shield wall which has been left as it is, and The upper shield wall and the upper shield wall and the lower shield wall are fixed together by welding, and the nozzle and piping of the new reactor pressure vessel are connected, making it easy to replace the reactor pressure vessel. In addition, it has excellent effects such as shortening the construction period.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a storage state of a reactor pressure vessel of the present invention.
FIG. 2 is a front sectional view showing a state where a shielding wall and piping of the reactor pressure vessel are cut.
FIG. 3 is a front cross-sectional view showing a state in which the reactor pressure vessel is about to be carried out of the containment vessel.
FIG. 4 is a front sectional view showing a state where the reactor pressure vessel is about to be installed in the reactor containment vessel.
FIG. 5 is a front development view showing a state in which a spacer is fixed to a part of a cut surface at an upper end of a lower shielding wall.
FIG. 6 is a view taken in the direction of arrows AA in FIG. 5;
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Reactor pressure vessel 1a New reactor pressure vessel 1b Reactor pressure vessel flange 2 Nozzle 3 Reactor pressure vessel top lid 3a Reactor pressure vessel top lid flange 4 Pipe 5 Shielding wall 5a Upper shielding wall 5b Lower shielding wall 6 Opening Part 7 Pedestal 8 Reactor containment vessel 9 Support member 10 Stat bolt 11 Spacer 12 Jib crane 13 Hanging tool 14 Wire 15 Reactor building 16 Bellows 17 Bulkhead 18 Bolt A Storage vessel

Claims (2)

原子炉格納容器内の原子炉圧力容器と、それを囲繞する遮蔽壁の取り替え方法において、前記原子炉圧力容器のノズルを切断する工程と、該原子炉圧力容器を原子炉格納容器外に搬出する工程と、前記遮蔽壁を下部のノズルが貫通する複数の開口部を通る同一高さの、または、段差のある水平面で切断して上下に２分割する工程と、該分割された上部遮蔽壁を格納容器外に搬出する工程と、予め上記遮蔽壁の中心軸から放射状に複数個に分割した上部遮蔽壁を、原子炉格納容器内に搬入し、その原子炉格納容器の内側であって、原子炉圧力容器を搬入する際障害とならない位置に仮り置きする工程と、新規な原子炉圧力容器を原子炉格納容器内に搬入して据え付ける工程と、前記水平切断面より下方の下部遮蔽壁の上に、前記仮り置きした複数個の上部遮蔽壁を載置する工程と、該複数個の上部遮蔽壁同志および上部遮蔽壁と下部遮蔽壁とを溶接により一体に固定して据え付ける工程と、前記新規な原子炉圧力容器のノズルと配管を連結する工程とを有することを特徴とする原子炉圧力容器の取り替え方法。In a method for replacing a reactor pressure vessel in a reactor containment vessel and a shielding wall surrounding the reactor pressure vessel, a step of cutting a nozzle of the reactor pressure vessel, and carrying the reactor pressure vessel out of the reactor containment vessel. A step of cutting the shielding wall at the same height passing through a plurality of openings through which a lower nozzle penetrates, or a horizontal plane having a step, and dividing the shielding wall into upper and lower parts, and dividing the upper shielding wall into two parts. Carrying out the step of carrying out the outside of the containment vessel, and the upper shield wall divided in advance radially from the central axis of the shield wall into a plurality of reactor containment vessels, and inside the reactor containment vessel, Temporarily placing the reactor pressure vessel in a position that does not become an obstacle when loading the reactor pressure vessel, loading the new reactor pressure vessel into the reactor containment vessel, and installing the reactor pressure vessel, and placing the new reactor pressure vessel on the lower shielding wall below the horizontal cut plane. In addition, Mounting the upper shielding walls, fixing the plurality of upper shielding walls, the upper shielding wall and the lower shielding wall together by welding, and installing the nozzles, and the nozzle of the novel reactor pressure vessel. A method for replacing a reactor pressure vessel, comprising: 上部遮蔽壁と下部遮蔽壁とを接合する際にそれらの間にスペーサーを介在させる請求項１記載の原子炉圧力容器の取り替え方法。The method for replacing a reactor pressure vessel according to claim 1, wherein a spacer is interposed between the upper shielding wall and the lower shielding wall when they are joined.
JP08900995A 1995-04-14 1995-04-14 How to replace the reactor pressure vessel Expired - Fee Related JP3565371B2 (en)

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Publication number Priority date Publication date Assignee Title
US11581101B2 (en) 2018-04-19 2023-02-14 Korea Hydro & Nuclear Power Co., Ltd. Method for decommissioning nuclear facilities

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JP3663924B2 (en) * 1998-07-28 2005-06-22 株式会社日立製作所 Method for handling reactor internal structure and apparatus used for the method
JP4276808B2 (en) * 1999-09-29 2009-06-10 日立Ｇｅニュークリア・エナジー株式会社 Equipment for carrying out nuclear power plant equipment
JP4221177B2 (en) * 2000-03-15 2009-02-12 日立Ｇｅニュークリア・エナジー株式会社 How to handle the equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11581101B2 (en) 2018-04-19 2023-02-14 Korea Hydro & Nuclear Power Co., Ltd. Method for decommissioning nuclear facilities

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