CARRYING-OUT METHOD FOR IN-REACTOR STRUCTURE OF NUCLEAR POWER PLANT

• Main Authors: MUTO HIROSHI, SASAKI HIROSHI, TOTSUKA FUMIO, KUROSAWA KOICHI, TSUKIYAMA TOSHINAO, USAMI YASUHIRO, MOTOKI TOMOHIKO, YASUDA KENICHI, HIRANO KATSUHIKO, SONOBE MASAYOSHI
• Format: Patent
• Language: English; Japanese
• Published: 05.10.2017
• Subjects: DECONTAMINATION ARRANGEMENTS THEREFOR; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PHYSICS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL

PROBLEM TO BE SOLVED: To provide a carrying-out method for an in-reactor structure of a nuclear power plant that can prevent a radioactive substance from being discharged to an outside environment when the in-reactor structure is transported from a reactor vessel.SOLUTION: A work house 16A is installed right above an RPV 2 and on an operation floor of a nuclear reactor building in which the RPV 2 is installed. A cutting demolition device 88 and a grapple device 93 for demolition are installed in the work house 16A, and with a cutter 94A of the cutting demolition device 88, a steam dryer 7 gripped by the grapple device 93 for demolition is cut in the RPV 2. A cut piece 7A of the steam dryer 7 is gripped with a grapple 94C suspended from a trolley 20A, lifted into the work house 16A, and stored in a conveyance container 76A in the work house 16A. The work house 16A can prevent a radioactive substance in the RPV 2 from being discharged to an outside environment as the cut piece 7A is carried.SELECTED DRAWING: Figure 26 【課題】炉内構造物の原子炉容器からの移送の際に放射性物質が外部環境に排出されることを防止できる原子力プラントにおける炉内構造物の搬出方法を提供する。【解決手段】作業ハウス１６Ａを、ＲＰＶ２の真上でＲＰＶ２を内部に設置した原子炉建屋の運転床上に設置する。切断解体装置８８及び解体用グラップル装置９３が作業ハウス１６Ａ内に設置され、切断解体装置８８のカッター９４Ａにより、ＲＰＶ２内で解体用グラップル装置９３により把持された蒸気乾燥器７を切断する。蒸気乾燥器７の切断片７Ａが、トロリ２０Ａから懸垂されたグラップル９４Ｃに把持され、作業ハウス１６Ａ内まで吊り上げられ、作業ハウス１６Ａ内の搬送容器７６Ａ内に収納される。この切断片７Ａの移送に伴うＲＰＶ２内の放射性物質の外部環境への排出が作業ハウス１６Ａによって防止できる。【選択図】図２６