DECOMMISSIONING METHOD FOR BOILING WATER REACTOR AND DEMOLITION DEVICE

To provide a decommissioning method for boiling water reactor capable of realizing efficiency of a decommissioning work of a reactor pressure vessel to shorten the number of processes, the reactor pressure vessel having a metal thermal insulation material composed of a thin plate in a narrow place, and provide a demolition device.SOLUTION: A decommissioning method for a boiling water reactor comprising a metal thermal insulation material 14 in a gap between a reactor heat shielding wall 13 and a reactor pressure vessel 15, comprises the steps of: gripping the upper ends of the reactor heat shielding wall 13, the metal thermal insulation material 14 and the reactor pressure vessel 15; and simultaneously cutting the reactor heat shielding wall 13, the metal thermal insulation material 14, and the reactor pressure vessel 15 with a wire saw 60 wound around the outer periphery of the reactor heat shielding wall 13.SELECTED DRAWING: Figure 12 【課題】狭隘な場所に薄板から構成される金属保温材を有する原子炉圧力容器の廃炉作業の効率化を図り工程数を短縮化できる沸騰水型原子炉の廃止措置工法と解体装置を提供する。【解決手段】本発明の沸騰水型原子炉の廃止措置工法は、原子炉熱遮蔽壁１３と原子炉圧力容器１５の隙間に金属保温材１４を備えた沸騰水型原子炉の廃止措置工法において、前記原子炉熱遮蔽壁１３と前記金属保温材１４と前記原子炉圧力容器１５のそれぞれ上端を把持する工程と、前記原子炉熱遮蔽壁１３の外周に巻き付けたワイヤーソー６０で前記原子炉熱遮蔽壁１３と前記金属保温材１４と前記原子炉圧力容器１５を同時切断する工程と、を有することを特徴としている。【選択図】 図１２