DECONTAMINATION IMPLEMENTATION METHOD AND DECONTAMINATION IMPLEMENTATION APPARATUS

To provide a decontamination implementation technique capable of improving decontamination effect on chemical decontamination of a reactor pressure vessel.SOLUTION: A decontamination implementation method includes the steps of: connecting a temporary system 4 to upper facilities 12, 15, and 27 provided above at least the vertical center of a reactor pressure vessel 2 and lower facilities 28, 29 and 30 provided below the upper facilities 12, 15 and 27; circulating a decontamination liquid in a circulation path structured with the reactor pressure vessel 2 and temporary system 4 by a temporary pump 25 provided for the temporary system 4; and using the upper facilities 12, 15 and 27 and lower facilities 28, 29 and 30 to put the decontamination liquid in and out of the reactor pressure vessel 2, and changing modes of a flow in the reactor pressure vessel 2.SELECTED DRAWING: Figure 12 【課題】原子炉圧力容器の化学除染の除染効果を向上させることができる除染実施技術を提供する。【解決手段】除染実施方法は、原子炉圧力容器２の少なくとも上下方向の中央よりも上方に設けられた上部設備１２，１５，２７と上部設備１２，１５，２７よりも下方に設けられた下部設備２８，２９，３０に仮設系統４を接続するステップと、仮設系統４に設けられた仮設ポンプ２５により、原子炉圧力容器２と仮設系統４とで構築される循環経路に除染液を循環させるステップと、上部設備１２，１５，２７と下部設備２８，２９，３０を用いて原子炉圧力容器２の内部に除染液を出し入れして原子炉圧力容器２の内部のフローの態様を切り換えるステップとを含む。【選択図】図１２