Abstract
The collecting device attached to the abrasive water jet for decommissioning of nuclear power plant is studied to remove water, abrasives and chips. For decommissioning the concrete and steel structure of nuclear power plant, the experiments include concrete milling, steel plate cutting, and steel tube cutting. Two grades of compressive strength of the concrete, 35MPa and 14MPa, are chosen in the experiment and the effects of shroud shape, shroud size, tube inside diameter, tube length, vessel volume, and power of vacuum pump on the waste collecting efficiency are investigated. 304L stainless steel and A572 alloy steel are chosen to observe the performance of collecting device and to estimate the life of the catcher. 304L stainless steel tube same as in-core guide tube inside the reactor is used for tube cutting, and a shroud wrapping the steel tube is designed. The performance of this shroud in the experiment of circle and line cutting is evaluated. The obtained results provide a reference for the prototype and process development in decommission technology.Keywords：Nuclear Power Plant, Decommission, Waste Collection, Abrasive Waterjet.