The design & implementation of three-dimensional analysis and evaluation system of sludge in nuclear power evaporator

During the running of nuclear power plant, corrosion products and impurities will be migrated from the secondary circuit to the steam generator. Some of them will stay inside the steam generator as sludge and they will gradually deposit on tube plate, the upper part of support plate, surface of tubes and the gap between the support plate and tubes. These sludge will be deposited on the surface of heat transfer tubes or on the tube plate, leading to the serious defects such as the corrosion inside steam generator and posing a major threat to the safe operation of nuclear power unit. In order to ensure the safe and stable running of nuclear power unit, it becomes particularly important to do evaluation on the deposition conditions of sludge in the certain area of evaporator. This paper adopts the non-destructive testing method based on eddy current and three-dimensional modeling & rendering engine of Unity3D to have a three-dimensional display on the deposition and distribution of sludge in multiple-pile evaporator. This clearly and effectively exhibits the sedimentation situation of sludge in evaporator, effectively improves the evaluation accuracy and provides an important basis for the subsequent sludge cleaning work.