Nondestructive testing of moisture separator reheater tubing system using Hall sensor array (original) (raw)

2017, Nondestructive Testing and Evaluation

Do c and Jinyi Lee a,b a research center for it-based real time Ndt, chosun university, gwangju, south of Korea; b department of control, instrumentation and robot engineering, chosun university, gwangju, south of Korea; c KePco Plant service and engineering co., ltd, Busan, south of Korea ABSTRACT This paper presents a nondestructive testing system for inspecting the moisture separator reheater (MSR) tubing system in a nuclear power plant. The technique is based on partial saturation eddy current testing in which a Hall sensor array is used to measure the radial component of the electromagnetic field distributed in the tubes. A finned MRS tube of ferritic stainless steel (SS439) with artificial, flatbottom hole-type defects was used in the experiments. The results show that the proposed system has potential applications in the MSR system or ferromagnetic material tubes in general, which could detect the artificial defects of about 20% of the wall thickness (0.24 mm). Furthermore, the defect volume could be quantitatively evaluated.