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http://dx.doi.org/10.20466/KPVP.2019.15.1.062

A Study on the Surface Roughness Behavior of Reactor Vessel Stud Holes in APR1400 Nuclear Power Plants  

Kim, Dong Il (전남대 기계공학과)
Kim, Chang Hun (한전KPS 주식회사)
Moon, Young Jun (한전KPS 주식회사)
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.15, no.1, 2019 , pp. 62-70 More about this Journal
Abstract
The APR1400 reactor may be operated for a long time under high temperature and pressure conditions, causing damage to the stud holes and causing stud bolts and holes to stick. The present practice is to manually remove the anti-sticking agent and foreign matter remaining in the APR1400 reactor stud hole and to visually check the surface condition of the thread to check the damage status of the threads. In the case of the APR1400 reactor stud holes, manually cleaning the threads increases the risk of radiation exposure and operator's fatigue. To avoid this, the autonomous mobile robot is used to automatically clean the reactor stud holes. The purpose of this study is to optimize the cleaning performance of the mobile robot by looking at the behavior of the surface roughness of the stud surface cleaned by the brush attached to the mobile robot due to changes in brush material, thickness of wire, and rotation speed. A microscopic approach to the surface roughness of the flank is needed to investigate the effects of the newly proposed brush of the autonomous mobile robot on the thread holes. According to this experiment, it is reasonable to use STS brush rather than Carbon one. Optimal operating conditions are derived and the safety of APR1400 reactor stud holes maintenance can be improved.
Keywords
Reactor stud hole; STS brush; Flank; Surface roughness;
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  • Reference
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