Dr. Myoung-Hwan Choi Profile

Dr. Myoung-Hwan Choi

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Proceedings Article | 15 April 2010 Paper

A measurement of a control rod drop using an LVDT

Myoung-Hwan Choi, Ji-Ho Kim, Hyung Huh, Je-Yong Yu, Dong-Seong Sohn

Proceedings Volume 7522, 75225O (2010) https://doi.org/10.1117/12.851306

KEYWORDS: Control systems, Motion measurement, Magnetism, Digital cameras, Image analysis, Sensors, Imaging systems, Boron, Digital imaging, Transformers

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A control element drive mechanism is a reactor regulating system, which is to insert, withdraw, or maintain a control rod containing neutron-absorbing material within a reactor core to control the reactivity of the reactor. The ball-screw type CEDM for the small and medium research reactor has a spring-hydraulic damper to reduce the impact force due to the free drop of the CEDM. This paper describes the experimental results to obtain the drop characteristics of the CEDM. The tests are performed by using a full-scale structure except the control element assembly, and a drop time and displacement after an impact are measured by using an LVDT. The influences of the rod weight and the drop height on the drop behavior are also estimated on the basis of test results. In case of the longest stroke, the drop time of the control rod is within 4.5 seconds to meet the design requirement. The behavior after the impact shows a general damping motion of the spring-damper system, and the maximum displacement is measured as 15.6 mm.

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