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Proceedings Paper

A measurement of a control rod drop using an LVDT
Author(s): Myoung-Hwan Choi; Ji-Ho Kim; Hyung Huh; Je-Yong Yu; Dong-Seong Sohn
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Paper Abstract

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.

Paper Details

Date Published: 15 April 2010
PDF: 6 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75225O (15 April 2010); doi: 10.1117/12.851306
Show Author Affiliations
Myoung-Hwan Choi, Korea Atomic Energy Research Institute (Korea, Republic of)
Ji-Ho Kim, Korea Atomic Energy Research Institute (Korea, Republic of)
Hyung Huh, Korea Atomic Energy Research Institute (Korea, Republic of)
Je-Yong Yu, Korea Atomic Energy Research Institute (Korea, Republic of)
Dong-Seong Sohn, Korea Atomic Energy Research Institute (Korea, Republic of)


Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics

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