• Title/Summary/Keyword: 제어봉 구동 장치

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Drop and Damping Characteristics of the CEDM for the Integral Reactor (일체형원자로 제어봉구동장치의 낙하 및 완충특성)

  • Choi, M.H.;Kim, J.H.;Huh, H.;Yu, J.Y.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.7
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    • pp.658-664
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    • 2010

  • A control element drive mechanism(CEDM) is a reactor regulating system, which inserts, withdraws or maintains a control rod containing a neutron absorbing material within a reactor core to control the reactivity of the core. The ball-screw type CEDM for the integral reactor has a spring-damper system to reduce the impact force due to the scram of the CEDM. This paper describes the experimental results to obtain the drop and damping characteristics of the CEDM. The drop tests are performed by using a drop test rig and a facility. A drop time and a displacement after an impact are measured using a LVDT. The influences of the rod weight, the drop height and the flow area of hydraulic damper on the drop and damping behavior are also estimated on the basis of test results. The drop time of the control element is within 4.5s to meet the design requirement, and the maximum displacement is measured as 15.6 mm. It is also found that the damping system using a spring-hydraulic damper plays a good damper role in the CEDM.

  • https://doi.org/10.5050/KSNVE.2010.20.7.658 인용 PDF KSCI

Improving Stability of Motor Generator Set of the Power Supply System for CEDM in Korean Standard Nuclear Power Plants (한국표준형 원전 제어봉구동장치 전원공급계통의 전동발전기 세트 안정성 개선)

  • Choi, Il Young;Kim, Jin Weon
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.12 no.1
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    • pp.49-55
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    • 2016

  • This paper analyzed a root cause of abnormality in the temperature and vibration at generator-side bearing of motor generator set (MG Set), which is a power supply system to control element drive mechanism (CEDM) of nuclear power plants (NPPs), and modified the design of roller-type and sealing method to improve the abnormalities. From the inspection of MG Set and analysis of temperature variation during service, it was found that the abnormal temperature transition was basically associated with original design of generator-side bearing, whose roller was axially restrained by inner race, and that the abnormal vibration level was caused by inserting small chips of cage and V-ring, which were generated due to the abnormal temperature transition at roller bearing. Type of bearing and sealing method were modified based on these analyses. The temperature and vibration level measured at roller bearing showed that the modifications clearly improved the operational stability of MG Set.

  • https://doi.org/10.20466/KPVP.2016.12.1.049 인용 PDF KSCI