Dynamic characteristics of a perforated cylindrical shell for flow distribution in SMART

Seungho Lim; Youngin Choi; Kyungrok Ha; Kyoung Su Park; No Cheol Park; Young Pil Park; Kyeong Hoon Jeong; Jin Seok Park

doi:10.1016/j.nucengdes.2011.08.029

Dynamic characteristics of a perforated cylindrical shell for flow distribution in SMART

Seungho Lim, Youngin Choi, Kyungrok Ha, Kyoung Su Park, No Cheol Park, Young Pil Park, Kyeong Hoon Jeong, Jin Seok Park

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The System-integrated Modular Advanced ReacTor (SMART) is a small nuclear reactor under development in Korea. It is equipped with a perforated cylindrical shell, which is called a flow skirt, in the lower plenum of the reactor for uniform flow distribution and to prevent inflow of debris into the core. This perforated cylindrical shell can be excited by external forces such as seismic or pump pulsation loads. The dynamic characteristics of the perforated cylindrical shell must be identified for further dynamic analysis. This research explores the modal analysis of the scaled-down flow skirt model submerged in coolant water. For the numerical simulation, finite element analysis is carried out to extract modal characteristics of the structure considering the fluid-structure interaction and we introduce the NAVMI factor for similarity analysis. In the finite element model, the whole shape of the perforated cylindrical shell is simulated instead of using the effective material properties. In addition, a 1/12 scaled-down flow skirt is manufactured, and an experiment is designed using an exciter and waterproof accelerometers for the modal test. Due to excellent agreement between the modal test results and the finite element analysis results such as natural frequencies and mode shapes, the finite element model is validated and can be used to predict the dynamic characteristics of the real flow skirt. Moreover, the natural frequency of the real flow skirt can be calculated from the NAVMI factor and is in good agreement with the FEM result.

Original language	English
Pages (from-to)	4079-4088
Number of pages	10
Journal	Nuclear Engineering and Design
Volume	241
Issue number	10
DOIs	https://doi.org/10.1016/j.nucengdes.2011.08.029
Publication status	Published - 2011 Oct

Bibliographical note

Funding Information:
The support of the Korea Atomic Energy Research Institute (KAERI), which has designated this research as a specialization project by Yonsei University, is gratefully acknowledged. Acknowledgement is also given to the ‘Technology Verification and Acquisition of Standard Design Approval of SMART’ project.

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Nuclear Energy and Engineering
Materials Science(all)
Safety, Risk, Reliability and Quality
Waste Management and Disposal
Mechanical Engineering

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10.1016/j.nucengdes.2011.08.029

Cite this

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title = "Dynamic characteristics of a perforated cylindrical shell for flow distribution in SMART",

abstract = "The System-integrated Modular Advanced ReacTor (SMART) is a small nuclear reactor under development in Korea. It is equipped with a perforated cylindrical shell, which is called a flow skirt, in the lower plenum of the reactor for uniform flow distribution and to prevent inflow of debris into the core. This perforated cylindrical shell can be excited by external forces such as seismic or pump pulsation loads. The dynamic characteristics of the perforated cylindrical shell must be identified for further dynamic analysis. This research explores the modal analysis of the scaled-down flow skirt model submerged in coolant water. For the numerical simulation, finite element analysis is carried out to extract modal characteristics of the structure considering the fluid-structure interaction and we introduce the NAVMI factor for similarity analysis. In the finite element model, the whole shape of the perforated cylindrical shell is simulated instead of using the effective material properties. In addition, a 1/12 scaled-down flow skirt is manufactured, and an experiment is designed using an exciter and waterproof accelerometers for the modal test. Due to excellent agreement between the modal test results and the finite element analysis results such as natural frequencies and mode shapes, the finite element model is validated and can be used to predict the dynamic characteristics of the real flow skirt. Moreover, the natural frequency of the real flow skirt can be calculated from the NAVMI factor and is in good agreement with the FEM result.",

author = "Seungho Lim and Youngin Choi and Kyungrok Ha and Park, {Kyoung Su} and Park, {No Cheol} and Park, {Young Pil} and Jeong, {Kyeong Hoon} and Park, {Jin Seok}",

note = "Funding Information: The support of the Korea Atomic Energy Research Institute (KAERI), which has designated this research as a specialization project by Yonsei University, is gratefully acknowledged. Acknowledgement is also given to the {\textquoteleft}Technology Verification and Acquisition of Standard Design Approval of SMART{\textquoteright} project.",

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AU - Park, Young Pil

AU - Jeong, Kyeong Hoon

AU - Park, Jin Seok

N1 - Funding Information: The support of the Korea Atomic Energy Research Institute (KAERI), which has designated this research as a specialization project by Yonsei University, is gratefully acknowledged. Acknowledgement is also given to the ‘Technology Verification and Acquisition of Standard Design Approval of SMART’ project.

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AB - The System-integrated Modular Advanced ReacTor (SMART) is a small nuclear reactor under development in Korea. It is equipped with a perforated cylindrical shell, which is called a flow skirt, in the lower plenum of the reactor for uniform flow distribution and to prevent inflow of debris into the core. This perforated cylindrical shell can be excited by external forces such as seismic or pump pulsation loads. The dynamic characteristics of the perforated cylindrical shell must be identified for further dynamic analysis. This research explores the modal analysis of the scaled-down flow skirt model submerged in coolant water. For the numerical simulation, finite element analysis is carried out to extract modal characteristics of the structure considering the fluid-structure interaction and we introduce the NAVMI factor for similarity analysis. In the finite element model, the whole shape of the perforated cylindrical shell is simulated instead of using the effective material properties. In addition, a 1/12 scaled-down flow skirt is manufactured, and an experiment is designed using an exciter and waterproof accelerometers for the modal test. Due to excellent agreement between the modal test results and the finite element analysis results such as natural frequencies and mode shapes, the finite element model is validated and can be used to predict the dynamic characteristics of the real flow skirt. Moreover, the natural frequency of the real flow skirt can be calculated from the NAVMI factor and is in good agreement with the FEM result.

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Dynamic characteristics of a perforated cylindrical shell for flow distribution in SMART

Abstract

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