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Energies
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Seismic Isolation of Nuclear Power Plants
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Seismic Isolation of Nuclear Power Plants

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "B4: Nuclear Energy".

Deadline for manuscript submissions: closed (10 October 2022) | Viewed by 8019

Special Issue Editors

Dr. Min Kyu Kim

E-Mail Website
Guest Editor
Nuclear Safety and Security division, Korea Atomic Energy Research Institute (KAERI), Daejeon 34057, Korea
Interests: seismic engineering; seismic isolation engineering; probabilistic seismic safety assessment; seismic fragility assessment; multi hazard risk assessment; tsunami risk assessment
Dr. Jung Han Kim

E-Mail Website
Guest Editor
Department of Civil Engineering, Pusan National University, Busan 46241, Korea
Interests: seismic design criteria; engineering seismology; seismic safety assessment of nuclear power plants; base isolation system
Prof. Dr. Gilberto Mosqueda

E-Mail Website
Guest Editor
Department of Structural Engineering, University of California, San Diego 92521, CA, USA
Interests: seismic isolation and energy dissipation; experimental methods in earthquake engineering; hybrid simulation; seismic response of nonstructural systems

Special Issue Information

Dear Colleagues,

Seismic isolation is one of the most effective and applicable solutions for increasing the safety of a nuclear power plant against moderate and strong earthquakes.  While the performance of seismic isolation systems has been observed in real and simulated laboratory environments and has also already been applied to many conventional structures, application to nuclear power plants requires more research than conventional structures. Nuclear power plants should be designed and constructed using stringent seismic design criteria and should satisfy certain safety goals. Therefore, the application of seismic isolation system to NPPs needs additional considerations compared to the conventional structures.

This special issue will address major issues related to the application of the seismic isolation systems at nuclear power plants. The scopes of this special issue includes: (1) design criteria and regulation guidelines, (2) design of seismic isolation device for NPPs, (3) nonlinear behaviour prediction of seismic isolation system and seismic isolated NPPs, (4) ultimate capacity evaluation of seismic isolation devices, (5) performance test of seismic isolation devices, (6) behaviour of interface piping system, (7) seismic fragility assessment of seismic isolated structures and equipment, (8) seismic risk assessment of seismic isolated NPPs, (9) maintenance and monitoring system, etc.

Dr. Min Kyu Kim
Dr. Jung Han Kim
Prof. Dr. Gilberto Mosqueda
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Seismic Isolation
  • Nonlinear behavior
  • Ultimate capacity
  • Performance test
  • Interface piping system
  • Seismic fragility
  • Seismic risk

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Published Papers (3 papers)

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Research

18 pages, 6493 KiB  
Article
Enhanced Seismic Protection System for an Emergency Diesel Generator Unit
by Ricardo Bustamante, Gilberto Mosqueda and Minkyu Kim
Energies 2022, 15(5), 1728; https://doi.org/10.3390/en15051728 - 25 Feb 2022
Cited by 1 | Viewed by 1892
Abstract
Nuclear power plants are required to maintain operation after an earthquake, leading to a safe shutdown if necessary. In the case of a loss of offsite power, the onsite emergency diesel generator is critical to ensure procedural operations of the nuclear power plant. [...] Read more.
Nuclear power plants are required to maintain operation after an earthquake, leading to a safe shutdown if necessary. In the case of a loss of offsite power, the onsite emergency diesel generator is critical to ensure procedural operations of the nuclear power plant. As a means to reduce the overall seismic risk, a three-dimensional seismic protection system is proposed to enhance the seismic performance of the emergency diesel generator. The proposed seismic isolation system decouples the horizontal and vertical components of shaking and considers available hardware to achieve an effective isolation solution over the range of excitation frequencies considered. Numerical analysis of the proposed system demonstrates a reduction in seismic demands on the emergency diesel generator and provides a higher safety margin than conventional base installation procedures. Umbilical lines that cross the isolation plane are considered and impose additional constraints on the displacement capacity of the isolation system. However, increasing the displacement capacity of these components can significantly increase the safety margin against failure. The seismic protection system can be customized depending on the seismic hazard and application to different seismic regions. Full article
(This article belongs to the Special Issue Seismic Isolation of Nuclear Power Plants)
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18 pages, 12123 KiB  
Article
Optimal Earthquake Intensity Measures for Probabilistic Seismic Demand Models of Base-Isolated Nuclear Power Plant Structures
by Duy-Duan Nguyen, Tae-Hyung Lee and Van-Tien Phan
Energies 2021, 14(16), 5163; https://doi.org/10.3390/en14165163 - 20 Aug 2021
Cited by 11 | Viewed by 2616
Abstract
The purpose of this study is to evaluate the optimal earthquake intensity measures (IMs) for probabilistic seismic demand models (PSDMs) of the base-isolated nuclear power plant (NPP) structures. The numerical model of NPP structures is developed using a lumped-mass stick model, in which [...] Read more.
The purpose of this study is to evaluate the optimal earthquake intensity measures (IMs) for probabilistic seismic demand models (PSDMs) of the base-isolated nuclear power plant (NPP) structures. The numerical model of NPP structures is developed using a lumped-mass stick model, in which a bilinear model is employed to simulate the force-displacement relations of base isolators. In this study, 20 different IMs are considered and 90 ground motion records are used to perform time-history analyses. The seismic engineering demand parameters (EDPs) are monitored in terms of maximum floor displacement (MFD), the maximum floor acceleration (MFA) of the structures, and maximum isolator displacement (MID). As a result, a set of PSDMs of the base-isolated structure is developed based on three EDPs (i.e., MFD, MFA, and MID) associated with 20 IMs. Four statistical parameters including the coefficient of determination, efficiency (i.e., standard deviation), practicality, and proficiency are then calculated to evaluate optimal IMs for seismic performances of the isolated NPP structures. The results reveal that the optimal IMs for PSDMs with respect to MFD and MID are velocity spectrum intensity, Housner intensity, peak ground velocity, and spectral velocity at the fundamental period. Meanwhile, peak ground acceleration, acceleration spectrum intensity, A95, effective peak acceleration, and sustained maximum acceleration are efficient IMs for PSDMs with respect to MFA of the base-isolated structures. On the other hand, cumulative absolute velocity is not recommended for determining the exceedance of the operating basis earthquake of base-isolated NPP structures. Full article
(This article belongs to the Special Issue Seismic Isolation of Nuclear Power Plants)
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16 pages, 6106 KiB  
Article
Seismic Performance of Piping Systems of Isolated Nuclear Power Plants Determined by Numerical Considerations
by Sungjin Chang, Bubgyu Jeon, Shinyoung Kwag, Daegi Hahm and Seunghyun Eem
Energies 2021, 14(13), 4028; https://doi.org/10.3390/en14134028 - 4 Jul 2021
Cited by 2 | Viewed by 2569
Abstract
The interest in the seismic performance of nuclear power plants has increased worldwide since the Fukushima Daiichi Nuclear Power Plant incident. In Korea, interest in the seismic safety of nuclear power plants has increased since the earthquake events in Gyeongju (2016) and Pohang [...] Read more.
The interest in the seismic performance of nuclear power plants has increased worldwide since the Fukushima Daiichi Nuclear Power Plant incident. In Korea, interest in the seismic safety of nuclear power plants has increased since the earthquake events in Gyeongju (2016) and Pohang (2017). In Korea, studies have been conducted to apply seismic isolation systems to ensure seismic safety while minimizing the design changes to nuclear power plants. Nuclear power plants with seismic isolation systems may have a higher seismic risk due to the failure of the piping system in the structure after a relatively large displacement. Therefore, it is essential to secure the seismic safety of pipes for the safe operation of nuclear power plants. The seismic safety of pipes is determined by seismic fragility analysis. Seismic fragility analysis requires many seismic response analyses because it is a statistical approach to various random variables. Typical numerical conditions affecting the seismic response analysis of pipes are the convergence conditions and mesh size in numerical analysis. This study examined the change in the seismic safety of piping according to the numerical conditions. The difference in the seismic response analysis results of the piping according to the mesh size was analyzed comparatively. In addition, the change in the seismic fragility curve of the piping according to the convergence conditions was investigated. Full article
(This article belongs to the Special Issue Seismic Isolation of Nuclear Power Plants)
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