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Assessment Of The Effect Of Different Isolation Systems On Seismic Response Of A Nuclear Power Plant
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Book Synopsis Assessment of the Effect of Different Isolation Systems on Seismic Response of a Nuclear Power Plant by : Jenna Wong
Download or read book Assessment of the Effect of Different Isolation Systems on Seismic Response of a Nuclear Power Plant written by Jenna Wong and published by . This book was released on 2014 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic isolation is utilized in both traditional and industrial structures for its ability to reduce structural responses while effectively protecting sensitive building contents. Although this mature technology has been studied extensively, there is limited research on its application to Nuclear Power Plants (NPPs). Studies have yet to address topics such as sensitivity of equipment and the effects of seismic isolation on floor response spectra (FRS) caused by high frequencies and the inclusion of vertical motion. This paper's studies investigate the relationship between structural response and isolator mechanics, ground motion sensitivity, and the effectiveness of various isolator types, especially nonlinear isolators. Overall trends are identified that provide insight into the interaction between the isolation system and the response at various levels of the NPP. By understanding these relationships and connections, a set of valid recommendations for the selection and design of isolation systems is provided. This work is pursued through analyzing the performance of an APR1400 plant considering regulatory guidelines and utilizing a variety of ground motions, isolator types, and isolator models.
Book Synopsis Hybrid Simulation to Assess Performance of Seismic Isolation in Nuclear Power Plants by : International Atomic Energy Agency
Download or read book Hybrid Simulation to Assess Performance of Seismic Isolation in Nuclear Power Plants written by International Atomic Energy Agency and published by . This book was released on 2020-02-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic isolation technology has the potential to significantly reduce the overall risk posed by earthquake ground motions to nuclear power plants. A testing programme is an integral part of a seismic isolation project. Not only must the isolating devices be characterized for design purposes, but also validation of the analytical procedures used in design is required. Hybrid simulation is a testing technique which is a good candidate to experimentally assess the behaviour of an isolation system. The method combines the computation of the response of the isolated structure with the experimental determination of the behaviour of full-scale isolators under the demand imposed by the movement of ground and structure. This publication contributes to the assessment of the method as a tool for the design and safety demonstration of base-isolated nuclear facility buildings.
Book Synopsis Advanced Modeling and Evaluation of the Response of Base-Isolated Nuclear Facility Structures to Vertical Earthquake Excitation by : Eric Scott Keldrauk
Download or read book Advanced Modeling and Evaluation of the Response of Base-Isolated Nuclear Facility Structures to Vertical Earthquake Excitation written by Eric Scott Keldrauk and published by . This book was released on 2012 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: The commissioning and construction of new nuclear power plants in the United States has dwindled over the past 30 years despite significant innovation in reactor technology. This is partially due to the ever-increasing seismic hazard estimates, which increases the demand on and risk to nuclear power plant structures. Seismic base isolation is a mature technology which introduces a laterally-flexible and vertically-stiff layer between the foundation and superstructure to significantly reduce the seismic response of the structure, systems, and components therein. Such devices have also been noted to concentrate the displacement response in one plane, reduce higher-mode participation, and provide damping to protect against excessive displacements, all of which aid in increasing safety margins for seismically-isolated nuclear structures. Despite numerous studies analyzing the applicability of seismic base isolation to nuclear power plant structures, some of which are discussed herein, no seismically-isolated nuclear plant has been constructed in the United States. This study presents a time-domain procedure for analyzing the performance of seismically-isolated nuclear structures in response to design-basis earthquake events using ALE3D. The simulations serve as a parametric study to assess the effects of soil column type, seismic isolation model, superstructure mesh, and ground motion selection on global displacements, rotations, and accelerations, as well as internal floor accelerations. Explicit modeling of the soil columns and superstructures enables detailed analysis of soil-structure interaction. The soil columns analyzed have constant properties over the height of the finite element soil mesh and include rock, soft rock, and stiff soil sites, as well as a "no soil" case for comparison. Four separate 3-dimensional seismic isolation bearing models were coded into ALE3D and validated. These include models for friction pendulum, triple friction pendulum, simplified lead rubber, and robust lead rubber bearings. Lastly, two superstructure finite element meshes were considered: a cylindrical plant design meant to represent a typical conceptual design for advanced reactors, and a rectangular plant design meant to represent an advanced boiling water reactor. The ground motions considered include 30 three-component time history records scaled to meet the seismic hazard for the Diablo Canyon nuclear plant. Every combination of soil column, isolator model, and superstructure were subjected to a subset of three of the harshest ground motions, termed the "basic motions", and the combinations which included the rectangular plant design atop the rock soil column were subjected to all 30 motions. The results of the various simulations including accelerations in the soil columns and superstructures as well as displacements and rotations in the isolators and superstructures are presented. The results suggest three possible effects: an isolator-type effect, a soil-type effect, and a slenderness effect. The isolator-type effect refers to significant increases in vertical soil acceleration amplifications, isolator uplift/tension, and global rotations including torsion and overturning for friction bearings in comparison to elastomeric bearings. Additionally it is noted that inclusion of lead plug softening has the effect of increasing peak lateral isolator deformations, especially for the ground motions that naturally induce high-amplitude deformations in the bearings. These results suggest that uplift/tension may be troublesome in high-seismic areas and the use of restrainers should be analyzed as a possible solution. Furthermore, these results reinforce the lateral design displacement estimate procedures for seismically-isolated nuclear structures in ASCE4-11. The results prove that explicit inclusion of the soil column is necessary for proper response characterization and the chosen soil properties greatly affect the efficacy of seismic isolation designs. The soil-type effect comes from observations of comparative simulations which show that, in general, peak isolator uplift/tension and deformation, as well as peak global displacements and rotations including torsion and overturning increase as the soil column becomes less-stiff, regardless of the isolator model or superstructure considered. These results suggest that although seismic isolation can be effective for structures atop a variety of soil columns, it is imperative that a single isolator design only be considered applicable to a corresponding soil column unless extensive analyses prove otherwise for a specific case. Differences in peak response parameters between the two superstructures point to a possible slenderness effect. Specifically, the isolator deformations as well as the global displacements and rotations are observed to increase for the cylindrical superstructure in comparison to the rectangular superstructure cases utilizing the same ground motion, soil column, and isolator model. Should further research reaffirm this effect, a practical limit could be set for superstructure slenderness.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Design and Qualification for Nuclear Power Plants by :
Download or read book Seismic Design and Qualification for Nuclear Power Plants written by and published by . This book was released on 1992 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide was originally issued as Safety Guide No. 50-SG-S2. It provides details on the design of a nuclear power plant such that earthquakes at the site determined according to Safety Guide No. 50-SG-S1 will not jeopardize its safety.
Book Synopsis Infrastructure Systems for Nuclear Energy by : Thomas T. C. Hsu
Download or read book Infrastructure Systems for Nuclear Energy written by Thomas T. C. Hsu and published by John Wiley & Sons. This book was released on 2013-12-02 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developing sufficient energy resources to replace coal, oil and gas is a globally critical necessity. Alternatives to fossil fuels such as wind, solar, or geothermal energies are desirable, but the usable quantities are limited and each has inherent deterrents. The only virtually unlimited energy source is nuclear energy, where safety of infrastructure systems is the paramount concern. Infrastructure Systems for Nuclear Energy addresses the analysis and design of infrastructures associated with nuclear energy. It provides an overview of the current and future nuclear power industry and the infrastructure systems from the perspectives of regulators, operators, practicing engineers and research academics. This book also provides details on investigations of containment structures, nuclear waste storage facilities and the applications of commercial/academic computer software. Specific environments that challenge the behavior of nuclear power plants infrastructure systems such as earthquake, blast, high temperature, irradiation effects, soil-structure interaction effect, etc., are also discussed. Key features: Includes contributions from global experts representing academia and industry Provides an overview of the nuclear power industry and nuclear infrastructure systems Presents the state-of-the-art as well as the future direction for nuclear civil infrastructure systems Infrastructure Systems for Nuclear Energy is a comprehensive, up-to-date reference for researchers and practitioners working in this field and for graduate studies in civil and mechanical engineering.
Book Synopsis Seismic Analysis and Testing of Nuclear Power Plants by : International Atomic Energy Agency
Download or read book Seismic Analysis and Testing of Nuclear Power Plants written by International Atomic Energy Agency and published by . This book was released on 1979 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Eftychia Apostolidi Publisher :International Association for Bridge and Structural Engineering ISBN 13 :385748182X Total Pages :111 pages Book Rating :4.8/5 (574 download)
Book Synopsis Seismic Isolation and Response Control by : Eftychia Apostolidi
Download or read book Seismic Isolation and Response Control written by Eftychia Apostolidi and published by International Association for Bridge and Structural Engineering. This book was released on 2021-12-15 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: The seismic resilience of new and existing structures is a key priority for the protection of human lives and the reduction of economic losses in earthquake prone areas. The modern seismic codes have focused on the upgrade of the structural performance of the new and existing structures. However, in many cases it is preferrable to mitigate the effects of the earthquakes by reducing the induced loads in the structures using seismic isolation and response control devices. The limited expertise in the selection and design of the appropriate system for new and existing structures is the main challenge for an extensive use of seismic isolation and response control systems in practice. This document aims to provide a practical guide by presenting a collection of the most commonly used seismic isolation and response control systems and a critical evaluation of the main characteristics of these systems. Comparisons of the key parameters of the design processes for new buildings with seismic isolation are presented, while the application of seismic isolation systems and response control systems for the retrofitting of existing structures is also examined, followed by various case studies from Greece, Japan, Mexico, New Zealand, and Turkey.
Book Synopsis Seismic Response Analysis of Nuclear Power Plant Systems by : Asadour H. Hadjian
Download or read book Seismic Response Analysis of Nuclear Power Plant Systems written by Asadour H. Hadjian and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Federal Register written by and published by . This book was released on 1974 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summary of Evaluation Findings for the Testing of Seismic Isolation and Energy Dissipating Devices by : Highway Innovative Technology Evaluation Center (U.S.)
Download or read book Summary of Evaluation Findings for the Testing of Seismic Isolation and Energy Dissipating Devices written by Highway Innovative Technology Evaluation Center (U.S.) and published by ASCE Publications. This book was released on 1999-01-01 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF Service Center. his report summarizes the results of an evaluation that was designed to test the performance of 11 seismic isolators and dampers. The devices were tested for stability, response during earthquake simulations, and fatigue and weathering effects.
Book Synopsis Seismic Design for Nuclear Installations by : IAEA
Download or read book Seismic Design for Nuclear Installations written by IAEA and published by International Atomic Energy Agency. This book was released on 2021-12-01 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Safety Guide provides recommendations on how to meet the applicable safety requirements in relation to the design aspects of new nuclear installations subjected to seismic hazard. These recommendations focus on the consistent application of methods and procedures, in accordance with best practice, for seismic analysis, design, testing and qualification of structures, systems and components. New recommendations include applications of seismic isolation systems, the seismic margin to be achieved by the design and application of the graded approach. This Safety Guide is intended for use by organizations involved in the seismic design of nuclear installations, in analysis, verification and review, and in the provision of technical support, as well as by regulatory bodies.
Book Synopsis Reliability and Optimization of Structural Systems by : M Dogaki
Download or read book Reliability and Optimization of Structural Systems written by M Dogaki and published by Routledge. This book was released on 2018-04-27 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains 28 papers including 4 keynote papers presented at the 10th IFIP WG7.5 Working Conference, focusing on the reliability and optimization of structural systems.
Book Synopsis Earthquake Engineering by : Alberto Bernal
Download or read book Earthquake Engineering written by Alberto Bernal and published by CRC Press. This book was released on 1992-01-01 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt: The official proceedings of the 10th world conference on earthquake engineering in Madrid. Coverage includes damage in recent earthquakes, seismic risk and hazard, site effects, structural analysis and design, seismic codes and standards, urban planning, and expert system application.
Book Synopsis Earthquake Engineering by : P. Bisch
Download or read book Earthquake Engineering written by P. Bisch and published by CRC Press. This book was released on 1998-01-01 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text details the proceedings of the 11th European Conference on Earthquake Engineering. CD-ROM contains full text of the 650 papers in printed form. This would have been 6 volumes of 1000 pages each. Topics covered: are: Engineering seismology; Experimental aspects for soils, rocks and construction material; Computational aspects for materials, structures and soil-structure interaction; Civil engineering projects; Active and passive isolation; Industrial facilities, lifelines and equipment; Vulnerability, seismic risk and strengthening; Site effects and spatial variability of seismic motions; Reliability analyses and probabilistic aspects; Design criteria, codees and standards; Eurocode 8 and national applications; Seismic risk in the Mediterranean basin; Post earthquake investigations;
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in the Design of Structures with Passive Energy Dissipation Systems by : Giuseppe Ricciardi
Download or read book Recent Advances in the Design of Structures with Passive Energy Dissipation Systems written by Giuseppe Ricciardi and published by MDPI. This book was released on 2020-06-23 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Passive vibration control plays a crucial role in structural engineering. Common solutions include seismic isolation and damping systems with various kinds of devices, such as viscous, viscoelastic, hysteretic, and friction dampers. These strategies have been widely utilized in engineering practice, and their efficacy has been demonstrated in mitigating damage and preventing the collapse of buildings, bridges, and industrial facilities. However, there is a need for more sophisticated analytical and numerical tools to design structures equipped with optimally configured devices. On the other hand, the family of devices and dissipative elements used for structural protection keeps evolving, because of growing performance demands and new progress achieved in materials science and mechanical engineering. This Special Issue collects 13 contributions related to the development and application of passive vibration control strategies for structures, covering both traditional and innovative devices. In particular, the contributions concern experimental and theoretical investigations of high-efficiency dampers and isolation bearings; optimization of conventional and innovative energy dissipation devices; performance-based and probability-based design of damped structures; application of nonlinear dynamics, random vibration theory, and modern control theory to the design of structures with passive energy dissipation systems; and critical discussion of implemented isolation/damping technologies in significant or emblematic engineering projects.