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Author:
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ISBN:
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Languages : en
Pages : 34
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Book Description
The existing fleet of nuclear power plants in the United States have initial operating licenses of 40 years, and many of these plants have applied for and received license extensions. As plant structures, systems, and components age, their useful life--considering both structural integrity and performance--is reduced as a result of deterioration of the materials. Assessment and management of aging concrete structures in nuclear plants require a more systematic approach than simple reliance on existing code-based design margins of safety. Structural health monitoring is required to produce actionable information regarding structural integrity that supports operational and maintenance decisions. The online monitoring of concrete structures project conducted under the Advanced Instrumentation, Information, and Control Technologies Pathway of the Light Water Reactor Sustainability program at Idaho National Laboratory is seeking to develop and demonstrate capabilities for concrete structures health monitoring. Through this research project, several national laboratories and Vanderbilt University propose to develop a framework of research activities for the health monitoring of nuclear power plant concrete structures that includes the integration of four elements--damage modeling, monitoring, data analytics, and uncertainty quantification. This report briefly discusses activities in this project during October-December, 2014. The most significant activity during this period was the organizing of a two-day workshop on research needs in online monitoring of concrete structures, hosted by Vanderbilt University in November 2014. Thirty invitees from academia, industry and government participated in the workshop. The presentations and discussions at the workshop surveyed current activities related to concrete structures deterioration modeling and monitoring, and identified the challenges, knowledge gaps, and opportunities for advancing the state of the art; these discussions are summarized in this report.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
The existing fleet of nuclear power plants in the United States have initial operating licenses of 40 years, and many of these plants have applied for and received license extensions. As plant structures, systems, and components age, their useful life--considering both structural integrity and performance--is reduced as a result of deterioration of the materials. Assessment and management of aging concrete structures in nuclear plants require a more systematic approach than simple reliance on existing code-based design margins of safety. Structural health monitoring is required to produce actionable information regarding structural integrity that supports operational and maintenance decisions. The online monitoring of concrete structures project conducted under the Advanced Instrumentation, Information, and Control Technologies Pathway of the Light Water Reactor Sustainability program at Idaho National Laboratory is seeking to develop and demonstrate capabilities for concrete structures health monitoring. Through this research project, several national laboratories and Vanderbilt University propose to develop a framework of research activities for the health monitoring of nuclear power plant concrete structures that includes the integration of four elements--damage modeling, monitoring, data analytics, and uncertainty quantification. This report briefly discusses activities in this project during October-December, 2014. The most significant activity during this period was the organizing of a two-day workshop on research needs in online monitoring of concrete structures, hosted by Vanderbilt University in November 2014. Thirty invitees from academia, industry and government participated in the workshop. The presentations and discussions at the workshop surveyed current activities related to concrete structures deterioration modeling and monitoring, and identified the challenges, knowledge gaps, and opportunities for advancing the state of the art; these discussions are summarized in this report.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The existing fleets of nuclear power plants in the United States have initial operating licenses of 40 years, though most these plants have applied for and received license extensions. As plant structures, systems, and components age, their useful life--considering both structural integrity and performance--is reduced as a result of deterioration of the materials. The online monitoring of concrete structure conducted under the Advanced Instrumentation, Information, and Control Technologies Pathway of the Light Water Reactor Sustainability program at Idaho National Laboratory will develop and demonstrate concrete structures health monitoring capabilities. Assessment and management of aging concrete structures in nuclear plants require a more systematic approach than simple reliance on existing code margins of safety. Therefore, the structural health monitoring is required to produce actionable information regarding structural integrity that supports operational and maintenance decisions. Through this research project, several national laboratories and Vanderbilt University proposes to develop a framework of research activities for the health monitoring of nuclear power plant concrete structures that includes integration of four elements--damage modeling, monitoring, data analytics, and uncertainty quantification. This report briefly discusses available techniques and ongoing challenges in each of the four elements of the proposed framework with emphasis on degradation mechanisms and online monitoring techniques.
Author: Iain Mckeeman
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Monitoring the prestress level of nuclear prestressed concrete containments and prestressedconcrete pressure vessels is an important maintenance activity on a nuclear site. Adequate prestress level ensures the containment or vessel is able to withstand internal pressure and contain radioactive material in the unlikely event of an accident. Prestress monitoring iscurrently limited to manual measurements of the total prestress force at the prestressing tendon ends. It would be beneficial to develop an online monitoring system which can measure prestress levels at several locations along a prestressing tendon. A system like this could replace existing prestress monitoring, ensure safe operation through early warning of prestress loss,and provide additional data to make informed decisions about maintenance, lifetime extension and future reactor design.This project developed a fibre optic system capable of monitoring prestress levels. Standard 7-wire prestressing strands were instrumented with fibre Bragg grating temperature and strain sensors, while load cells measured total force at the strand ends. This provided measurement of all prestress loss effects. Sensor fabrication employed brazing to create an all-metal sensor package to reduce radiation effects in the fibre, and withstand the high stress involved in this harsh environment application. For the first time the sensors and instrumented strands were thoroughly tested in the laboratory and in two field trials representing similar conditions to the real application. Strain sensors were shown to measure strain up to 7.2 mƐ, equivalent to approximately 1300 MPa, consistently for three cycles in the laboratory. Instrumented prestressing strands were tested, during the first field trial, in two concrete beams for 170 days where sensors measured prestress levels in ambient conditions. In the second field trial several instrumented strands were stressed on a multi strain calibration rig. The knowledge and experience gained during the project will facilitate the development of a fibre optic system capable of monitoring prestress levels in prestressed concrete containments and prestressed concrete pressure vessels.
Author: Dan J. Naus
Publisher: RILEM Publications
ISBN: 9782912143075
Category : Concrete
Languages : en
Pages : 224
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
Assessment and management of aging concrete structures in nuclear power plants require a more systematic approach than simple reliance on existing code margins of safety. Structural health monitoring of concrete structures aims to understand the current health condition of a structure based on heterogeneous measurements to produce high confidence actionable information regarding structural integrity that supports operational and maintenance decisions. This ongoing research project is seeking to develop a probabilistic framework for health diagnosis and prognosis of aging concrete structures in a nuclear power plant subjected to physical, chemical, environment, and mechanical degradation. The proposed framework consists of four elements--damage modeling, monitoring, data analytics, and uncertainty quantification. This report describes a proof-of-concept example on a small concrete slab subjected to a freeze-thaw experiment that explores techniques in each of the four elements of the framework and their integration. An experimental set-up at Vanderbilt University's Laboratory for Systems Integrity and Reliability is used to research effective combination of full-field techniques that include infrared thermography, digital image correlation, and ultrasonic measurement. The measured data are linked to the probabilistic framework: the thermography, digital image correlation data, and ultrasonic measurement data are used for Bayesian calibration of model parameters, for diagnosis of damage, and for prognosis of future damage. The proof-of-concept demonstration presented in this report highlights the significance of each element of the framework and their integration.
Author: Valérie L'Hostis
Publisher: Springer
ISBN: 9402409041
Category : Technology & Engineering
Languages : en
Pages : 95
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Book Description
The main outcomes of RILEM TC-226-CNM are summarized in this book. Key input was provided by researchers from countries that are main contributors in the R&D, design, construction, operation, and regulation of waste nuclear reinforced concrete facilities. Nuclear power plants and many of the facilities and structures used for the management of radioactive waste materials generated by the fuel cycle use concrete in their construction. RILEM TC 226 CNM covered several areas including functional and performance requirements for concrete structures; degradation processes; phenomenological modelling, field experiences, tests approaches, instrumentation and monitoring methods dedicated to performance assessments; service-life models; aging Management of Nuclear Power Plants, repair techniques; codes and standards specific to radioactive waste facilities.
Author: Kanji Ono
Publisher: MDPI
ISBN: 3039284746
Category : Technology & Engineering
Languages : en
Pages : 298
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Book Description
Acoustic emission (AE) techniques have successfully been used for assuring the structural integrity of large rocket motorcases since 1963, and their uses have expanded to ever larger structures, especially as structural health monitoring (SHM) of large structures has become the most urgent task for engineering communities around the world. The needs for advanced AE monitoring methods are felt keenly by those dealing with aging infrastructures. Many publications have appeared covering various aspects of AE techniques, but documentation of actual applications of AE techniques has been mostly limited to reports of successful results without technical details that allow objective evaluation of the results. There are some exceptions in the literature. In this Special Issue of the Acoustics section of Applied Sciences, we seek contributions covering these exceptions cited here. Here, we seek contributions describing case histories of AE applications to large structures that have achieved the goals of SHM by providing adequate technical information supporting the success stories. Types of structures can include aerospace and geological structures, bridges, buildings, factories, maritime facilities, off-shore structures, etc. Experiences with AE monitoring methods designed and proven for large stru
Author: C. J. Hookham
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 77
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Book Description
Author: Hidekazu Yoshikawa
Publisher: Springer Science & Business Media
ISBN: 4431546103
Category : Technology & Engineering
Languages : en
Pages : 310
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Book Description
This book introduces advanced methods of computational and information systems allowing readers to better understand the state-of-the-art design and implementation technology needed to maintain and enhance the safe operation of nuclear power plants. The subjects dealt with in the book are (i) Full digital instrumentation and control systems and human–machine interface technologies (ii) Risk monitoring methods for large and complex plants (iii) Condition monitors for plant components (iv) Virtual and augmented reality for nuclear power plants and (v) Software reliability verification and validation for nuclear power plants. The target readers of this book are Ph.D. students, researchers and engineers in the field of nuclear power engineering.
Author: Michael Ratner
Publisher: The Capitol Net Inc
ISBN: 1587332183
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
Part of the government series on energy, from TheCapitol.Net, this text discusses the nuclear energy issues facing Congress including federal incentives for new commercial reactors, radioactive waste management policy, research and development priorities, power plant safety and regulation, nuclear weapons proliferation, and security against terrorist attacks.
