Historical Context of Elevated Temperature Structural Integrity for Next Generation Plants: Regulatory Safety Issues in Structural Design Criteria of ASME Section III Subsection NH

O’Donnell, W. J.; Hull, A.B.; Malik, Shah

doi:10.1115/pvp2008-61870

Cited by 6 publications

(7 citation statements)

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“…As described earlier, high-temperature creep (and creep-fatigue) is expected to be mechanisms of concern in passive components in advanced reactors (O'Donnell et al 2008). Within the simplifieddesign being considered in this research, creep is expected to be of concern in vessel internals and in the materials comprising the heat-exchanger.…”

Section: Laboratory-scale High-temperature Creep Test Systemmentioning

confidence: 87%

“…Specifically, the goal will be to examine primary and secondary stages of creep damage. The material of choice is austenitic stainless steel because of its anticipated wide use in several advanced reactor concepts (O'Donnell et al 2008).…”

Section: Assumptionsmentioning

confidence: 99%

“…These same requirements are now being evaluated for their applicability to anticipated new degradation mechanisms (Wilkowski et al 2002) as these plants continue to age. AdvSMRs, with their higher operating temperatures and corrosive coolant chemistry, can be expected to experience mechanisms not commonly seen in LWRs (O'Donnell et al 2008). Mitigation of such degradation mechanisms will require early warning to ensure that appropriate actions can be taken before 2.11 significant degradation accumulates to the point where the only possible mitigating action is to replace the component.…”

Section: Measurement Techniques To Estimate Creep Degradationmentioning

confidence: 99%

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Local-Level Prognostics Health Management Systems Framework for Passive AdvSMR Components. Interim Report

Ramuhalli

Roy

Hirt

et al. 2014

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Section: Laboratory-scale High-temperature Creep Test Systemmentioning

confidence: 87%

Section: Assumptionsmentioning

confidence: 99%

Section: Measurement Techniques To Estimate Creep Degradationmentioning

confidence: 99%

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Local-Level Prognostics Health Management Systems Framework for Passive AdvSMR Components. Interim Report

Ramuhalli

Roy

Hirt

et al. 2014

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“…In particular, degradation (such as cracking, creep or creepfatigue damage) in passive components, if not addressed in a timely fashion, is likely to result in unplanned plant shutdowns. This is especially important for generally inaccessible passive components and key passive safety system components (such as heat exchanger tubing, primary boundary components, and reactor internals) (O'Donnell et al 2008). Thus, degradation in all passive components will need to be monitored and well-managed to maximize safety, operational lifetimes, and plant reliability while minimizing maintenance demands, if reduced economies-of-scale are to be overcome.…”

Section: Introductionmentioning

confidence: 99%

Technical Needs for Prototypic Prognostic Technique Demonstration for Advanced Small Modular Reactor Passive Components

Meyer¹,

Coble²,

Hirt³

et al. 2013

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A key national energy priority to promote energy security is sustainable nuclear power. Nuclear energy currently contributes approximately 20% of baseload electrical needs in the United States and is considered a reliable generation source to meet future electricity needs. Advanced small modular reactors (AdvSMRs) using non-light-water reactor coolants such as liquid metal, helium, or liquid salt are promising mid-to long-term options being explored for added functionality and affordability in future reliable nuclear power deployment. AdvSMRs can offer potential advantages over more conventional technologies in the areas of safety and reliability, sustainability, affordability, functionality, and proliferation resistance. However, a number of technical challenges will need to be addressed before AdvSMRs are ready for deployment, given their potential for remote deployment with minimal staffing, longer operating cycles between planned refueling and maintenance outages, and support for multiple energy applications. In addition, AdvSMRs (like SMRs based on more conventional light-water reactor technologies) will have reduced economy-of-scale savings when compared to current generation lightwater reactors (LWRs). Issues related to AdvSMR deployment can be addressed through cross-cutting RD&D involving instrumentation, controls, and human-machine interface (ICHMI) technologies. Specifically, diagnostics and prognostics technologies provide a mechanism for improving safety and reliability of AdvSMRs through integrated health management of passive components. This report identifies activities and develops an outline of a research plan to address the high-priority technical needs for demonstrating prototypic prognostic techniques to manage degradation of passive AdvSMR components. Concepts for AdvSMRs span a wide range of design maturity, specificity, and concepts of operation, including multi-unit, multi-product-stream generating stations. Key to the development and deployment of AdvSMRs will be the ability to ensure safe and affordable operation of these reactor designs. AdvSMR designs generally place more emphasis on passive systems to assure safety. However, degradation in all passive components will need to be well-managed to maximize safety, operational lifetimes, and plant reliability while minimizing maintenance demands, if reduced economies-of-scale are to be overcome. Traditional approaches such as periodic in-service nondestructive inspections are likely to have limited applicability to AdvSMRs, given the expectation of longer operating periods and potential difficulties with inspection access to critical components. Advanced instrumentation and control (I&C) technologies can provide a mechanism for achieving these goals. However, the significant technology and environmental differences between AdvSMRs and conventional LWRs and the potential for modularized deployment result in unique challenges and needs for advanced ICHMI applications in AdvSMRs. v prognostics is also documented. This assessment, combined wi...

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“…Other degradation mechanisms also become important when considering advanced reactor designs (O'Donnell et al 2008), including high-temperature effects on new materials such as 9Cr-1Mo steel. Each of these degradation types, as well as other degradation mechanisms that occur in these components, likely have different underlying mechanisms (many of which are poorly understood) that drive the accumulation of damage and initiation of cracking.…”

Section: Metalsmentioning

confidence: 99%

Prognostics and Health Management in Nuclear Power Plants: A Review of Technologies and Applications

Coble¹,

Ramuhalli²,

Bond³

et al. 2012

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Recent years have seen a resurgence of nuclear power worldwide, with interest in extending the operating life of the approximately 436 reactors currently in service (as of March, 2012), 61 new reactors being constructed, and as many as 162 under consideration. Renewed worldwide interest in nuclear power has been somewhat tempered by the March 2011 incident at Fukushima Dai-ichi in Japan. However, nuclear power is still considered a key element in meeting future worldwide sustainable energy, energy security, and emissions goals. Currently, three separate thrusts to safe and economical nuclear power development for energy security are being pursued in the United States: (i) longer term operation for the legacy fleet, from 40-60 and possibly 60-80 years; (ii) near-term new nuclear plants with a 60-year design life; and (iii) small modular reactors, which are expected to employ light water reactor technology at least in the medium term. Within these activities, attention is turning to enhanced methods for plant component and structural health management.The operating U.S. fleet includes 104 light water reactors. In addition, there are now (as of May 2012) four new nuclear power plants (AP-1000 plants) under construction in the United States, and two delayed plants are being completed by the Tennessee Valley Authority. There is also interest in the United States in small modular reactors (SMRs), which could be easier to match to existing grid infrastructure and which could replace aging coal fired plants. The current low price for natural gas presents a challenge to the economics of nuclear power, at least in the short term; however, some recent studies have demonstrated that nuclear generation will be competitive in the longer term (at least in some markets) when anticipated escalation in gas prices and the cost of building, operating, and maintaining gas-fired plants are considered over those same time periods.This report reviews the current state of the art of prognostics and health management (PHM) for nuclear power systems and related technology currently applied in field or under development in other technological application areas, as well as key research needs and technical gaps for increased use of PHM in nuclear power systems. The historical approach to monitoring and maintenance in nuclear power plants (NPPs), including the Maintenance Rule for active components and Aging Management Plans for passive components, are reviewed. An outline is given for the technical and economic challenges that make PHM attractive for both legacy plants through Light Water Reactor Sustainability (LWRS) and new plant designs. There is a general introduction to PHM systems for monitoring, fault detection and diagnostics, and prognostics in other, non-nuclear fields. The state of the art for health monitoring in nuclear power systems is reviewed. A discussion of related technologies that support the application of PHM systems in NPPs, including digital instrumentation and control systems, wired and wireless sensor techno...

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Historical Context of Elevated Temperature Structural Integrity for Next Generation Plants: Regulatory Safety Issues in Structural Design Criteria of ASME Section III Subsection NH

Cited by 6 publications

References 0 publications

Local-Level Prognostics Health Management Systems Framework for Passive AdvSMR Components. Interim Report

Local-Level Prognostics Health Management Systems Framework for Passive AdvSMR Components. Interim Report

Technical Needs for Prototypic Prognostic Technique Demonstration for Advanced Small Modular Reactor Passive Components

Prognostics and Health Management in Nuclear Power Plants: A Review of Technologies and Applications

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