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

Meyer, Ryan M.; Coble, Jamie B.; Hirt, Evelyn H.; Ramuhalli, Pradeep; Mitchell, Mark R.; Wootan, D.W.; Berglin, Eric J.; Bond, Leonard J.; Henager, Charles H.

doi:10.2172/1162370

Cited by 16 publications

(46 citation statements)

References 183 publications

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“…Details of advanced reactor concepts that are likely to be adapted for AdvSMR concepts are available in the previous report in this series (Coble et al 2013). Additional background on other advanced reactor concepts and operational experience are available in the report on prototypic prognostic techniques for AdvSMRs passive components (Meyer et al 2013a).…”

Section: Advsmr Oandm Conceptsmentioning

confidence: 99%

An Updated Methodology for Enhancing Risk Monitors with Integrated Equipment Condition Assessment

Ramuhalli¹,

Hirt²,

Coles³

et al. 2014

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vii in risk is seen to reduce under certain circumstances. This appears to depend on the contribution of the component to the overall risk (i.e., the "importance" of the component). Repairs or replacements (bringing the components to as-new condition) reduce the risk, although aging of other components may still drive the overall risk higher. As well, we assume that the uncertainty associated with the component condition after repair or replacement is reduced. While this contributes to reducing the uncertainty bounds in the risk metric, uncertainty in the aging of other components may still drive the overall uncertainty higher as well. These pieces of information, when compared to traditional PRA analysis, appear to provide useful information for scheduling maintenance activities based on actual degradation condition and consequent failure probabilities. Specifically, if thresholds may be set on the risk metric of interest, the projected risk and uncertainty bounds provide a mechanism for scheduling maintenance activities whenever the risk (plus uncertainty) exceeds the threshold. Key to accurate uncertainty quantification within the ERM will be the ability to accurately identify failure probabilities of typical components used in AdvSMRs. Such reliability data is not readily available, and for AdvSMR concepts, may comprise data from instrumented test reactors that were operated between the 1970s and 1990s. Available data from such test reactors is being examined for applicability to this project. The ERM can provide additional value through the development of alternative risk metrics. Metrics associated with quantities such as cost or losses due to lost generation or unanticipated plant shutdown may provide valuable insights into the tradeoffs associated with continued plant operation while maintaining adequate safety margins. To this end, alternative risk metrics associated with these quantities are being identified and will be evaluated next. Ongoing and planned research is focused on evaluating alternative risk metrics (including the options described earlier) and the impact of uncertainty on these risk metrics. In addition, we anticipate integrating the ERM methodology with simulation tools that simulate advanced reactor/AdvSMR modules and the impact of component degradation on their performance to perform comprehensive evaluations of the ERM methodology. In addition, we will explore the possibility of evaluations using experimental data, and to this end, will continue to evaluate sources of relevant reliability data, including data from test reactors, and available test-beds. xi Acronyms AC alternating current AdvSMR advanced small modular reactor CAFTA Computer Aided Fault Tree Analysis (system) CCF common cause failure CDF core damage frequency CREDO Centralized Reliability Data Organization (component reliability database

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Section: Advsmr Oandm Conceptsmentioning

confidence: 99%

An Updated Methodology for Enhancing Risk Monitors with Integrated Equipment Condition Assessment

Ramuhalli¹,

Hirt²,

Coles³

et al. 2014

Self Cite

View full text Add to dashboard Cite

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“…The condition indicator is then projected to future times using appropriate prognostic algorithms (Coble et al 2012;Meyer et al 2013), and estimate POF distributions for each key SSC at some point in the future. These estimated POF distributions are used by the ERM to provide a more accurate assessment of the dynamic risk.…”

Section: Enhanced Risk Monitorsmentioning

confidence: 99%

“…Many approaches to estimating the failure probabilities at future times are available for nuclear power system components (Coble et al 2012;Coble et al 2013;Meyer et al 2013). A common approach involves characterization of the expected lifetime of an average system or component operating in an average environment, under average usage conditions.…”

Section: Estimating Failure Probabilitiesmentioning

confidence: 99%

Technical Report on Preliminary Methodology for Enhancing Risk Monitors with Integrated Equipment Condition Assessment

Ramuhalli¹,

Coles²,

Coble³

et al. 2013

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Executive SummaryAdvanced small modular reactors (AdvSMRs) may provide a longer-term alternative to traditional light-water reactors and SMRs based on integral pressurized water reactor concepts currently being considered. AdvSMRs are designed to incorporate multiple modules (which may or may not have shared components and structures) at a single location, comprising a full "plant." AdvSMR operation differs fundamentally from full-size plants because the smaller plants may be used for load-following or peakdemand power generation, instead of baseload generation. AdvSMRs are also being considered for dualuse, where process heat would be used for both electricity generation and another purpose such as hydrogen production or water desalination, shown in Figure Enhancing affordability of AdvSMRs will be critical to ensuring wider deployment. Although some of the loss of economies of scale inherent to AdvSMRs can be recovered, controllable day-to-day costs of AdvSMRs will be dominated by operation and maintenance (O&M) costs.Technologies that help characterize real-time risk are important to controlling O&M costs and improving affordability of AdvSMRs. Given the possibility of frequently changing plant configurations in AdvSMRs, advanced plant configuration information, equipment condition information, and risk monitors are needed to support real-time decisions on O&M. For this purpose, approaches are needed to integrate these three elements in a manner that provides a measure of risk that is customized for each AdvSMR unit, and accounts for the specific operational history of the unit. By integrating technologies for condition assessment with risk monitors, asset optimization and improved economics of AdvSMRs may be enabled by:• Maximizing generation by assessing the potential impact of taking key components offline for testing or maintenance, iv• Supporting reduced O&M staff by aiding in optimization of O&M planning (specifically by assessing the contribution of individual components to changes in risk and using this information for scheduling maintenance activities),• Enabling real-time decisions on stress-relief for risk-significant equipment susceptible to degradation and damage, and• Supporting potential remote siting by providing early warning of potential increases in plant risk.This report describes research results from an initial methodology for such enhanced risk monitors (ERMs) that integrate real-time information about equipment condition and probability of failure (POF) into risk monitors to provide an assessment of dynamic risk as plant equipment ages. This integration occurs at the level of the POF within risk monitors.Risk monitors extend probabilistic risk assessment (PRA) frameworks by incorporating the actual and dynamic plant configuration (e.g., equipment availability, operating regimes, and environmental conditions) into the risk assessment. PRA is itself a systematic safety analysis methodology that follows four steps: identify undesirable consequences (e.g., reactor unavailability, core da...

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“…Some key factors of AdvSMRs that will impact PHM systems for passive components include i) the operating environment, ii) O&M, iii) concepts of operation, iv) materials degradation performance, v) past operating experiences, vi) balance-of-plant, and vii) refueling intervals. A brief discussion of these factors as they relate to AdvSMRs is provided in [3]. For instance, one of the factors of AdvSMRs that will influence the implementation of PHM systems for passive components is the coupling of AdvSMR systems to multiple product streams (illustrated in Fig.…”

Section: Requirements Analysismentioning

confidence: 99%

“…This paper provides a summary of a recent technical needs and research gap assessment documented in a technical report [3]. Research gaps and technical needs are identified based on a requirements analysis for PHM of AdvSMR passive components and a PHM state-of-the-art assessment relevant to AdvSMR passive components.…”

Section: Introductionmentioning

confidence: 99%

Research gaps and technology needs in development of PHM for passive AdvSMR components

Meyer¹,

Ramuhalli²,

Coble³

et al. 2014

AIP Conference Proceedings

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Advanced small modular reactors (AdvSMRs), which are based on modularization of advanced reactor concepts, may provide a longer-term alternative to traditional light-water reactors and near-term small modular reactors (SMRs), which are based on integral pressurized water reactor (iPWR) concepts. SMRs are challenged economically because of losses in economy of scale; thus, there is increased motivation to reduce the controllable operations and maintenance costs through automation technologies including prognostics health management (PHM) systems. In this regard, PHM systems have the potential to play a vital role in supporting the deployment of AdvSMRs and face several unique challenges with respect to implementation for passive AdvSMR components. This paper presents a summary of a research gaps and technical needs assessment performed for implementation of PHM for passive AdvSMR components.

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

Cited by 16 publications

References 183 publications

An Updated Methodology for Enhancing Risk Monitors with Integrated Equipment Condition Assessment

An Updated Methodology for Enhancing Risk Monitors with Integrated Equipment Condition Assessment

Technical Report on Preliminary Methodology for Enhancing Risk Monitors with Integrated Equipment Condition Assessment

Research gaps and technology needs in development of PHM for passive AdvSMR components

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