Instrument Capabilities and Developments at the Halden Reactor Project

Solstad, S.; Nieuwenhove, R. Van

doi:10.13182/nt11-a11486

Cited by 29 publications

(13 citation statements)

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“…Some of these sources include measurement uncertainty, inaccuracy in the models that relate measurements to degradation, uncertainty in future stress conditions, inaccuracy in prognostic models to extrapolate degradation measures, and uncertainty in the POF evaluation method. Methods for uncertainty assessment in prognostics are being examined in the research community (Phani et al 2007;Sankararaman et al 2011;Solstad and Van Nieuwenhove 2011;Wang 2011;Wang et al 2012). These range from closed-form solutions to probabilistic approaches such as the bootstrap technique and Monte Carlo simulations.…”

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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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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“…The position of the magnetically-permeable core can be measured with an accuracy of (references vary on this value). Since the IFE/HRP started with in-core measurements, more than 2200 LVDTs of different types have been installed in different test rigs in the HBWR and other test reactors around the world [14]. A failure rate of less than 10% after 5 years of operation is expected for their LVDTs operating in a wide range of test conditions [14].…”

Section: Dimensionsmentioning

confidence: 99%

“…Since the IFE/HRP started with in-core measurements, more than 2200 LVDTs of different types have been installed in different test rigs in the HBWR and other test reactors around the world [14]. A failure rate of less than 10% after 5 years of operation is expected for their LVDTs operating in a wide range of test conditions [14]. Hence, operating experience has shown that these sensors are a robust, frictionless instrument for detecting dimensional changes in lower-temperature, irradiation environments.…”

Section: Dimensionsmentioning

confidence: 99%

Enhanced in-pile instrumentation at the Advanced Test Reactor

Rempe

Knudson

Daw

et al. 2011

2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications

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Abstract-Many of the sensors deployed at materials and test reactors cannot withstand the high flux/high temperature test conditions often requested by users at U.S. test reactors, such as the Advanced Test Reactor (ATR) at the Idaho National Laboratory. To address this issue, an instrumentation development effort was initiated as part of the ATR National Scientific User Facility in 2007 to support the development and deployment of enhanced in-pile sensors. This paper provides an update on this effort. Specifically, this paper identifies the types of sensors currently available to support in-pile irradiations and those sensors currently available to ATR users. Accomplishments from new sensor technology deployment efforts are highlighted by describing new temperature and thermal conductivity sensors now available to ATR users. Efforts to deploy enhanced in-pile sensors for detecting elongation and real-time flux detectors are also reported, and recently-initiated research to evaluate the viability of advanced technologies to provide enhanced accuracy for measuring key parameters during irradiation testing are noted.

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“…[28][29][30][31][32][33][34][35] Instruments are also available for monitoring the irradiation environment (e.g. SPNDs and miniaturized gamma thermometers) and thermalhydraulic and water chemistry conditions (e.g.…”

Section: -15mentioning

confidence: 99%

Status Report on Efforts to Enhance Instrumentation to Support Advanced Test Reactor Irradiations

Rempe¹,

Knudson²,

Daw³

2011

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The Department of Energy (DOE) designated the Advanced Test Reactor (ATR) as a National Scientific User Facility (NSUF) in April 2007 to support U.S. leadership in nuclear science and technology. By attracting new research users -universities, laboratories, and industry -the ATR NSUF facilitates basic and applied nuclear research and development, further advancing the nation's energy security needs. A key component of the ATR NSUF effort is to prove new in-pile instrumentation techniques that are capable of providing real-time measurements of key parameters during irradiation. To address this need, an assessment of instrumentation available and under-development at other test reactors was completed. Based on this review, recommendations were made with respect to what instrumentation is needed at the ATR; and a strategy was developed for obtaining these sensors. In 2009, a report was issued documenting this program's strategy and initial progress toward accomplishing program objectives. In 2009, a report was issued documenting this instrumentation development strategy and initial progress toward accomplishing instrumentation development program objectives. This document reports progress toward implementing this strategy in 2010.

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Instrument Capabilities and Developments at the Halden Reactor Project

Cited by 29 publications

References 0 publications

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

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

Enhanced in-pile instrumentation at the Advanced Test Reactor

Status Report on Efforts to Enhance Instrumentation to Support Advanced Test Reactor Irradiations

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