A study of the characteristics of the acoustic emission signals for condition monitoring of check valves in nuclear power plants

Lee, Joon-Hyun; Lee, Min-Rae; Kim, Jung-Teak; Luk, V.K.; Jung, Yoong-Ho

doi:10.1016/j.nucengdes.2006.01.007

Cited by 50 publications

(16 citation statements)

References 2 publications

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“…Log-linear relationships between the RMS sensor output voltage and the valve leak rate were empirically defined for both subcooled water and saturated steam. Lee et al (2006) took a similar approach to monitoring check valves for two types of failure: disk wear and foreign object intrusion. They developed linear relationships between the RMS output voltage and the leak rate dependent on the amount of disk wear or size of the foreign object.…”

Section: Valvesmentioning

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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Section: Valvesmentioning

confidence: 99%

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

Coble¹,

Ramuhalli²,

Bond³

et al. 2012

View full text Add to dashboard Cite

show abstract

“…This means that the physical components have little to fear from the stress and strain of thermal expansion as well as the process of oxidation. However, when higher temperature (>400 °C) capabilities are necessary, only a select few piezoelectric materials can make the cut [2][3][4][5][6][7][8]. The piezoelectric material must be combined with the right components from the casing, to the waveguide, to the coupling, to the matching layer, as well as the backing material and work together cohesively with a lead wire to produce the most consistent acoustic signals and data possible for their particular application.…”

Section: Introductionmentioning

confidence: 99%

Development of high temperature capable piezoelectric sensors

Suprock

Tittmann²

2017

AIP Conference Proceedings

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“…Therefore, those components need a unique inspection method to achieve high safety demands. Nuclear power plant components inspection by Guided wave inspection method is presented such as nuclear power plant valves [2], pipes [3][4][5] and steam generator tube [6]. Nuclear power plants are inspected regular schedule based maintenance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Interface Defects for Inaccessible Reactor Shrink Fit Nozzle Weld by Ultrasonic Wave

Lee

Cho

2017

Preprint

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An effective method to inspect inaccessible nuclear power facility by interface wave which propagate along the shrink fit boundary of reactor head is proposed in this study. Reactor head is relatively thick to inspect from the outside of reactor by conventional ultrasonic testing. The proposed interface wave can propagate a long distance from the fixed transducer position. The inside of nuclear reactor is limited to access due to the high radiation, so transducers are located at outside of nuclear facility and interface wave propagates into the nuclear reactor for defect detection. The numerical simulation and experiments were carried out to validate the effectiveness of the proposed interface wave inspection method. Various defect cases simulating field failures are also presented with satisfactory detectability by the proposed technique with the features for defect classification.

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A study of the characteristics of the acoustic emission signals for condition monitoring of check valves in nuclear power plants

Cited by 50 publications

References 2 publications

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

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

Development of high temperature capable piezoelectric sensors

Evaluation of Interface Defects for Inaccessible Reactor Shrink Fit Nozzle Weld by Ultrasonic Wave

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