Nuclear Power Plant NDE Challenges — Past, Present, and Future

Doctor, Steven R.

doi:10.1063/1.2717950

Cited by 14 publications

(20 citation statements)

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“…As existing DCSS systems continue to operate, some of them exceeding their designed life span, new degradation processes are being found. For these new degradation processes, the effectiveness of existing inspection and NDE tools is unknown [15]. Many inspections cannot be conducted effectively on a number of materials and configurations.…”

Section: Potential Work On Analytical Modelmentioning

confidence: 99%

Analytical Model of Nuclear Environmental Effects With Piezoelectric Wafer Active Sensors

Lin

Giurgiutiu

et al. 2014

Volume 6A: Materials and Fabrication

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The increasing number, size, and complexity of nuclear facilities deployed worldwide are increasing the need to maintain readiness and develop innovative sensing materials to monitor important to safety structures (ITS) for pipe and vessels (PVP) application. For example, nuclear dry cask storage system (DCSS) is a safety-critical facility in need of monitoring over prolonged periods of time. Technologies for the diagnosis and prognosis of PVP systems can improve verification of the health of the structure that can eventually reduce the likelihood of inadvertently failure of a component. The past two decades have witnessed an extensive sensor technology development using permanently installed piezoelectric wafer active sensors (PWAS) for structural health monitoring (SHM). PWAS have emerged as one of the major SHM technologies developed particularly for generating and receiving acousto-ultrasonic waves for the purpose of continuous monitoring and diagnosis. Durability and survivability of PWAS under nuclear environmental exposures has been tested preliminarily. However, the analytical model of PWAS based sensor and sensing system has not been developed with adequate solutions and guideline. This paper presents a study on an analytical model of nuclear environmental effects with PWAS. Environmental variability of a Nuclear-SHM system includes changes in both the sensors and the sensing methodology including acoustic emission (AE), guided ultrasonic waves (GUW), and electro-mechanical impedance spectroscopy (EMIS). We considered the environmental variability considers the effects of temperature changes and radiation. We superposed these changes on the analytical models and determined how much the structural sensing signals change is due to these environment effects for the DCSS system. The analytical modeling of various structural sensing methods to environmental disturbances was studied and the potential of PWAS as irradiation sensors for PVP applications was explored. The paper ends with conclusions and suggestions for further work.

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Section: Potential Work On Analytical Modelmentioning

confidence: 99%

Analytical Model of Nuclear Environmental Effects With Piezoelectric Wafer Active Sensors

Lin

Giurgiutiu

et al. 2014

Volume 6A: Materials and Fabrication

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“…Doctor [18,19] and Jarrell et al [20] have considered necessary advances of NDE in nuclear systems but in general this important area has not been extensively supported by the industry-another management issue.…”

Section: Inspection and Monitoringmentioning

confidence: 99%

Anatomy of Proactivity

Staehle¹

2010

Corrosion Reviews

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The subject of proactivity with respect to assuring the future safety, reliability, and economical operation of water-cooled nuclear plants is discussed. This subject is particularly important as these plants are expected to operate for possibly twice their present lives, and there is no experience with failures that might occur in the future for such reactor lifetimes.Proactive planning is the opposite of the reactive response in the past where failures were investigated after they had occurred and not predicted, as they could have been, before they occurred. Proactive research should be aimed at preventing or minimizing especially serious failures in materials and components before such failures occur. This present analysis of the "anatomy of proactivity" considers proactivity more comprehensively than early previous work on the subject. Predicting future failures needs to include considerations of failure modes, influence of management in causing failures, need for improved NDE to identify the initiation of future indications of failures, actions by individuals, and the importance of the organizations in nuclear power. This broader consideration is "comprehensive proactivity." It is the anatomy of this "comprehensive proactivity" that is discussed here.

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“…Some of the lessons learned from the current reactors in use indicated that the introduction and qualification of better joining processes along with the use of better NDE techniques and automation for data acquisition during fabrication would improve the NDE reliability and reduce the inspection frequency later in-service [1,2]. The automation of NDE processes can significantly increase the inspection speed, reduce operator fatigue, replace the operator at dangerous environments such as nuclear facilities and reduce the inspection cost.…”

Section: Introductionmentioning

confidence: 99%

Inspection of laser welds with array eddy current technique

Todorov

Nagy

Levesque

et al. 2013

AIP Conference Proceedings

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Three groups of laser weld specimens made of steel 316L for nuclear applications were fabricated -acceptable, missed seam (MS) and lack of penetration (LOP). An array eddy current technique was developed and investigated. The specimens top and bottom surfaces were scanned parallel and transverse to the weld line. The MS and LOP were easily imaged, detected and sized. Additional flaw indications were found in visually acceptable weld areas. Limited weld destructive testing was performed validating characteristic eddy current flaw indications.

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Nuclear Power Plant NDE Challenges — Past, Present, and Future

Cited by 14 publications

References 0 publications

Analytical Model of Nuclear Environmental Effects With Piezoelectric Wafer Active Sensors

Analytical Model of Nuclear Environmental Effects With Piezoelectric Wafer Active Sensors

Anatomy of Proactivity

Inspection of laser welds with array eddy current technique

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