Parametrical study of flaw detection in polycrystalline materials by reducing the multiple scattering contribution

Shahjahan, Sharfine; Aubry, Alexandre; Rupin, Fabienne; Chassignole, Bertrand; Derode, Arnaud

doi:10.1063/1.4789111

Cited by 1 publication

(1 citation statement)

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“…However, for PE pipe of large size used in NPP, current technology was unable to adequately detect defects. A similar problem was also encountered for steel piping when the existing ultrasonic testing technique was applied to inspect thick-walled weld bead (more than 50 mm in thickness) [39][40][41]. The coarse grains in the welding region of the steel pipe lead to big noise, high sound attenuation, and deviation of sound path.…”

Section: Defect Recognition and Safety Assessmentmentioning

confidence: 98%

A review of nondestructive examination technology for polyethylene pipe in nuclear power plant

et al. 2018

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Polyethylene (PE) pipe, particularly highdensity polyethylene (HDPE) pipe, has been successfully utilized to transport cooling water for both non-safety-and safety-related applications in nuclear power plant (NPP). Though ASME Code Case N755, which is the first code case related to NPP HDPE pipe, requires a thorough nondestructive examination (NDE) of HDPE joints. However, no executable regulations presently exist because of the lack of a feasible NDE technique for HDPE pipe in NPP. This work presents a review of current developments in NDE technology for both HDPE pipe in NPP with a diameter of less than 400 mm and that of a larger size. For the former category, phased array ultrasonic technique is proven effective for inspecting typical defects in HDPE pipe, and is thus used in Chinese national standards GB/T 29460 and GB/T 29461. A defectrecognition technique is developed based on pattern recognition, and a safety assessment principle is summarized from the database of destructive testing. On the other hand, recent research and practical studies reveal that in current ultrasonic-inspection technology, the absence of effective ultrasonic inspection for large size was lack of consideration of the viscoelasticity effect of PE on acoustic wave propagation in current ultrasonic inspection technology. Furthermore, main technical problems were analyzed in the paper to achieve an effective ultrasonic test method in accordance to the safety and efficiency requirements of related regulations and standards. Finally, the development trend and challenges of NDE test technology for HDPE in NPP are discussed.

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Section: Defect Recognition and Safety Assessmentmentioning

confidence: 98%