Stainless steel piping used in the construction of nuclear power plants is susceptible to cracking in the form of intergranular stress corrosion cracking (IGSCC). Cracking can impair pipe structural integrity, thus ultrasonic inspections are carried out on a regular and scheduled basis. Once a crack has been detected during the course of an inspection, that crack must be properly sized in order to determine the integrity of the pipe section under examination. The morphology of IGSCC is radically different than that of a fatigue crack and traditional sizing methods have been shown to need substantial revision and development in order to yield satisfactory results. The EPRI has undertaken a substantial program in this regard. The goals of this program are many, among to produce techniques that yield accurate and reliable indications of size, and advance automated sizing, due to the high radiation environment that is often encountered. Several methods have been and are being researched. As part of this overall funding program the utility of low frequency ultrasonic sizing was explored. Low frequency, wide aperature ultrasound offers many advantages for sizing and the results of this research is encouraging, and when used in conjunction with other complimentary techniques can yield accurate measurements of crack size.
|Original language||English (US)|
|Title of host publication||Unknown Host Publication Title|
|Publisher||Int Committee on Nondestructive Testing|
|Number of pages||7|
|State||Published - Dec 1 1985|
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