LASER-ULTRASONIC TESTING AND ITS APPLICATIONS TO NUCLEAR REACTOR INTERNALS

2008 ◽  
Author(s):  
M. Ochiai ◽  
T. Miura ◽  
S. Yamamoto ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
Ultrasonic Testing ◽  
Nuclear Reactor ◽  
Laser Ultrasonic ◽  
Reactor Internals

Ultrasound and Nonlinear Resonant Testing of Nuclear Reactor Internals Bolts

2011 ◽  
Author(s):  
S. W. Glass ◽  
B. Thigpen ◽  
J. Renshaw
Keyword(s):  
Phased Array ◽  
Nuclear Reactor ◽  
Structural Integrity ◽  
Cost Effective ◽  
Life Extension ◽  
Safe Operation ◽  
Plant Life ◽  
Nuclear Plants ◽  
Bolt Failure ◽  
Reactor Internals

As many nuclear plants approach the end of their initial 40 year license period, inspection or replacement of their reactor internals bolts must be considered. This is consistent with the Materials Reliability Program (MRP 227/228) guideline for plant life extension [1,2]. Assurance of the internals structural integrity is essential for continued safe operation of these plants. If there is no suspicion or indication of bolt failure, simple inspection is normally more cost-effective than replacement. Inspection vendors have inspected thousands of internals bolts with conventional and Phased Array UT but different head configurations and bolt capture mechanisms mandate specific qualifications for each bolt type. In some cases, complex bolt and head geometries coupled with counter-bore and locking bar interferences render classical UT inspections difficult or impossible. A range of solutions to inspect reactor internals including these difficult-to-inspect-by-conventional-UT baffle bolts has been developed by several vendors [3]. This presentation references developments to make bolt inspection a relatively quick and easy task through adaptations to the SUSI submarine inspection platform, the extensive UT qualification work suitable for conventional UT plus more recent advanced nonlinear resonant techniques to distinguish between flawed or loose, vs. acceptable bolts where conventional UT cannot be applied. Initial evaluations show that these advanced techniques may have the ability to reliably detect smaller flaws than previously possible with conventional techniques as well as provide information on bolt tightness.

scholarly journals Mid-IR laser ultrasonic testing for fiber reinforced plastics

2018 ◽  
Author(s):  
Masahiro Kusano ◽  
Hideki Hatano ◽  
Kanae Oguchi ◽  
Hisashi Yamawaki ◽  
Makoto Watanabe ◽  
...  
Keyword(s):  
Ultrasonic Testing ◽  
Fiber Reinforced ◽  
Laser Ultrasonic ◽  
Reinforced Plastics ◽  
Ir Laser ◽  
Fiber Reinforced Plastics

Depth Detection of a Thin Aluminum Plate in Laser Ultrasonic Testing Using a Confocal Fabry-Perot Laser Interferometer

2011 ◽  
Vol 59 (5(1)) ◽  
pp. 3262-3266 ◽  
Author(s):  
Seung-Kyu Park ◽  
Sung-Hoon Baik ◽  
Hyun-Kyu Jung ◽  
Yong-Moo Cheong ◽  
Byung-Heon Cha ◽  
...  
Keyword(s):  
Ultrasonic Testing ◽  
Laser Interferometer ◽  
Aluminum Plate ◽  
Laser Ultrasonic ◽  
Thin Aluminum ◽  
Fabry Perot ◽  
Depth Detection

Non-contact laser ultrasonic testing of steel-plumbum bonding structure

2018 ◽  
Vol 47 (1) ◽  
pp. 117006
Author(s):  
夏嘉斌 Xia Jiabin ◽  
孙广开 Sun Guangkai ◽  
宋潮 Song Chao ◽  
周正干 Zhou Zhenggan
Keyword(s):  
Ultrasonic Testing ◽  
Laser Ultrasonic ◽  
Bonding Structure

scholarly journals Detection of Internal Holes in Additive Manufactured Ti-6Al-4V Part Using Laser Ultrasonic Testing

2020 ◽  
Vol 10 (1) ◽  
pp. 365 ◽  
Author(s):  
Jie Yu ◽  
Dongqi Zhang ◽  
Hui Li ◽  
Changhui Song ◽  
Xin Zhou ◽  
...  
Keyword(s):  
Ultrasonic Testing ◽  
Laser Doppler Vibrometer ◽  
Laser Ultrasonic ◽  
Ultrasound Waves ◽  
Hole Defect ◽  
X Ray Computed ◽  
Hole Defects ◽  
Pulse Echo ◽  
The Relationship ◽  
Non Destructive

For a non-contact, non-destructive quality evaluation, laser ultrasonic testing (LUT) has received increasing attention in complex manufacturing processes, such as additive manufacturing (AM). This work assessed the LUT method for the inspection of internal hole defects in additive manufactured Ti-6Al-4V part. A Q-switched pulsed laser was utilized to generate ultrasound waves on the top surface of a Ti-6Al-4V alloy part, and a laser Doppler vibrometer (LDV) was utilized to detect the ultrasound waves. Sub-millimeter (0.8 mm diameter) internal hole defect was successfully detected by using the established LUT system in pulse-echo mode. The method achieved a relatively high resolution, suggesting significant application prospects in the non-destructive evaluation of AM part. The relationship between the diameter of the hole defects and the amplitude of the laser-generated Rayleigh waves was studied. X-ray computed tomography (XCT) was conducted to validate the results obtained from the LUT system.

Laser ultrasonic testing system using a confocal Fabry-Perot interferometer with a fringe stabilization module

2005 ◽  
Author(s):  
Sung-Hoon Baik ◽  
Seung-Kyu Park ◽  
Min-Suk Kim ◽  
Chang-Hwan Lim ◽  
Byung Heon Cha
Keyword(s):  
Ultrasonic Testing ◽  
Testing System ◽  
Laser Ultrasonic ◽  
Fabry Perot
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