干旱区生态环境知识资源中心(Arid): Feasibility of High Frequency Acoustic Imaging for Inspection of Containments: Phase II

Arid

DOI	10.2172/9288
报告编号	ORNL/NRC/LTR-99/11; ETC RPT:100546(U)
来源ID	OSTI_ID: 9288
	Feasibility of High Frequency Acoustic Imaging for Inspection of Containments: Phase II
	Rudzinsky, J.; Bondaryk, J.; Conti, M.
英文摘要	The nuclear power industry is concerned with corrosive thinning of portions of the metallic pressure boundary, particularly in areas that are not directly accessible for inspection. This study investigated the feasibility of detecting these thickness degradations using ultrasonic imaging. A commercial ultrasonic system was used to carry out several full-scale, controlled laboratory experiments. Measurements of 0.5 MHz shear wave levels propagated in 25-mm-thick steel plate embedded in concrete showed 1.4-1.6 dB of signal loss for each centimeter of two-way travel in the steel plate (compared to previous numerical predictions of 3-4 dB), and 1.3 dB of signal loss per centimeter of two-way travel in steel plates embedded in concrete prior to setting of the concrete (i.e., plastic). Negligible losses were measured in plates with a decoupling treatment applied between the steel and concrete to simulate the unbonded portions of the pressure boundary. Scattered signals from straight slots of different size and shape were investigated. The return from a 4-mm-deep rectangular slots exhibited levels 23 dB down relative to incidence and 4-6 dB higher than those obtained from both ''v'' shaped and rounded slots of similar depth. The system displayed an input/output dynamic range of 125 dB and measurement variability less than 1-2dB. Based on these results, a 4-mm-deep, rounded degradation embedded 30 cm in concrete has expected returns of -73dB relative to the input and should therefore be detectable. Results of this and a prior study indicate that the technique has merit and should be developed more fully and demonstrated in the field.
出版年	1999
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	42 ENGINEERING ; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS ; ULTRASONIC TESTING ; CONCRETES ; NUCLEAR POWER PLANTS ; PLATES ; STEELS ; THICKNESS ; ACOUSTIC DETECTION
URL	http://www.osti.gov/scitech/servlets/purl/9288
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/267851
推荐引用方式 GB/T 7714	Rudzinsky, J.,Bondaryk, J.,Conti, M.. Feasibility of High Frequency Acoustic Imaging for Inspection of Containments: Phase II,1999.