Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

The inner blend regions of some pressure vessel nozzles are examined ultrasonically from the outside surface of the nozzle or of the vessel. Design and interpretation of these examinations are complicated because of multiple curvatures of the inside and outside surfaces and because the sound beam must be oriented properly with respect to the flaw in order for an echo to be detected at the transducer. In a previous paper [1], the software system (WARay3D) for designing and verifying wedges to be used in detecting flaws in the inner blend region of nozzles by corner reflection or by normal incidence was discussed; see Figure 1. The present paper describes experimental validation of 3D geometric modeling of nozzles and pressure vessels and raytracing to compute and display sound paths of UT inspections. A series of experiments was conducted at the EPRI NDE Center on a 20-inch diameter BWR nozzle specimen containing six artificially-induced flaws. WARay3D was used to determine specific search unit positions, beam angles and skew angles for manual ultrasonic detection of each flaw from both sides. All flaws were detected from both sides with high signal-to-noise ratio and with close correlation between the predicted and actual search unit locations and metal paths.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

14A

Chapter

Chapter 4: Transducers, Sensors, and Process Control

Section

Ultrasonic Transducer Fields and Ray Tracing

Pages

1119-1126

DOI

10.1007/978-1-4615-1987-4_142

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Validation 3D Ray Tracing for UT Examination of the Nozzle Inner Blend Region

Snowmass Village, CO

The inner blend regions of some pressure vessel nozzles are examined ultrasonically from the outside surface of the nozzle or of the vessel. Design and interpretation of these examinations are complicated because of multiple curvatures of the inside and outside surfaces and because the sound beam must be oriented properly with respect to the flaw in order for an echo to be detected at the transducer. In a previous paper [1], the software system (WARay3D) for designing and verifying wedges to be used in detecting flaws in the inner blend region of nozzles by corner reflection or by normal incidence was discussed; see Figure 1. The present paper describes experimental validation of 3D geometric modeling of nozzles and pressure vessels and raytracing to compute and display sound paths of UT inspections. A series of experiments was conducted at the EPRI NDE Center on a 20-inch diameter BWR nozzle specimen containing six artificially-induced flaws. WARay3D was used to determine specific search unit positions, beam angles and skew angles for manual ultrasonic detection of each flaw from both sides. All flaws were detected from both sides with high signal-to-noise ratio and with close correlation between the predicted and actual search unit locations and metal paths.