摘要:

Ultrasonic NDE is one of important technologies in the life‐time maintenance of nuclear power plant. Ultrasonic inspection system is consisted of the operator, equipment and procedure. The reliability of ultrasonic inspection system is affected by its ability. The performance demonstration round robin was conducted to quantify the capability of ultrasonic inspection for in‐service. The small number of teams who employed procedures that met or exceeded ASME Sec. XI Code requirements detected the piping of nuclear power plant with various cracks to evaluate the capability of detection and sizing. In this paper, the statistical reliability assessment of ultrasonic nondestructive inspection data using Monte Carlo simulation is presented. The results of the probability of detection (POD) analysis using Monte Carlo simulation are compared to these of logistic probability model. In these results, Monte Carlo simulation was found to be very useful to the reliability assessment for the small NDE hit/miss data sets. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1570354

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

This paper describes the application of case‐based reasoning (CBR) to provide decision support for the NDT engineer during Inspection Qualification. A key element of this process is to present experimental evidence on the effectiveness of the inspection. A prototype for the system has been developed using a case‐base which describes the defect, the probe and response. This paper discusses the motivation for the system, the case structure, weightings, similarity measures, retrieval techniques and its design and implementation. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1570355

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

Multizone Inspection (MZI) is an ultrasonic inspection system that has been developed in response to FAA recommendations for improved inspection of titanium billet material. The system is capable of achieving &mesh;2 FBH sensitivity in billets up to 10 inches in diameter. Honeywell as well as other OEMs are interested in adopting this inspection technique in response to FAA recommendations and to improve the sensitivity of their inspection procedures. To achieve that goal an evaluation of the system capability and variability at the supply base is necessary. This paper summarizes the results of a round robin study conducted at the supply base to evaluate the variability of MZI for 8 inch‐diameter Ti‐6Al‐4V. It was found that on the average there is about 27&percent; amplitude variability and 38&percent; Signal‐to‐Noise Ratio (SNR) variability at each surveyed facility. It was also found that the variability from one facility to the other was on the average about 28&percent; in amplitude and 30&percent; in SNR. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1570356

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

Theoretical modelling programs are used to validate test procedures during Inspection Qualification and to aid interpretation of results. “Flags” occur when the models run outside their range of validity and warn the user of possible inaccuracies in predictions. However, in order to interpret these flags significant expertise in the theoretical background to the models is required by the user. This paper describes why these flags occur and the automated steps that can be taken to extract useful predictions when they do, thus simplifying the modelling procedure. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1570357

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

The demonstration of ultrasonic inspection reliability through Inspection Qualification is important for non‐routine or safety critical tests. However, since Inspection Qualification is time consuming and costly, the provision of interactive software tools to aid the process offers substantial advantages. This paper describes such an interactive tool set to aid Inspection Qualification. Operating within a 3D CAD environment it consists of ray tracing, coverage map and defect/ray interaction tools. Initial ray amplitudes are also calculated and displayed, and estimation of favorable surface scanning positions determined. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1570358

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

Fracture critical rocket hardware requires nondestructive testing for flight quality assurance. Fracture critical hardware is defined as hardware with failure modes that may endanger space systems, missions or crew. This hardware includes major housings, disks, impellers and gas path hardware. A number of these components are evaluated with fluorescent penetrant inspection for defects open to the surface. Industry data supports the conclusion that with ultra high sensitivity penetrant, defects > 0.090″ in length can reliably be detected with a 90/95 probability of detection (POD). To ensure the same POD on fracture critical hardware with reject lengths < 0.090″, POD demonstrations are conducted. These demonstrations are conducted on in‐house inspectors and on approved external vendor’s inspectors. Included in this paper are the results from over 50 of these demonstrations including results from different levels, methods and manufactures of penetrant. The paper describes: the specimens used, process used, specimen cleaning method, types of systems tested, analysis method, problem encountered and the lessons and conclusions that can be made. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1570359

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

The development of NDT related educational materials has been the focus of the North Central Collaboration for NDT Education for the past four years. The Collaboration was started as a National Science Foundation (NSF) Advanced Technology Education (ATE) program and united a number of community colleges and Iowa State University. The Collaboration developed advanced teaching methods and new materials that have allowed students to learn NDT concepts better and in less time. These materials have been made available over the Internet and have been well received. The Collaboration has recently received a second NSF ATE grant to develop an Internet site that will serve as a national focal point for NDT. In this phase of activities, the collaboration will develop a coordinated, multi‐level approach that 1) promotes NDT as a career field to students, teachers and counselors in junior and senior high schools, 2) serves as an educational resource for students and instructors of two‐year NDT programs and their graduates who are working in the industry, and 3) supplies educational materials that will allow educators in other technology programs (such as manufacturing and welding) to introduce their students to NDT methods. This paper will review the current activities of the Collaboration. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1570360

出版商:AIP    

年代:1903

数据来源: AIP