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Full-Text Articles in Nuclear Engineering

The Effects Of A Mandatory Early Shutdown Of Maine Yankee, Maine State Planning Office Sep 1987

The Effects Of A Mandatory Early Shutdown Of Maine Yankee, Maine State Planning Office

Maine Collection

The Effects of a Mandatory Early Shutdown of Maine Yankee

Maine State Planning Office - Richard Silkman, Director (September 1987).

Contents: Introduction / Legal Issues / Economic Issues / Health and Environmental Issues / Conclusions / Appendices


Disposal Of Spent Nuclear Fuel And High-Level Waste: Design And Technical/Economic Analysis , Jordi Roglans-Ribas Jan 1987

Disposal Of Spent Nuclear Fuel And High-Level Waste: Design And Technical/Economic Analysis , Jordi Roglans-Ribas

Retrospective Theses and Dissertations

An economic model for the back end of the nuclear fuel cycle was developed for a once-through cycle, a standard reprocessing cycle, and a reprocessing cycle with fractionation of cesium and strontium. The development of the model was performed under the expected political constraints and scenario for the first nuclear waste repository. Technical issues concerning the repository design were analyzed, in particular the thermal design. A parametric thermal analysis was performed for waste emplaced in five different geologic formations: salt, granite, basalt, shallow tuff, and deep tuff. The results of the thermal analysis, in the form of maximum permissible loadings ...


Development Of Two-Group, Two-Dimensional, Frequency Dependent Detector Adjoint Function Based On The Nodal Method , Soli T. Khericha Jan 1987

Development Of Two-Group, Two-Dimensional, Frequency Dependent Detector Adjoint Function Based On The Nodal Method , Soli T. Khericha

Retrospective Theses and Dissertations

A concept of local/global components, based on the frequency dependent detector adjoint function, and a nodalization technique was utilized in the development of one- and two- dimensional computer codes to calculate the response of a detector to a vibrating absorber in reactor cores. The frequency dependent detector adjoint functions presented by complex equations were expanded into real and imaginary parts. In the nodalization technique, the flux is expanded into polynomials about the center point of each node;The phase angles and the magnitudes of the two-energy group detector adjoint functions were calculated for a neutron detector located in the ...


Nde Characterization Of Metallic Interfaces, D. D. Palmer, David K. Rehbein, J. F. Smith, Otto Buck Jan 1987

Nde Characterization Of Metallic Interfaces, D. D. Palmer, David K. Rehbein, J. F. Smith, Otto Buck

Review of Progress in Quantitative Nondestructive Evaluation

In recent years, the process of diffusion bonding has found considerable usage in the aerospace and nuclear power industries [1]. This process entails two surfaces being pressed together at elevated temperatures and high pressures. If ideal conditions are achieved, the bonded interface will have properties identical to those of the matrix metal and the microstructure will be continuous across the interface. There is a fine margin for error in attaining ideal conditions and the ability to characterize the bond nondestructively is highly desirable. The present project is aimed at the development of ultrasonic techniques for the characterization of interfaces between ...


Materials Characterization By Ultrasonic Attenuation Spectral Analysis, R. L. Smith Jan 1987

Materials Characterization By Ultrasonic Attenuation Spectral Analysis, R. L. Smith

Review of Progress in Quantitative Nondestructive Evaluation

The use of ultrasonic techniques for the characterization of microstructural features has attracted much attention in recent years. Although the measurement of ultrasonic parameters has been used for determining material properties for many years, but with the advent of modern signal processing techniques it is possible to extract significantly more information from ultrasonic signals. This has lead to numerous studies being carried out on the effect of microstructures on the propagation of ultrasonic waves and their application to monitoring properties of industrial significance. Examples include the determination of grain size, degree of porosity, amount of second phase particles and measurement ...


Uk Developments In Theoretical Modeling For Ndt, Andrew Temple Jan 1987

Uk Developments In Theoretical Modeling For Ndt, Andrew Temple

Review of Progress in Quantitative Nondestructive Evaluation

Non-destructive inspection is widely used to ensure that engineering structures such as railway rails, bridges, nuclear reactor pressure vessels, offshore oil platforms, airplane airframes and so on contain no unacceptably large defects. Such defects, if they were present in the structures, could cause failure under certain applied loads. Generally, the most serious defects are cracks which occur during manufacture, either in castings or in welds, or during service due to cyclic loads and environmental attack. The non-destructive inspections are carefully designed to be capable of detecting these crack-like defects. I am concerned here only with ultrasonic inspection techniques and consider ...


An Efficient Technique For Storing Eddy Current Signals, S. S. Udpa Jan 1987

An Efficient Technique For Storing Eddy Current Signals, S. S. Udpa

Review of Progress in Quantitative Nondestructive Evaluation

Preventive maintenance schemes often involve periodic inspection of plant and equipment in industry. Evaluation of the integrity of the plant at regular intervals provides data not only for the detection of defects in their incipient stages but also for monitoring the evolution in the growth of defects that were considered benign in previous inspections. Evolution in the nature of defects is tracked by comparing the signals obtained with test data obtained and recorded from previous tests. Consequently the procedure entails storage of a large amount of data during each inspection. As an example, the Nuclear Regulatory Commission mandates periodic inspection ...


Status Of Advanced Ut Systems For The Nuclear Industry, M. Behravesh, M. Avioli, G. Dau, S.-N. Liu Jan 1987

Status Of Advanced Ut Systems For The Nuclear Industry, M. Behravesh, M. Avioli, G. Dau, S.-N. Liu

Review of Progress in Quantitative Nondestructive Evaluation

An advanced ultrasonic testing (UT) system is a configuration of hardware that includes some type of computer. The computer may be hardwired to perform specific functions or have appropriate software. It may typically be used for data acquisition, signal processing, image generation, pattern recognition and data analysis. Additionally, advanced systems have data storage and are, therefore, different from the standard transducer-pulser/receiver systems that rely on human filtering and written documentation of the filtered data.


Applications Of Film Tomography Technique For Qnde, A. Notea Jan 1987

Applications Of Film Tomography Technique For Qnde, A. Notea

Review of Progress in Quantitative Nondestructive Evaluation

Tomography with X- and gamma- rays provides three-dimensional radiographic information on the examined object. The film-based tomography (1,2) generates a summation-image of a surface within the object by continuously combining back projections directly on the film. This method has many attractive features for industrial applications in which cost and simplicity are of primary importance. Some of the features are: (1) The absence of post processing allows this method to yield an image immediately on development of the film.; (2) Conventional radiologists need a short training time to master the technique as most components and concepts are familiar to them ...


Photon Ct Scanning Of Advanced Ceramic Materials, B. D. Sawicka, W. A. Ellingson Jan 1987

Photon Ct Scanning Of Advanced Ceramic Materials, B. D. Sawicka, W. A. Ellingson

Review of Progress in Quantitative Nondestructive Evaluation

Advanced ceramic materials (e. g. Si3N4, ZrO2, SiC, A12O3) are being developed for high temperature applications in advanced heat engines and high temperature heat recovery systems [1]. Although fracture toughness has been a constant problem, advanced ceramics are now being developed with fracture toughnesses close to those of metals [2]. Small size flaws (10–200 μm), small non-uniformities in density distributions (0.1–2%) present as long-range density gradients, and porous regions which can be seen as localized areas of slightly lower density, are critical in most ceramics. The need to detect these small flaws is causing a significant effort ...


On The Ultrasonic Imaging Of Tube/Support Structure Of Power Plant Steam Generators, Jafar Saniie, Daniel T. Nagle Jan 1987

On The Ultrasonic Imaging Of Tube/Support Structure Of Power Plant Steam Generators, Jafar Saniie, Daniel T. Nagle

Review of Progress in Quantitative Nondestructive Evaluation

The corrosion and erosion of steam generator tubing in nuclear power plants can present problems of both safety and economics. In steam generators, the inconel tubes are fit loosely through holes drilled in carbon steel support plates. Corrosion is of particular concern with such tube/support plate structures. Non-protective magnetite can build up on the inner surface of the support plate holes, and allowed to continue unchecked, will fill the gap, eventually denting and fracturing the tube walls. Therefore, periodic nondestructive inspection can be valuable in characterizing corrosion and can be used in evaluating the effectiveness of chemical treatments used ...


A Real-Time Saft System Applied To The Ultrasonic Inspection Of Nuclear Reactor Components, T. E. Hall, S. R. Doctor, L. D. Reid Jan 1987

A Real-Time Saft System Applied To The Ultrasonic Inspection Of Nuclear Reactor Components, T. E. Hall, S. R. Doctor, L. D. Reid

Review of Progress in Quantitative Nondestructive Evaluation

In 1982 Pacific Northwest Laboratory began activity under the sponsorship of the U.S. Nuclear Regulatory Commission to implement SAFT technology in a field usable system. The University of Michigan had previously laid the groundwork by performing extensive research related to the development of the SAFT algorithm in the area of ultrasonics and the investigation of ways to improve the computation time [1,2]. The task given PNL was to deploy the results of this research effort by developing an instrument that would perform in-service inspection of nuclear reactor components using the SAFT-UT algorithm.


Image Processing And Artificial Intelligence For Detection And Interpretation Of Ultrasonic Test Signals, Keith S. Pickens, John C. Lusth, Pamela K. Fink, Karol K. Palmer, Earnest A. Franke Jan 1987

Image Processing And Artificial Intelligence For Detection And Interpretation Of Ultrasonic Test Signals, Keith S. Pickens, John C. Lusth, Pamela K. Fink, Karol K. Palmer, Earnest A. Franke

Review of Progress in Quantitative Nondestructive Evaluation

Detection of flaws is an important industrial concern. For example, aircraft and nuclear-power reactor owners and regulatory authorities need effective means of detecting flaws that could pose a threat to public safety. Operators of costly equipment require information on service-induced flaws to be able to make run-or-retire decisions. As the cost of parts and concerns for public safety increase, the importance of flaw detection and size estimation has likewise escalated.


A Three-Dimensional Nodal Solution For The Frequency Dependent Neutron Diffusion Equation , Abdulghani M. Melaibari Jan 1987

A Three-Dimensional Nodal Solution For The Frequency Dependent Neutron Diffusion Equation , Abdulghani M. Melaibari

Retrospective Theses and Dissertations

This research involves the development of a three-dimensional nodal code that calculates the Fourier transformed regular or adjoint neutron flux for a nuclear reactor. This numerical technique can be used in the nuclear reactor noise analysis field for identifying and locating vibrating reactor core components;The mathematical equations were developed and two types of solutions were obtained. The first solution was a modification of a three-dimensional nodal model developed to handle multigroup neutron diffusion equations. In this model, the Fourier transformed fluxes were expanded in the Legendre polynomial form. The second is an analytical procedure developed for a simple geometry ...