Effect of temperature on the load bearing capacity of glued-in rods
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Effect of Weld Residual Stress Fitting on Stress Intensity Factor for Circumferential Surface Cracks in Pipe
Recent studies have shown that the crack growth of PWSCC is mainly driven by the weld residual stress (WRS) within the dissimilar metal weld. The existing stress intensity factor (K) solutions for surface cracks in pipe typically require a 4th order polynomial stress distribution through the pipe wall thickness. Howev…
Effect of Pre-Strain on Mechanical Properties of Pressure Vessel Grades: Assessment of Stress Relieving/Post Weld Heat Treatments Efficiency at Regenerating Properties
During fabrication of large pressure vessels, thick plates are submitted to numerous process phases that may affect the initial (i.e. as delivered) properties of the material. Regarding the advantages (both technical and economical) of cold forming process, this technique is largely preferred and widely spread. Modern…
Effect of fit checking materials and subsequent cleaning methods on the contact angle of luting agents – a pilot study
Fit checking materials applied on ceramic and metallic surfaces alter the surface characteristics. This altered restorative surface affects the wetting properties, thereby increasing the contact angle of luting agents. Therefore the residual film of fit indicating materials should be cleaned from the restorative surfa…
Development of Elastic-Plastic Constitutive Models for the Evaluation of Nuclear Piping Systems Under Severe Cyclic Loading
It is essential to predict the behavior of nuclear piping system under seismic loading to evaluate the structural integrity of nuclear power plants. Relatively large stress cycles may be applied to the piping systems under severe seismic loading and plastic deformation may occur cyclically in some portion of the syste…
Electrochemical Properties of 304 Stainless Steel Under Proportional and Non-Proportional Multiaxial Loading Condition
Corrosion fatigue tests and electrochemical tests under proportional and non-proportional loading conditions were conducted on 304 stainless steel in 0.63 mol/L sodium chloride solution at the room temperature. Two biaxial loading paths were applied to study the effect of proportional and nonproportional loadings on p…
Investigation and Resolution of Columbus Cabin Fan Assembly Anomalies
Columbus fans performance degradation has been monitored for more than two years. Different activities were performed in 2010-2011 timeframe in order to mitigate dust accumulation in the air loop. Inter-Module Ventilation (IMV) Return Fan Assembly (IRFA) has been kept switched off since the end of 2009 (save for testi…
Microfibrous Entrapped Catalysts for Cleaning Aircraft Cabin Air: VOC Removal at Ultra-Short Short Contact Times
Purification of breathing air in an aircraft cabin is important to ensure the safety and the comfort for both passengers and airline personnel. Among various molecular contaminants, volatile organic compounds (VOCs) are an important class of contaminants that need purification. Therefore, catalytic removal of VOCs (us…
Fitness-for-Service Assessment of a Steam Pipeline Operating in the Creep Range After 230000 Hours of Service
High energy pipes, carrying steam at high pressure and temperature, are very common in the industry. In this paper, a Fitness-For-Service assessment was performed for a pipeline connecting the boiler of a paper mill to the cogeneration turbine and the process headers. A pressure of 6.4 MPa and a temperature of 475 °C…
An Overview of Risk Management Planning for Hot-Isostatic Pressure Treatment of High-Level Waste Calcine for the Idaho Cleanup Project
The Calcine Disposition Project (CDP) of the Idaho Cleanup Project (ICP) has the responsibility to retrieve, treat, and dispose of the calcine stored at the Idaho Nuclear Technology and Engineering Center (INTEC) located at the Idaho National Laboratory. Calcine is the granular product of thermally treating, or calcin…
Elastic-Plastic Fracture Mechanics Analysis of Cast Stainless Steel Pipes (Comparison of Z-Factor, Two-Parameter and J-T Methods)
Since the ductility of cast austenitic stainless steel pipes decreases due to thermal aging embrittlement after long term operation, not only plastic collapse failure but also unstable ductile crack propagation (elastic-plastic failure) should be taken into account for the structural integrity assessment of a cracked…
A Method to Characterize the Fracture Resistance of Dissimilar Metal Welds
Characterization of the fracture resistance of weld joints, and in particular dissimilar metal welds (DMW), is a huge and difficult work where no standard currently exists. As a consequence, characterizations of materials have to be done prior to the fracture tests in order to consider the mechanical aspects of the ma…
Grain Boundary Graphitization in P1 (C-1/2Mo) Alloy Pipe
Failure analysis performed on SA-335, Grade P1, Carbon-1/2Molybdenum (P1) steel pipe confirmed that failure in cold-formed bends was due to graphitization, but revealed that the graphite had developed in the affected material in a manner that has received little attention in the technical literature. In particular, th…
The Sealing Characteristics of Bolted Flanged Connection With Metal Gasket
Metal gaskets have been used in bolted flanged connections under high pressure and high temperature conditions. However, it is difficult to estimate an amount of leakage from the metal contact interfaces in the connections. Recently, it has been noticed that a tiny leakage occurs from the gasket interfaces in bolted f…
Multilayer Urea Reactor Safety Evaluation Based on Acoustic Emission Examination
Safety evaluation of urea reactors containing defects was studied based on acoustic emission examination and subsequent dissection. First, acoustic emission examination was conducted in the process of pressure testing during the hydro test and the existed defects of the urea reactor were detected and comprehensively e…
Hot Isostatic Pressing of Hardfacing and Stainless Steel Powders for PWR Components: Materials and Manufacturing Benefits
Hot Isostatic Pressing (HIP) has been used for many years to consolidate porosity in cast metal shapes to improve mechanical properties. When applied to fine metal powders, it is possible to produce Near Net Shape (NNS) items and more complex geometry components that are fully dense and offer an attractive set of prop…
Failure Probability Assessment for a Boiling Water Reactor Pressure Vessel Under Low Temperature Over-Pressure Event
The fracture probability of a boiling water reactor pressure vessel for a domestic nuclear power plant in Taiwan has been numerically analyzed using an advanced version of ORNL’s FAVOR code. First, a model of the vessel beltline region, which includes all shell welds and plates, is built for the FAVOR code based on th…
Characterization of vacancy-type defects in heteroepitaxial GaN grown by low-energy plasma-enhanced vapor phase epitaxy
The defect concentration in thin GaN layers was estimated by means of positron annihilation spectroscopy. Positron lifetime and Doppler broadening of the annihilation radiation were used. A comparative study of GaN films grown with different techniques was performed. Specific attention has been given to the new low en…
Wavelet Analysis of Flexural Wave Fronts in Water/Slurry Hammer
The present study experimentally analyzes flexural wave fronts in water hammer and slurry hammer with polycarbonate tubes by wavelet analysis. The water/slurry hammer was initiated by the impact between the free-falling projectile and the water/slurry in the vertical mounting tube. We measured hoop strain histories of…
Benchmark Campaign on the Uncertainty Treatment Analysis Tools Developed for French Nuclear Reactor Pressure Vessels Integrity Assessment
In France, nuclear reactor pressure vessels (RPV) integrity assessment follows a deterministic methodology and is performed according to the 1999 French regulation requirements with the use of safety coefficients. In the deterministic methodology, the input data are penalized in order to address the uncertainties. EDF…