Download or read book Deposition of Magnetite Particles Onto Alloy 800 Steam Generator Tubes written by Marc Basset and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Deposition of Magnetite Particles Onto Alloy 800 Steam Generator Tubes microform written by Marc Basset and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1998 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A study of magnetite particle deposition onto alloy 800 and alloy 600 between 25 and 85 degrees c and predicted rates under steam generator operating conditions written by C. W. Turner and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Steam Generator Sludge Deposition in Recirculating and Once Through Steam Generator Upper Tube Bundle and Support Plates written by Ronald L. Baker and published by . This book was released on 1992 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Steam Generators for Nuclear Power Plants written by Jovica Riznic and published by Woodhead Publishing. This book was released on 2017-05-24 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam Generators for Nuclear Power Plants examines all phases of the lifecycle of nuclear steam generators (NSGs), components which are essential for the efficient and safe operation of light water reactors (LWRs). Coverage spans the design, manufacturing, operation and maintenance, fitness-for-service, and long-term operation of these key reactor parts. Part One opens with a chapter that provides fundamental background on NSG engineering and operational experiences. Following chapters review the different NSG concepts, describe NSG design and manufacturing, and consider the particularities of SGs for VVER reactors. Part Two focuses on NSG operation and maintenance, starting with an overview of the activities required to support reliable and safe operation. The discussion then moves on to tubing vibration, followed by the water and steam cycle chemistry issues relevant to the NSG lifecycle. Finally, a number of chapters focus on the key issue of corrosion in NSGs from different angles. This book serves as a timely resource for professionals involved in all phases of the NSG lifecycle, from design, manufacturing, operation and maintenance, to fitness-for-service and long-term operation. It is also intended as a valuable resource for students and researchers interested in a range of topics relating to NSG lifecycle management. - Fulfills the need for a detailed reference on steam generators for nuclear power plants - Contains comprehensive coverage of all phases of the nuclear steam generator lifecycle, from design, manufacturing, operation and maintenance, to fitness-for-service and long-term operation in one convenient volume - Presents contributions from key manufacturers and research institutes and universities

Download or read book Le D p t Et L enl vement de Particules de Magn tite de L ordre Du Sous micron la Surface de L alliage 800 written by Turner, Carl William and published by Chalk River, Ont. : System Chemistry and Corrosion Branch, Chalk River Laboratories. This book was released on 1994 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling Magnetite Particle Deposition in Nuclear Steam Generators and Comparisons with Plant Data written by Carver, M. B and published by Chalk River, Ont. : System Chemistry and Corrosion Branch, Chalk River Laboratories. This book was released on 1994 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The deposition and removal of sub micron particles of magnetite at the surface of alloy 800 written by C. W. Turner and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An investigation of magnetite deposition and its influence on heat transfer in steam generator tubes written by D. Thomas and published by . This book was released on 1974 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Chemical Additives on the Deposition of Magnetite Onto Alloy 800 Under Nucleate Boiling Heat Transfer written by Cyprien Gasnier and published by . This book was released on 2014 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis investigates the effects of three polymeric dispersants – two types of polyacrylic acid (PAA) and sodium polymethacrylate (PMA) – and a commercial filmforming amine (FFA) on the deposition onto heated nickel alloy of particulate magnetite from suspension in water during sub-cooled boiling and bulk boiling. In bench-top experiments, ribbons of Nichrome immersed in a magnetite suspension are heated electrically with and without additives. Results show that deposits are less numerous in the presence of polymeric additive. The smaller molecular weight PAA is the most effective at preventing magnetite deposition. Complementary experiments are carried out in a recirculating loop with an electrically-heated heat-exchanger tube of Alloy-800. The tube is exposed to flowing water under chemistry conditions comparable to those used during bench-top experiments. A laser profilometer is used to measure the thickness of the deposited magnetite at the end of each run. The use of polymeric dispersant is efficient at mitigating magnetite deposition. Again, the smaller molecular weight PAA is the most effective. A numerical model is developed to assist in the interpretation of the results from the laser profilometer. Due to its agglomerating effect on magnetite, one can conclude little about the effect of FFA on magnetite deposition."--Page ii.

Download or read book The Deposition of Magnetite Particles from High Velocity Water Onto Isothermal Tubes written by Burrill, K. A and published by Chalk River, Ont. : Chalk River Nuclear Laboratories. This book was released on 1977 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress corrosion cracking of alloy 800 tubing written by G. Ogundele and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simple empirical model of activity and crud transport in the candu hts has been developed and its utility illustrated using station data. the model emphasizes the fundamental role played by the out-of-core deposits. the input parameters required by the model can be obtained from data from station artefact characterizations, radiation field measurements and oxi-probe measurements and single-tube decontaminations. the details of the model are illustrated using the "simple" example of 95zr transport, which is transported mainly as particles. the more challenging case of 60co transport is then used to highlight additional aspects of the model and to point out some of the areas where further work is required. the model provides insights into the effectiveness of the candu purification system. it has allowed order of magnitude estimates to be made of the effective deposition half-lives for radionuclide removal by the hts deposits; in particular: ? t1/2 (95zr) = 10 - 98 h ? t1/2 (60co) = 7 -62 min typical candu purification half-lives range from 50 minutes to several hours. this is short enough to compete effectively with hts surfaces for 95zr removal. at the highest flow rates, the one-hour half-life is short enough to have a measurable impact on 60co deposition; at longer purification half-lives, the impact on 60co deposition is likely small. it should be noted that 95zr is transported and deposited mainly as particles, while 60co is deposited mainly as a dissolved species. further work is required to determine if these half-lives can be generalized to all particulate and dissolved species. the model leads to an estimate for the efficiency of the main hts system for the removal of the different radionuclides from the circulating coolant. for 60co, this removal efficiency is in the range 0.28 to 2.5%. in most discussions of the purification system effectiveness, an implicit assumption has been that the hts deposits were highly efficient in removing dissolved species from the coolant. these values illustrate the error of that assumption. while the purification system receives only a very small flow compared to the steam generators (on the order of 0.1%), it is highly efficient (95 -100%). the main hts loop receives 99.9% of the flow, but is inefficient (on the order of 1%). the net result is that the two removal mechanisms are more closely matched than previously assumed. the pseudo-efficiency provides a link between this model and more mechanistic treatments of activity deposition. the hts deposit "full flow purification system" can be broken into components: outlet feeders, steam generators, inlet feeders. the utility of this sub-division has been demonstrated by calculating the effect of removing the steam generator deposits by decontamination on reactor face fields in the year immediately following the decontamination. the predicted factor of 3.0 increase in 60co deposition at the reactor face compares favourably with the increase observed at gentilly-2 after the siva-blast of a factor of 2.8. refinements to the model should enable the pseudo-efficiencies to be linked to hts parameters such as the iron deposition profile, information on the affinity of radionuclides for magnetite and for the outlet end-fittings, feeders and hot leg of the steam generator tubes where the deposits are much thinner, plus various geometric considerations (surface areas, diameters, fluid velocities) via more mechanistic models. some deficiencies in the existing station data were identified during the application of the model to 95zr and 60co. a series of measurements is recommended to obtain the data required to assess the model; in particular: ? develop a good set of deposition constants for all radionuclides of interest (especially 60co, 124sb and 95zr/95nb) including the contributions of dissolved and particulate species. ? develop a good set of purification system removal constants for all radionuclides of interest, including the contributions from dissolved and particulate species ? determine c, the coolant concentration, for all species of interest, including dissolved and particulate species.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1982 with total page 1288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book DEPOSITION OF MAGNETITE PARTICLES FROM HIGH VELOCITY WATER ON TO ISOTHERMAL TUBES written by Atomic Energy of Canada Limited and published by . This book was released on 1974 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Deposition of Magnetite in High Temperature Boiler Environments written by Balaji Raman and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Suspended magnetite particles in boiler water may deposit in lower orifice headers in forced circulation boilers, impeding flow and causing inefficiencies, ultimately leading to overheating boiler tube failures. The surface charge and zeta potential developed by the suspended particles could be a driving factor in this process. To study the mechanism behind the deposition of suspended magnetite on stainless steel, laboratory-scale experiments were carried out under a range of standard boiler water chemistry, simulating fouling experienced in boiler units. A high-temperaturehigh-pressure electrophoretic deposition cell with provisions to test deposition on metal substrates has been developed. The trends in the deposition processes for the various chemistry were validated using visual observations, surface microscopy, and in situ electrochemical impedance spectroscopy (EIS). A three-electrode assembly design was developed to carry out the in situ electrochemical measurements in various boiler water environments. The experimental setup was successfully used to test boiler water chemistry at 300C (572F) and 10 MPa (1450 psi). The chemistry tested included all-volatile treatment (AVT; oxidizing and reducing using hydrazine), caustic treatment (CT), phosphate treatment (PT), and a filming amine (GE HRSG-02). In addition, the effect of particle size on the deposition process was studied. The experimental results have been explained using established principles of suspended oxide behavior in aqueous environments. The results indicated that the presence of suspended magnetite particles at a pH25C = 9.3, controlled by ammonium hydroxide, caused the particles to aggressively deposit on the stainless steel surface. On the other end of the AVT spectrum, when tested at pH25C = 9.8, no visually observable deposits were found on the surface of the steel. Operating close to the point of zero charge of magnetite at 300 C resulted in deposition and moving away from the point of zero charge mitigated deposition. In case of the caustic treatment and phosphate treatment, it was seen that the compression of the double layer due to the additional electrolytes in the system could influence the deposition process even when the pH of the system was away from the point of zero charge of magnetite at 300C. No significant influence of hydrazine was observed on the deposition of magnetite. Impedance spectroscopy was successfully used in these tests to identify in situ the cases where deposition occurred. The filming amine chemistry did not mitigate deposition completely, but the presence of the HRSG-02 affected the nature of deposits observed on the substrate. Macroscopically the substrate appeared to be covered with deposits and some darker regions. The results of the filming amine study point to possible interactions between the amine-substrate and amine-magnetite. Increasing the particle size distribution clearly showed a decrease in the deposition even though the boiler water chemistry was conducive for deposition. Although, controlling the particle size is not an option for utility boilers, these tests provide further insight into understanding deposition at high temperatures in boiler type environments. In addition to experimental results, the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory has been used to model the behavior of the suspended particles under the AVT boiler water chemistry regime. The DLVO interaction energy curves and the calculated agglomeration probabilities support the experimental observations regarding the deposition of magnetite under the AVT regime. Such calculations can be extended to other treatment chemistries as well providing means to predict the behavior of suspended particles in boiler water. In summary, this study has clearly established a link between the solution chemistry at 300 C (572 F) to the deposition of magnetite on 304 SS. The results show that the zeta potential, which is influenced by the pH of the solution, could be the major factor dictating the susceptibility of deposition at these conditions. EIS was used successfully to establish that magnetite deposition results in high values (> 106 ) of the magnitude of the impedance. Although qualitative, this could provide valuable information when monitoring boilers and power plants for deposition. These results also proved the success of the experimental setup developed in this project for simulating the boiler environments of interest and for studying the deposition phenomena commonly faced in boilers. This study is a one of a kind study focusing purely on the particle attachment aspect of deposition across a wide range of boiler water treatment chemistries with the results supported by surface analyses, impedance spectroscopy and theoretical calculations.

Download or read book List of Publications written by Atomic Energy of Canada Limited and published by . This book was released on 1992 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASM Handbook written by ASM International. Handbook Committee and published by . This book was released on 1990 with total page 1178 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes cover the properties, processing, and applications of metals and nonmetallic engineering materials. They are designed to provide the authoritative information and data necessary for the appropriate selection of materials to meet critical design and performance criteria.