...Abstract Localized corrosion of solubilized and thermally aged alloys UNS N06690 and N06600, used in nuclear power plant steam generator tubing, was studied in simulated wet lay-up conditions. The results showed that, despite having half of the chromium content of alloy N06690, alloy N06600...

...Abstract UNS N06690 is one of the current choices for nuclear power plant steam generator tubing. The alloy intensity to some submodes of stress corrosion cracking is a function of sensitization. Sensitization results from chromium carbide precipitation at grain boundaries when the alloy...

.... The process chemistry and methodology utilized for cleaning is applied in a very short outage window and is flexible enough to work around other SG outage tasks. Connection to the steam generator blowdown piping in an auxiliary building, if the plant configuration allows, eliminates the amount...

... cautions regarding specific local regulations are also presented. steam generator chemical cleaning air emissions INTRODUCTION During power operation, the steam generators (SG) of nuclear power plants accumulate large quantities of deposits, primarily metal oxides. Additionally, some plants accumulate...

... third of a pound of deposits per day accumulating in the steam generators. Startup activities have been shown to contribute over 100 pounds to the steam generator deposit inventory. There are a number of factors that attribute to the accumulation of deposits, some of which can be mitigated...

... accelerated corrosion (FAC) and the electrochemical behaviour of reactor and steam generator (SG) materials. Tests can be done under conditions simulating a nuclear power plant heat transport system (HTS) and SG operation. High-temperature water is pumped through nozzles, impinging on the surface of test...

...Abstract Since the start of commercial nuclear power operation, the industry has reported a variety of steam generator corrosion damage. Operating practices introduced in the 1980s and 1990s to improve the secondary side chemistry and to reduce the introduction of oxidants (e.g. EPRI water...

... in the impurities concentration mechanism achieved into the crevice but it also makes some assumptions for the easy solving of mathematical equations. Because into the steam generator the measurement of the impurities concentration and/or deposition in the crevices solutions is not achievable, one cannot estimate...

... of accelerating corrosion processes compared to those expected to occur in the steam generator. While assuming the crevice to be initially pre-packed with magnetite may not be consistent with some potential field applications, it was felt to be the best means of providing a relatively uniform crevice geometry...

... DESCRIPTION Under contract to the Electric Power Research Institute (EPRI) and sponsoring utilities, ⁽¹⁾ Foster-Miller, Inc., together with R. Brooks Associates, Inc. (Brooks), developed an enhanced system for Steam Generator Upper Bundle Hydraulic Cleaning (UBHC). The basis for the advanced...

... resistance of alloy 600MA. mill annealed alloy 600 steam generator primary water stress corrosion cracking zinc addition oxide film spinel structure INTRODUCTION PWR Primary Water Stress Corrosion Cracking (PWSCC) has been experienced on the primary side of mill annealed alloy 600 (600MA) steam...

...The designs vary primarily in size. The Combustion Engineering (CE), hereinafter referred to as Company A, designed steam generator can contain two to three times the heat surface of the Westinghouse, hereinafter referred to as Company B, designed steam generator. ( Figure 1 ) Abstract From...

.... Several tests were run, during which these transitions occurred within a range of 400 seconds. Abstract A device has been constructed which mimics the geometry and operating conditions of a tube/tube support plate crevice in a pressurized water reactor (PWR) steam generator. This apparatus...

...Abstract Secondary side stress corrosion cracking (SCC) of steam generator (SG) tubes may be due to the formation of an acid environment in crevices, as demonstrated for several Belgian plants. The susceptibility of alloys 600 and 800 in this type of environment, which had been partially evidenced...

...The results of oxidation state/speciation analysis are shown in Table 2 . Abstract The steam generator tubes at the Indian Point 2 Nuclear Station have not exhibited severe secondary side degradation in spite of the accumulation of latge amounts of hard sludge. Several different factors involving...

...It is well known that changes in fuel-oil properties may produce an undesirable effect on the high temperature behaviour of steam-generator components. Heavy fuel oils rich in asphaltenes (18%), vanadium (300 ppm), sulphur (4.42%) and sodium (150 ppm), will very likely fill an increasing proportion...

... * Present Address: GE Nuclear Energy, Vallecitos Nuclear Center, P. O. Box 460, Pleasanton, CA 94566 Abstract Hydrothermal decomposition rate constants and high temperature pH values of some selected high-molecular weight amines and amino acids were measured under simulated steam generator...

... intersections were also visually examined. ABSTRACT Nuclear steam generator chemical cleaning has been under development for two decades and is rapidly gaining acceptance by the nuclear industry as a long-term remedy for steam generator thermal/hydraulic performance degradation. The Three Mile Island Unit 1...

...INTRODUCTION In fossil fuel-fired power stations, chemical cleaning is routinely employed to combat corrosion of steam generator tubes. It can be used: - either preventively, to keep the surface clean and avoid boiling troubles which causes local superheating. It is also used to prevent...

... boundaries hydrogen intergranular steam generator INTRODUCTION The Scanning Electron Microscope (SEM) is a powerful tool for use in conducting failure analysis of boiler tubing. The combination of microstructural observation and microchemical analysis by energy-dispersive x-ray spectrometry (EDX) reveals...