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Nuclear power plants

Xem 1-20 trên 88 kết quả Nuclear power plants
  • In the design criterion for the nuclear power plant piping system, the limit state of the piping against an earthquake is assumed to be plastic collapse. The failure of a common piping system, however, means the leakage caused by the cracks. Therefore, for the seismic fragility analysis of a nuclear power plant, a method capable of quantitatively expressing the failure of an actual piping system is required.

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  • An improved principal component analysis (PCA) method is applied for sensor fault detection and isolation (FDI) in a nuclear power plant (NPP) in this paper. Data pre-processing and false alarm reducing methods are combined with general PCA method to improve the model performance in practice. In data pre-processing, singular points and random fluctuations in the original data are eliminated with various techniques respectively. In fault detecting, a statistics-based method is proposed to reduce the false alarms of T2 and Q statistics.

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  • The failure of steam generators (SGs) due to corrosion is one of the most important problems in power plants. Impurities usually accumulate in the hot sides of SG and form deposits on the SG surfaces. In this paper, the sensitivity analysis of the accumulation of water impurities in the heat exchangers of nuclear power plants is presented.

    pdf8p minhxaminhyeu3 12-06-2019 3 0   Download

  • A high energy arcing fault event occurred in the medium-voltage (13.8 kV and 4.16 kV) metalclad switchgears in a nuclear power plant not only affecting switchgear but also connected equipment due to the arc energy. The high energy arcing fault also causes a fire that influences the safety function of the unit. Therefore, from the safety point of view, it is necessary to evaluate the influences of high energy arcing fault events on the safety functions of nuclear power plants.

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  • To assess the availability of a nuclear power plant’s dynamic systems, it is necessary to consider the impact of dynamic interactions, such as components, software, and operating processes. However, there is currently no simple, easy-to-use tool for assessing the availability of these dynamic systems.

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  • This article presents a security module based on a field programmable gate array (FPGA) to mitigate man-in-the-middle cyber attacks. Nowadays, the FPGA is considered to be the state of the art in nuclear power plants I&C systems due to its flexibility, reconfigurability, and maintainability of the FPGA technology; it also provides acceptable solutions for embedded computing applications that require cybersecurity.

    pdf8p minhxaminhyeu3 25-06-2019 5 0   Download

  • This study investigated the annual exposure limits of various countries, which can be used as an indicator in evaluating workers' internal exposure to radioactive aerosol during pipe cutting in the process of decommissioning nuclear power plants, and the growth and dynamics of aerosol. Also, to evaluate it, the authors compared/analyzed the cases of aerosol generated when activated pipes are cut in the process of nuclear power plants and the codes for evaluating internal exposure.

    pdf11p minhxaminhyeu3 25-06-2019 8 0   Download

  • This article presents a new design of earthquake instrumentation that is suitable for quick decisionmaking after the seismic event at the nuclear power plant (NPP). The main objective of this work is to ensure more availability of the NPP by expediting walk-down period when the seismic wave is incident. In general, the decision-making to restart the NPP after the seismic event requires more than 1 month if an earthquake exceeds operating basis earthquake level.

    pdf9p minhxaminhyeu3 25-06-2019 5 0   Download

  • Three-dimensional (work-site) reconstruction models of dismantling fields are useful for workers to observe the conditions of dismantling field situations without visiting the actual fields. This study, based on AR and work-site reconstruction models, developed and evaluated an information reference system. The evaluation consists of questionnaires and interview surveys administered to six nuclear power plant workers who used this system, along with a scenario.

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  • The importance of performing Level 3 probabilistic safety assessments (PSA) along with a general interest in assessing multi-unit risk has been sharply increasing after the Fukushima Daiichi nuclear power plant (NPP) accident. However, relatively few studies on multi-unit Level 3 PSA have been performed to date, reflecting limited scenarios of multi-unit accidents with higher priority.

    pdf9p minhxaminhyeu3 25-06-2019 6 0   Download

  • Residual stress is a critical element in determining the integrity of parts and the lifetime of welded structures. It is necessary to estimate the residual stress of a welding zone because residual stress is a major reason for the generation of primary water stress corrosion cracking in nuclear power plants. That is, it is necessary to estimate the distribution of the residual stress in welding of dissimilar metals under manifold welding conditions. In this study, a cascaded support vector regression (CSVR) model was presented to estimate the residual stress of a welding zone.

    pdf8p minhxaminhyeu4 26-06-2019 10 1   Download

  • In this paper, new tethered aerial robots including roaming tethered aerial robots (RTARs) for radioactive material sampling and stationary tethered aerial robots (STARs) for environment monitoring are proposed to meet extremely-long-endurance missions of nuclear power plants. The flight of the proposed tethered aerial robots may last for a few days or even a few months as long as the tethered cable provides continuous power.

    pdf15p minhxaminhyeu5 30-06-2019 1 0   Download

  • Pipe wall thinning in the secondary piping system of a nuclear power plant is currently a major problem that typically affects the safety and reliability of the nuclear power plant directly. Regular in-service inspections are carried out to manage the piping system only during the overhaul. Online thickness monitoring is necessary to avoid abrupt breakage due to wall thinning.

    pdf8p minhxaminhyeu5 30-06-2019 6 0   Download

  • This paper introduces the development of a transient monitoring system to detect the early stage of a transient, to identify the type of the transient scenario, and to inform an operator with the remaining time to turbine trip when there is no operator's relevant control. This study focused on the transients originating from a secondary system in nuclear power plants (NPPs), because the secondary system was recognized to be a more dominant factor to make unplanned turbine-generator trips which can ultimately result in reactor trips.

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  • Nuclear power approximately supplies a sixth of the world's electricity and considers as the major source of "carbon-free" energy today. With growing concerns aboutglobal warming, it is not surprising that governments and power providers around the world are considering building a substantial number of additional nuclear power plants. These plants have demonstrated remarkable reliability and efficiency with the help of extensive research work and sharing operational practical experience.

    pdf246p namde01 11-04-2013 70 20   Download

  • This book covers various topics, from thermal-hydraulic analysis to the safety analysis of nuclear power plant. It does not focus only on current power plant issues. Instead, it aims to address the challenging ideas that can be implemented in and used for the development of future nuclear power plants. This book will take the readers into the world of innovative research and development of future plants. Find your interests inside this book!Steam Generator

    pdf0p orchid_1 25-09-2012 82 18   Download

  • (bq) part 2 book "power plant engineering" has contents: diesel power plant, gas turbine power plant, nuclear power plant, hydro electric power plants, electrical system, pollution and its control.

    pdf237p bautroibinhyen20 06-03-2017 26 5   Download

  • (bq) part 2 book "power plant engineering" has contents: steam turbines, condenser, feed water and circulating water systems, nuclear power plants, hydroelectric power plant, diesel engine and gas turbines power plants, energy storage, non conventional power generation, environmental degradation and use of renewable energy.

    pdf549p bautroibinhyen18 23-02-2017 24 4   Download

  • (bq) part 2 book "power plant engineering" has contents: steam turbines, condenser, feed water and circulating water systems, nuclear power plants, hydroelectric power plant, diesel engine and gas turbines power plants, energy storage, non conventional power generation, environmental degradation and use of renewable energy.

    pdf549p bautroibinhyen20 06-03-2017 20 2   Download

  • The serious challenge facing the world today, in obtaining enough energy for growing population and in controlling the carbon emission caused by fossil fuel use, calls for nuclear energy as an alternative power source. This book presents research work and technical experience from several power plants and research institutions around the world from practical prospective.

    pdf0p cucdai_1 19-10-2012 52 9   Download

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