Vattenfall

About: Vattenfall is a company organization based out in Stockholm, Sweden. It is known for research contribution in the topics: Wind power & Combustion. The organization has 685 authors who have published 857 publications receiving 18912 citations. The organization is also known as: Vattenfall AB & Kungliga Vattenfallstyrelsen.

Legerohr zum Verteilen und Speichern von Flüssigkeit

Abstract: Legerohr zum Verteilen und Speichern einer einstromenden Flussigkeit mit einer beliebigen Temperatur in einem fur die Flussigkeit vorgesehenen Speichertank (3), in dem die gespeicherte Flussigkeit aufgrund sich unterscheidender Dichten auf verschiedenen Temperaturniveaus geschichtet wird, wobei das Legerohr (7), so ausgebildet ist, dass es sich vertikal durch die im Tank gespeicherte Flussigkeit erstreckt und ein Einstromende und eine Ausstromoffnung umfasst, die mit einer Ruckschlagventilvorrichtung versehen ist, die ein Ausstromen der Flussigkeit in den Tank erlaubt, aber ein Einstromen vom Tank in das Legerohr verhindert, dadurch gekennzeichnet, dass die Ausstromoffnung die Form einer langlichen Offnung oder Schlitzes (8) hat, die beziehungsweise der sich in longitudinaler Richtung des Legerohrs (7) und im wesentlichen langs der gesamten Langenausdehnung des besagten Legerohrs erstreckt und dass die Ruckschlagventilvorrichtung ein langliches flexibles Element (11) umfasst, das relativ zum Legerohr langs einer Linie oder eines Bereichs parallel zur longitudinalen Ausdehnung der Ausstromoffnung befestigt ist und welches durch sich...

Living HRA: Building New Communities of Practice for Proactive Safety Management:

Abstract: In order to improve human reliability assessment (HRA) methods, we need to understand the role of HRA in a safety assessment process as applied in the industry today. The traditional focus on HRA as provider of human error probability numbers for probabilistic risk assessment obscures the diversity of HRA users and uses that can be identified when HRA is analyzed in its organizational context. Once such an organizational perspective is adopted, opportunities for new communities of practice emerge, linking HRA with other human factors and safety-related activities (event review, training, design etc) into a continuous safety management / safety monitoring process. This paper presents results from an interview study at a nuclear power plant in Europe. It documents current practices, constraints and problems in the application of HRA. It also identifies opportunities for improved use of plant-specific operational information and makes suggestions on how other practitioners at the plant can capitalize on the results, knowledge and experience of HRA analysts. Implications for the development of second-generation HRA methods are discussed. Language: en

Strategic long term planning of asset investments in distribution networks using the ASP tool

Abstract: This paper describes the ASP tool (Asset Strategy Planning) and the importance of trustable and reliable data from various departments within the company. The ASP tool is using a platform from British telecommunications plc called BT Business Simulation Framework. This is a long-term planning and simulation tool for the evaluation of different asset strategies and their impact on business. Assets with different ages are structured according to asset types and geography then assigned with investment, maintenance-costs and error statistics. By altering the levels of investment for the simulations we get a better control over network conditions and cost picture. We get a possibility to simulate how various efforts in maintenance and / or investments affect the asset stock status, SAIDI and the cost picture for longer periods. ASP also provides more transparent communications in the organization when it comes to the consequences that the various budget options will give by both short and long term. It is possible to speak a shared language between technology department, maintenance department, facility owners, finance department etc. In the end, we get decision support with clear and common rules for prioritization of budgetary resources between different regions of the organization. Strategic decisions based on "gut feelings" are a thing of the past and changed to long-term and sustainable strategies. (4 pages)

Prediction of Gas-Holdup in Filtered Containment Venting System

Abstract: A filter system to be used in order to reduce the radioactive pollution when reducing the pressure in the containment in case of a severe accident is developed The radioactive pollution will be captured in the vessel that acts as a bubble column To be able to maximize the water content in order to ensure that the radioactive pollution is captured it is of importance to predict the swelled water level in the vessel In this study is three different methods to predict the gas holdup is presented and compared to experimental results; empirical correlations, thermal-hydraulic codes and Computational Fluid Dynamics (CFD) The advantages and disadvantages with the different methods are discussedBoth Computational Fluid Dynamics and the thermal hydraulic code (Gothic) show good predictions of the water level Using empirical models it is crucial to have knowledge of the two-phase flow region in the bubble columnCopyright © 2014 by ASME