Results 1 - 10 of 159
Results 1 - 10 of 159. Search took: 0.018 seconds
|Sort by: date | relevance|
[en] This presentation will describe the U.S. Department of Energy’s Office of Environmental Management work to achieve the safe cleanup of the environmental legacy created after six decades of nuclear weapons production and federal government-sponsored nuclear science research and technology development. An overview of the technical cleanup challenges across the DOE complex will be presented, as well as major accomplishments to date and remaining clean-up challenges. (author)
[en] The development of a decommissioning project entails a large number of activities, even before the plant stops its commercial operation. These activities are administrative, technical and project management - related, and they cover a wide array of disciplines and specialties. Empresarios Agrupados, as a provider of engineering services involved in several decommissioning projects in Spain and Europe over the past 20 years, has determined that the following aspects are key to the successful outcome of a decommissioning project.
[en] The results from the study of modern geochemical conditions in the tailing Centralny Yar and determination of speciation of Uranium in terms of its mobility in tailing material using modified BCR sequential extraction protocol are presented.
[en] The paper describes the work done in order to improve the regulatory framework in the field of radioactive waste and decommissioning of nuclear and radiological facilities. The National Commission for Nuclear Activity Control, as the nuclear regulatory authority of Romania, has improved the regulatory framework developing the safety and licensing requirements in the field of predisposal and disposal of radioactive waste and decommissioning of nuclear and radiological facilities. The paper describes the content of predisposal management and decommissioning regulations.
[en] The main purpose of the paper is to present the development procedure of the eOMEGA as a platform for decommissioning costing of nuclear facilities. The eOMEGA costing platform, intended to be a part of the universal eOMEGA platform covering also the other activities within the back-end of nuclear power engineering, is considered to be a tool for assessment and transparent presentation of decommissioning costing data in the harmonised structure. The methodology for cost calculation in the eOMEGA is in line with the international recommendations and best practices and is based on the methodology defined in the International Structure for Decommissioning Costing (ISDC) of Nuclear Installations.
[en] Nuclear power plants usually have a typical design life of 40 years which can be extended up to 60 years. At the end of their operating life-times, they need to be decommissioned to ensure the safety. The design and operational management of early nuclear power plants were given inadequate consideration for the decommissioning resulted in difficulty in dismantling reactor, large amounts of waste, and high costs when implementing decommissioning. Decommissioning has become an important issue that has hindered the development of nuclear power. Safety analysis report is a major technical document reviewed by regulatory authority, and therefore should include the relevant content on facilitating decommissioning. China National Nuclear Safety Administration has asked the operator to prepare an independent chapter (Chapter 20) for describing design features and operational measures to facilitate decommissioning in safety analysis report for nuclear power plants in 2013. This paper introduces the format and content of the newly developed Chapter 20 of the safety analysis reports for academic exchanges.
[en] After having operated numerous nuclear facilities since the 1950s, the CEA (French Atomic and Alternative Energies Commission) must now manage the dismantling of those which have reached the end of their lifetime. These high priority actions have led to the creation of an R&D dismantling division which aims at providing innovative tools, including intervention scenario simulation. Simulation is a good means of visualizing highly radioactive environments where humans cannot enter, of testing different technical alternatives, and of training workers prior to interventions. For a few years, the CEA has developed a generic simulation platform based on virtual reality (VR) technologies, usable on any decommissioning project. On this platform, different kinds of simulation can be run: physics, kinematics, virtual human simulation and dose-rate calculation. All these modules are embedded in a software called iDROP, taking into account the whole aspects involved in nuclear operations in a single simulation. This paper describes the different application cases where VR simulation has been used to design dismantling operations, presents the lessons learnt from these different implementations.
[en] At the advanced state of remediation of complex legacies left behind by uranium mining and processing operations, the need arises to provide and document evidence of remedial success. In the case of large amounts of radioactive materials remaining near the surface evidence can only be provided in the framework of a prolonged monitoring process. Objective documentation of the remedial success as part of the knowledge management is a precondition for the release of rehabilitated objects from regulatory control. Such documentation also provides the basis for implementing long-term tasks on rehabilitated objects including institutional control. This paper illustrates by case examples the way in which evidence of the remedial success is provided and the required data and information on remediation are made available to the various users.
[en] Decommissioning projects are characterized by several risks, long schedule and cost estimates that lie in the range of hundreds of billions of dollars. In many countries, decommissioning projects are even more significant than the nuclear new build. Despite this extremely high relevance there is a huge gap in the literature concerning the benchmarking of these projects. The ultimate goal of the research is to understand communalities between successful projects and unsuccessful ones to draft guideline for the project management. The research methodology presented here is based on a structured process to review the cases and to spot “cross-case” patterns. These “patterns” will then be generalized to generate theoretical propositions.
[en] Strategy for decommissioning of Units 1-4 of Kozloduy NPP: - The strategy for decommissioning of Units 1-4 is ''brown field''; - Continuous dismantling of equipment; - Decommissioning process completion by 2030. - Key phases (principal activities): 01 Pre-deommissioning activieties; 02 Facility shutdown activities; 03 Procurement of equipment; 04 Dismantling activities; 05 Treatment of RAM and RAW and delivery for disposal; 06 Site management and support; 07 Project management and engineering; 08 Management of SNF and activated materials.