105 research outputs found
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The First Step in the Final Shutdown of UP1 Plant: Rinsing with Chemical Reagents
The COGEMA UP1 reprocessing plant commissioned at Marcoule, France in 1958 handled roughly 20,000 metric tons of fuel from gas-cooled and research reactors. The commercial reprocessing activities of the UP1 plant ended in December 1997. CODEM , a joint venture created by the former users of the UP1 plant, including the utility Electricite de France (EDF), the French Atomic Energy Commission (CEA) and COGEMA, was established to fund and supervise decommissioning of the plant. COGEMA was selected as the industrial operator of the decommissioning project, which is scheduled to span a period of about 40 years. COGEMA, with its CODEM partners, had made the decision to proceed to a ''Final Shutdown'' of the plant within a few years after the end of commercial operation. Final shutdown is intended to remove remaining fissile matter and highly radioactive materials, as well as some equipment, from the plant to ease the plant monitoring requirements compared with those applied when the plant was in operation. A two-step approach has been devised, including first the rinsing of the equipment with selected reagents in order to decrease the radiation exposure rate and contamination risk enough to allow further mechanical decontamination operations, such as high-pressure water scrubbing and equipment cutting. The reagents to be used and the methods employed to optimize their use in terms of quantities and sequence of use were selected by leveraging available experience, and by setting up a large-scale R&D program to test reagents both for general decontamination and for hot spots. This program also included treatment of the decontamination waste to demonstrate that this waste could be made compatible with solidification facilities of the UP1 plant, i. e., vitrification in the AVM facility and bituminization. The R&D results are described, as well as the initial results of plant decontamination
Hematologia do Mylossoma duriventre (Serrasalmidae) da Bacia do Rio Solimões, Amazônia Central (Brasil).
Este estudo investigou os parâmetros hematológicos de Mylossoma duriventre Cuvier, 1817 da bacia do Rio Solimões, estado do Amazonas, Amazônia central, no Brasil. Variações intraespecíficas foram observadas para os parâmetros investigados, mas o hematócrito foi o parâmetro com menor variação. O número de eritrócitos mostrou correlação altamente positiva com o hematócrito. Nas extensões sanguíneas M. duriventre foram quantificados e caracterizados linfócitos, monócitos, neutrófilos, eosinófilos e leucócitos granular PASpositivo, mas houve predominância de linfócitos e neutrófilos. Tais leucócitos apresentaram características similares a de outras espécies de serrasalmídeos. Porém, foram observadas variações interespecíficas em alguns parâmetros investigados quando comparados a outros Serrasalmidae e Characidae da literatura. Este foi o primeiro estudo sobre parâmetros hematológicos de M. duriventre e os resultados obtidos poderão servir de comparação para outros estudos com esse peixe em outros ambientes
Musculoskeletal Disorders of the Upper Extremities Due to Extensive Usage of Hand Held Devices
The effects of an acid ph upon the induction of antiviral resistance in vitro by interferon.
Leucocyte-migration-inhibition test in patients with colorectal cancer: clinicopathological correlations
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