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[en] Final Comments: As users, we have reached the age of maturity within social media, they are a very important part of our daily routine and are constantly growing. Social media should be properly chosen, since we are not going to offer a better service just for the fact that we have presence in every network. In fact, this may be counter- productive. Language used within social media is closer to the user: it entails a real interaction between users and institutions. Moreover, direct collaboration of users is needed and institutions should show gratitude for such interaction, and also assume when mistakes have been committed.
[en] On May 2005 the President of CNEA created the UBERA-6 project, belonging to the former Technology and Environmental Management, with the aim to convert to Low Enriched Uranium (LEU) the RA-6 reactor core, to swap with the US Department of Energy (US-DoE) equivalent inventories of High Enriched Uranium (HEU) for LEU, to export to USA the spent HEU core and to recover and downblend to LEU remnant HEU inventories contained in fuel and irradiation target scraps. By means of two contracts signed by CNEA and US-DoE, acquisition of consumables and graphite reflectors, the fabrication of LEU core replacement, conditioning, transport and exportation of spent HEU core and subsequent supply of fresh LEU for fuel and irradiation targets used in our research reactors were costed. During July, 2006 468 HEU based fresh plates were exported to USA. On June 30th, 2007 the RA-6 reactor temporarily stopped working and its personnel remover the HEU core to the auxiliary pool. On November 7th the former spent HEU based core was exported to USA. During May and July, 2008 the new RA-6 reactor LEU based core and control assemblies were provided. During March, 2009 the RA-6 reactor became critical. For recovering and blending down of remnant HEU inventories, the Triple Height Laboratory (LTA) was refurbished. A Supplemental Agreement to one of the original contract between CNEA and US-DoE will financially support the refurbishment of the Radiochemical Facility Laboratory (LFR) and so reprocess irradiated HEU retained in radioisotope production filters to downblend into LEU, as well as the separation of the pair Sr90-Y90 and of Cs137 inventories for further application in Nuclear Medicine.
[es]En Mayo de 2005 fue creado por el Presidente de CNEA el Proyecto UBERA-6, dependiente de la entonces Gerencia de Tecnologia y Medio Ambiente, con el proposito de convertir el nucleo del reactor RA-6 a uranio de bajo enriquecimiento (UBE), intercambiar con el Departamento de Energia de EUA (US-DoE) inventarios equivalentes de uranio de alto enriquecimiento (UAE) por UBE, exportar el nucleo de UAE gastado y recuperar y diluir isotopicamente a UBE los remanentes de fabricacion de blancos y combustibles. Mediante dos contratos firmados por CNEA y US-DoE se financio el costo de adquisicion de insumos y los reflectores de grafito y la fabricacion del nuevo nucleo de reemplazo, la campana de acondicionamiento, transporte y exportacion del nucleo gastado y la subsiguiente provision de UBE fresco para los combustibles y blancos de irradiacion de nuestros reactores de investigacion. Se exportaron 468 placas combustibles no irradiadas de UAE durante Julio de 2006. El 30 de Junio de 2007 el reactor RA-6 interrumpio temporalmente su funcionamiento y su personal removio el nucleo de UAE a la pileta auxiliar.El 7 de Noviembre de 2007 se exporto a EUA el viejo nucleo gastado. Durante Mayo y Julio de 2008 se proveyo al reactor RA-6 de su nuevo nucleo y ensambles de control basados en siliciuro de UBE. Durante Marzo de 2009 se puso a critico el reactor RA-6 con su nuevo nucleo. Se acondiciono el Laboratorio de Triple Altura (LTA) para la recuperacion y dilucion isotopica a UBE de los inventarios remanentes de UAE. Un acuerdo reciente de CNEA con el US-DoE extendera el contrato de provision de UBE para financiar el acondicionamiento del Laboratorio Facilidad Radioquimica y asi reprocesar el UAE irradiado retenido en filtros de produccion de radioisotopos y su conversion a UBE, junto con la separacion del par Sr90-Y90 y de Cs137 para su aplicacion ulterior en Medicina Nuclear.
[en] The development of silicon photovoltaic sensors at CNEA has begun in 1998.These sensors, fabricated in the Photovoltaic Laboratory of the Solar Energy Group at Constituyentes Atomic Center, have been used to build low cost radiometers as well as solar angular position sensors on board of artificial satellites.The design, fabrication and calibration of these sensors have been made in different prototypes in order to analyze its performance and to evaluate its limitations.Nowadays, several commercial prototypes have been distributed in different laboratories of our country in order to evaluate them in real work conditions.Particularly, the first experiment of argentine solar cells on space performed on board of SAC-A satellite, included the fabrication of position sensors of this satellite as part of the alignment system of the solar array respect to the sun.In this article, the state of the art of monocrystalline silicon photovoltaic sensors fabricated at CNEA for terrestrial and space applications is presented
[en] During the Annual meeting of the Asociacion Fisica Argentina, hold between September 20 and 22, 1963, Dr. Wolfgang Meckbach made a communication officially introducing to the argentine scientific community the Kevatron accelerator, build in the Bariloche Atomic Center: a ions accelerator of the Cockcroft-Walton type. The history of its construction and installation is related. (author)
[en] The dependence of radiation hardening with neutron doses or flow in zirconium with hydrides is measured. This study was conducted in annealed material, with an average grain size of 450m and with a concentration of 13% in volume of metastable phase hydrides. Traction test tubes were irradiated in CNEA's RA1 reactor for periods of 1 hour to 50 hours, corresponding to flows of 3.6 x 1015 cm-2 and 1.8 x 1017 n cm-2. These flows were selected to avoid the phenomena of saturation and instability from the damage that occurs above 5 x 1017 n cm-2. The hardening measurements showed a lineal dependence with the square root of the flow. Annealed isochrones were carried out and hardening was not recovered above stage V temperatures, which shows a possible interaction of the defects induced by the radiation with the hydrides in the material (Cw)
[en] The Argentine development in the nuclear field is analyzed from an anthropological and sociological standpoint. The author has made his 'field work' at the Reactor and Power Plants sector of the National Atomic Energy Commission. She examines the perception that the scientists and other workers of the nuclear field have of the role of its discipline and consequently of its own role in the society. The analysis is carried out into the framework of the situation of nuclear energy in the world and in Argentina in particular
[en] The paper investigates the origins of the Center and of the Institute of Physics 'Jose Antonio Balseiro' from the reconstruction of the experimental research programs that were developed between the years 1955 and 1962 in those organizations of the Argentine Atomic Energy Commission (CNEA). Within that intention the paper analyzes the scientific policy of the Institute of Physics and its relations with the CNEA as well as the strategy of resolution of the economic and institutional crisis that affected them between 1958 and 1959. Its incidence in the consolidation of the research programs is also examined