HISSAE MIYAMOTO
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Artigo IPEN-doc 22293 Assessment of cement durability in repository environment2014 - FERREIRA, E.G.A.; VICENTE, R.; ISIKI, V.L.K.; MIYAMOTO, H.; GOBBO, L.A.; MARUMO, J.T.Publicação IPEN-doc 04474 Ten years of routine waste management at IPEN1992 - SUAREZ, A.A.; MIYAMOTO, H.Publicação IPEN-doc 03469 Gerenciamento de rejeitos radioativos provenientes do uso de materiais radioativos na medicina, industria e pesquisa1990 - SUAREZ, A.A.; MIYAMOTO, H.Artigo IPEN-doc 10872 Elaboracao de um formulario eletronico para cadastro de fontes seladas2003 - MARUMO, J.T.; ISIKI, V.L.K.; MIYAMOTO, H.Artigo IPEN-doc 15100 Characterization of cement paste as engineered barries of borehole repository2009 - FERREIRA, EDUARDO G.A.; ISIKI, VERA L.K.; MIYAMOTO, HISSAE; MARUMO, JULIO T.; VICENTE, ROBERTOResults of axial rupture by compression of cylindrical cement paste samples are presented. This is part of a research on cement paste behavior aiming at investigating the durability of cementitious materials in the environment of repositories for radioactive waste. Portland cement paste is intended to be used as a backfill in a deep borehole for disposal of sealed radiation sources which concept is under development. The service life of the engineered barrier materials plays an important role in the long term safety of such facilities. Accelerated tests in laboratory are being used to evaluate the performance of cement paste under the temperature expected at some hundred meters below grade, under exposure to the radiation emitted by the sources, and under the attack of aggressive chemicals dissolved in the groundwater, during the millennia necessary for the decay of the most active and long-lived radionuclides present in the waste. The large variability in results of mechanical strength as measured by axial compression of cylindrical samples is the subject of this short communication.Artigo IPEN-doc 15099 Durability of cement paste as engineered barrier in borehole waste repository2009 - ISIKI, VERA L.K.; FERREIRA, EDUARDO G.A.; MIYAMOTO, HISSAE; MARUMO, JULIO T.; VICENTE, ROBERTOThe Radioactive Waste Management Laboratory of the Nuclear and Energy Research Institute, in São Paulo, Brazil, is developing the concept of a repository for disposal of sealed radioactive sources. The concept is a deep borehole drilled a few hundred meters below surface in a granite batholith. Portland cement paste is the material intended to backfill the annular space between the steel casing and the geological formation around the borehole. The hardened cement paste is intended to function as barrier against water flow between the different strata of the geological setting crossed by the borehole and also as an additional barrier against inflow of water and migration of the radionuclides present in the sealed sources. A service life of thousands of years is a necessary characteristic of the engineered barriers in this repository because many sealed sources are long-lived. The durability of cementitious materials is known only for short periods and must be evaluated for long periods. This research aims at evaluating the durability of Portland cement paste under the repository conditions foreseen in that disposal facility, by accelerated tests in laboratory. In this paper we present results of mechanical strength, mass, and volume variations of cement samples under irradiation, high temperature and immersion in saline solutions, as a function of time.Artigo IPEN-doc 15097 Mineralogy and chemistry of cement paste in borehole radioactive waste repository2009 - FERREIRA, EDUARDO G.A.; ISIKI, VERA L.K.; MIYAMOTO, HISSAE; MARUMO, JULIO T.; VICENTE, ROBERTOArtigo IPEN-doc 05523 Imobolizacao de rejeitos umidos provenientes da purificacao de uranio1994 - DELLAMANO, J.C.; VICENTE, R.; ENDO, L.S.; MIYAMOTO, H.; MARUMO, J.T.Artigo IPEN-doc 05521 Rejeitos de baixa atividade: experiencia de gerenciamento rotineiro no IPEN1994 - MIYAMOTO, H.; VICENTE, R.; ENDO, L.S.Artigo IPEN-doc 17105 Behaviour of cement paste as backfill in waste disposal boreholes2011 - FERREIRA, EDUARDO G.A.; ISIKI, VERA L.K.; MIYAMOTO, HISSAE; MARUMO, JULIO T.; VICENTE, ROBERTO