%0 Book
%A Chiriki, Suresh
%T Disposal strategy of proton irradiated mercury from high power spallation sources
%V 67
%I RWTH Aachen
%V Dr.
%C Jülich
%M PreJuSER-136200
%@ 978-3-89336-632-3
%B Schriften des Forschungszentrums Jülich. Reihe Energie und Umwelt / Energy und Environment
%P XIV, 124 S.
%D 2010
%Z Record converted from JUWEL: 18.07.2013
%Z RWTH Aachen, Diss., 2010
%X Large spallation sources are intended to be constructed in Europe (EURISOL: nuclear
%X physics research facility and ESS: European Spallation Source). These facilities would
%X accumulate more than 20 metric tons of irradiated mercury in the target, which has to be treated as highly radioactive and chemo-toxic waste. Liquid waste cannot be tolerated in European repositories. As part of this work on safety/decommissioning of high-power spallation sources, our investigations were focused mainly to study experimentally and theoretically the solidification of liquid mercury waste (selection of an adequate solid mercury
%X form and of an immobilization matrix, chemical engineering process studies on
%X solidification/stabilization and on encapsulating in a matrix). Based on experimental results and supported by literature Hg-chalcogens (HgS, HgSe) will be more stable in repositories than amalgams. Our irradiation experimental studies on mercury waste revealed that mercury sulfide is a reasonable solid for disposal and shows larger stability in possible accidents with water ingress in a repository. Additionally immobilization of mercury in a cement matrix and polysiloxane matrix were tested. HgS formation from liquid target mercury
%X by a wet process is identified as a suitable formation procedure. These investigations reveal that an almost 99.9% elementary Hg conversion can be achieved and that wet process can be reasonably handled under hot cell conditions.
%F PUB:(DE-HGF)3
%9 Book
%U https://juser.fz-juelich.de/record/136200