Improvement of nuclide leaching resistance of paraffin waste form with low density polyethylene.
Low-level liquid borate wastes have been immobilized with paraffin wax using a concentrate waste drying system (CWDS) in Korean nuclear power plants. The possibility for improving chemical durability of paraffin waste form was suggested in this study. A small amount of low density polyethylene (LDPE) was added to increase the leaching resistance of the existing paraffin waste form. The influence of LDPE on the leaching behavior of waste form was investigated by performing leaching test according to ANSI/ANS-16.1 procedure during 325 days. It was observed that the leaching of nuclides immobilized within paraffin waste form made a marked reduction although little content of LDPE was added to waste form. The acceptance criteria of paraffin waste form associated with leachability index (LI) and compressive strength after the leaching test were fully satisfied with the help of LDPE.
Leaching behavior of boric acid and cobalt from paraffin waste forms
Ninety-day leaching test was performed to investigate the leaching characteristics of paraffin waste forms that had been recently generated in large quantities at Korean nuclear power plants(KNPPs). In the case where mixing weight ratio of boric acid to paraffin was 78/22, which was adopted in concentrate waste drying system(CWDS) of KNPPs, the cumulative fraction leached(CFL) of boric acid and cobalt was about 51% and 61%, respectively. The compressive strengths of waste form before and after the leaching test exhibited 666psi(4.53MPa) and 232psi(1.58MPa), respectively. The CFLs of paraffin waste form were well expressed by diffusion-controlled dissolution model such as Gintsling-Brounshtein kinetics. The internal cross-sectional view of specimen after the test demonstrated the applicability of this unreacted shrinking core model to the leaching analysis of paraffin waste form.
Inquiring "Tree of Life" at Home: Persian Classic Literature in English Classes.
The recent decades of English Language Teaching (ELT) appear to be particularly concerned with the marginalisation caused by English linguistic, cultural, and academic colonisation and imperialism. Bold footprints of this academic monopoly can be seen in the wide incorporation of abridged or unabridged British and American literary works in foreign language settings. Such literary products are often legitimised as authentic materials authored by native speakers. Inspired by the idea of incorporating non-native literature and translated first language literature into English classes, the authors of this article sought to explore the possibilities of opening spaces for English translations of Persian classic works of literature in English as foreign language classrooms and tracing the language events that unfolded as a result of incorporating such literature. The participants of this two-semester long action research project were non-English major Iranian female university students, majoring in various fields at Alzahra University, Tehran, Iran. The sense of familiarity the students had with such national literary works led to the emergence of language instances lightened by sparks of virtue, vision, life and art.