• Title/Summary/Keyword: pyroprocessing

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Study on Governing Equations for Modeling Electrolytic Reduction Cell (전해환원 셀 모델링을 위한 지배 방정식 연구)

  • Kim, Ki-Sub;Park, Byung Heung
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.12 no.3
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    • pp.245-251
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    • 2014

  • Pyroprocess for treating spent nuclear fuels has been developed based on electrochemical principles. Process simulation is one of the important methods for process development and experimental data analysis and it is also a necessary approach for pyroprocessing. To date, process simulation of pyroprocessing has been focused on electrorefining and there have been not so many investigations on electrolytic reduction. Electrolytic reduction, unlike electrorefining, includes specific features of gas evolution and porous electrode and, thus, different equations should be considered for developing a model for the process. This study summarized required concepts and equations for electrolytic reduction model development from thermodynamic, mass transport, and reaction kinetics theories which are necessitated for analyzing an electrochemical cell. An electrolytic reduction cell was divided and equations for each section were listed and, then, boundary conditions for connecting the sections were indicated. It is expected that those equations would be used as a basis to develop a simulation model for the future and applied to determine parameters associated with experimental data.

  • https://doi.org/10.7733/jnfcwt.2014.12.3.245 인용 PDF KSCI KPUBS HTML

TiN Anode for Electrolytic Reduction of UO2 in Pyroprocessing (TiN 양극을 이용한 파이로프로세싱 UO2 전해환원)

  • Kim, Sung-Wook;Choi, Eun-Young;Park, Wooshin;Im, Hun Suk;Hur, Jin-Mok
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.13 no.3
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    • pp.229-233
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    • 2015

  • Developing novel anode materials to replace the Pt anode currently used in electrolytic reduction is an important issue on pyroprocessing. In this study, the electrochemical behavior of TiN was investigated as the conductive ceramic anode which evolves O2 gas during the reaction. The feasibility and stability of the TiN anode was examined during the electrolytic reduction of UO2. The TiN anode could electrochemically convert UO2 to metallic U in a LiCl–Li2O molten salt electrolyte. No oxidation of TiN was observed during the reaction; however, the formation of voids in the bulk section appeared to limit the lifetime of the TiN anode.

  • https://doi.org/10.7733/jnfcwt.2015.13.3.229 인용 KSCI KPUBS HTML

A Conceptual Design Study for a Spent Fuel Pyroprocessing Facility of a Demonstration Scale (사용후핵연료 파이로 처리공정 실증시설의 개념설계 연구)

  • Yoo, Jae-Hyung;Hong, Kwon-Pyo;Lee, Han-Soo
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.6 no.3
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    • pp.233-244
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    • 2008

  • A conceptual design study for a pyroprocesing facility, has been carried out in this study, which is available for the recovery of uranium and transuranic elemental group(TRU), that is, reusable as a nuclear fuel especially in a next generation-type reactor. The scale of this facility has been chosen as 20 kg HM/batch, comparatively small engineering size in order to collect scale-up data for the design of a commercial facility as well as to get operational experience. The spent fuel to be handled in this process is as follows : 3.5 % enriched uranium fuel, 35,000MWd/tU and 5-year cooled. The major items considered in the conceptual study are a building lay-out including various hot cells, safety management of the process operation in conjunction with material balance control, radiation safety, inert atmosphere control in shielded hot cells, and criticality control of uranium and TRU products.

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