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The current tendency to increase fuel burnup in nuclear power plants requires the investigation of the characteristics of residues from spent fuel. The microstructure of the residues after dissolution was analysed by optical microscopy and SEM/EDAX. Many large diameter metallic inclusions were observed in the residues. The estimated temperature at the fuel centre is about 2000 C. 80 % of the total residue consisted of the five elements, Mo, Ru, Rh, Pd and Tc, which form an alloy at high temperatures, and is the main reason for the increase in amount of residue, roughly twice as much from RISOE fuel as from commercial LWR fuel (extrapolated up to 70 MWd/kgU).

Additional information

Authors: TSUKADA T, CRIEPI, Komae Research Laboratory (JP);KAMEYAMA T, CRIEPI, Komae Research Laboratory (JP);YOKOYAMA H, CRIEPI, Komae Research Laboratory (JP);GLATZ J-P, JRC Karlsruhe (DE);KOCH L, JRC Karlsruhe (DE);GARCIA-ALONSO I, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: RECOD '94 : Fourth International Conference on Nuclear Fuel Reprocessing and Waste Management, London (GB), April 24-28, 1994
Availability: Available from (1) as Paper EN 38785 ORA
Record Number: 199510121 / Last updated on: 1995-08-22
Original language: en
Available languages: en
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