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Migration Behavior of Plutonium in Compacted Bentonite under Reducing Condition by Using Electromigration

Published online by Cambridge University Press:  01 February 2011

Kazuya Idemitsu ,
Xiaobin Xia ,
Yoshiro Kikuchi ,
Yaohiro Inagaki ,
Tatsumi Arima ,
T. Mitsugashira ,
M. Hara  and
Y. Suzuki
Kazuya Idemitsu
Affiliation:
Dept of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, JAPAN
Xiaobin Xia
Affiliation:
Dept of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, JAPAN
Yoshiro Kikuchi
Affiliation:
Dept of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, JAPAN
Yaohiro Inagaki
Affiliation:
Dept of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, JAPAN
Tatsumi Arima
Affiliation:
Dept of Applied Quantum Physics and Nuclear Engineering, Kyushu Univ., Fukuoka, JAPAN
T. Mitsugashira
Affiliation:
The Oarai Branch, Institute for Materials Research, Tohoku University, Ibaraki, JAPAN
M. Hara
Affiliation:
The Oarai Branch, Institute for Materials Research, Tohoku University, Ibaraki, JAPAN
Y. Suzuki
Affiliation:
The Oarai Branch, Institute for Materials Research, Tohoku University, Ibaraki, JAPAN
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Abstract

Carbon steel is one of the candidate overpack materials for high-level waste disposal and is expected to assure complete containment of vitrified waste glass during an initial period of 1000 years in Japan. Carbon steel overpack will be corroded by consuming oxygen introduced by repository construction after closure of repository and then will keep the reducing environment in the vicinity of repository. The reducing condition will be expected to retard the migration of redox-sensitive radionuclides by lowering their solubilities. Therefore, the presence of corrosion products of iron in buffer material is important to discuss the migration behavior of redox-sensitive radionuclides. Plutonium electromigration experiments in bentonite have been carried out with source of iron ions supplied by anode corrosion of iron coupon. Plutonium migrated from the iron anode toward cathode as deep as 1 mm of the interior of bentonite within 24 h. Thus plutonium chemical species would have positive charge and were estimated as PuOH2+ or PuCl2+ by the thermodynamic calculation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 591
Copyright
Copyright © Materials Research Society 2004

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References

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