Migration behavior of plutonium in compacted bentonite under reducing condition by using electromigration

Kazuya Idemitsu, Xiaobin Xia, Yoshiro Kikuchi, Yaohiro Inagaki, Tatsumi Arima, T. Mitsugashira, M. Kara, Y. Suzuki

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 PuOH 2+ or PuCl2+ by the thermodynamic calculation.

Original languageEnglish
Pages (from-to)591-596
Number of pages6
JournalUnknown Journal
Volume807
Publication statusPublished - 2004

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Plutonium
Bentonite
Electromigration
plutonium
bentonite
Iron
repository
iron
Radioisotopes
Carbon steel
radionuclide
corrosion
Anodes
steel
Corrosion
carbon
containment
Waste disposal
waste disposal
Buffers

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

Cite this

Migration behavior of plutonium in compacted bentonite under reducing condition by using electromigration. / Idemitsu, Kazuya; Xia, Xiaobin; Kikuchi, Yoshiro; Inagaki, Yaohiro; Arima, Tatsumi; Mitsugashira, T.; Kara, M.; Suzuki, Y.

In: Unknown Journal, Vol. 807, 2004, p. 591-596.

Research output: Contribution to journalArticle

Idemitsu, Kazuya ; Xia, Xiaobin ; Kikuchi, Yoshiro ; Inagaki, Yaohiro ; Arima, Tatsumi ; Mitsugashira, T. ; Kara, M. ; Suzuki, Y. / Migration behavior of plutonium in compacted bentonite under reducing condition by using electromigration. In: Unknown Journal. 2004 ; Vol. 807. pp. 591-596.
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AU - Idemitsu, Kazuya

AU - Xia, Xiaobin

AU - Kikuchi, Yoshiro

AU - Inagaki, Yaohiro

AU - Arima, Tatsumi

AU - Mitsugashira, T.

AU - Kara, M.

AU - Suzuki, Y.

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AB - 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 PuOH 2+ or PuCl2+ by the thermodynamic calculation.

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