Neptunium distribution in a high acid first cycle Purex Process

B. de Araujo; H. Matsuda; J. Araujo

doi:10.1007/bf02162664

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 187: Issue 2

Neptunium distribution in a high acid first cycle Purex Process

Authors:

B. de Araujo

B. de Araujo Comissão Nacional de Energia Nuclear-SP Instituto de Pesquisas Energeticas e Nucleares Travessa R, 400-Cidade Universitaria 05508-900 São Paulo Brasil

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H. Matsuda

H. Matsuda Comissão Nacional de Energia Nuclear-SP Instituto de Pesquisas Energeticas e Nucleares Travessa R, 400-Cidade Universitaria 05508-900 São Paulo Brasil

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, and

J. Araujo

J. Araujo Comissão Nacional de Energia Nuclear-SP Instituto de Pesquisas Energeticas e Nucleares Travessa R, 400-Cidade Universitaria 05508-900 São Paulo Brasil

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Pages:: 159–168

Online Publication Date:: 27 Sep 2005

Publication Date:: 17 May 1994

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02162664

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Abstract

This work deals with the extraction behavior of neptunium in a high acid Purex Process. The composition of PWR fuel type with 3.2% enrichment, 500 MWd/t burn-up and 100 d cooling time was considered. Two consecutive cold runs were performed in a mock-up facility at IPEN-CNEN/SP with simulated feed solutions containing: 3M HNO₃; 1M U; 455 g²³⁷Np labeled with²³⁹Np; 15 mg Zr l^–1, 12 mg Ce l^–1, 7 mg Ru l^–1 and 13 mg Mo l^–1 traced with active isotopes⁹⁵Zr,¹⁴¹Ce,¹⁰³Ru and⁹⁹Mo as FP. A 30 vol% TBP/n-dodecane was used as solvent. Countercurrent experiments were carried out using two 16 stages plexiglass mixer-settlers, at 25°C, during 21 h continuous operation, with O/A ratio of 2 in the extraction section and 9 and 13 in the 1st and 2nd scrubbing sections, respectively. For a 65% organic loading, ca. 77% of neptunium remains in the waste stream, without any Np valence adjustment.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)