Authors:
A. Kumar Central Ground Water Board North Western Regional Laboratory SCO-3, Sector-26 Chandigarh 160019 India

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J. Sonawane Bhabha Atomic Research Centre Nuclear Recycle Group Tarapur P.O. Ghivali Thane, (M.S.) 401502 India

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N. Rathore Bhabha Atomic Research Centre Nuclear Recycle Group Tarapur P.O. Ghivali Thane, (M.S.) 401502 India

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H. Kapur Bhabha Atomic Research Centre Nuclear Recycle Group Tarapur P.O. Ghivali Thane, (M.S.) 401502 India

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A. Venugopalan Bhabha Atomic Research Centre Nuclear Recycle Group Tarapur P.O. Ghivali Thane, (M.S.) 401502 India

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D. Bajpai Bhabha Atomic Research Centre Nuclear Recycle Group Tarapur P.O. Ghivali Thane, (M.S.) 401502 India

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Abstract  

Partitioning of minor alpha-emitting actinides, especially U, Pu and Am from medium active alkaline waste is possible from intermediate level liquid wastes (ILLW) produced during spent fuel reprocessing following Purex process. This paper deals with the efficient removal of alpha-activity from ILLW by solvent extraction process. Counter current batch extraction with O/A ratio 2:1 as well as multistage mixer settler has demonstrated that most of the alpha-activity was removed from the alkaline effluents using 20% Versatic-10 (V-10) in dodecane after giving 3 to 4 contacts, thus converting alkaline waste as non-alpha waste. Under the optimum conditions (pH 9.0-9.5 and VA-10), both Pu(IV) and Am(III) are highly extractable whereas U(VI) is relatively poorly extracted. To assess the applicability of this process for regular treatment of the waste, a feasibility study on pilot plant scale using six stage mixer settler was operated to treat the ILLW. The results indicated that almost >99.90% alpha-emitting actinides are removed. Dilute nitric acid (0.5M HNO3) served as the most efficient strippant for all these actinides. This facilitate an easy regeneration of the extractant which can be recycled. This method is useful in obtaining alpha-free wastes and had positive impact on ease and safety aspects during subsequent waste treatment and long term storage.

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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)