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Abstract

The aim of this research is to separate selectively the actinides and long-lived radioactive fission products from the bulk salt matrix of high level liquid waste (HLLW) coming from the MTR fuel reprocessing, which may contain up to 1.4 moles/litre of aluminium nitrate. In particular this research is focussed on the decontamination of the aqueous first cycle raffinate (1AW) produced by the ENEA experimental reprocessing plant named EUREX. Taking into account the chemical and radiochemical composition of this liquid waste, certain chemical processes, based on ion precipitation and ion exchange in both acidic and alkaline media, were investigated. The studies related to this project concern: - fission products and actinides selective precipitation by using organic and inorganic reagents such as sodium tetraphenylborate and phosphotungstic acid; - strontium and actinides co-precipitation by sorption on ferric hydroxide after the solution alkalinization; - ion exchange separation by using polyantimonic acid and zeolites. All the experiments were performed at laboratory scale, using traced simulated solutions and, in hot cell, real MTR waste. Results regarding the intercomparison tests are reported in Annex B.

Additional information

Authors: GROSSI G, ENEA, Centro Ricerche Energia Casaccia, Nuclear Fuel Cycle Department, Roma (IT);PIETRELLI L, ENEA, Centro Ricerche Energia Casaccia, Nuclear Fuel Cycle Department, Roma (IT);TROIANA F, ENEA, Centro Ricerche Energia Casaccia, Nuclear Fuel Cycle Department, Roma (IT)
Bibliographic Reference: EUR 13644 EN (1992) 45 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-3357-8
Record Number: 199210112 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en