Development of a new process for the radioactive ion exchange resins conditioning - HYPEX ®

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2025-02-01 DOI:10.1016/j.pnucene.2025.105639

Francesca Crivelli , Silvio Cao , Marino Corrado , Claudio Mascialino , Laura Savoldi , Giancarlo Ventura

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引用次数: 0

Abstract

A novel process, HYPEX®, for the conditioning of radioactive ion-exchange resins (IEXs), has been developed and is presented here. The process involves the immobilization of radioactive IEXs into a geopolymer matrix after grounding down to a micrometer scale and a complete hydration. The studied geopolymers are based on metakaolin and activated by an alkali solution. The effects of ∼

90

different combinations of the structural atomic ratios in the geopolymer, such as silicon/aluminum (Si/Al) and water/aluminum (H₂O/Al), on macroscopic mechanical properties were examined, aiming at identifying the most suitable geopolymer for the conditioning of spent resins. Two geopolymer formulations were selected, both utilizing a fully sodium-based alkali solution and enriched with calcium hydroxide and siliceous inert filler to enhance their mechanical properties. One formulation involves the use of sodium silicate, while the other incorporates silica fume. Fractions of 20%wt and 30%wt of treated resin were added to the selected geopolymer matrices, and several tests were carried out in accordance with the Italian Safety Criteria for the Management of Radioactive Waste as far as resistance to compression, water immersion, thermal cycles, radiation, leachability, fire, and gas permeability are concerned. It is demonstrated here that HYPEX® satisfies the stringent Italian Criteria, even when 30%wt of resin is embedded.

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.