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Fission Platinoid Recovery

#1052


Development of Technological Options for Fission Platinoid Recovery from Spent Nuclear Materials

Tech Area / Field

  • ENV-RWT/Radioactive Waste Treatment/Environment

Status
8 Project completed

Registration date
29.07.1997

Completion date
17.06.2003

Senior Project Manager
Hamada S

Leading Institute
All-Russian Scientific Research Institute of Non-Organic Materials named after A. Bochvar, Russia, Moscow

Supporting institutes

  • All-Russian Research and Designing Institute of Complex Energetic Technology, Russia, St Petersburg\nNPO Mayak, Russia, Chelyabinsk reg., Oziorsk\nInstitute of Inorganic Chemistry, Russia, Novosibirsk reg., Akademgorodok\nKhlopin Radium Institute, Russia, St Petersburg

Collaborators

  • Forschungszentrum Karlsruhe Technik und Umwelt / Institut für Nukleare Entsorgungstechnik, Germany, Karlsruhe

Project summary

Incapable of forming a homogeneous glass matrix, fission palladuim, rhodium and ruthenium abundant in HLLW make waste vitrification and long-term storage complicated. On the other hand, the fission platinoids can find many applications (alloying, power engineering, catalysis etc.), both along with and (partly) instead of natural platinoids.

The goal of the Project is to develop a promising technological options as a basis of integrated hydrometallurgical processes for recovering and extensive decontamination (by 8 - 10 orders of magnitude) fission platinoids (rhodium and palladium) from spent fuel reprocessing high level waste.

In the context of compatibility with the current aqueous reprocessing practice (PUREX) hydrorr.etallurgical processes like solvent extration, chemical and e'etrochemical precipitation, sorption are preferable. These processes combined with an original selective correction of valent states and continuous equipments of small size can provide an ecologically safe power beneficial recovery of fission platinoids.

Up-to-date investigation and control techniques wili be used to realize the Project. Technologic parameters will be checked using models (centrifugal extractors, etc.) of continuous operation.

The scope of activities involves:


- creation of database covering the fission platinoid chemistry, their behaviour as PUREX-technology omponents.their recover»' experience and probable applications in nuclear engineering and national economy;
- calculations of the accumulation and radiation characteristics of fission platinoids and relevant products;
- study of the thermodynamics and kinetics of some valency and coordination transformations of Pd and Rh with respect to principal operating condition of the PUREX-process and HLLW management;
- an extensive study of coordination chemistry for Rh in aqueous nitrate-nitrite systems;
- development of hydrometallurgic radiopiatinoid concentration and refining (polishing) operations;
- tests of process as developed using imitated mixture with radiotracers like Ru(Rh) - 106, Sb-125, Ag-110 m, Pd-103, Pu-239, Am-241 etc;
- optimization of instrumental chemical and radiochemical control techniques;
- engineering of an optimum integrated flowsheet for fission Pd and Rh recovery.

The findings obtained and experience of scientists from the USA, Japan, France and other EC countries will serve as a foundation for an interactive discussion of the most promising approaches to the NOBEL-cycle accessible to the world community.

The final expected outcome of the Project will be optional processes for an integrated hydrometallurgical production of fission Pd and Rh of high performance, compatible with the current reprocessing PUREX practice.

A long-year experience of participating scientists and engineers with radioactive materials, fission (since 1966) and natural platinoid management (especially rhodium) suggest a successful Project realization at a high scientific and engineering level.

The Project addresses the ISTC objectives. It can redirect the skill and experience of Russian weapon xperts (40 out of 50 participants) to peaceful activities. The finding of great ecologic consequence will be put at the disposal of the world community.

The Project will contribute to safe and economically favourable nuclear engineering progress due to more reliable HLW vitrification and further storage and because of running anew essentially abundant source of fission Pd and Rh.

Foreign collaborators could participate in discussing the interim and final results, preparing joint publications and mutually benefitial realization of technological options developed to bring fission platinoid production to a new level to expand the scope of their applications.


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