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Immobilization of Long-Lived Radionucleides

#1063


Synthesis and Investigation of the Optimal Crystalline Materials for Immobilization of Plutonium, Actinides and Iodine-129 by Various Methods

Tech Area / Field

  • ENV-WDS/Waste Disposal/Environment
  • ENV-RWT/Radioactive Waste Treatment/Environment

Status
8 Project completed

Registration date
08.08.1997

Completion date
21.05.2003

Senior Project Manager
Hamada S

Leading Institute
Khlopin Radium Institute, Russia, St Petersburg

Collaborators

  • Norwegian Radiation Protection Authority, Norway, Osteras\nBritish Nuclear Fuels Ltd (BNFL), UK, Chesire, Risley Warrington\nLawrence Livermore National Laboratory, USA, CA, Livermore\nForschungszentrum Karlsruhe Technik und Umwelt / Institut für Nukleare Entsorgungstechnik, Germany, Karlsruhe

Project summary

Project objectives

The main objective of the Project is a choice, scientific substantiation and development of optimal methods for the synthesis of the most stable materials suitable for final immobilization of the most dangerous long-lived radionuclides, including redundant weapon plutonium Pu-239, the actinide fraction of high-level radioactive wastes (Pu, Np, Am, Cm), and iodine-129.

Technical approach and expected results:

The presented Project is characterized by the perse technical and methodological approaches to solution of the set tasks:


- The synthesis of crystalline materials is carried out in a wide range of temperatures and pressures with application of a source blend, prepared by various methods;
- Research of source materials and synthesized samples is done as much as possible in detail by a complex of methods (microprobe, optical microscopy, X-ray diffraction analysis, chemical analyses) with the purpose of a correct substantiation of their physico-chemical stability for a long time and in conditions of the aggressive environment;
- The choice of the most optimal ceramic compositions is carried out with allowance for of an economic feasibility of methods for their synthesis and adaptability to existing technologies;
- The results of experiments on synthesis of matrices and research of their properties are used for simulation of the behavior of crystalline ceramics for a long-duration time and in conditions of natural or artificial environments.

Expected results are:


- Justified set of stable host-phases, the most optimal by geochemical, technological and economic criteria for final immobilization of weapon plutonium, actinides and iodine-129 by various methods;
- Optimal methods and conditions of synthesis the host-phases with allowance for of the requirements of nuclear and radiation safety;
- Models of processes of radiation damages in crystalline matrices and migration from them of radionuclides in the various geochemical environments;
- The long-term forecast of the geochemical behavior of crystalline host-phases, doped with actinides and iodine-129 in deep wells in granitoids of the Nizhnekanskiy massive (Krasnoyarsk Region, region of the radiochemical plant RT-2).

The role of the foreign collaborators

The operations within the framework of the given project are supposed to be conducted in cooperation with Japan Atomic Energy Research Institute and Lawrence Livermore National Laboratory (USA).


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