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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:38 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Application of the IAEA safety assessment methodology during the decision making and licensing process for the romanian radioactive waste final repository
Authors:
Ortenzia Niculae, Lidia-Gabriela Vladescu, Mihaela Naum
Affiliation:
SITON-Subsidiary of Technology and Engineering for Nuclear Projects, Bucharest
E-mail
niculaeo@router.citon.ro
Keywords:
radioactive waste, safety assessment, radiation dose, safety indicators
Abstract:
The paper presents an overview on the IAEA recommended methodology to assess the safety of the radioactive waste final repositories (ISAM methodology), together to the Romanian specific contribution to detail and develop the assessment methods used during the safety assessment and decision making process for the Romanian Radioactive Waste Final Repository (RWFR), which will be located nearest to Cernavoda NPP.
The ISAM Methodology is a methodology traceable and transparent, which contains the following main steps: specification of the assessment context, description of the disposal system (near field, geosphere and biosphere), development and justification of the evolution scenarios, formulation and implementation of models and data, performing calculation and interpretation of results. There are, also, an especial back-up step, for control and certification of the obtained results.
The evolution scenarios are mainly based on the followings:
- migration and transport of radionuclides from waste (sorption, diffusion, dispersion and advection);
- transport equation for unsaturated and saturated geological layers;
- biosphere pathways (uptake of radionuclides in the crops, feed of animals);
- exposure pathways for human: contaminated water ingestion, consumption of crops and animal products (milk, meat).
The work performed during the development of normal and alternative evolution scenarios of RWFR, application of Interaction matrix method, as well as the calculation of doses received by public and other safety indicators using AMBER computer code is described. The most important obtained results, namely variation of the received dose for public (due to ingestion of contaminated water, vegetables, milk and beef meat) and the sensitivity analysis related to the size of final cover, depth and geometry of waste location, initial concentration of main radionuclides and total amount of dislocated material), are presented too.
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