Nuclear Energy for New Europe 2009

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No: 903

Conference: Nuclear Energy for New Europe 2009

Title: Comparison of Two Numerical Modeling Codes for Hydraulic and Transport Calculations in the Near Field

Theme: Radioactive Waste Management

Author(s): Jan Kalin, Borut Petkovšek, Philippe Montarnal, Alain Genty, Estelle Deville, Jure Krivic

Contact : Jan Kalin

E-mail: jan.kalin@zag.si

Address: Zavod za gradbeništvo Slovenije
1000 Ljubljana

Country: Slovenia

In the past years the Slovenian PA/SA team has performed many generic PA/SA studies for the future Slovenian LILW repository, most recently a Special Safety Analysis (SSA) for the Krško site. The modelling approach taken was to split the problem into three parts: near-field (detailed model of the repository), far-field (i.e., geosphere) and biosphere. In the SSA the code used to perform near-field calculations was Hydrus2D.
Recently the team has begun a cooperation with CEA/Saclay and, as a part of this cooperation, begin investigations into using the Alliances numerical platform for near-field calculations in order to compare the overall approach and calculated results
The article presents the comparison between these two codes for a silo-type repository that was considered in the SSA. We will present the physical layout and characteristics of the repository and develop and implement a hydraulic and transport model of the repository in Alliances. Some analysis of sensitivity to mesh fineness and to simulation timestep have been preformed and will also be presented. The compared quantity will be the output flux of radionuclides on the boundary of the model. We will compare the results and comment on differences/similarities.

No:	903
Conference:	Nuclear Energy for New Europe 2009
Title:	Comparison of Two Numerical Modeling Codes for Hydraulic and Transport Calculations in the Near Field
Theme:	Radioactive Waste Management
Author(s):	Jan Kalin, Borut Petkovšek, Philippe Montarnal, Alain Genty, Estelle Deville, Jure Krivic
Contact :	Jan Kalin
E-mail:	jan.kalin@zag.si
Address:	Zavod za gradbeništvo Slovenije 1000 Ljubljana
Country:	Slovenia

In the past years the Slovenian PA/SA team has performed many generic PA/SA studies for the future Slovenian LILW repository, most recently a Special Safety Analysis (SSA) for the Krško site. The modelling approach taken was to split the problem into three parts: near-field (detailed model of the repository), far-field (i.e., geosphere) and biosphere. In the SSA the code used to perform near-field calculations was Hydrus2D. Recently the team has begun a cooperation with CEA/Saclay and, as a part of this cooperation, begin investigations into using the Alliances numerical platform for near-field calculations in order to compare the overall approach and calculated results The article presents the comparison between these two codes for a silo-type repository that was considered in the SSA. We will present the physical layout and characteristics of the repository and develop and implement a hydraulic and transport model of the repository in Alliances. Some analysis of sensitivity to mesh fineness and to simulation timestep have been preformed and will also be presented. The compared quantity will be the output flux of radionuclides on the boundary of the model. We will compare the results and comment on differences/similarities.