BIOSPHERE MODELING FOR SAFETY ASSESSMENT OF A HIGH-LEVEL RADIOACTIVE WASTE GEOLOGICAL DISPOSAL.

2000 ◽  
pp. 312
Author(s):  
&NA;
Keyword(s):  
Radioactive Waste ◽  
Safety Assessment ◽  
Geological Disposal ◽  
High Level Radioactive Waste ◽  
High Level

Safety Assessment of Geological Disposal of High-Level Radioactive Waste in Boom Clay: Relation With the Radionuclide Inventory

2009 ◽  
Author(s):  
Pierre Van Iseghem ◽  
Jan Marivoet
Keyword(s):  
Radioactive Waste ◽  
Safety Assessment ◽  
High Level Waste ◽  
Spent Fuel ◽  
Geological Disposal ◽  
High Level Radioactive Waste ◽  
Boom Clay ◽  
High Level ◽  
Clay Formation ◽  
Parameter Values

This paper discusses the impact of the parameter values used for the transport of radionuclides from high-level radioactive waste to the far-field on the long-term safety of a proposed geological disposal in the Boom Clay formation in Belgium. The methodology of the Safety Assessment is explained, and the results of the Safety Assessment for vitrified high-level waste and spent fuel are presented. The radionuclides having the strongest impact on the dose-to-man for both HLW glass and spent fuel are 79Se, 129I, 126Sn, 36Cl, and 99Tc. Some of them are volatile during the vitrification process, other radionuclides are activation products, and for many of them there is no accurate information on their inventory in the waste form. The hypotheses in the selection of the main parameter values are further discussed, together with the status of the R&D on one of the main dose contributing radionuclides (79Se).

Evaluated and Estimated Solubility of Some Elements for Performance Assessment of Geological Disposal of High-Level Radioactive Waste Using Updated Version of Thermodynamic Database

2010 ◽  
Author(s):  
Akira Kitamura ◽  
Reisuke Doi ◽  
Yasushi Yoshida
Keyword(s):  
Radioactive Waste ◽  
Performance Assessment ◽  
Safety Assessment ◽  
Thermodynamic Database ◽  
Energy Agency ◽  
Geological Disposal ◽  
High Level Radioactive Waste ◽  
Five Elements ◽  
High Level ◽  
Aqueous Species

Japan Atomic Energy Agency (JAEA) established the thermodynamic database (JAEA-TDB) for performance assessment of geological disposal of high-level radioactive waste (HLW) and TRU waste. Twenty-five elements which were important for the performance assessment of geological disposal were selected for the database. JAEA-TDB enhanced reliability of evaluation and estimation of their solubility through selecting the latest and the most reliable thermodynamic data at present. We evaluated and estimated solubility of the 25 elements in the simulated porewaters established in the “Second Progress Report for Safety Assessment of Geological Disposal of HLW in Japan” using the JAEA-TDB and compared with those using the previous thermodynamic database (JNC-TDB). It was found that most of the evaluated and estimated solubility values were not changed drastically, but the solubility and speciation of dominant aqueous species for some elements using the JAEA-TDB were different from those using the JNC-TDB. We discussed about how to provide reliable solubility values for the performance assessment.

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