scholarly journals Study on Evaluation Method of Potential Geological Environmental Changes of ^|^lsquo;Uplift and Erosion^|^rsquo; for Performance Assessment on a High Level Radioactive Waste Geological Disposal System

2010 ◽  
Vol 51 (5) ◽  
pp. 229-240 ◽  
Author(s):  
Makoto KAWAMURA ◽  
Takeshi EBASHI ◽  
Hitoshi MAKINO ◽  
Tadafumi NIIZATO ◽  
Ken-ichi YASUE ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Performance Assessment ◽  
Evaluation Method ◽  
Environmental Changes ◽  
Geological Disposal ◽  
High Level Radioactive Waste ◽  
High Level ◽  
Uplift And Erosion

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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