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Report No.
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Development of Guideline for Evaluating and Categorizing the Reliability of Distribution Coefficient Values in the JNC-Sorption Database

Yoshihiko, Saito,; Ochs, M.*; Jintoku, Takashi*; Suyama, Tadahiro*; Shibata, Masahiro ; Sasamoto, Hiroshi   ; Yui, Mikazu

Japan Nuclear Cycle Development Institute (JNC) has developed the JNC-Sorption Database (JNC-SDB) for bentonite and rocks in order to assess the retardation property of important radioactive elements in natural and engineered barriers in the H12 report. The database includes distribution coefficient (Kd) of important radionuclides. The Kd values in the JNC-SDB are about 20,000 data. And the JNC-SDB includes a great variety of Kd and additional key information from many different experimental conditions. Accordingly, the following classification guideline and classification system were developed in order to evaluate the reliability of each Kd value. (1) Criterion I: Completeness of documentation and type of Kd information (2) Criterion II: Quality of reported data from a technical and scientific point of view (3) Criterion III: Consistency of data with the majority of related reliable studies (4) An overall classification system / The checkpoints in Criterion II evaluate the reliability of each Kd entry in the JNC-SDB ; solid phase, adjustment and control of pH, redox conditions, final solution composition, temperature, solid/water ratio and grain size, sorption value, initial radionuclide concentration, phase separation, reaction time, agitation method, radionuclide loading, reaction vessels, uncertainty estimates, parameter variation

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