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Safety assessment methodology focused on response characteristics of the disposal system and safety assessment for TRU waste in Japan

Published online by Cambridge University Press:  28 March 2012

T. Ohi ,
H. Ueda ,
H. Hyodo ,
T. Chiba ,
T. Takase  and
H. Takamura
T. Ohi
Affiliation:
Nuclear Waste Management Organization of Japan (NUMO), 1-23, Shiba 4-chome, Minato-ku, Tokyo, 108-0014 Japan
H. Ueda
Affiliation:
Nuclear Waste Management Organization of Japan (NUMO), 1-23, Shiba 4-chome, Minato-ku, Tokyo, 108-0014 Japan
H. Hyodo
Affiliation:
Nuclear Waste Management Organization of Japan (NUMO), 1-23, Shiba 4-chome, Minato-ku, Tokyo, 108-0014 Japan
T. Chiba
Affiliation:
JGC Corporation, 2-3-1 Minatomirai, Nishi-ku, Yokohama-shi, Kanagawa, 220-6001 Japan
T. Takase
Affiliation:
Mitsubishi Materials Corporation, 1-297 Kitabukuro-cho, Omiya-ku, Saitama-shi, Saitama, 330-8508 Japan
H. Takamura
Affiliation:
Kajima Corporation, 6-5-30 Akasaka, Minato-ku, Tokyo, 107-8502 Japan
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Abstract

In order to enhance the safety of geological disposal and the reliability of the safety assessment carried out for each stage of the geological disposal project, an assessment methodology focused on a sensitivity analysis and an evaluation of importance, which incorporates “system understanding” and “information feedback” into the existing assessment approach, has been developed in this study. In this paper, the assessment methodology and the assessment results as applied for the transuranic (TRU) waste disposal system in Japan will be described. In the sensitivity analysis, an approximate analytical solution was used in order to understand the response characteristics of the engineered barrier system (EBS). In the importance evaluation, important factors relating to the robustness of system safety were identified based on the response characteristics. Furthermore, important features, events, and processes (FEPs) related to such factors and high-impact scenarios were identified based on the information accumulated through “system understanding” and “information feedback”. Based on this approach, the robustness of the TRU waste disposal system was assessed and measures for improving the robustness were identified.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-o53
Copyright
Copyright © Materials Research Society 2012

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References

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