TY - GEN
T1 - Derivation of an approximate analytical solution for understanding the response characteristics of the EBS
AU - Ohi, T.
AU - Chiba, T.
AU - Nakagawa, T.
AU - Takase, T.
AU - Nakazawa, T.
AU - Akagi, Y.
AU - Idemitsu, Kazuya
PY - 2012/12/1
Y1 - 2012/12/1
N2 - To perform a safety assessment for the geological disposal of radioactive waste, it is important to understand the response characteristics of the disposal system. In this study, approximate analytical solutions for steady-state nuclide releases from the engineered barrier system (EBS) of a repository were derived for an orthogonal one-dimensional diffusion model. In these approximate analytical solutions, inventory depletion, decay during migration and the influence of groundwater flow in the excavation damaged zone (EDZ) were considered. These solutions were simplified by the Taylor theorem in order to clearly represent the response characteristics of the EBS. The validity of these solutions was shown by comparison with numerical solutions. The response characteristics of the EBS are useful for identifying target values for important parameters that would have the effect of improving the robustness of system safety. The robustness of the geological disposal system and the reliability of the safety assessment can thus potentially be improved using the approximate analytical solutions.
AB - To perform a safety assessment for the geological disposal of radioactive waste, it is important to understand the response characteristics of the disposal system. In this study, approximate analytical solutions for steady-state nuclide releases from the engineered barrier system (EBS) of a repository were derived for an orthogonal one-dimensional diffusion model. In these approximate analytical solutions, inventory depletion, decay during migration and the influence of groundwater flow in the excavation damaged zone (EDZ) were considered. These solutions were simplified by the Taylor theorem in order to clearly represent the response characteristics of the EBS. The validity of these solutions was shown by comparison with numerical solutions. The response characteristics of the EBS are useful for identifying target values for important parameters that would have the effect of improving the robustness of system safety. The robustness of the geological disposal system and the reliability of the safety assessment can thus potentially be improved using the approximate analytical solutions.
UR - http://www.scopus.com/inward/record.url?scp=84872286769&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84872286769&partnerID=8YFLogxK
U2 - 10.1557/opl.2012.597
DO - 10.1557/opl.2012.597
M3 - Conference contribution
AN - SCOPUS:84872286769
SN - 9781605114521
T3 - Materials Research Society Symposium Proceedings
SP - 341
EP - 348
BT - Scientific Basis for Nuclear Waste Management XXXV
ER -