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HLW Project
Nuclear energy
Repository concept
Hydrofrac in HLW repository
The other side

For the safe disposal of high-level nuclear waste (HLW), it is required to understand the mechanism of Thermal-Hydrological-Mechanical-Chemical (T-H-M-C) coupling in the area nearby the deposition holes with or without buffer material.

Due to the long term thermal inputs generated by decay heat from the spent fuel, the development and implementation of coupled mechanisms in HLW project may not be neglected since the failure mechanisms of the waste package are all interrelated in terms of T, H, M, and C.

The total systems approach based on N2 diagram (or Rock Engineering System, Hudson, 1992) may be considered to identify the coupled interactions to be incorporated in the modeling of near field environment of the emplaced HLW canister. The N2 diagram or interaction matrix has been frequently used in the field of systems engineering to help identify the interactions or interfaces between major factors from systems perspective.

The N x N interaction matrix consists of N leading diagonal components and N2-N off-diagonal components. The leading diagonal components, Aii, represent the parameter of the system to be investigated. The off-diagonal component, Aij, represents the interface (or impact) of the parameter Aii on Aij and sometimes called as the one-way interaction component. The interaction matrix is not usually symmetric since interaction Aij is not always same as Aji under the normal situation. Once the diagonal parameters, Aii, are set, then the N2 diagram forces us to consider each interaction component, Aij, to complete the matrix. Therefore, the interaction matrix can be used as a thinking tool to construct a system using parameters and interactions between those parameters.

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International Coupled Mechanism Collaboration

The FEBEX project has the dual objective of demonstrating the feasibility of actually manufacturing and assembling an engineered barrier system and of developing methodologies and models for assessment of the thermo-hydro-mechanical (T-H-M) and thermo-hydro-chemical (T-H-C) behavior within the engineered barrier system (near field).

Decovalex III Project

A continuation of the multidisciplinary interactive and cooperative research effort in modeling Thermo-Hydro-Mechanical (T-H-M) processes in fractured rocks and buffer materials

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