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Read Online or Download Engineered Barrier Systems in the Context of the Entire Safety Case, Workshop Proceedings, Oxford, United Kingdom, 2527 September 2002 PDF

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Extra info for Engineered Barrier Systems in the Context of the Entire Safety Case, Workshop Proceedings, Oxford, United Kingdom, 2527 September 2002

Sample text

Where applicable, these design requirements address general and EBS specific regulatory considerations, in an effort to provide technologically feasible and economically viable solutions. They take into account the interactions between the construction and operation of the EBS and the natural environment. They respond to the specific attributes of waste types. They evolve taking into consideration lessons learnt from prior safety assessments, peer review comments and regulatory authority requirements and recommendations.

57 Figure 5. Schematic overview of a segment of drift seal Figure 6. g. salt briquettes or crushed salt (Figure 5). Prior to the construction of the segments the EDZ along the drift wall will be removed. After the construction of the sealing body cement grout is injected into the contact zone between the sealing body and the surrounding rocks using sealing rings connected to the 58 pump (forward/backward run) by a hull for sealing ring tubes, which will be over-drilled after having completed the injection process (Figure 6).

High quality sealing of large cavities has to be avoided due to technical problems and a large excavation disturbed zone (EDZ). Additionally, the drift seals have to be placed in rock salt to avoid leaching processes. 4 shows the drift seal placed between potash seams B (southern field, disposal area) and C (central part, potential pathway) separating the southern field from the central part. The drift seal in the northern ventilation drift on the 2nd level is the most severe location, as the thickness of the intact rock salt layer between potash seams B and C is only about 25 m.

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