Download Engineered Barrier Systems in the Context of the Entire by Nirex PDF

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

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The concrete is used in the sense of a mass concrete. Consequently, special attention has to be paid to hydration heat during the construction phase to avoid crack evolution. 7°C was measured experimentally. Figure 7. Failure and dilatancy bound of salt concrete M2 in comparison with rock salt Dilatancy bounds of the salt concrete M2 were determined by laboratory tests to serve as a criterion for assessing crack evolution due to mechanical and restraint stresses. Dilatancy bounds of salt concrete M2 are given in Figure 7 in comparison to the failure bound and dilatancy bound of rock salt.

For example, reducing uncertainty about the dissolution model and rate of vitrified waste may allow to relax design requirements on waste package (WP) lifetime. A sensitivity analysis identifying those parameters most important to performance may focus attention on associated design requirements. Requiring the implementation of an observation program during repository operation adds complexity, which may translate into additional modeling needs and design requirements. Using construction and operation procedures that minimize any negative impact on natural barrier performance may allow to relax those design requirements intended to compensate for such an impact.

An initial permeability k < 10-18 m2 leads to a release of radionuclide that is sufficiently low. In addition long-term stability has been proven as corrosion due to NaCl or MgCl2 saturated brines migrating through the seals proceeds sufficiently slowly during the required time period. As laboratory tests showed that the permeability of salt concrete M2 fulfils the requirement k < 10-18 m2 (Table 2, Figure 8) the required limited flow rate migrating through the sealing body and consequently sufficient long-term stability can be proved.

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