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AbstractAbstract
[en] This publication consists of an historical overview of waste management research. It first deals with summary of the situation till the 70s, then with the actual one, and finally with some of the future uses of the conclusions of the Stripa Project. (TEC)
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Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 449-455; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] This publication deals with the evaluation of the Buffer Mass Test, that mainly concerned heating of the bentonite/rock that was used to simulate hot canisters in deposition holes, swelling and swelling pressures of the expanding bentonite in the holes, so as water uptake of the bentonite in the holes, as well as in the tunnel backfill. Concerning the temperatures of the bentonite and surrounding rock, the records found were below the maximum that had been set, but were upper than the expected values. (TEC). 13 figs., 1 tab., 3 refs
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Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 349-366; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] During the three phases of the Stripa Project the engineered barriers research group has investigated several aspects of significant importance in relation to sealing radioactive waste repositories in crystalline rocks. In Phase 1 the emplacement of bentonite-based buffer around the waste packages and the behaviour of buffer, backfill and host rock were investigated. In Phase 2 the plugging of boreholes, shafts and tunnels was demonstrated. In Phase 3 the studies addressed two main aspects: the grouting of fractured rock and the longevity of sealing materials. (authors). 5 figs
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Source
Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 415-435; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] The Fourth International Symposium of the OECD/NEA Project was held on 14-16 October 1992, in Stockholm. It marked the end of the Stripa Project, that began in 1977. The primary goals of this project were to develop techniques to scientifically characterize a granitic rock mass, in order to transform it into a radioactive waste disposal. The symposium was organised into five sessions: (1) Natural Barrier-characterization; (2) Natural Barrier-modelling; (3) Engineered-barriers; (4) Overview Reporting; (5) Panel Discussion. Separate abstracts were prepared for all the papers in this volume. (TEC)
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1994; 468 p; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992; ISBN 92-64-14225-8;
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AbstractAbstract
[en] This publication deals with the Borehole Plugging Experiment (BPE). The BPE comprised field tests of the sealing function the practicality, in handling and application, of plugs of perforated metal casings filled with cylindrical blocks of highly compacted sodium bentonite. The field tests demonstrated that even very long holes can effectively be sealed by such plugs and that the clay becomes very homogenous and forms a tight contact with the rock in a relatively short time. Flow tests showed that the plugs were efficient even at high pressures. The major sealing process seems to be the establishment of a very tight bentonite/rock interface. (TEC). 14 figs., 4 refs
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Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 367-396; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] The Stripa clay sealing program involved testing of the function of smectite clay in the form of commercial bentonite for plugging and grouting purposes. Plugs were prepared by compressing clay powder to blocks which hydrated, swelled and sealed off the space they were put into, while grouting was made by use of thixotropic clay gels, which were injected into fractures in low-viscous form and transformed to stiff clay with time. The longevity of smectite clay in repository environment was investigated throughout the project. The function of smectite clay seals of high density was concluded to be very good over very long periods of time, while clay grouts may be short-or long-lived depending on temperature and geochemistry. (author). 3 figs., 13 refs
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Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 305-315; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] A simple back-analysis of groundwater results related to excavation of the SCV (Site Characterization and Validation) drift in the Stripa Project has been conducted in order to assess the applicability of porous medium conceptual model to the SCV site. It has been found that a porous medium model can not explain all of the observed measurements. In particular, the predicted groundwater pressure draw down and recovery are not consistent with the behaviour observed. The authors have no simple explanation for this inconsistency. (authors). 4 figs., 2 tabs., 2 refs
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Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 437-446; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] In the Site Characterization and Validation (SCV) project a selected volume of the Stripa granite was characterized geohydrologically by methods developed in the Stripa project. This formed a basis for a conceptual geohydrological model, that was refined stepwise. In this context Discrete Fracture Flow Models were used to predict ground-water inflow and transport of solutes to an excavated drift in the SCV-block. Model calculations were compared to experimental results in the drift and through a formalized process, involving judgements from a peer group, the validity of the numerical models was evaluated. (author). 4 refs
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Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 195-201; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] During phase three of the Stripa project we have developed the discrete fracture network modelling approach for understanding flow and transport through fractured rocks. We describe the NAPSAC software package developed to incorporate this approach and how NAPSAC can be used in conjunction with conventional models as part of an integrated program of site investigation and assessment. The usefulness and feasibility of the approach has been demonstrated by applying it to make successful predictions of a series of field experiments. (authors). 8 refs., 3 tabs., 5 figs
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Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 219-235; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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AbstractAbstract
[en] During the Stripa Project was developed a new-pulse borehole radar system (RAMAC) which could be used in three different ways: single-hole reflection, cross-hole reflection, and cross-hole tomography measurements. Thanks to this radar, it was possible to determine the orientation of a fracture zone from measurements in a single borehole. (TEC). 6 figs., 7 refs
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Source
Nuclear Energy Agency, 75 - Paris (France); 468 p; ISBN 92-64-14225-8; ; 1994; p. 111-123; Organisation for Economic Co-Operation and Development; Paris (France); 4. International Symposium of the Stripa Project; Stockholm (Sweden); 14-16 Oct 1992
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