Effects of long-term exposure of tuffs to high-level nuclear waste-repository conditions. Preliminary report Page: 4 of 27
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KEY TO TEST CONDITIONS
Test / Temperature Confining Pressure Pore Pressure Duration
(MPa) (MPa) (Months)
1 80"C 19.7 5.0 6
2 80 C 9.7 0.5 6
3 120"C 19.7 19.7 5-1/2
4 120"C 9.7 0.5 5-1/2
5 120*C 19.7 19.7 2-1/2
6 120 C 9.7 9.7 2-1/2
7 180"C 9.7 9.7 3-1/2
8 180"C 9.7 9.7 3-1/2
9 120*C 19.7 19.7 2
10 120C 9.7 9.7 2
Basic mechanical comparisons (compressive strength, tensile strength,
density, and porosity) were performed for all tests. MineralogiL and petro-
logic examinations will also be done for all tests. Permeability data will be
collected for tests 3 and 6 and thermal properties for tests 1, 4, and 5.
of welding and zeolite content. In addition, the Bullfrog and Tram units
selected are under consideration as target horizons for field investigations.
The samples exposed to high-temperature, high-pressure conditions were
2. 54-cm-diam by 6.5-cm-long cylinders. Control samples came from the same
piece of core as the test sample, in most cases cut side by side. Procedures
for handling, preparing, and storing the samples are in Appendix A. A com-
plete list of core samples tested is in Table I.
III. EXPOSURE CONDITIONS
Test conditions were chosen to simulate different burial depths, water
table levels, and distances from the waste canisters. The three temperatures
(80, 120, and 180*C) reflect current targets for average formation tempera-
tures. Confining pressures of 9.7 and 19.7 MPa simulate burial at 1500 and
3000 ft respectively, and differential pore-water pressures of 0.5 and 9.7 MPa
correspond to above- and below-water-table conditions.
Exposure times ranged from 2 to 6 months. A table of these variables,
along with the tests conducted and samples tested under each set of condi-
tions, is given in Appendix B. A schematic of the pressure and temperature
systems and a drawing of the pressure vessels are also in that appendix.
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Blacic, J.; Carter, J.; Halleck, P.; Johnson, P.; Shankland, T.; Andersen, R. et al. Effects of long-term exposure of tuffs to high-level nuclear waste-repository conditions. Preliminary report, report, February 1, 1982; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc696551/m1/4/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.