Evaluation of copper, aluminum bronze, and copper-nickel for YMP [Yucca Mountain Project] container material Page: 3 of 34
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REPOSITORY RE UIREMENTS AND CONDITIONS AT YUCCA MOUNTAIN
(a) Containment period: 300- 1000 years
(b) Temperature: Nominal: 250*C to 97 *C
(Some packages 250 *C to <97 C)
(c) Water composition and infiltration rate: 5 liters/year per container
- 10 ppm Cl, NO3, 02
-20 ppm S04
- 120 ppm HCO3
(d) Gamma flux: 104 to <102 rad/h
(e) Lithostatic and hydrostatic pressure: Nominally none
The temperatures are higher than in other repositories. The centerline temperatures within the
containers are as high as 325 *C, yielding a surface temperature around 250 *C at the beginning of
the containment period. The temperate will fall with time but should remain above the boiling
point (97 *C) for many containers during the whole of the required containment period. However,
for some packages-containing older fuel or high-level defense wastes--the temperature could fall
to below 97 *C during this period.
Since the packages will be placed in a desert environment above the water table, they will be
exposed to very little water. The 5 liters/year per container given in Table 1 is expected to be a
conservative overestimate. So far, we have not drilled any exploratory shafts at Yucca Mountain,
so we are not certain what the water chemistry will be in the region above the water table.
However, a large number of water samples have been taken from wells extending below the water
table in the close vicinity of the mountain, including the J-13 well. From these samples, the water
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Kass, J.N. Evaluation of copper, aluminum bronze, and copper-nickel for YMP [Yucca Mountain Project] container material, article, May 1, 1989; California. (digital.library.unt.edu/ark:/67531/metadc625023/m1/3/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.