Here's the URL, report title and key quote concerning Yucca mountain:

From "Yucca Mountain Science and Engineering Report", DOE/RW-0539:
http://www.ymp.gov/documents/ser_a/index.htm

MTHM = metric tons of heavy metal

The materials that may be disposed at Yucca Mountain include about 63,000 MTHM
of commercial spent nuclear fuel; about 2,333 MTHM of DOE spent nuclear fuel;
and about 4,667 MTHM of DOE high-level radioactive waste. All the waste forms
transported to and received at a repository would be solid materials. No
liquid waste forms would be accepted for disposal.

63,000 + 2,333 + 4,667 = 70,000 MTHM

------------------ My comment -------------------------
Yucca Mountain is for disposal of high level nuclear waste (fuel rods) which can have a half-life of thousands of years. The vast bulk of nuclear waste is medium and low level waste which has a typical half life of 50 years. I would argue that low and medium level nuclear waste is no more dangerous than chemical industrial waste, i.e. methyl chloride, organic heavy metal (mercury, lead) compounds, etc. Chemical industrial waste can be dangerous for centuries.

IMHO, spent fuel rods as high level nuclear waste should have the transuranics processed out thus transforming the high level waste into medium level waste. The transuranics should be burned up in nuclear reactors as reprocessed fuel. The plutonium from old power plant rods has Pu-240(?) in it which significantly degrades it for weapon use (the rods are "over cooked"). The argument that fuel reprocessing would cause weapons proliferation is nonsense. Loose ex-Soviet nukes constitute the real threat of nuclear proliferation.

Gary