While Monte Carlo, is merely plugging in randomly ranged values to stress test something I think that caution should be exercised with anything.

"And finally, there is Yucca Mountain the computer model. This Yucca Mountain is the most difficult to see, let alone understand. It is the virtual product of a program called a Monte Carlo simulation that calculates how much risk the real mountain’s specific flaws—water percolating through the rock, groundwater flowing beneath, potential earthquakes and volcanic eruptions—will pose over the thousands of years that the waste will remain dangerously radioactive. In its ethereal way, this ghost of Yucca Mountain embodies both the technocratic hubris and the gambler’s faith in the odds that have brought us to the brink of a decision whose consequences, as acknowledged by everyone involved, we cannot foresee."

http://www.motherjones.com/politics/2001/09/yucca-mountain-nuclear-roulette/