Well, there isn't a credible design basis fault that would give you a quake larger than that. That's the issue. As I said before, the issue is what a credible design basis fault is. What is the largest quake we've seen in the region? What are the driving things? This was my point earlier about the environmental assessment.
I can tell you right now that if we have a level 9 quake, everything is going to fall down. It's all about the probability of having such a thing. You have to bound everything in life with reasonable assumptions.