The ACR-1000 today is designed around the use of slightly enriched uranium. So it is a higher uranium content than the natural uranium we use for the CANDU 6. We say it is “slightly enriched” because it is less enriched than the low-enriched fuel that's used in the light water reactors, which is in the range of 4% to 5%. The ACR is, I believe, just over 2%, versus 0.9% in the natural uranium.
On June 5th, 2008. See this statement in context.