CPA punk, I will agree that this was a confusing area - I read this chapter back to back twice before moving on. I think I understand this concept pretty well, someone correct me if I am wrong.
The IRR equates the present value of inflows with the initial investment. Thus when you use the IRR method, the NPV is already 0 (BEC 3-16 indicates you can accept projects with a NPV >= 0, including "equal to"). Using the IRR method, if the IRR is greater than the hurdle rate (BEC-20), you would accept the project even though the NPV is 0 because it is implicit in this budgeting technique.
Bobkorz's response is incorrect because using the IRR method itself implies it is acceptable to take projects with a 0 NPV, as long as the IRR calculated exceeds the hurdle rate.
Short Version:
Accept projects with a NPV greater or equal to 0 (however see the profitability index discussion on BEC -22 - NPV of 0 would be the lowest rank with an index of 1)
Accept IRR projects, which has a NPV of 0, with an IRR greater than (not equal to) the hurdle rate.
REG 80 2/7/11
FAR 91 10/8/11
AUD 97 11/22/11
BEC 96 2/4/12