I presume you mean Duderstadt and Hamilton, Nuclear Reactor Analysis.
I doubt that the answers to problems are found on any website that is in the public domain, and I doubt professors would publish answers, except for perhaps select problems.
Dear
i live in Iraq, do u know what that means?
because of the wars there are no big book stores specially in this field(Nuclear), and when i want to buy any book from the net there is no (Iraq) in the list.