Sept 26 (Reuters) - NEW YORK, September 26 (Fitch) Fitch Ratings affirms the senior student loan notes at 'AAAsf' issued by Nelnet Student Loan Trust 2009-3. The Rating Outlook on the notes, which is tied to the sovereign rating of the U.S. government, remains Negative. Fitch used its 'Global Structured Finance Rating Criteria' and 'Rating U.S. Federal Family Education Loan Program Student Loan ABS' to review the ratings. The ratings on the senior notes are affirmed based on the sufficient level of credit enhancement to cover the applicable risk factor stresses. Credit enhancement for the senior notes consists of overcollateralization and projected minimum excess spread. Fitch has taken the following rating actions: Nelnet Student Loan Trust 2009-3: --Class A affirmed at 'AAAsf'; Outlook Negative.