Upload & Sell: Off
There are a few stock photo calculators out there that will give you a good idea for pricing. One year seems pretty short, I'd think 3 years is more likely. Exclusivity adds a lot to the fee but there are different levels of exclusivity. Exclusive in the financial industry, exclusive use on a credit card, exclusive in a certain geographic area...
I would think that is something the CU would just go to a stock photo agency website instead of approaching a individual photographer but good luck.