A legal instrument which, consistent with 31 U.S.C. 6304, is used to enter into a relationship:

(a) The principal purpose of which is to transfer a thing of value to the recipient to carry out a public purpose of support or stimulation authorized by a law of the United States, rather than to acquire property or services for the Department of Energy's direct benefit or use.

(b) In which substantial involvement is not expected between the DOE and the recipient when carrying out the activity contemplated by the grant.