41 USC 602 - Applicability of law

(a) Executive agency contracts 
Unless otherwise specifically provided herein, this chapter applies to any express or implied contract (including those of the nonappropriated fund activities described in sections 1346 and 1491 of title 28) entered into by an executive agency for
(1) the procurement of property, other than real property in being;
(2) the procurement of services;
(3) the procurement of construction, alteration, repair or maintenance of real property; or,

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(4) the disposal of personal property.
(b) Tennessee Valley Authority contracts 
With respect to contracts of the Tennessee Valley Authority, the provisions of this chapter shall apply only to those contracts which contain a disputes clause requiring that a contract dispute be resolved through an agency administrative process. Notwithstanding any other provision of this chapter, contracts of the Tennessee Valley Authority for the sale of fertilizer or electric power or related to the conduct or operation of the electric power system shall be excluded from the chapter.
(c) Foreign government or international organization contracts 
This chapter does not apply to a contract with a foreign government, or agency thereof, or international organization, or subsidiary body thereof, if the head of the agency determines that the application of the chapter to the contract would not be in the public interest.