10 C.F.R. § 71.64
(a) A package for the shipment of plutonium by air subject to § 71.88(a)(4), in addition to satisfying the requirements of §§ 71.41 through 71.63, as applicable, must be designed, constructed, and prepared for shipment so that under the tests specified in—
(1) Section 71.74 (“Accident conditions for air transport of plutonium”)—
(b) With respect to the package requirements of paragraph (a), there must be a demonstration or analytical assessment showing that—
(1) The results of the physical testing for package qualification would not be adversely affected to a significant extent by—