49 CFR 173.415
Authorized Type A packages.
The following packages are authorized for shipment if they do not contain quantities exceeding A1 or A2 as appropriate:
(a) DOT Specification 7A (§ 178.350 of this subchapter) Type A general packaging. Each offeror of a Specification 7A package must maintain on file for at least one year after the latest shipment, and shall provide to DOT on request, complete documentation of tests and an engineering evaluation or comparative data showing that the construction methods, packaging design, and materials of construction comply with that specification. Use of Specification 7A packagings designed in accordance with the requirements of § 178.350 of this subchapter in effect on June 30, 1983 (see 49 CFR part 178 revised as of October 1, 1982), is not authorized after April 1, 1997.
(b) Any other Type A packaging that also meets the applicable standards for fissile materials in 10 CFR part 71 and is used in accordance with § 173.471.
(c) Any Type B, B(U) or B(M) packaging authorized pursuant to § 173.416.
(d) Any foreign-made packaging that meets the standards in IAEA “Safety Series No. 6” and bears the marking “Type A” and was used for the import of Class 7 (radioactive) materials. Such packagings may be subsequently used for domestic and export shipments of Class 7 (radioactive) materials provided the offeror obtains the applicable documentation of tests and engineering evaluations and maintains the documentation on file in accordance with paragraph (a) of this section. These packagings must conform with requirements of the country of origin (as indicated by the packaging marking) and the IAEA regulations applicable to Type A packagings.