###### Editorial Note on [Part 173](/current/title-49/part-173?toc=1)

#### Editorial Note:

Nomenclature changes to part 173 appear at [70 FR 56098](https://www.federalregister.gov/citation/70-FR-56098), Sept. 23, 2005.

#### § 173.417 Authorized fissile materials packages.

(a) Except as provided in [§ 173.453](/on/2024-09-24/title-49/section-173.453), fissile materials containing not more than A1 or A2 as appropriate, must be packaged in one of the following packagings:

(1)

(i) Any packaging listed in [§ 173.415](/on/2024-09-24/title-49/section-173.415), limited to the Class 7 (radioactive) materials specified in [10 CFR part 71, subpart C](/on/2024-09-24/title-10/part-71/subpart-C);

(ii) Any Type AF, Type B(U)F, or Type B(M)F packaging that meets the applicable standards for fissile material packages in [10 CFR part 71](/on/2024-09-24/title-10/part-71); or

(iii) Any Type AF, Type B(U)F, or Type B(M)F packaging that meets the applicable requirements for fissile material packages in Section VI of the International Atomic Energy Agency “Regulations for the Safe Transport of Radioactive Material, SSR-6 (IBR, see [§ 171.7 of this subchapter](/on/2024-09-24/title-49/section-171.7)),” and for which the foreign Competent Authority certificate has been revalidated by the U.S. Competent Authority, in accordance with [§ 173.473](/on/2024-09-24/title-49/section-173.473). These packages are authorized only for export and import shipments.

(2) A residual “heel” of enriched solid uranium hexafluoride may be transported without a protective overpack in any metal cylinder that meets both the requirements of [§ 173.415](/on/2024-09-24/title-49/section-173.415) and [§ 178.350 of this subchapter](/on/2024-09-24/title-49/section-178.350) for Specification 7A Type A packaging, and the requirements of [§ 173.420](/on/2024-09-24/title-49/section-173.420) for packagings containing greater than 0.1 kg of uranium hexafluoride. Any such shipment must be made in accordance with Table 2, as follows:

Table 2—Allowable Content of Uranium Hexafluoride (UF6 “Heel” in a Specification 7A Cylinder)

| Maximum cylinder diameter | | Cylinder volume | | Maximum Uranium 235-enrichment (weight) percent | Maximum “Heel” weight per cylinder | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Centimeters | Inches | Liters | Cubic feet | UF6 | | Uranium-235 | |
| kg | lb | kg | lb |
| 12.7 | 5 | 8.8 | 0.311 | 100.0 | 0.045 | 0.1 | 0.031 | 0.07 |
| 20.3 | 8 | 39.0 | 1.359 | 12.5 | 0.227 | 0.5 | 0.019 | 0.04 |
| 30.5 | 12 | 68.0 | 2.410 | 5.0 | 0.454 | 1.0 | 0.015 | 0.03 |
| 76.0 | 30 | 725.0 | 25.64 | 5.0 | 11.3 | 25.0 | 0.383 | 0.84 |
| 122.0 | 48 | 3,084.0 | 1 108.9 | 4.5 | 22.7 | 50.0 | 0.690 | 1.52 |
| 122.0 | 48 | 4,041.0 | 2 142.7 | 4.5 | 22.7 | 50.0 | 0.690 | 1.52 |
| | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 10 ton. | | | | | | | | |
| 2 14 ton | | | | | | | | |

(b) Fissile Class 7 (radioactive) materials with radioactive content exceeding A1 or A2 must be packaged in one of the following packagings:

(1) Type B(U), or Type B(M) packaging that meets the standards for packaging of fissile materials in [10 CFR part 71](/on/2024-09-24/title-10/part-71), and is approved by the U.S. Nuclear Regulatory Commission and used in accordance with [§ 173.471](/on/2024-09-24/title-49/section-173.471);

(2) Type B(U) or Type B(M) packaging that also meets the applicable requirements for fissile material packaging in Section VI of the International Atomic Energy Agency “Regulations for the Safe Transport of Radioactive Material, SSR-6,” and for which the foreign Competent Authority certificate has been revalidated by the U.S. Competent Authority in accordance with [§ 173.473](/on/2024-09-24/title-49/section-173.473). These packagings are authorized only for import and export shipments.

(c) A package approved by the U.S. Nuclear Regulatory Commission under a special package authorization granted in accordance with [10 CFR 71.41(d)](/on/2024-09-24/title-10/section-71.41#p-71.41(d)) provided it is offered only for domestic transportation in accordance with the requirements in [§ 173.471(b)](/on/2024-09-24/title-49/section-173.471#p-173.471(b)) and [(c)](/on/2024-09-24/title-49/section-173.471#p-173.471(c)).

[[69 FR 3673](https://www.federalregister.gov/citation/69-FR-3673), Jan. 26, 2004; [69 FR 55118](https://www.federalregister.gov/citation/69-FR-55118), Sept. 13, 2004, as amended at [79 FR 40612](https://www.federalregister.gov/citation/79-FR-40612), July 11, 2014; [80 FR 1163](https://www.federalregister.gov/citation/80-FR-1163), Jan. 8, 2015; [80 FR 72928](https://www.federalregister.gov/citation/80-FR-72928), Nov. 23, 2015]