---
kind: "section"
citation: "49 C.F.R. § 173.420"
title: "49"
number: "173.420"
heading: "Uranium hexafluoride (fissile, fissile excepted and non-fissile)."
url: "https://uscodex.org/cfr/49/173.420"
---

# §173.420. Uranium hexafluoride (fissile, fissile excepted and non-fissile).

- (a) In addition to any other applicable requirements of this subchapter, quantities greater than 0.1 kg of fissile, fissile excepted or non-fissile uranium hexafluoride must be offered for transportation as follows:
  - (1) Before initial filling and during periodic inspection and test, packagings must be cleaned in accordance with American National Standard N14.1 (IBR, see [§ 171.7](/cfr/49/171.7.md) of this subchapter).
  - (2) Packagings must be designed, fabricated, inspected, tested and marked in accordance with—
    - (i) American National Standard N14.1 in effect at the time the packaging was manufactured; or
    - (ii) [Reserved]
    - (iii) Section VIII of the ASME Code (IBR, see [§ 171.7](/cfr/49/171.7.md) of this subchapter), provided the packaging—
      - (A) Was manufactured on or before June 30, 1987;
      - (B) Conforms to the edition of the ASME Code in effect at the time the packaging was manufactured;
      - (C) Is used within its original design limitations; and
      - (D) Has shell and head thicknesses that have not decreased below the minimum value specified in the following table:
  - (3) Each package shall be designed so that it will:
    - (i) Withstand a hydraulic test at an internal pressure of at least 1.4 MPa (200 psig) without leakage;
    - (ii) Withstand the test specified in [§ 173.465(c)](/cfr/49/173.465.md?p=c) without loss or dispersal of the uranium hexafluoride; and
    - (iii) Withstand the test specified in [10 CFR 71.73(c)(4)](/cfr/10/71.73.md?p=c-4) without rupture of the containment system.
  - (4) Uranium hexafluoride must be in solid form.
  - (5) The volume of solid uranium hexafluoride, except solid depleted uranium hexafluoride, at 20 °C (68 °F) may not exceed 61% of the certified volumetric capacity of the packaging. The volume of solid depleted uranium hexafluoride at 20 °C (68 °F) may not exceed 62% of the certified volumetric capacity of the packaging.
  - (6) The pressure in the package at 20 °C (68 °F) must be less than 101.3 kPa (14.7 psia).
- (b) Each packaging for uranium hexafluoride must be periodically inspected, tested, marked and otherwise conform with the American National Standard N14.1.
- (c) Each repair to a packaging for uranium hexafluoride must be performed in accordance with the American National Standard N14.1.
- (d) Uranium hexafluoride not exceeding the limits specified in the limited quantity package limits column of table 4 in [§ 173.425](/cfr/49/173.425.md) may be classified as UN 3507, Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg (0.22 pounds) per package, non-fissile or fissile-excepted, provided that:
  - (1) The mass of uranium hexafluoride in the package is less than 0.1 kg (0.22 pounds); and
  - (2) The conditions of §§ [173.24](/cfr/49/173.24.md), [173.24a](/cfr/49/173.24a.md), and [173.421(a)](/cfr/49/173.421.md?p=a) and [(d)](/cfr/49/173.421.md?p=d) are met.
- (e) For a package containing 0.1 kg or more of UF6, the proper shipping name and UN number “Radioactive material, uranium hexafluoride, UN 2978” must be used for the transportation of non-fissile or fissile-excepted uranium hexafluoride and the proper shipping name and UN number “Radioactive material, uranium hexafluoride, fissile, UN 2977” must be used for the transport of fissile uranium hexafluoride.

## Notes

### Amendments

[69 FR 3675, Jan. 26, 2004; 69 FR 55118, Sept. 13, 2004, as amended at 79 FR 40612, July 11, 2014; 80 FR 1162, Jan. 8, 2015; 80 FR 72928, Nov. 23, 2015]

### Source

Source: Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 5101-5128, 44701; 49 CFR 1.81, 1.96 and 1.97.

### Amendments

[69 FR 3675, Jan. 26, 2004; 69 FR 55118, Sept. 13, 2004, as amended at 79 FR 40612, July 11, 2014; 80 FR 1162, Jan. 8, 2015; 80 FR 72928, Nov. 23, 2015]