Editorial Note on Part 173
Editorial Note: Nomenclature changes to part 173 appear at 70 FR 56098, Sept. 23, 2005.

§ 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 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 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: Packaging model
Minimum thickness; millimeters (inches) 1S, 2S
1.58 (0.062) 5A, 5B, 8A
3.17 (0.125) 12A, 12B
4.76 (0.187) 30B
7.93 (0.312) 48A, F, X, and Y
12.70 (0.500) 48T, O, OM, OM Allied, HX, H, and G
6.35 (0.250)
( 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) without loss or dispersal of the uranium hexafluoride; and
( iii ) Withstand the test specified in 10 CFR 71.73(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 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, 173.24a, and 173.421(a) and (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.
[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]