Table 4-6. Authorized Quantities of Uranium Hexafluoride (UF6) as Fissile Class II

TM 55-315

Table 4-6. Authorized Quantities of Uranium Hexafluoride (UF6) as Fissile Class II

(3) Type B, B(U), or B(M) packaging that meets the standards of 10 CFR 71 for packaging fissile materials

and that meets the requirements of the US Nuclear Regulatory Commission approved packages (49 CFR 173.471).

(4) Type B(U) or B(M) packaging that meets the applicable requirements for fissile radioactive materials in

section VI of the International Atomic Energy Agency (IAEA) Regulations for the Safe Transport of Radioactive Materials,

Safety Series No. 6 and for which the foreign competent authority certificate has been revalidated by the Director, Office

of Hazardous Materials Transportation (OHMT) in accordance with 49 CFR 173.472. Authorized only for import and

export shipments.

(5) DOT specification 20PF-1, 20PF-2, or 20PF-3 (49 CFR 178.120) or specification 21PF-1 or 21PF-2 (49

CFR 178.121) phenolic-foam insulated protective overpacks, with snug-fitting inner metal cylinders meeting the standard

requirements for all packages (49 CFR 173.24), general design requirements (49 CFR 173.411), and the additional

design requirements for Type A packages (49 CFR 173.412). Handling procedures and packaging criteria shall be

according to the US Department of Energy Report No. ORO-651 or NASI Standard N-14.1-1971. Quantities of uranium

hexafluoride are authorized as shown in table 4-6, with each package to be shipped as Fissile Class II, and assigned a

minimum transport index as also shown.

4-14. Mixing and Combining Packages of Fissile Materials (49 CFR 173.459)

a. Mixing of packages of other types of radioactive materials, including Fissile Class I with Fissile Class II

packages, is permitted if the total transport index in any one transport vehicle or storage location does not exceed 50.

b. For Fissile Class II packages shipped under the exclusive-use provisions of 49 CFR 173.441(b) to provide for

packages with high radiation dose rates, the transport index, which is calculated for nuclear criticality control purposes,

must not exceed 10 for any single package or a total of 50 for the full load, unless specifically authorized by DOT for

Fissile Class III shipments.

(1) Fissile Class II packages may be shipped with a transport index greater than 10 and combined with other

packages of the same or different designs in a Fissile Class III shipment, under the conditions prescribed in paragraph 4-

13b(3) above, provided:

(a) The transport index assigned in the package approval for nuclear criticality control purposes does not

exceed 10 for any single package;

(b) The total transport index for all packages in the shipment does not exceed 100;

(c) The shipment satisfies the provisions of 49 CFR 173.441(b) if any package has radiation dose rates

that exceed 10 millirems per hour at 1 meter from any accessible external surface of the package; and

(d) The shipment will not be transported by water

(2) Fissile Class III packages that have been assigned a transport index for nuclear criticality control purposes,

according to Fissile Class II criteria, may be combined with other Fissile Class III packages of the same or different

design for which a transport index has been so assigned for nuclear criticality control purposes, and may be combined

with Fissile Class II packages, in a Fissile Class III shipment under the condition prescribed in paragraph 4-15 below

provided:

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