Table 4-4. Authorized Contents, in Kilograms (kg), and Conditions for Specification 6L

TM 55-315

Table 4-4. Authorized Contents, in Kilograms (kg), and Conditions for Specification 6L

are limited to the following amounts of fissile radioactive materials: 1.6 kilograms of uranium-235; 0.9 kilogram of

plutonium (except that, because of the 10-watt thermal decay heat limitation, the limit for plutonium-238 is 0.02

kilogram); and 0.5 kilogram of uranium-233. The maximum ratio of hydrogen to fissile material must not exceed 3,

including all sources of hydrogen within the DOT specification 2R container.

(b) Fissile Classes II and III. Maximum quantities of fissile materials for Fissile Classes II and III,

and other restrictions, are given in table 4-5. The table also shows the minimum transport index to be assigned for a

Fissile Class II package and the allowable number of similar packages per conveyance and per transport vehicle for a

Fissile Class IH shipment. Each Fissile Class III shipment is also subject to specific transport requirements (49 CFR

173.457) outlined in paragraph 4-15 of this manual. Where a maximum ratio of hydrogen to fissile material is specified

in table 4-5, only the hydrogen interspersed with the fissile material need be considered. For a uranium-233 shipment,

the maximum inside diameter of the inner container must not exceed 12.1 centimeters (4.75 inches). Where necessary,

a tight-fitting steel insert shall be used to reduce a larger diameter inner container to the 12-centimeter (4.75-inch) limit.

The larger diameter inner container used must conform to specification 2R or equivalent (cast iron or brass is prohibited),

with a maximum usable inside diameter of 13.3 centimeters(5.25 inches), a minimum usable inside diameter of 10

centimenters (4 inches), and a minimum height of 15 centimeters (6 inches) (49 CFR 178.104-3(b)).

Table 4-5. Authorized Contents for Specification 6M Packages

4-8