§176.704 Requirements relating to transport indices and criticality safety indices.

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(a) The sum of the transport indices (TI’s) for all packages of Class 7 (radioactive) materials on board a vessel may not exceed the limits specified in Table IIIA of this section.

(b) For freight containers containing packages and overpacks of Class 7 (radioactive) materials, the radiation level may not exceed 2 mSv per hour (200 mrem per hour) at any point on the outside surface and 0.1 mSv per hour (10 mrem per hour) at 2 m (6.6 ft) from the outside surface of the freight container.

Type of freight container or conveyance	Limit on total sum of transport indices in a single freight container or aboard a conveyance
Type of freight container or conveyance	Not under exclusive use	Under exclusive use
I. Freight container–small	50	N/A.
II. Freight container–large	50	No limit.
III. Vessel:^{a b}
1. Hold, compartment or defined deck area:
i. Packages, overpacks, small freight containers	50	No limit.
ii. Large freight containers	200	No limit.
2. Total vessel:
i. Packages, overpacks, small freight containers	200	No limit.
ii. Large freight containers	No limit	No limit.
Notes:
^a For vessels, the requirements in both 1 and 2 must be fulfilled.
^b Packages or overpacks transported in or on a vehicle which are offered for transport in accordance with the provisions of §173.441(b) of this subchapter may be transported by vessels provided that they are not removed from the vehicle at any time while on board the vessel.

Type of freight container or conveyance	Limit on total sum of criticality safety indices in a single freight container or aboard a conveyance
Type of freight container or conveyance	Not under exclusive use	Under exclusive use
I. Freight container–small	50	N/A.
II. Freight container–large	50	100.
III. Vessel:^{a b}
1. Hold, compartment or defined deck area:
i. Packages, overpacks, small freight containers	50	100.
ii. Large freight containers	50	100.
2. Total vessel:
i. Packages, overpacks, small freight containers	200^c	200^d.
ii. Large freight containers	No limit^c	No limit^d.
Notes:
^a For vessels, the requirements in both 1 and 2 must be fulfilled.
^b Packages or overpacks transported in or on a vehicle which are offered for transport in accordance with the provisions of §173.441(b) of this subchapter may be transported by vessels provided that they are not removed from the vehicle at any time while on board the vessel. In that case, the entries under the heading “under exclusive use” apply.
^c The consignment must be handled and stowed such that the total sum of CSIs in any group does not exceed 50, and such that each group is handled and stowed so that the groups are separated from each other by at least 6 m (20 ft).
^d The consignment must be handled and stowed such that the total sum of CSIs in any group does not exceed 100, and such that each group is handled and stowed so that the groups are separated from each other by at least 6 m (20 ft). The intervening space between groups may be occupied by other cargo.