Paragraph 4

The number of category II-YELLOW and category III-YELLOW packages, overpacks, tanks and freight containers containing fissile material stored in any one storage area, such as a transit area, terminal building, store-room or assembly yard, shall be so limited that the total sum of the Transport Indexes (TI) in any individual group of such packages, overpacks, tanks or freight containers does not exceed 50. Groups of such packages, overpacks, tanks and freight containers shall be stored so as to maintain a spacing of at least 6 metres from other groups of such packages, overpacks, tanks or freight containers.