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Determination of transport index and criticality safety index

Radiation Protection (Transport of Radioactive Materials) Regulations

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—(1) The transport index based on radiation exposure control for a package, overpack, tank, freight container, or for unpackaged LSA-I or SCO-I, shall be the number derived in accordance with the following procedure:(a)the maximum radiation level at a distance of 1 m from the external surfaces of the package, overpack, tank, freight container, or unpackaged LSA-I and SCO-I shall first be determined, and —(i)where the radiation level is determined in units of millisievert per hour, the value determined shall be multiplied by 100; and(ii)for uranium and thorium ores and concentrates, the maximum radiation level at any point 1 m from the external surface of the load may be taken as —0.4 mSv/h for ores and physical concentrates of uranium and thorium; 0.3 mSv/h for chemical concentrates of thorium; and 0.02 mSv/hfor chemical concentrates of uranium, other than uranium hexafluoride;(b)for tanks, freight containers and unpackaged LSA-I and SCO-I of such size specified in the first column of Table 4 of the Third Schedule, the value determined in sub-paragraph (a) shall be multiplied by the appropriate multiplication factor specified in relation thereto in the second column of that Table; and(c)the figure obtained in sub-paragraphs (a) and (b) shall be rounded up to the first decimal place, except that a value of 0.05 or less may be considered as zero.(2) The transport index for each overpack, freight container or conveyance shall be determined as either the sum of the TIs of all the packages contained, or by direct measurement of radiation level, except in the case of non-rigid overpacks for which the transport index shall be determined only as the sum of the TIs of all the packages.(3) The criticality safety index (CSI) for packages containing fissile material shall be obtained by dividing the number 50 by the value of N which shall be derived in accordance with regulations 53 and 54. The value of the criticality safety index may be zero, provided that an unlimited number of packages is subcritical, that is to say, N is effectively equal to infinity.(4) The criticality safety index for each consignment shall be determined as the sum of the CSIs of all the packages contained in that consignment.

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