# The Radioactive Material (Road Transport) (Great Britain) Regulations 1996, Paragraph 1


Fissile material shall be packaged and shipped in such a manner that subcriticality is maintained under conditions likely to be encountered during normal and accident conditions of transport. The following contingencies shall be considered:
(a) Water leaking into or out of packages;
(b) The loss of efficiency of built-in neutron absorbers or moderators;
(c) Possible rearrangement of the radioactive contents either within the package or as a result of loss from the package;
(d) Reduction of spaces between packages or radioactive contents;
(e) Packages becoming immersed in water or buried in snow; and
(f) Possible effects of temperature changes.

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Source: https://www.legislation.gov.uk/uksi/1996/1350/schedule/7/paragraph/1 (the official version)
Page: https://openlegislation.uk/radioactive-material-road-transport-great-britain-regulations-1996/schedule-7/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.