# The Radioactive Material (Road Transport) (Great Britain) Regulations 1996, Paragraph 2


A packaging for fissile material shall be so designed that, if it were subjected to the tests specified in paragraphs 6–11 of Part III of Schedule 15:
(a) Neither the volume nor any spacing on the basis of which nuclear criticality control for the purpose of paragraph 6(a) has been assessed would suffer more than 5% reduction, and the construction of the packaging would prevent the entry of a 10 cm cube; and
(b) Water would not leak into or out of any part of the package unless water in-leakage into or out-leakage from that part, to the optimum foreseeable extent, has been assumed for the purposes of paragraphs 5 and 6; and
(c) The configuration of the radioactive contents and the geometry of the containment system would not be altered so as to increase the neutron multiplication significantly.

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Source: https://www.legislation.gov.uk/uksi/1996/1350/schedule/7/paragraph/2 (the official version)
Page: https://openlegislation.uk/radioactive-material-road-transport-great-britain-regulations-1996/schedule-7/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.