# The Packaging, Labelling and Carriage of Radioactive Material by Rail Regulations 1996, Paragraph 2


The mark shall be of the following generalised type— “VRI/Number/Type Code”, where—
(a) “VRI” represents the international vehicle registration identification code of the state issuing the certificate;
(b) “Number” represents the number assigned by the competent authority, which shall be unique with regard to the particular design or shipment; and
(c) “Type Code” represents the code used to indicate the type of approval certificate issued as follows—
AF
Type A package design for fissile material
B(U)
Type B(U) package design, (B(U)F if for fissile material)
B(M)
Type B(M) package design, (B(M)F if for fissile material)
IF
Industrial package design for fissile material
S
Special form radioactive material
T
Shipment
X
Special arrangement

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Source: https://www.legislation.gov.uk/uksi/1996/2090/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/packaging-labelling-and-carriage-of-radioactive-material-by-rail-regulations-1996/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.