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Requirements for packages containing fissile material

Radiation Protection (Transport of Radioactive Materials) Regulations

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—(1) Packages containing fissile material shall meet the requirements prescribed elsewhere in these Regulations which pertain to the radioactive properties of the material and the requirements specified in paragraphs (3) to (6) and regulations 52, 53 and 54 unless excepted by regulation 17(6).(2) Fissile material shall be packaged and shipped in such a manner that subcriticality is maintained under conditions likely to be encountered during normal conditions of transport and in accidents. 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.(3) Where the chemical or physical form, isotopic composition, mass or concentration, moderation ratio or density, or geometric configuration is not known, the assessments of regulations 52, 53 and 54 shall be performed assuming that each parameter that is not known has the value which gives the maximum multiplication consistent with the known conditions and parameters in these assessments.(4) For irradiated nuclear fuel, the assessments of regulations 52, 53 and 54 shall be based on an isotopic composition demonstrated to provide —(a)the maximum neutron multiplication during the irradiation history; or(b)a conservative estimate of the neutron multiplication for the package assessments. After irradiation but prior to shipment, a measurement shall be performed to confirm the conservatism of the isotopic composition.(5) The packaging, after being subjected to the tests specified in paragraph 5 of Section E of the Fourth Schedule, must prevent the entry of a 10 cm cube.(6) The package shall be designed for an ambient temperature range of -40°C to +38°C unless the Chief Executive specifies otherwise in the certificate of approval for the package design.

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