Singapore legislation
Regulation 52
of Radiation Protection (Transport of Radioactive Materials) Regulations
Regulation 52
Assessment of individual package in isolation
Subregulation 1
For a package in isolation, it shall be assumed that water can leak into or out of all void spaces of the package, including those within the containment system. However, if the design incorporates special features to prevent such leakage of water into or out of certain void spaces, even as a result of error, absence of leakage may be assumed in respect of those void spaces.
Subregulation 2
For the purposes of paragraph (1), “special features” includes the following:
multiple high standard water barriers, each of which would remain watertight if the package were subject to the tests prescribed in regulation 54(b), a high degree of quality control in the manufacture, maintenance and repair of packagings, and tests to demonstrate the closure of each package before each shipment; or
for packages containing uranium hexafluoride only —
packages where, following the tests prescribed in regulation 54(b), there is no physical contact between the valve and any other component of the packaging other than at its original point of attachment and where, in addition, following the test prescribed in paragraph 7(3) of Section E of the Fourth Schedule the valves remain leaktight; and
a high degree of quality control in the manufacture, maintenance and repair of packagings coupled with tests to demonstrate closure of each package before each shipment.
Subregulation 3
It shall be assumed that the confinement system shall be closely reflected by at least 20 cm of water or such greater reflection as may additionally be provided by the surrounding material of the packaging. However, when it can be demonstrated that the confinement system remains within the packaging following the tests prescribed in regulation 54(b), close reflection of the package by at least 20 cm of water may be assumed in paragraph (4)(c).
Subregulation 4
The package shall be subcritical under the conditions of paragraphs (1), (2) and (3) with the package conditions that result in the maximum neutron multiplication consistent with —
routine conditions of transport (incident free);
the tests specified in regulation 53(b); and
the tests specified in regulation 54(b).
Subregulation 5
For packages to be transported by air —
the package shall be subcritical under conditions consistent with the tests prescribed in regulation 10(1) of Section E of the Fourth Schedule, assuming reflection by at least 20 cm of water but no water in-leakage; and
allowance shall not be made for special features of paragraphs (1) and (2) unless, following the tests specified in paragraph 10(1) of Section 5 of the Fourth Schedule, and subsequently, paragraph 9(3) of Section E of the Fourth Schedule, leakage of water into or out of the void spaces is prevented.