Singapore legislation
Regulation 54
of Radiation Protection (Transport of Radioactive Materials) Regulations
Regulation 54
Assessment of package arrays under accident conditions of transport
A number “N” shall be derived, such that 2 times “N” shall be subcritical for the arrangement and package conditions that provide the maximum neutron multiplication consistent with the following:
hydrogenous moderation between packages, and the package arrangement reflected on all sides by at least 20 cm of water;
the tests specified in paragraph 5 of Section E of the Fourth Schedule followed by whichever of the following is the more limiting:
the tests specified in paragraph 6(2)(b) of Section E of the Fourth Schedule and either paragraph 6(2)(c) of Section E of the Fourth Schedule for having a mass not greater than 500 kg and an overall density not greater than 1000 kg/m3 based on the external dimensions, or paragraph 6(2)(a) of Section E of the Fourth Schedule for all other packages; followed by the test specified in paragraph 6(3) of Section E of the Fourth Schedule and completed by the tests specified in paragraph 9 of Section E of the Fourth Schedule; or
the test specified in paragraph 7(4) of Section E of the Fourth Schedule; and
where any part of the fissile material escapes from the containment system following the tests specified in paragraph (b), it shall be assumed that fissile material escapes from each package in the array and all of the fissile material shall be arranged in the configuration and moderation that results in the maximum neutron multiplication with close reflection by at least 20 cm of water.