Regulation 48

The design of Type B(U) packages shall, in addition to meeting the requirements of regulation 42 and, where applicable, regulation 43, meet the requirements of paragraphs (2) to (8), (11) to (18) and regulations 47(2) to (15).

A Type B(U) package shall be so designed that, if it were subjected to the tests in paragraph 7 of Section E of the Fourth Schedule, it would retain sufficient shielding to ensure that the radiation level at 1 m from the surface of the package would not exceed 10 mSv/h with the maximum radioactive contents which the package is designed to carry.

A Type B(U) package shall be so designed that, under the ambient conditions specified in paragraphs (5) and (6), heat generated within the package by the radioactive contents shall not, under normal conditions of transport, as demonstrated by the tests in paragraph 5 of Section E of the Fourth Schedule, adversely affect the package in such a way that it would fail to meet the applicable requirements for containment and shielding if left unattended for a period of one week. Particular attention shall be paid to the effects of heat which may —

Except as required in regulation 43(1) a Type B(U) package shall be so designed that, under the ambient condition specified in paragraph (5), the temperature of the accessible surfaces of the package shall not exceed 50°C, unless the package is transported under exclusive use.

In applying paragraphs (3) and (4), the ambient temperature shall be assumed to be 38°C.

In applying paragraph (3), the solar insolation conditions shall be assumed to be as specified in Table 8 of the Third Schedule.

A Type B(U) package which includes thermal protection for the purpose of satisfying the requirements of the thermal test specified in paragraph 7(3) of Section E of the Fourth Schedule shall be so designed that such protection will remain effective if the package is subjected to the tests specified in paragraphs 5 and 7(2)(a) and (b) or 7(2)(b) and (c) of Section E of the Fourth Schedule, as appropriate. Any such protection on the exterior of the package shall not be rendered ineffective by conditions likely to be encountered in routine handling or transport, or in accidents, and which are not simulated in the tests referred to above, such as by ripping, cutting, skidding, abrasion or rough handling.

A Type B(U) package shall be so designed that, if it were subjected to —

Where mixtures of different radionuclides are present, the provisions of paragraphs 2 to 4 of Section B of the Second Schedule shall apply except that for krypton-85, an effective A2 value equal to 10 A2 may be used.

For the purposes of paragraph (8)(a), the limits of non-fixed contamination on external surfaces shall be taken into account.

A Type B(U) package for radioactive contents with activity greater than 105 A2 shall be so designed that, if it were subjected to the enhanced water immersion test specified in paragraph 8 of Section E of the Fourth Schedule, there would be no rupture of the containment system.

Compliance with the permitted activity release limits shall depend neither upon filters nor upon a mechanical cooling system.

A Type B(U) package shall not include a pressure relief system from the containment system which would allow the release of radioactive material to the environment under the conditions of the tests specified in paragraphs 5 and 7 of Section E of the Fourth Schedule.

A Type B(U) package shall be so designed that if it were at the maximum normal operating pressure and it were subjected to the tests specified in paragraphs 5 and 7 of Section E of the Fourth Schedule, the level of strains in the containment system would not attain values which would adversely affect the package in such a way that it would fail to meet the applicable requirements.

A Type B(U) package shall not have a maximum normal operating pressure in excess of a gauge pressure of 700 kPa.

The temperature of any accessible surface during transport of a Type B(U) package shall not exceed 85°C in the absence of insolation under the ambient temperature of 38°C unless the package is carried under exclusive use or by air. Account may be taken of barriers or screens to give protection to transport workers without barriers or screens being subject to any test.

A Type B(U) package containing low dispersible radioactive material shall be so designed that any features added to the low dispersible radioactive material that are not part of it, or any internal components of the packaging shall not adversely affect the performance of the low dispersible radioactive material.

A Type B(U) package shall be designed for an ambient temperature range from -40°C to +38°C.