33. Packages containing uranium hexafluoride shall not contain any of the following:
(a) A mass of uranium hexafluoride greater than a value that would lead to unfilled space(ullage) smaller than 5% at the maximum temperature of the package as specified for the plant where the package shall be used;
(b) Uranium hexafluoride other than in solid form or at an internal pressure above atmospheric pressure when presented for transport; and
(c) A mass of uranium hexafluoride different from that authorized for the package design.