Openings, valves and caps of tank containers and tank wagons to be securely closed
26.—(1) Subject to paragraph (3), the operator of any tank container or tank wagon which is being used for the carriage of radioactive material shall ensure that—
(a)all openings in the tank container or tank wagon concerned; and
(b)in the case where any discharge or filling opening in the tank container or tank wagon concerned is fitted with more than one valve or is fitted with a cap, all such valves and that cap,
are securely closed prior to carriage.
(2) Subject to paragraph (3), the operator of any train which is being used for the carriage of any tank container or tank wagon containing radioactive material shall take all reasonable steps to ensure that—
(a)all openings in the tank container or tank wagon concerned; and
(b)in the case where any discharge or filling opening in the tank container or tank wagon concerned is fitted with more than one valve or is fitted with a cap, all such valves and that cap,
remain securely closed throughout carriage.
(3) Nothing in paragraphs (1) and (2) shall be taken as permitting the proper functioning of any safety device to be compromised.