No liability shall arise under this Convention for damage caused by a nuclear incident:
(a)if the operator of a nuclear installation is liable for such damage under either the Paris Convention of 29 July 1960 on Third Party Liability in the Field of Nuclear Energy as amended by its Additional Protocol of 28 January 1964, or the Vienna Convention of 21 May 1963 on Civil Liability for Nuclear Damage, or
(b)if the operator of a nuclear installation is liable for such damage by virtue of a national law governing the liability for such damage, provided that such law is in all respects as favourable to persons who may suffer damage as either the Paris or the Vienna Conventions.