Fergus O'Dowd (Louth, Fine Gael) | Oireachtas source

It states "after consultation with the institute", so I presume that the Minister could not stand over not listening to the advice. However, he or she has to make the regulations on the advice of the institute.

The section allows the Minister, in consultation with the RPII, to make regulations to exclude certain classes of low-risk nuclear materials from the requirements of this section. In other words, they would not all have to have security of a particular type if they were low risk. I presume that is what it means, that is, that there would not be a high risk to health and they would not be transporting any significant source of radiation that would affect health or have any other impact on the environment.