Constitutional practicability of referendum on EU Constitution

Yes. Binding referendum provided for any transfer of power because that requires a constitutional amendment which makes a referendum mandatory.

Regulation about a special transfer of sovereignty to EU

A decision taken by the European Council to establish a common defence shall not be adopted if Ireland would be included, Art. 29 IV 9 ConstIreland.

Approval of transfer of sovereignty without effect of constitutional amendment

Majority from both chambers, Art. 29 V, VI ConstIreland.

Approval of transfer of sovereignty with effect of constitutional amendment

Not expressly regulated, but constitutional amendment required.

Approval of constitutional amendment

Majority from both chambers and by mandatory and binding referendum, Art. 46, 47 ConstIreland.

Other constitutional regulations about referendums

Any bill not amending the constitution can be given to a referendum on demand of a majority of the members of parliament or not less than 1/3 of the members of senate, Art. 27 ConstIreland.