The Government is to begin its attempt to stop the commissioning of the MOX plant at Sellafield tomorrow.
The Attorney General Mr Michael McDowell will lead the Government bid at a United Nations Tribunal for the Law of the Sea, in Germany.
Mr McDowell will call for an immediate suspension of the scheduled commissioning of the MOX plant on December 20th.
Inter-governmental representations over the MOX venture have made repeatedly in recent months and have included discussions on the issue involving the Taoiseach and the British Prime Minister Mr Tony Blair.
Government concerns centre of the threat of radio active pollution in the Irish Sea and more recently have centred on the prospect of a terrorist threat on the plant and the possible fallout effects for Ireland.
Last week, however, the Greenpeace and Friends of the Earth movements lost a High Court action in London aimed at stopping the MOX project.
Both organisations said they would take their case to the Court of Appeal.
PA