CONSULTANTS working for the UK Government have earmarked Aberthaw in the Vale of Glamorgan as a potential site for a new nuclear power station, according to an industry source.
The Department of Trade and Industry said there were no plans to build any new nuclear power stations.
"We are conducting an energy review. The review is to see whether there should be a nuclear element to Britain's energy plan, and it would be a bit odd to identify sites for nuclear power stations at this time."
But the industry source told the Western Mail, "There is a document in existence which identifies Aberthaw as a suitable location for a nuclear power station. It's an academic exercise which looks purely at the technical case, without considering the political impact.
"From a technical point of view, Aberthaw would be an ideal site. There is an existing conventional power station there with good communications and infrastructure."
Energy is not a devolved issue and any decision relating to the construction of new nuclear power stations would be taken by the Westminster government.
Nevertheless, Conservative Assembly leader Nick Bourne has failed in a bid to have disclosed to him details of discussions that took place last year between Assembly Economic Development Minister Andrew Davies and UK Energy Minister Malcolm Wicks.
A request made by Mr Bourne under freedom of information legislation was rejected on the grounds that it would "cause substantial harm to its [the Assembly Government's] relationship with central government".
Mr Bourne said, "It is obvious from the portcullis I have come up against that there have been discussions about nuclear power in Wales. It is a matter of regret that the Government is choosing not to disclose them.
"This silence is clearly going to cause great concern to people in Wales as it is obvious that the Government has something to hide. Labour ministers must come clean and reveal the nature of these discussions.
"We already know of the Welsh Assembly Government's obsession with covering Wales with wind farms instead of looking at other forms of renewable energy. Now it seems they may also have a secret agenda with nuclear power. If this is not the case then they should say so now.
"Andrew Davies has already shown breathtaking inconsistency by on the one hand advocating an anti-nuclear policy in Wales while at the same time seeking permission to extend the life of the Wylfa nuclear power station.
"Any decisions on nuclear power must be taken on a properly informed, open and transparent basis.
"This is too important an issue to be kept secret. There are inevitable public concerns about nuclear power and it is vital the Government reassures people about its plans."
An Assembly Government spokesman said, "We are not aware of any suggestion that a nuclear power station might be built at Aberthaw, and we would not be in favour of any such plan.
"We had our own energy review last autumn, which was criticised for not containing any reference to nuclear at all.
"The situation at Wylfa is different. There is an existing nuclear power station there and we have expressed interest in a possible extension of its lifespan because of the threat to jobs at the plant itself and at Anglesey Aluminium."
In December a UK Government source told the Western Mail that Wylfa had been earmarked for a new nuclear power station. Energy Minister Malcolm Wicks denied that was the case.
The current Aberthaw Power Station uses coal from Tower Colliery, which is expected to close down within three years.