No gas power station proposals should even be considered in north Wales unless Wylfa closes.

Neil Crumpton, Friends of the Earth Cymru

But Friends of the Earth Cymru said the decision to keep Wylfa running was regrettable.

FoEC spokesperson Neil Crumpton said the pressure group would like to see Wylfa closed down by the end of its current operating licence in 2004.

"No gas power station proposals should even be considered in north Wales unless Wylfa closes," said Mr Crumpton.

It was confirmed earlier this month that the Anglesey power station would be out of action for up to a month for checks on both its reactors.

Mystery marks were found in one reactor shut down for its annual overhaul.

The second reactor was closed as well as a precaution.

British Nuclear Fuels said there was no threat to safety.

The marks were found by a remote television camera.

There are four channels in each reactor core through which a television camera can be lowered during a reactor's annual overhaul.