The engineering giant’s board will meet this week to discuss the increasing costs and further action on the Anglesey prpjects, according to reports in Japan.
A decision to pull out of the North Wales nuclear power station project would be a major blow to the Government, which hoped to build a next generation of reactors.
Last month NuGen abandoned plans to build a nuclear plant at Moorside, next to Sellafield.
The decision would leave just Sellafield, Bradwell and Oldbury as pipeline schemes after Hinkley Point in Somerset.
The decision would be a big blow to consultant Atkins which is delivering civil engineering design and KBR and Wood, both working up key elements of design
Around 9,000 workers were expected to be involved in building two nuclear reactors on Anglesey.