Ontario Power Generation has cleared another hurdle on its way to a possible refurbishment of the four reactors on the 'B' side of the Pickering nuclear station. The Canadian Nuclear Safety Commission, the federal regulator, accepted the conclusions of an environmental assessment conducted by OPG that the refurbishment work won't impact the environment. In its ruling, the CNSC stated the refurbishment "is not likely to cause significant adverse environmental effects," provided mitigating measures are taken. OPG is studying the p