Sellafield ltd has lost its appeal against fines levied against them last year.
In February, the company was fined £700,000 for sending bags of radioactive waste to a landfill site.
The bags, which contained waste such as plastic, tissues and clothing, should have been sent to a specialist facility that treats and stores low-level radioactive waste, but a number of management and operational failings led to them being sent to Lillyhall landfill site in Workington, Cumbria.
Today, the Lord Chief Justice Lord Thomas, sitting in the Court of Appeal with Mr Justice Mitting and Mrs Justice Thirlwall, said there were no grounds for criticising the level of fines imposed.
More top news
Political Editor Peter MacMahon speaks to Ruth Davidson, who's made the Scottish Tories the largest opposition group at Holyrood.
An additional 53 people, ranging from ages one to 86, are suspected to have been poisoned by raw milk from the farm's vending machine.
RSPB's Big Garden Birdwatch to take place over three days from 28 January. More than half a million people are expected to take part.