Nuclear waste storage facility told to take action after breach

Martin Walkingshaw, chief operating officer at NWS, said: “Placing the engineered cap over the legacy radioactive waste disposal facilities at the UK’s LLWR is a first of its kind activity for the UK.”

He said Nuclear Waste Services were engaged with the Environment Agency on a regular basis about progress.

He added: “Capping is a key part of the disposal, and we are currently implementing the required design by procuring, importing and emplacing thousands of tonnes of capping materials in line with our planning conditions and stringent quality requirements.”

In their letter, the Environment Agency also told LLWR it had failed to meet a deadline for a previously imposed improvement condition, regarding a request for a written plan to protect waste in certain areas, including capping one of them.

While the plan was delivered, there were delays in implementing it.

An initial date of completion of 2028 had been agreed with the EA, but discussions are now under way to extend the deadline as LLWR believes more time is needed.

NWS has blamed delays on issues with the design of the engineered cap.

“Throughout the design phase a number of assumptions were tested, as is common practice. Not all of these assumptions held true, and one in particular, caused a significant change in design.”