From the BBC.
“It said there were no injuries and no risk to local residents and production was unaffected.”
“The Welsh Ambulance Service said it attended the scene, but nobody required treatment.
David TC Davies, MP for Monmouth, said the explosion occurred “in a remote part of the site that had been set aside to take apart shells”.
“I am told there is always a small risk involved in this particular operation, which is exactly why it is carried out with remote control in a restricted area of the site. There were no risks to any members of the public,” he added.”
Thanks for finding that info and posting it.