A union is warning that the North Devon site could be closed next month and is accusing the government of "shipwrecking" UK dockyards.
An online petition to save the dockyard from closure has already been signed by more than seven thousand people.
A controlled explosion has taken place this lunchtime in Tewkesbury after a suspected mortar/rifle grenade was found.
Police have confirmed the Explosive Ordnance Disposal team carried out the explosion near to Lower Lode Lane and the River Severn shortly after 12:30pm.
Cordons around the area are due to be lifted shortly.
