The company used the reactor to test chemicals and perform radiography tests, according to the Nuclear Regulatory Commission, but even such benign uses are extremely rare.

FORBES: Corporations Of Mass Destruction: Eastman Kodak Operated A Nuclear Reactor With Weapons-Grade Uranium For 30 Years

The exercise, with a command centre in Poundbury, Dorchester, will test their response to the scenario of a radioactive leak from a submarine with a damaged nuclear reactor core.

BBC: Nuclear submarine accident exercise in Portland