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.

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The consortium had been divided over where to put the test reactor, and competition was intense.

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Eight of the more than 9, 700 tubes in one of the unit 3 generators failed a pressure test, while six tubes in unit 2's reactor needed to be plugged, the NRC has found.

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In order to advance in rank or earn a specific qualification insignia such as lead the watch team in the reactor plant, a qualification board is organized with a sailors superiors and qualified peers to test his or her knowledge.

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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.

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