The United States conducted nuclear test explosions in the 1960s, 1970s and 1980s. Photo: AP PHOTO

The nuclear weapons testing ordered by US President Donald Trump won't involve nuclear explosions at this time.

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"I think the tests we're talking about right now are system tests," Energy Secretary Chris Wright said in an interview with Fox News on Sunday.

"These are not nuclear explosions. These are what we call non-critical explosions."

The US tests will be system tests, rather than nuclear explosions. (AP PHOTO)

The testing involves all the other parts of a nuclear weapon to make

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