This article is in response to Trump's declaration that the USA is starting nuclear weapons testing, the the energy secretary clarified that these are "non-critical" tests, i.e. they are testing the non-nuclear parts of the weapon but will not be causing any nuclear explosions.

https://www.bbc.com/news/articles/cpd26yxxx3lo

"These are not nuclear explosions," Wright told Fox News on Sunday. "These are what we call non-critical explosions."

"Americans near historic test sites such as the Nevada National Security Site have no cause for concern," Wright said. "So you're testing all the other parts of a nuclear weapon to make sure they deliver the appropriate geometry, and they set up the nuclear explosion."