no (at least not that we know of). However their uranium resources have been utilized in the manufacturing nuclear weapons (though the mine that supplied uranium has been closed since 1960). There are some concerns of illegal mining activity, but they do not pose a major threat in the issue of nuclear programs. Democratic Republic of the Congo signed the Comprehensive Nuclear Test Ban Treaty, the Nuclear Non-Proliferation Treaty and also has signed but not yet ratified the African Nuclear Weapons Free Zone (Treaty of Pelindaba).
just Google it (:
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