`` Potential security situation '' led to lockdown , plant says in release . Pantex Plant is the nation 's only nuclear weapons assembly , disassembly facility . It was built by a consortium of U.S. and Canadian companies including General Electric ( GE - news - people ) and Honeywell International ( HON - news - people ).
`` Potential security situation '' led to lockdown , plant says in release . Pantex Plant is the nation 's only nuclear weapons assembly , disassembly facility . Plant supplies U.S. Department of Energy/National Nuclear Security Administration .