There are multiple positions posted for radiochemists/nuclear engineers at SRNL. All require the ability to qualify for a Q clearance.
https://sjobs.brassring.com/TGnewUI/Search/Home/Home?partnerid=25264&siteid=5259#jobDetails=1238654_5259 Req ID #:4941BR
And the following 2 positions also require an initial 2-year posting to LANL