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Thank you for your interest in contacting CTOS. If you would like to:

  • Learn about new or upcoming CTOS courses
  • Submit a suggestion
  • Have a question concerning our training

Please provide your information below and a CTOS representative will gladly contact you. You may also find answers to your inquiries through our FREQUENTLY ASKED QUESTIONS (FAQs) page.



CTOS Registration Desk  

HOURS OF OPERATION: Mon-Thu, 7:00am-5:00pm (PST)
PHONE:  1(877)WMD-CTOS /  1(877) 963-2867  

E-MAIL:  ctosreg@nv.doe.gov
For Emergencies after-hours and weekends please call:  (702) 409-9087

CTOS Mobile Training Registration Desk 
E-MAIL:  ctosmttreg@nv.doe.gov 

CTOS Indirect Training Desk  
E-MAIL: ctosindirect@nv.doe.gov 

Website Support
E-MAIL: ctosreg@nv.doe.gov


CTOS Mailing Address
U.S. Department of Energy
CTOS - Center for Radiological/Nuclear Training 
Nevada National Security Site
P.O. Box 98521, M/S NLV 126
Las Vegas, NV 89193-8521