Triple Bar - Existing Sites

3 steps to unescorted worker access    

The Triple Bar Existing Sites (TBES) is a ‘three bar’ training course delivered online or via classroom which has been designed with industry involvement for you to complete before you start work on a nuclear licensed site.

The TBES introduces you to the requirements for compliance, nuclear awareness and industry behaviours for safe working in the nuclear industry.  The TBES plays a fundamental part in making everyone in the nuclear industry aware of the impact that their actions have and role they have to help ensure we have, maintain and grow a UK nuclear industry for safe and continued operations.

   Working in the Nuclear Industry (BNI)        

In the first bar you will be providing with a basic knowledge of the nuclear industry and what is important to know if you are working in it.

  Going on Site (BNO)      

In the second bar you will learn about some of the special arrangements you need to be aware of when you are working on a nuclear site such as strict security measures, emergency procedures and delivering the quality expected on a nuclear licensed site.

  Safety on a Nuclear Site (BNS)      

In the final bar you will find out how you need to put safety into practice when you are working on a nuclear licensed site, including:

  • Behaving safely and recognising safe and unsafe conditions.
  • Knowing the traits of a healthy safety culture and understanding common types of errors people make and the tools we use to avoid them.

On completion of all three bars you will need to complete the end of course assessment.  This has a pass mark of 80% and you can have up to three attempts to achieve a pass score.  Upon successful completion you will receive one Certificate of Achievement that can be recorded on the NS4P and for you to use as evidence for site induction requirements.  Sites may test your knowledge upon arrival at a site depending on the length of time from your completion of these courses to ensure knowledge retention.

Please note: If you are about to start work on a Nuclear New Build Site, there is a different eLearning programme to complete - click here for more details

       Book a course        

On Line: NSAN offers the course via its On-line Learning Platform the Nuclear Training Network

Cost: The course is £100 +VAT .  Employees of member companies recieve 50% discount.

To receive the 50% discount you will need to ask your HR / Training Department to request a special purchase discount code prior to purchase of single or multiple e-Learner places.  Please note that discounts cannot be applied retrospectively.

To request the discount code click here

If you are a member company looking for 50+ places on the e-learning TBES click here for more information on a further discount.


The TBES is also available as tutor led classroom training through members of the NSAN High Quality Training Provider Network.  The classroom option requires 1 day to complete.  For more information on the providers search for Triple Bar Existing Sites on our Course Search facility