The safety case for JET D-T operation

Formal approval was required to permit tritium operation of the JET machine to proceed and a safety case was prepared in order to justify this. The st andards and the methodology used are summarised both for the Active Gas Han dling System and for the torus systems. The main design safety principles a re described and accident sequences are reviewed. Both deterministic and pr obabilistic analysis was carried out and the main results in terms of sourc e terms, on-site and off-site doses are presented. It is shown that operati on of JET with deuterium-tritium plasmas complies with the ALARP principle, (C) 1999 JET Joint Undertaking. Published by Elsevier Science S.A. All rig hts reserved.