TFTR D-T SHIELDING.

TFTR (the Tokamak Fusion Test Reactor) is being prepared for the D-T experimental phase which will occur during the first 9 months of 1990. During this period, approximately 100 D-T shots will be produced, with 10**1**9 neutrons being produced per shot, necessitating additional nuclear shielding. To meet the shielding design objectives, an additional 30 in. of concrete shielding will be added around the TFTR device in the form of an igloo. Major ancillary systems, such as the neutral beams, diagnostic neutral beam, tritium pellet injector, and pump lines will require concrete enclosures around them to minimize the effect of the neutrons streaming through the ducts connecting them to the TFTR vacuum torus. This paper describes the design objectives, approach, and current status of the shielding required for the TFTR D-T program.