Tritium-Metal Interaction in Various First Wall Materials

A COMPARISON OF THE BEHAVIOUR OF TRITIUM IN VARIOUS FIRST WALL MATERIALS AND IN A NET-III GEOMETRY IS PRESENTED IN THIS WORK. A COMPUTER PROGRAM BASED ON THE FORMALISM OF THE PIDAT-CODE AND INCLUDING A TEMPERATURE GRADIENT IN THE WALL AND THE SORET-EFFECT HAS BEEN USED FOR THE CALCULATION OF THE TRITIUM PROPERTIES IN THE FIRST WALL. THE CALCULATED PROPERTIES ARE THE TRITIUM INVENTORY IN THE WALL, THE PERMEATION OF TRITIUM THROUGH THE WALL INTO THE COOLANT, THE RECYCLING OF TRITIUM DURING OPERATION AND THE OUT-GASSING OF TRITIUM DURING DWELL-TIME OR AFTER SHUTDOWN. THE DEVELOPMENT OF THESE PROPERTIES IN TIME FOR DIFFERENT SCENARIOS (WITH AND WITHOUT TRAPS, AT DIFFERENT TEMPERATURE GRADIENTS IN THE WALL, AT DIFFERENT SURFACE CLEANLINESS) ARE PRESENTED. THE STEADY-STATE TRITIUM INVENTORY AND PERMEATION IN THE FIRST WALL AND THE TIME TO REACH 90% OF THE STEADY-STATE ARE REPORTED. THE VARIOUS FIRST WALL MATERIALS INVESTIGATED IN THIS REPORT ARE STAINLESS STEEL AISI 316L, AISI 316L COATED WITH ALPHA-SIC OF 1 MM THICKNESS, AISI 316L PROTECTED WITH GRAPHITE TILES OF 1 CM THICKNESS, MOLYBDENUM, ALUMINIUM, VANADIUM. THE PARTICULARIETIES OF THE TRITIUM BEHAVIOUR IN THESE MATERIALS ARE DISCUSSED.

REITER Friedrich;  GERVASINI Gabriele; 

1995-03-15

JRC5345