ITER PHYSICS-SAFETY INTERFACE - MODELS AND ASSESSMENTS

Plasma operation conditions and physics requirements to be used as a b asis for safety analysis studies are developed and physics results mot ivated by safety considerations are presented for the ITER design. Phy sics guidelines and specifications for enveloping plasma dynamic event s for Category I (operational event), Category II (likely event), and Category III (unlikely event) are characterized. Safety related physic s areas that are considered are: (i) the effect of plasma on machine a nd safety (runaway electrons) and (ii) plasma response to ex-vessel LO CA from the first wall, providing a potential passive plasma shutdown due to Be evaporation. Physics models and expressions developed are im plemented in a safety analysis code (SAFALY, couples 0-D dynamic plasm a model to thermal response of the in-vessel components). Results from SAFALY are presented.