The safety of the International Thermonuclear Experimental Reactor will depend on the ability of the system to quickly extinguish the 1.5 GW of nominal fusion power without disruption. The local Rebut-Lallia-Watkins transport model is used to simulate such a fast-burn termination. The conditions for a passively safe operating point in steady state are discussed in terms of particle exhaust capability and tritium fuel fraction. The timescales of the process could determine the design of the poloidal field system.