Walkaway Safe. ThorCon fuel is in liquid form. If the reactor overheats for whatever reason, ThorCon will shut itself down, and passively handle the decay heat. No power, no machinery, no operator action is required. This is built into the reactor physics. The operators can do nothing to prevent safe shutdown and cooling. ThorCon has at least three gas tight barriers between the fuelsalt and the atmosphere. The reactor operates at garden hose pressure. In the event of a primary loop rupture, there is no dispersal energy and no phase change. The spilled fuel merely flows to a drain tank where it is passively cooled. The most troublesome fission products, including Sr-90 and Cs-137, are chemically bound to the salt. They will end up in the drain tank as well. Visit Safety.