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Most thermionic reactors are designed to allow the fission gases to escape out of the emitter. There exist several design variations to allow the gas to escape from the reactor core. The final disposition of the gas has several interesting problems. If the gas is put into a chamber, its volume is too large to be contained in the shield. Fortunately the fission gas do not pose a radiation problem at lOO ft. Because of the long half-life the fission gases could prevent any close approach to the reactor after it has been shut down. The fission gases could instead be stored in an absorption trap. An absorption trap is usually assumed to require very low temperatures, however, experimental data indicate that reservoirs at several hundred degrees C can be useful. Another scheme is to simply allow the fission gases to escape. Again, because of the low activity of the fission products, this method should pose no radiation hazards.

VENTING OF FISSION PRODUCTS AND SHIELDING IN THERMIONIC NUCLEAR REACTOR SYSTEMS.