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By Paul Greebler, Ernest J. Henley

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45 cm). The coated fuel particles are contained in the graphite matrix of the fuel compacts. A purge flow of helium gas between the sleeve and compacts is maintained by allowing a small in-leakage of helium at the top of the fuel element and some in-leakage through the pores in the graphite sleeve. This helium flow sweeps fissionproduct gases from the fuel compacts to the bottom of the fuel element and then to a fission-product trapping system. 5 ft (230 cm) in length with 24-in. F I G . 4 . D e s i g n details of the Peach B o t t o m fuel element.

5 in. The EGCR and the Windscale AGR also use cable or chain-driven control rods. The AGR control rods (50) are 4% cast boron steel rods sheathed in a stainless-steel tube having an outside diameter of 3 | in. The control rod is lifted by a chain drive and operates in a control channel having an inside diameter of 5 in. The EGCR control rod (57) contains B 4C absorber sections in a stainless-steel tube having an outside diameter of 3i in. and is operated in a channel 4 in. in diameter. The control rod is articulated to allow it to operate even in a bowed channel.

That of natural uranium and, Hence, the discharged U fuel has been included2in53the U consumption for the first three cases. Furthermore, some U is lost in the tails of the diffusion plant for reactors that use enriched uranium. This has been 53 three cases. taken into consideration in the 2last 2 53 the three reactor An examination of the U consumption for 2 53 concepts shows the increasing efficiency of U utilization in the once-through cycle with the developing reactor technology. 9 Bred fuel discharge (gm/MWe-day) «TJ235 c o n s u m p t i o n includes U lost in separative tails for enriched reactors and throwaway of U b discharge enrichment is less than natural uranium.

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