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By Paul Greebler, Ernest J. Henley

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5 in. 75 in. 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 .

D e s i g n details of the Peach B o t t o m fuel element. GAS-COOLED REACTOR TECHNOLOGY 31 reflectors at each end. The design details of the Peach Bottom fuel element are illustrated in Fig. 4. 5 in. 9 cm) serves as the structure that contains the fuel compacts, graphite spine, and the internal fissionproduct trap. 76 in. 75 in. 45 cm). The center of the fuel element is an unfueled graphite spine. The fission products that diffuse out of the fuel compacts are swept by a helium purge flow inside the sleeve to the bottom reflector, where they pass over a relatively cool charcoal trap.

MELESE Fig. 3a F I G . 3. Thirty-six p i n A G R fuel assembly: (a) cutaway, (b) e n d view (courtesy o f U n i t e d K i n g d o m A t o m i c Energy Authority). the fuel element. These features are incorporated in the advanced hightemperature reactors, including the General Atomic HTGR, the Dragon HTGCR, and the AVR Pebble Bed Reactor. Although the fuel element designs for these reactors differ in major important features, they have in common at least two features: (1) Fuel particles about 100 μ in diameter are coated with pyrolytic carbon, which serves as a barrier to fission product release.

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