Download Advances in nuclear science and technology. / Volume 4 by Paul Greebler, Ernest J. Henley PDF

By Paul Greebler, Ernest J. Henley

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Fuel element development for gas-cooled reactors is illustrated by reviewing the fuel element technology of the magnox reactor, the AGR, the HTGR, and other types of gas-cooled reactors being constructed or developed. A. M a g n o x - C l a d Uranium Metal Fuel Elements The first type of fuel elements developed for gas-cooled power reactors were the magnox fuel elements developed for the British Calder Hall reactor. The magnox fuel elements contain uranium metal and are clad with a magnesium alloy having fins on the cladding to improve the thermal performance of the elements.

L. RICKARD, AND G. B. MELESE primary codant system of these products. Such a system has been developed for use in the Dungeness Β plant. Although helium cooling removes the problem of moderator corrosion, the level of impurities in the helium must be controlled. Also, some fission product release is to be expected in the high-temperature reactors using all-ceramic fuel elements so that a clean-up system is required to control the level of both of these types of impurity. In both the Dragon reactor experiment and the Peach Bottom reactor, the helium purge flow through the fuel elements is removed to an external fission product trapping system and helium purification system.

This is the case, for example, in the circulator for the 40-MWe HTGR Peach Bottom plant in which the circulators are of the single-stage centrifugal type driven by 2000-hp motors with hydraulic coupling for speed control. In the case of C0 2-cooled reactors, both electric motor and steam turbine driven circulators have been employed, with 1500 rpm being used for centrifugal machines and twice this for axial flow machines. As the unit size of the reactors has increased, the unit power of the circulators has also increased up to about 17,000 hp for the latest AGR power station (Dungeness B).

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