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By Paul Greebler, Ernest J. Henley

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The cable-driven rods depend on gravity for shutdown insertion, and, therefore, the clearance between the control rod GAS-COOLED REACTOR TECHNOLOGY 45 channel and the rod is normally quite large. Typically, the control rod diameter is about 2 in. 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.

Circuit driers are used in the magnox reactors (52) to keep the moisture level at about 2 ppm. 5 vol-% in about 100 days, 85 to 95 % of the residual gas being carbon monoxide. Particulate matter is removed in a bypass system having cyclone filters. The radiolytic reaction, C 0 2 + C -> 2 CO, becomes a problem as the coolant temperature is increased in the C0 2-cooled reactor. It has been shown in the Windscale AGR (22) that this reaction can be adequately inhibited by the addition of methane to the coolant.

3 mill/kW-hr lower than that of the lightwater reactor plant in the low ore cost ranges. This is consistent with the generally recognized fact that the plant costs of the earlier gas-cooled reactors tend to be higher than those of water reactors, but the fuel cycle costs are lower. Although the fuel cycle cost for the AGR is not significantly lower than that of the magnox reactors, at least for low ore costs, the plant cost of the AGR is considerably lower, so that the power cost is lower. 2 53Fig.

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