By John Graham (Eds.)

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It is now necessary to understand how this power produces tem­ perature changes that might effect the reactivity through temperature coeffi­ cients. This understanding can come from attempting to model the system in mathematical terms. 18) 2 where Η is the heat production term. This, like Eq. space dependent. 3), is also time and Fig. 6. Schematic representation of the thermal distribution through a cross section of a cylindrical fuel pin. Considering a cylindrical fuel pin in which heat is produced (Fig.

7-hr iodine decay time. However it does see an immediate reduction in removal by neutron capture; thus the xenon concentration grows. This increase in xenon concentration complicates the subsequent start-up of some small thermal reactors due to the poison increase. Further, xenon poisoning could produce spatial instabilities in the very large thermal systems, as some regions of the core could see poison changes on different time scales from others. This effect is corrected by regional control systems.

Further, xenon poisoning could produce spatial instabilities in the very large thermal systems, as some regions of the core could see poison changes on different time scales from others. This effect is corrected by regional control systems. 4) and the fast cores are too small for spatial instabili­ ties. However, see the thorium cycle reactivity change in the next section, as it is a similar though opposite effect. 6. 4 Dimensional Changes In fast reactors which have very small cores, the bowing or buckling of fuel elements due to temperature changes may shift fuel in or out of more reactive regions with consequent increases or decreases in reactivity.

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