Reactor Core Measurements at Connecticut-Yankee and Zorita

In-core power distribution measurements are made in the Connecticut-Yankee and Zorita reactor cores by means of movable miniature fission chambers, and in-core thermocouples. The movable miniature fission chambers traverse the entire active length of selected fuel assemblies to provide a three-dimensional measure of the relative power distribution within the reactor core. In addition, chromel-alumel thermocouples are located above preselected fuel assemblies to measure the outlet temperature which is proportional to the integrated relative fuel assembly power sharing. These two in-core systems are serving as prototypes for other Westinghouse plants now under construction or on order.