Home / Store / Journals / Electronic Articles / Nuclear Science and Engineering / Volume 80 / Number 2 / Pages 338-341
Louis B. Freeman, Herbert C. Hecker
Nuclear Science and Engineering / Volume 80 / Number 2 / Pages 338-341
Format:electronic copy (download)
In a thorium-fueled reactor, the conversion of 232Th to 233U involves the intermediate nuclide 233Pa. This isotope has a significant reactivity effect in any thorium reactor, especially one with an important epithermal flux component. The light water breeder reactor, operating in the Shippingport atomic power station, is a 233U-Th reactor with about half the power produced at energies above thermal. The reactivity effect of full-power equilibrium 233Pa has been inferred from critical position measurements and control element reactivity worths to be ∼2.5% Δρ in this reactor, confirming calculational predictions.
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