CRITICAL ASSEMBLIES OF FISSIONABLE MATERIALS
Citations Over Time
Abstract
validity of the method is presented. The derivation of ANL Set 635 is described. It is shown that Set 635 is a modification of the Yiftah, Okrent, and Moldauer ANL Set 135 and that the central spectra and fission ratios calculated with the two sets are generally similar. The U/sup 234/and U/sup 236/ fission cross sections are not given in Sets 135 and 835; these were taken from ANL Set 179. The measured and calculated fission ratios obtained with U/sup 233/, U/sup 234/, U/sup 235/, U/sup 236/, Pu/sup 239/ , and Pu/sup 240/ were compared, both to search for trends which might occur with progressive changes in spectra, and also to determine the accuracy of prediction of ratios. It was found that the calculated relative fission rates of Pu/sup 239/ and U/sup 233/ are within about plus or minus 11/2% of the measured values, and the calculated rates for Pu/sup 240/, U/sup 236/, and U/sup 238/ relative to either Pu/sup 239/ or U/sup 233/ are within plus or minus 31/2 to plus or minus 5% of the measured values. However, calculated fission rates for U/sup 235/ and U/sup 234/ are about 6% low and 8% high, respectively, relative to those of the other five isotopes. (auth)
Related Papers
- Review of cross section data important to the uranium--plutonium fuel cycle in thermal reactors(1978)
- → Predictions of the Energy Dependence of the Average Yield of Neutrons Per Fission of Isotopes of Thorium, Uranium, and Plutonium(1971)10 cited
- → Fission cross sections of some thorium, uranium, neptunium and plutonium isotopes relative to /sup 235/U(1983)5 cited
- → The fission cross section ratios and error analysis for ten thorium, uranium, neptunium and plutonium isotopes at 14. 74 MeV neutron energy(1987)2 cited