A simplified perturbation model for calculation of few-group cross sections and reaction rates

Journal Article · Sat Oct 01 04:00:00 EDT 1983 · Nucl. Sci. Eng.; (United States)

OSTI ID:6280303

Sinclair, A N; Lee, J C

A fast efficient perturbation model is developed for generating four-group cross sections and flux spectrum and performing fuel depletion in a light water reactor unit cell configuration. In the thermal energy region, an approximate solution of the neutron spectrum is determined based on the Wigner-Wilkins free-gas hydrogen scattering model. In the fast energy region, a combination of analytical and empirical techniques is used to determine resonance cross sections. These models are combined in a perturbation scheme and incorporated as the SIFAS code. Reaction rates of important nuclides in reactor cores can be estimated by the code to within 0.5% for fuel depletion studies with fuel burnup of up to 30,000 MWd/tonne.

• Research Organization: The University of Michigan, Department of Nuclear Engineering Ann Arbor, Michigan
• OSTI ID: 6280303
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 85:2; ISSN NSENA
• Country of Publication: United States
• Language: English

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