Argonne National Laboratory
Reduced Enrichment for Research and Test Reactors
Nuclear Science and Engineering Division at Argonne
U.S. Department of Energy

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Abstracts and Available Papers Presented at the
1999 International RERTR Meeting


Yu.V.Petrov, A.N.Erykalov, and M.S.Onegin
Petersburg Nuclear Physics Institute RAS
188350 Gatchina, St.Petersburg, Russia
[email protected]


The scattering and deviation of fuel element parameters by manufacturing, approximations of the reactor structure in the computer model, the partly inadequate neutron cross sections in the computer codes etc. lead to a discrepancy between the reactivity computations and data. We have compared reactivity calculations using the MCU-RFFI Monte Carlo code of critical assemblies containing WWR-M2 (36 enriched) and WWR-M5 (90%) fuel elements with benchmark experiments. The agreement was about Dr±0.3%. A strong influence of the water ratio on reac­tivity was shown and a significant heterogeneous effect was found. We have also investigated, by full scale reactor calculations for the RETR program, the contri­bution to the reactivity of the main reactor structure elements: beryllium reflector, experimental channels, irradiation devices inside the core, etc. Calculations show the importance of a more thorough study of the contributions of products of the (n,a) reaction in the Be reflector to the reactivity. Ways of improving the accuracy of the calculations are discussed.

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Yuri V. Petrov
Professor, Principal Researcher
Petersburg Nuclear Physics Institute
188350 Gatchina
St. Petersburg, Russia

Phone:   7 (812) 714-6096
Fax:        7 (812) 713-1963
E-mail:  [email protected]

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Last modified on July 29, 2008 11:33 +0200