EDN: CIPNZC
Authors & Affiliations
Artemov V.G., Nersesian N.S.
Alexandrov Research Institute of Technoloqy, Sosnovy Bor, Russia
Nersesian N.S. – Researcher. 11/2 Krasnye Forts str., Leningrad Region, Sosnovy Bor, Russia, 188540, Тел.: +7 (813) 696-08-83; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Artemov V.G. – Head of the Laboratory, Cand. Sci. (Tech.)
Abstract
The paper presents results of simulation of experiments for evaluating the control rod worth using a neutronic model in the SAPFIR_RF&RC program package. The experiments were performed in a criticality facility with a small gas-cooled fast reactor core at FSUE “Alexandrov NITI”. Reactivity in experiments with insertion and withdrawal of rods was measured by an inverse solution of kinetics equation. A numerical analysis was performed to evaluate how a constant neutron source, positions of ex-core detectors with respect to perturbation, and parameters of delayed neutrons used in a reactivity meter would influence the reactivity measurements. The analysis results are reported. The numerical analysis was carried out using a 3D unsteady-state model with simulation of experiment conditions. The purpose of experiment simulations was to verify the simulation model and determine how the methodology of reactivity measurements by the inverse kinetic method would influence the results of control rod worth evaluation. The analysis has determined that the accuracy of experiment measurement simulations depends very much on the choice of a library (ENDF/B-V, VI, VII, ROSFOND, BNAB-78) for delayed neutron parameters. The best agreement with experiment is obtained using delayed neutron parameters from files in ROSFOND and BNAB-78 data banks. The uncertainty of measurement results depends on a constant neutron source and delayed neutron parameters as set in a reactivity meter. Since the reactor of interest is small, the spatial effects are negligible.
Keywords
gas-cooled fast reactor, core, critical assembly facility, measurement of reactivity, inverse kinetics approach, delayed neutrons parameters, spatial effects, neutron source, simulation of experiments, SAPFIR_RF&RC program package
Article Text (PDF, in Russian)
References
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UDC 621.039.51:006.91
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2022, no. 3, 3:5
