A Mathematical Model of Radiation-Induced Shape Change in Fuel Subassemblies of the BN-Type Reactor Core and Its Implementation in the ANSYS Software Package
- Authors: Ryabtsov A.V.1, Vilensky O.Y.1
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Affiliations:
- AO OKBM Afrikantov
- Issue: Vol 10, No 6 (2019)
- Pages: 1504-1509
- Section: Simulation of Materials and Technological Processes
- URL: https://journals.rcsi.science/2075-1133/article/view/208149
- DOI: https://doi.org/10.1134/S2075113319060200
- ID: 208149
Cite item
Abstract
One of the main operability criteria for fuel subassemblies (FSAs) in sodium-cooled fast reactor cores, i.e., the criterion of tolerable shape change in the hexagonal wrapper tube, is formulated. The equations that enable one to investigate the kinetics of the stress-strain state of a three-dimensional body have been adapted to operating conditions of the FSAs. A mathematical model of radiation-induced shape change in ferritic-martensitic EP-450 grade steel is proposed. With regard to the proposed model and data on the radiation-induced shape change in other currently used and prospective BN reactor core structural materials, blocks for recording radiation-induced swelling and radiation-induced creep were developed for the ANSYS software package, which made it possible to utilize its potential in this area. The test case with the proposed models of the radiation-induced swelling and creep demonstrates that the developed blocks describe sufficiently well the radiation-induced shape change in the examined structural materials exposed to radiation. Calculation of the radiation-induced shape change in the FSA hexagonal wrapper tube has been performed at various radiation-induced swelling rates and radiation-induced creep moduli. The calculated results and the results of post-irradiation inspection of the FSA dimensions are compared. Recommendations for use of the proposed models designed to calculate and estimate the radiation-induced shape change and define the stress-strain state of the FSAs are made.
About the authors
A. V. Ryabtsov
AO OKBM Afrikantov
Author for correspondence.
Email: sigma@okbm.nnov.ru
Russian Federation, Nizhny Novgorod, 603074
O. Yu. Vilensky
AO OKBM Afrikantov
Email: sigma@okbm.nnov.ru
Russian Federation, Nizhny Novgorod, 603074