TY - JOUR

T1 - Measurement of residual stresses in surrogate coated nuclear fuel particles using ring-core focussed ion beam digital image correlation

AU - Leide, Alexander J.

AU - Haynes, Thomas A.

AU - Tzelepi, Nassia

AU - Payne, John

AU - Jordan, Matthew

AU - Knol, Steven

AU - Vreeling, Jan A.

AU - Davies, Mark

AU - Goddard, David T.

AU - Pfeifenberger, Manuel J.

AU - Alfreider, Markus

AU - Kiener, Daniel

AU - Liu, Dong

N1 - Publisher Copyright: © 2023

PY - 2023/9

Y1 - 2023/9

N2 - Coated fuel particles, most commonly tri-structural isotropic (TRISO), are intended for application in several designs of advanced nuclear reactors. A complete understanding of the residual stresses and local properties of these particles through their entire lifecycle is required to inform fuel element manufacturing, reactor operation, accident scenarios, and reprocessing. However, there is very little experimental data available in the literature on the magnitude of residual stresses in the individual coating layers of these particles. This work applies ring-core focussed ion beam milling combined with digital image correlation analysis (FIB-DIC) to cross-sections of TRISO and pyrolytic carbon coatings in surrogate coated fuel particles to evaluate the residual stresses. Tensile residual hoop stresses are identified in both pyrolytic carbon layers, while silicon carbide experiences a compressive residual hoop stress. Note that these residual stresses, which were not accounted for in the models reported in open literature, have magnitudes comparable to the stresses predicted to arise in real fuel particles during service. A 2D linear-elastic continuum-based finite element analysis has been conducted to investigate the stress relaxation phenomena caused by sectioning stressed coatings on spherical particles. The FIB-DIC method established here is independent of radiation defects and can be applied to irradiated TRISO particles to retrieve first-hand information regarding the residual stress evolution during service.

AB - Coated fuel particles, most commonly tri-structural isotropic (TRISO), are intended for application in several designs of advanced nuclear reactors. A complete understanding of the residual stresses and local properties of these particles through their entire lifecycle is required to inform fuel element manufacturing, reactor operation, accident scenarios, and reprocessing. However, there is very little experimental data available in the literature on the magnitude of residual stresses in the individual coating layers of these particles. This work applies ring-core focussed ion beam milling combined with digital image correlation analysis (FIB-DIC) to cross-sections of TRISO and pyrolytic carbon coatings in surrogate coated fuel particles to evaluate the residual stresses. Tensile residual hoop stresses are identified in both pyrolytic carbon layers, while silicon carbide experiences a compressive residual hoop stress. Note that these residual stresses, which were not accounted for in the models reported in open literature, have magnitudes comparable to the stresses predicted to arise in real fuel particles during service. A 2D linear-elastic continuum-based finite element analysis has been conducted to investigate the stress relaxation phenomena caused by sectioning stressed coatings on spherical particles. The FIB-DIC method established here is independent of radiation defects and can be applied to irradiated TRISO particles to retrieve first-hand information regarding the residual stress evolution during service.

KW - FIB-DIC

KW - PyC

KW - Residual stresses

KW - SiC

KW - TRISO

UR - http://www.scopus.com/inward/record.url?scp=85164215743&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2023.101470

DO - 10.1016/j.nme.2023.101470

M3 - Article

AN - SCOPUS:85164215743

VL - 36.2023

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

SN - 2352-1791

IS - September

M1 - 101470

ER -