TY - GEN
T1 - Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite
AU - Ramić, Kemal
AU - Al-Qasir, Iyad
AU - Bostelmann, Friederike
AU - Chapman, Chris W.
AU - Campbell, Anne
AU - Grammer, Kyle
AU - Karriem, Zain
AU - Damian, Jose Ignacio Marquez
AU - Baird, Mark
AU - Wiarda, Dorothea
AU - Daemen, Luke
AU - Novak, Eric
AU - Brown, Jesse
AU - Arbanas, Goran
AU - Leal, Luiz
AU - Ilas, Germina
AU - Wieselquist, William A.
N1 - Publisher Copyright:
© 2024 AMERICAN NUCLEAR SOCIETY. All rights reserved.
PY - 2024
Y1 - 2024
N2 - This paper investigates the impact of porosity misrepresentation in ENDF/B-VIII.1 graphite thermal scattering law (TSL) evaluations on reactor criticality.Our studies involve inelastic neutron scattering (INS) measurements, transmission measurements, and nuclear criticality calculations.The INS measurements contradict the current TSL assumptions, showing no significant porosity dependence.Transmission measurements reveal discrepancies between TSL predictions and experimental data, highlighting the need for inclusion of small angle neutron scattering (SANS) cross sections.Criticality calculations for various reactor benchmarks (HTR-10, HTTR, and PROTEUS) indicate substantial overestimation in effective multiplication factor (ke f f ) for porous graphite ENDF/B-VIII.1 TSLs due to these porosity modeling inaccuracies.Our research suggests revising current neutron scattering physics to incorporate SANS modeling, to account for accurate treatment of porosity in nuclear graphite, vital for reliable designs of advanced nuclear reactor designs.
AB - This paper investigates the impact of porosity misrepresentation in ENDF/B-VIII.1 graphite thermal scattering law (TSL) evaluations on reactor criticality.Our studies involve inelastic neutron scattering (INS) measurements, transmission measurements, and nuclear criticality calculations.The INS measurements contradict the current TSL assumptions, showing no significant porosity dependence.Transmission measurements reveal discrepancies between TSL predictions and experimental data, highlighting the need for inclusion of small angle neutron scattering (SANS) cross sections.Criticality calculations for various reactor benchmarks (HTR-10, HTTR, and PROTEUS) indicate substantial overestimation in effective multiplication factor (ke f f ) for porous graphite ENDF/B-VIII.1 TSLs due to these porosity modeling inaccuracies.Our research suggests revising current neutron scattering physics to incorporate SANS modeling, to account for accurate treatment of porosity in nuclear graphite, vital for reliable designs of advanced nuclear reactor designs.
KW - criticality
KW - nuclear graphite
KW - porosity
KW - reactor benchmarks
KW - TSL
UR - http://www.scopus.com/inward/record.url?scp=85202792658&partnerID=8YFLogxK
U2 - 10.13182/PHYSOR24-43635
DO - 10.13182/PHYSOR24-43635
M3 - Conference contribution
AN - SCOPUS:85202792658
T3 - Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024
SP - 1527
EP - 1538
BT - Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024
PB - American Nuclear Society
T2 - 2024 International Conference on Physics of Reactors, PHYSOR 2024
Y2 - 21 April 2024 through 24 April 2024
ER -