Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite

Kemal Ramić; Iyad Al-Qasir; Friederike Bostelmann; Chris W. Chapman; Anne Campbell; Kyle Grammer; Zain Karriem; Jose Ignacio Marquez Damian; Mark Baird; Dorothea Wiarda; Luke Daemen; Eric Novak; Jesse Brown; Goran Arbanas; Luiz Leal; Germina Ilas; William A. Wieselquist

doi:10.13182/PHYSOR24-43635

Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

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 (k_e 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.

Original language	English
Title of host publication	Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024
Publisher	American Nuclear Society
Pages	1527-1538
Number of pages	12
ISBN (Electronic)	9780894487972
DOIs	https://doi.org/10.13182/PHYSOR24-43635
State	Published - 2024
Event	2024 International Conference on Physics of Reactors, PHYSOR 2024 - San Francisco, United States Duration: Apr 21 2024 → Apr 24 2024

Publication series

Name	Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024

Conference

Conference	2024 International Conference on Physics of Reactors, PHYSOR 2024
Country/Territory	United States
City	San Francisco
Period	04/21/24 → 04/24/24

Funding

This work was supported by the Nuclear Criticality Safety Program, funded and managed by the National Nuclear Security Administration, United States for the Department of Energy.This work was supported by the US Nuclear Regulatory Commission (NRC).This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.This research used resources of the National Energy Research Scientific Computing Center, a DOE SC user facility operated under Contract No.DE-AC02-05CH11231.

Keywords

TSL
criticality
nuclear graphite
porosity
reactor benchmarks

Access to Document

10.13182/PHYSOR24-43635

Cite this

Ramić, K., Al-Qasir, I., Bostelmann, F., Chapman, C. W., Campbell, A., Grammer, K., Karriem, Z., Damian, J. I. M., Baird, M., Wiarda, D., Daemen, L., Novak, E., Brown, J., Arbanas, G., Leal, L., Ilas, G., & Wieselquist, W. A. (2024). Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite. In Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024 (pp. 1527-1538). (Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024). American Nuclear Society. https://doi.org/10.13182/PHYSOR24-43635

Ramić, Kemal ; Al-Qasir, Iyad ; Bostelmann, Friederike et al. / Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite. Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024. American Nuclear Society, 2024. pp. 1527-1538 (Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024).

@inproceedings{23aaa8c875eb4b049be813daa47d0835,

title = "Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite",

abstract = "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.",

keywords = "TSL, criticality, nuclear graphite, porosity, reactor benchmarks",

author = "Kemal Rami{\'c} and Iyad Al-Qasir and Friederike Bostelmann and Chapman, \{Chris W.\} and Anne Campbell and Kyle Grammer and Zain Karriem and Damian, \{Jose Ignacio Marquez\} and Mark Baird and Dorothea Wiarda and Luke Daemen and Eric Novak and Jesse Brown and Goran Arbanas and Luiz Leal and Germina Ilas and Wieselquist, \{William A.\}",

note = "Publisher Copyright: {\textcopyright} 2024 AMERICAN NUCLEAR SOCIETY. All rights reserved.; 2024 International Conference on Physics of Reactors, PHYSOR 2024 ; Conference date: 21-04-2024 Through 24-04-2024",

year = "2024",

doi = "10.13182/PHYSOR24-43635",

language = "English",

series = "Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024",

publisher = "American Nuclear Society",

pages = "1527--1538",

booktitle = "Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024",

}

Ramić, K , Al-Qasir, I , Bostelmann, F , Chapman, CW , Campbell, A , Grammer, K , Karriem, Z, Damian, JIM, Baird, M , Wiarda, D, Daemen, L, Novak, E, Brown, J , Arbanas, G , Leal, L , Ilas, G & Wieselquist, WA 2024, Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite. in Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024. Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024, American Nuclear Society, pp. 1527-1538, 2024 International Conference on Physics of Reactors, PHYSOR 2024, San Francisco, United States, 04/21/24. https://doi.org/10.13182/PHYSOR24-43635

Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite. / Ramić, Kemal ; Al-Qasir, Iyad ; Bostelmann, Friederike et al.
Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024. American Nuclear Society, 2024. p. 1527-1538 (Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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.

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 - TSL

KW - criticality

KW - nuclear graphite

KW - porosity

KW - reactor benchmarks

UR - https://www.scopus.com/pages/publications/85202792658

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 -

Ramić K , Al-Qasir I , Bostelmann F , Chapman CW , Campbell A , Grammer K et al. Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite. In Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024. American Nuclear Society. 2024. p. 1527-1538. (Proceedings of the International Conference on Physics of Reactors, PHYSOR 2024). doi: 10.13182/PHYSOR24-43635

Assessing criticality implications of small angle neutron scattering and porosity misrepresentation in ENDF/B-VIII.1 TSLs for nuclear graphite

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Keywords

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