Improvements in the polaris implementation of the embedded self-shielding method

Cole A. Gentry; Matthew A. Jessee; Kang Seog Kim

Improvements in the polaris implementation of the embedded self-shielding method

Cole A. Gentry, Matthew A. Jessee, Kang Seog Kim

Oak Ridge National Laboratory

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

1 Scopus citations

Abstract

Recent efforts were made to improve the run-time and accuracy of the embedded self-shielding method (ESSM) implementation in the Polaris lattice physics code. This was accomplished by allowing for separate ESSM calculations for individual material sets, performing full ESSM calculations for only a subset of material sets and energy groups, and performing an ESSM-based fast approximation for the remaining material sets and energy groups. These modifications exhibited improved control element worth calculations and decreased void fraction eigenvalue agreement variability when compared to a continuous energy KENO Monte Carlo reference. These modifications also significantly improved run-time by factors ranging from 1.8 x to 23.4x faster, depending on lattice model and full ESSM material / energy group subset size.

Original language	English
Title of host publication	International Conference on Physics of Reactors, PHYSOR 2018
Subtitle of host publication	Reactor Physics Paving the Way Towards More Efficient Systems
Publisher	Sociedad Nuclear Mexicana, A.C.
Pages	1503-1513
Number of pages	11
ISBN (Electronic)	9781713808510
State	Published - 2018
Event	2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018 - Cancun, Mexico Duration: Apr 22 2018 → Apr 26 2018

Publication series

Name	International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems
Volume	Part F168384-3

Conference

Conference	2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018
Country/Territory	Mexico
City	Cancun
Period	04/22/18 → 04/26/18

Bibliographical note

Publisher Copyright:
© 2018 International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. All rights reserved.

Funding

The work presented herein was funded by the US Nuclear Regulatory Commission (NRC) Office of Research.

Funders	Funder number
U.S. Nuclear Regulatory Commission
National Research Council

Keywords

ESSM
Lattice physics
Polaris
SCALE
Self-shielding

Cite this

Gentry, C. A., Jessee, M. A., & Kim, K. S. (2018). Improvements in the polaris implementation of the embedded self-shielding method. In International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems (pp. 1503-1513). (International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems; Vol. Part F168384-3). Sociedad Nuclear Mexicana, A.C..

Gentry, Cole A. ; Jessee, Matthew A. ; Kim, Kang Seog. / Improvements in the polaris implementation of the embedded self-shielding method. International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. Sociedad Nuclear Mexicana, A.C., 2018. pp. 1503-1513 (International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems).

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title = "Improvements in the polaris implementation of the embedded self-shielding method",

abstract = "Recent efforts were made to improve the run-time and accuracy of the embedded self-shielding method (ESSM) implementation in the Polaris lattice physics code. This was accomplished by allowing for separate ESSM calculations for individual material sets, performing full ESSM calculations for only a subset of material sets and energy groups, and performing an ESSM-based fast approximation for the remaining material sets and energy groups. These modifications exhibited improved control element worth calculations and decreased void fraction eigenvalue agreement variability when compared to a continuous energy KENO Monte Carlo reference. These modifications also significantly improved run-time by factors ranging from 1.8 x to 23.4x faster, depending on lattice model and full ESSM material / energy group subset size.",

keywords = "ESSM, Lattice physics, Polaris, SCALE, Self-shielding",

author = "Gentry, {Cole A.} and Jessee, {Matthew A.} and Kim, {Kang Seog}",

note = "Publisher Copyright: {\textcopyright} 2018 International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. All rights reserved.; 2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018 ; Conference date: 22-04-2018 Through 26-04-2018",

year = "2018",

language = "English",

series = "International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems",

publisher = "Sociedad Nuclear Mexicana, A.C.",

pages = "1503--1513",

booktitle = "International Conference on Physics of Reactors, PHYSOR 2018",

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Gentry, CA, Jessee, MA & Kim, KS 2018, Improvements in the polaris implementation of the embedded self-shielding method. in International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems, vol. Part F168384-3, Sociedad Nuclear Mexicana, A.C., pp. 1503-1513, 2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018, Cancun, Mexico, 04/22/18.

Improvements in the polaris implementation of the embedded self-shielding method. / Gentry, Cole A.; Jessee, Matthew A.; Kim, Kang Seog.
International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. Sociedad Nuclear Mexicana, A.C., 2018. p. 1503-1513 (International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems; Vol. Part F168384-3).

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

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AU - Gentry, Cole A.

AU - Jessee, Matthew A.

AU - Kim, Kang Seog

PY - 2018

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N2 - Recent efforts were made to improve the run-time and accuracy of the embedded self-shielding method (ESSM) implementation in the Polaris lattice physics code. This was accomplished by allowing for separate ESSM calculations for individual material sets, performing full ESSM calculations for only a subset of material sets and energy groups, and performing an ESSM-based fast approximation for the remaining material sets and energy groups. These modifications exhibited improved control element worth calculations and decreased void fraction eigenvalue agreement variability when compared to a continuous energy KENO Monte Carlo reference. These modifications also significantly improved run-time by factors ranging from 1.8 x to 23.4x faster, depending on lattice model and full ESSM material / energy group subset size.

AB - Recent efforts were made to improve the run-time and accuracy of the embedded self-shielding method (ESSM) implementation in the Polaris lattice physics code. This was accomplished by allowing for separate ESSM calculations for individual material sets, performing full ESSM calculations for only a subset of material sets and energy groups, and performing an ESSM-based fast approximation for the remaining material sets and energy groups. These modifications exhibited improved control element worth calculations and decreased void fraction eigenvalue agreement variability when compared to a continuous energy KENO Monte Carlo reference. These modifications also significantly improved run-time by factors ranging from 1.8 x to 23.4x faster, depending on lattice model and full ESSM material / energy group subset size.

KW - ESSM

KW - Lattice physics

KW - Polaris

KW - SCALE

KW - Self-shielding

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M3 - Conference contribution

AN - SCOPUS:85106177679

T3 - International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems

SP - 1503

EP - 1513

BT - International Conference on Physics of Reactors, PHYSOR 2018

PB - Sociedad Nuclear Mexicana, A.C.

T2 - 2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018

Y2 - 22 April 2018 through 26 April 2018

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Gentry CA, Jessee MA , Kim KS. Improvements in the polaris implementation of the embedded self-shielding method. In International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. Sociedad Nuclear Mexicana, A.C. 2018. p. 1503-1513. (International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems).

Improvements in the polaris implementation of the embedded self-shielding method

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