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Title: VERA Core Simulator methodology for pressurized water reactor cycle depletion

Abstract

This paper describes the methodology developed and implemented in the Virtual Environment for Reactor Applications Core Simulator (VERA-CS) to perform high-fidelity, pressurized water reactor (PWR), multicycle, core physics calculations. Depletion of the core with pin-resolved power and nuclide detail is a significant advance in the state of the art for reactor analysis, providing the level of detail necessary to address the problems of the U.S. Department of Energy Nuclear Reactor Simulation Hub, the Consortium for Advanced Simulation of Light Water Reactors (CASL). VERA-CS has three main components: the neutronics solver MPACT, the thermal-hydraulic (T-H) solver COBRA-TF (CTF), and the nuclide transmutation solver ORIGEN. This paper focuses on MPACT and provides an overview of the resonance self-shielding methods, macroscopic-cross-section calculation, two-dimensional/one-dimensional (2-D/1-D) transport, nuclide depletion, T-H feedback, and other supporting methods representing a minimal set of the capabilities needed to simulate high-fidelity models of a commercial nuclear reactor. Results are presented from the simulation of a model of the first cycle of Watts Bar Unit 1. The simulation is within 16 parts per million boron (ppmB) reactivity for all state points compared to cycle measurements, with an average reactivity bias of <5 ppmB for the entire cycle. Comparisons to cycle 1more » flux map data are also provided, and the average 2-D root-mean-square (rms) error during cycle 1 is 1.07%. To demonstrate the multicycle capability, a state point at beginning of cycle (BOC) 2 was also simulated and compared to plant data. The comparison of the cycle 2 BOC state has a reactivity difference of +3 ppmB from measurement, and the 2-D rms of the comparison in the flux maps is 1.77%. Lastly, these results provide confidence in VERA-CS’s capability to perform high-fidelity calculations for practical PWR reactor problems.« less

Authors:
 [1];  [2];  [2];  [2];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [3];  [1];  [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Core Physics, Inc., Cary, NC (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Consortium for Advanced Simulation of LWRs (CASL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1344991
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Science and Engineering
Additional Journal Information:
Journal Volume: 185; Journal Issue: 1; Journal ID: ISSN 0029-5639
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 97 MATHEMATICS AND COMPUTING

Citation Formats

Kochunas, Brendan, Collins, Benjamin, Stimpson, Shane, Salko, Robert, Jabaay, Daniel, Graham, Aaron, Liu, Yuxuan, Kim, Kang Seog, Wieselquist, William, Godfrey, Andrew, Clarno, Kevin, Palmtag, Scott, Downar, Thomas, and Gehin, Jess. VERA Core Simulator methodology for pressurized water reactor cycle depletion. United States: N. p., 2017. Web. doi:10.13182/NSE16-39.
Kochunas, Brendan, Collins, Benjamin, Stimpson, Shane, Salko, Robert, Jabaay, Daniel, Graham, Aaron, Liu, Yuxuan, Kim, Kang Seog, Wieselquist, William, Godfrey, Andrew, Clarno, Kevin, Palmtag, Scott, Downar, Thomas, & Gehin, Jess. VERA Core Simulator methodology for pressurized water reactor cycle depletion. United States. doi:10.13182/NSE16-39.
Kochunas, Brendan, Collins, Benjamin, Stimpson, Shane, Salko, Robert, Jabaay, Daniel, Graham, Aaron, Liu, Yuxuan, Kim, Kang Seog, Wieselquist, William, Godfrey, Andrew, Clarno, Kevin, Palmtag, Scott, Downar, Thomas, and Gehin, Jess. Thu . "VERA Core Simulator methodology for pressurized water reactor cycle depletion". United States. doi:10.13182/NSE16-39. https://www.osti.gov/servlets/purl/1344991.
@article{osti_1344991,
title = {VERA Core Simulator methodology for pressurized water reactor cycle depletion},
author = {Kochunas, Brendan and Collins, Benjamin and Stimpson, Shane and Salko, Robert and Jabaay, Daniel and Graham, Aaron and Liu, Yuxuan and Kim, Kang Seog and Wieselquist, William and Godfrey, Andrew and Clarno, Kevin and Palmtag, Scott and Downar, Thomas and Gehin, Jess},
abstractNote = {This paper describes the methodology developed and implemented in the Virtual Environment for Reactor Applications Core Simulator (VERA-CS) to perform high-fidelity, pressurized water reactor (PWR), multicycle, core physics calculations. Depletion of the core with pin-resolved power and nuclide detail is a significant advance in the state of the art for reactor analysis, providing the level of detail necessary to address the problems of the U.S. Department of Energy Nuclear Reactor Simulation Hub, the Consortium for Advanced Simulation of Light Water Reactors (CASL). VERA-CS has three main components: the neutronics solver MPACT, the thermal-hydraulic (T-H) solver COBRA-TF (CTF), and the nuclide transmutation solver ORIGEN. This paper focuses on MPACT and provides an overview of the resonance self-shielding methods, macroscopic-cross-section calculation, two-dimensional/one-dimensional (2-D/1-D) transport, nuclide depletion, T-H feedback, and other supporting methods representing a minimal set of the capabilities needed to simulate high-fidelity models of a commercial nuclear reactor. Results are presented from the simulation of a model of the first cycle of Watts Bar Unit 1. The simulation is within 16 parts per million boron (ppmB) reactivity for all state points compared to cycle measurements, with an average reactivity bias of <5 ppmB for the entire cycle. Comparisons to cycle 1 flux map data are also provided, and the average 2-D root-mean-square (rms) error during cycle 1 is 1.07%. To demonstrate the multicycle capability, a state point at beginning of cycle (BOC) 2 was also simulated and compared to plant data. The comparison of the cycle 2 BOC state has a reactivity difference of +3 ppmB from measurement, and the 2-D rms of the comparison in the flux maps is 1.77%. Lastly, these results provide confidence in VERA-CS’s capability to perform high-fidelity calculations for practical PWR reactor problems.},
doi = {10.13182/NSE16-39},
journal = {Nuclear Science and Engineering},
issn = {0029-5639},
number = 1,
volume = 185,
place = {United States},
year = {2017},
month = {1}
}

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