Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity
For the resonance treatment of a very high temperature reactors (VHTR) fuel with the double heterogeneity, an extension of the pin-based pointwise energy slowing-down method (PSM) was developed and implemented into DeCART. The proposed method, PSM-double heterogeneity (DH), has an improved spherical...
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Online Access: | https://www.mdpi.com/1996-1073/14/8/2179 |
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doaj-0e68faae17f34815bd77ed9ce8ca4cc32021-04-14T23:01:27ZengMDPI AGEnergies1996-10732021-04-01142179217910.3390/en14082179Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double HeterogeneityTae Young Han0Jin Young Cho1Chang Keun Jo2Hyun Chul Lee3Korea Atomic Energy Research Institute, 111 Daedeok-daero, 989 beon-gil, Yuseong-gu, Daejeon 34057, KoreaKorea Atomic Energy Research Institute, 111 Daedeok-daero, 989 beon-gil, Yuseong-gu, Daejeon 34057, KoreaKorea Atomic Energy Research Institute, 111 Daedeok-daero, 989 beon-gil, Yuseong-gu, Daejeon 34057, KoreaNuclear System Division, School of Mechanical Engineering, Pusan National University, 2 Busandaehak-ro, 63 beon-gil, Geumjeong-gu, Busan 46241, KoreaFor the resonance treatment of a very high temperature reactors (VHTR) fuel with the double heterogeneity, an extension of the pin-based pointwise energy slowing-down method (PSM) was developed and implemented into DeCART. The proposed method, PSM-double heterogeneity (DH), has an improved spherical unit cell model with an explicit tri-structural isotropic (TRISO) model, a matrix layer, and a moderator for reflecting the moderation effect. The moderator volume was analytically derived using the relation of the Dancoff factor and the mean chord length. In the first step, the pointwise homogenized cross-sections for the compact was obtained after solving the slowing down equation for the spherical unit cell. Then, the shielded cross-section for the homogenized fuel compact was generated using the original PSM. The verification calculations were performed for the fuel pins with various packing fractions, compact sizes, TRISO sizes, and fuel temperatures. Additionally, two fuel block problems with very different sizes were examined and the depletion calculation was carried out for investigating the accuracy of the proposed method. They revealed that the PSM-DH has a good performance in the VHTR problems.https://www.mdpi.com/1996-1073/14/8/2179PSMdouble heterogeneityresonance treatmentVHTR |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tae Young Han Jin Young Cho Chang Keun Jo Hyun Chul Lee |
spellingShingle |
Tae Young Han Jin Young Cho Chang Keun Jo Hyun Chul Lee Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity Energies PSM double heterogeneity resonance treatment VHTR |
author_facet |
Tae Young Han Jin Young Cho Chang Keun Jo Hyun Chul Lee |
author_sort |
Tae Young Han |
title |
Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity |
title_short |
Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity |
title_full |
Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity |
title_fullStr |
Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity |
title_full_unstemmed |
Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity |
title_sort |
extension of pin-based point-wise energy slowing-down method for vhtr fuel with double heterogeneity |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2021-04-01 |
description |
For the resonance treatment of a very high temperature reactors (VHTR) fuel with the double heterogeneity, an extension of the pin-based pointwise energy slowing-down method (PSM) was developed and implemented into DeCART. The proposed method, PSM-double heterogeneity (DH), has an improved spherical unit cell model with an explicit tri-structural isotropic (TRISO) model, a matrix layer, and a moderator for reflecting the moderation effect. The moderator volume was analytically derived using the relation of the Dancoff factor and the mean chord length. In the first step, the pointwise homogenized cross-sections for the compact was obtained after solving the slowing down equation for the spherical unit cell. Then, the shielded cross-section for the homogenized fuel compact was generated using the original PSM. The verification calculations were performed for the fuel pins with various packing fractions, compact sizes, TRISO sizes, and fuel temperatures. Additionally, two fuel block problems with very different sizes were examined and the depletion calculation was carried out for investigating the accuracy of the proposed method. They revealed that the PSM-DH has a good performance in the VHTR problems. |
topic |
PSM double heterogeneity resonance treatment VHTR |
url |
https://www.mdpi.com/1996-1073/14/8/2179 |
work_keys_str_mv |
AT taeyounghan extensionofpinbasedpointwiseenergyslowingdownmethodforvhtrfuelwithdoubleheterogeneity AT jinyoungcho extensionofpinbasedpointwiseenergyslowingdownmethodforvhtrfuelwithdoubleheterogeneity AT changkeunjo extensionofpinbasedpointwiseenergyslowingdownmethodforvhtrfuelwithdoubleheterogeneity AT hyunchullee extensionofpinbasedpointwiseenergyslowingdownmethodforvhtrfuelwithdoubleheterogeneity |
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