The pseudo-resonant-nuclide subgroup method based global–local self-shielding calculation scheme

Liu, Zhouyu; He, Qingming; Zu, Tiejun; Cao, Liangzhi; Wu, Hongchun; Zhang, Qian

doi:10.1080/00223131.2017.1394232

Cited by 48 publications

(6 citation statements)

References 15 publications

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“…In the pseudo-resonant-nuclide subgroup method [8][9], the pseudo resonant nuclide is defined by mixing all the resonant nuclides in the fuel region according to the number densities.…”

Section: Hyper-fine Energy Group Cross Sections Homogenization Based mentioning

confidence: 99%

Methods for Calculation of Self-Shielded Cross Sections of Fully Ceramic Micro-Encapsulated Fuel Double Heterogeneous System

Wen

Liu

et al. 2021

EPJ Web Conf.

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Fully ceramic micro-encapsulated (FCM) fuel is a kind of fuel that employs tri-structural isotropic (TRISO) particles to enhance safety. The FCM fuel assembly is a double heterogeneous system. The conventional self-shielding calculation methods cannot treat the DH effect. In this paper, three methods based on equivalent homogenization of the TRISO particle and the matrix are studied and compared: the hyper-fine energy group cross sections (XSs) homogenization based hyper-fine energy group method (HHM), the hyper-fine energy group XSs homogenization based subgroup method (HSM) and the subgroup XSs homogenization based subgroup method (SSM). These methods are implemented in a high-fidelity neutronics code NECP-X. Numerical results show that these methods are able to treat the double heterogeneity of the FCM fuel. The precision of the HHM and HSM is higher than that of the SSM.

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“…In the pseudo-resonant-nuclide subgroup method [8][9], the pseudo resonant nuclide is defined by mixing all the resonant nuclides in the fuel region according to the number densities.…”

Section: Hyper-fine Energy Group Cross Sections Homogenization Based mentioning

confidence: 99%

Methods for Calculation of Self-Shielded Cross Sections of Fully Ceramic Micro-Encapsulated Fuel Double Heterogeneous System

Wen

Liu

et al. 2021

EPJ Web Conf.

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“…The equivalent Dancoff-factor cell (EDC) method was newly proposed by Liu et al (2018). It adopted the concept of separating the shadowing effects of neighboring fuel rods from the spatial self-shielding inside the fuel rod.…”

Section: Remedying the Cpu Time Issue By The Equivalent Dancoff-facto...mentioning

confidence: 99%

“…The equivalent Dancoff-factor cell (EDC) method was originally proposed by Liu et al (2018), where it was named global-local self-shielding calculation scheme and was applied to the pseudo-resonant-nuclide subgroup method based on the physical probability tables. The name "equivalent Dancoff-factor cell model" was employed in the study of Yamaji et al (2018), where the method was applied to ultra-fine-group resonance treatment.…”

Section: Introductionmentioning

confidence: 99%

A subgroup method based on the equivalent Dancoff-factor cell technique in APOLLO3® for thermal reactor calculations

Mao

Zmijarevic

Sanchez

2020

Annals of Nuclear Energy

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“…High fidelity neutronics calculation requires accurate MG effective self-shielded XSs obtained from resonance calculation. Global-local self-shielding calculation scheme [1,2,3] and a method coupling Embedded Self-Shielding Method (ESSM) and hyperfine group method [4] have been proposed by the author's group to achieve highly resolved self-shielding calculations and implemented in the high fidelity neutronics calculation code NECP-X. Verification results clarified high accuracy on the uranium oxide fuel problem for both methods.…”

Section: Introductionmentioning

confidence: 99%

Processing Resonance Self-Shielding Effect of Gadolinia Based on Imptoved Supercell Scheme

Wen

et al. 2021

EPJ Web Conf.

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An improved supercell scheme has been proposed in this paper to efficiently and accurately process resonance self-shielding effect of gadolinia. Resonance effects are classified into global shadowing effect and local effects involving resonance interference, spatial self-shielding effects. Two categories of effects are decoupled and treated respectively based on different 1-D cylindrical pins. Hyperfine group method is applied to obtain multi-group cross sections for each 1-D pin. Afterwards, two categories of effects are coupled based on a correction formula. Because of the low efficiency for Carlvik method to compute collision probabilities in hyperfine group method, online tabulation and interpolation method is developed to accelerate gaining collision probabilities. The proposed scheme is verified against the problems of 3×3 pins with gadolinia rod, VERA 2O assembly with 12 gadolinia rods and VERA 2P with 24 gadolinia rods. The numerical results suggest promising consistence of multi-group cross sections and eigenvalues between the proposed scheme and reference solutions.

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The pseudo-resonant-nuclide subgroup method based global–local self-shielding calculation scheme

Cited by 48 publications

References 15 publications

Methods for Calculation of Self-Shielded Cross Sections of Fully Ceramic Micro-Encapsulated Fuel Double Heterogeneous System

Methods for Calculation of Self-Shielded Cross Sections of Fully Ceramic Micro-Encapsulated Fuel Double Heterogeneous System

A subgroup method based on the equivalent Dancoff-factor cell technique in APOLLO3® for thermal reactor calculations

Processing Resonance Self-Shielding Effect of Gadolinia Based on Imptoved Supercell Scheme

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