Accurate resonance calculation method coupling simplified embedded self-shielding method and ultra-fine group method

Zu, Tiejun; Li, Jikui; Wen, Yangdong; Cao, Liangzhi

doi:10.1016/j.anucene.2018.05.040

Cited by 10 publications

(2 citation statements)

References 12 publications

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“…Yamaji et al, 2018 used the ENCM to calculate the Dancoff factor for each fuel pin and also built the equivalent 1-D cylindrical model in which the effective cross section was calculated with the ultra-fine-group method. Zu et al, 2018 prepared a table of the escape cross section and the pin pitch, and used the one-group ESSM to calculate the escape cross section for each fuel pin and built the equivalent 1-D cylindrical model by interpolating the table. The effective cross section was calculated by the ultra-fine-group method in the equivalent 1-D cylindrical model.…”

Section: Introductionmentioning

confidence: 99%

Pin-resolved ultra-fine-group with correction method and its application to plate-type fuel reactor analysis

Rao

Peng

et al. 2023

Front. Energy Res.

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In order to perform the resonance calculation efficiently and accurately, several pin-resolved ultra-fine-group methods combining the ultra-fine-group method and Dancoff factor have been developed recently. The ultra-fine-group method is used to consider the self-shielding effect accurately in the 1-D fuel model, and the Dancoff factor is used to consider the shadowing effect in a lattice system. The pin-resolved ultra-fine-group with correction method, combining the ultra-fine-group method and Dancoff factor, is implemented in a transport code using the method of characteristic. In order to expand the application range, the pin-resolved method is extended for the plate-type fuel. Numerical results show good accuracy for the plate-type fuel reactor analysis.

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Section: Introductionmentioning

confidence: 99%

Pin-resolved ultra-fine-group with correction method and its application to plate-type fuel reactor analysis

Rao

Peng

et al. 2023

Front. Energy Res.

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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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Subgroup method

Cao

Wu²,

Zhang³

et al. 2023

Resonance Self-Shielding Calculation Methods in Nuclear Reactors

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Accurate resonance calculation method coupling simplified embedded self-shielding method and ultra-fine group method

Cited by 10 publications

References 12 publications

Pin-resolved ultra-fine-group with correction method and its application to plate-type fuel reactor analysis

Pin-resolved ultra-fine-group with correction method and its application to plate-type fuel reactor analysis

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

Subgroup method

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