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Study of self-shielding in dpa calculations

Abstract : Self-shielding due to the resonance of cross sections influences the neutron spectrum. Mature treatment of the self-shielding has been developed in deterministic neutron transport codes. However, the correction of both neutron flux and cross sections cannot ensure the accuracy of calculated Displacement per Atom (DPA), which depends not only on cross sections, but also the corresponding recoil energies of the Primary Knocked-on Atom (PKA). The present study focuses on 56Fe because it is the most abundant isotope in the stainless steel, which is the material for the reactor pressure vessel in light water reactors and that of the fuel cladding in fast reactors. Due to the temperature dependence of cross sections, the temperature effect is firstly analyzed. Results show that the Doppler effect has small influence on DPA calculation for 56Fe. 33-group and 1968-group DPA cross sections are then used to investigate the influence of the self-shielding on the DPA calculation. The effect of the self-shielding on DPA rate calculation is examined in the fuel cladding in the ASTRID inner core. The contribution of the elastic scattering, inelastic scattering, and disappearance reactions to total DPA are 82.7percent, 17.1percent, and 0.1percent, respectively. Relative and respective reductions are 11.3percent, 5.9percent, and 20.5percent by taking the self-shielding into account. The calculation of DPA is not summable after self-shielding correction because the DPA calculated by total cross sections is 2.3percent lower the sum of the above three components.
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https://hal-cea.archives-ouvertes.fr/cea-02339666
Contributor : Bibliothèque Cadarache <>
Submitted on : Wednesday, October 30, 2019 - 3:06:07 PM
Last modification on : Tuesday, April 28, 2020 - 11:28:13 AM

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  • HAL Id : cea-02339666, version 1

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CEA | DEN

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S. Chen, D. Bernard, L. Buiron. Study of self-shielding in dpa calculations. Nuclear Engineering and Design, Elsevier, 2018. ⟨cea-02339666⟩

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