Processing and Verification of Shielding Library Applicable for Fast Reactor

In the shielding calculation of PWR, BUGLE96 or its predecessor library is generally used, which has been widely verified and applied in engineering. However, the library is made for typical PWR and BWR by considering their shielding structure and physical properties, thus is not applicable to fast reactors. Therefore, it is necessary to develop a suitable shielding library according to the fast reactor's physical properties for its shielding calculation. In this paper, the coupled 199-group neutron and 42-group photon fine-group library is made according to the nuclide types, conditions and energy spectrum characteristics of fast reactors by using the NJOY code. The fine-group library contains 65 elements and 202 nuclides commonly used in fast reactors, the cross-section data has 7 temperature points, the Legendre expansion order of the scattering cross-section is P8, and the typical fast reactor energy spectrum is used as the weight spectrum. The fine-group library is then collapsed into a 47-group neutron and 20-group photon broad-group library. Finally, the shielding library is verified by the JANUS-I fast-spectrum benchmark. The results of radial reaction rate show that for the ³²S(n,p)³²P detector, the calculated values are within ±15% error to the experimental values, and for the ¹⁰³Rh(n,n')¹⁰³Rh^m detector, the error is within ±10%. All errors can be covered by the experimental measurement deviations. The results of axial relative reaction rate show that for the ³²S(n,p)³²P detector, the calculated values are within ±10% error to the experimental values, and for the ¹⁰³Rh(n,n')¹⁰³Rh^m detector, the error is within ±15%. The error meets the requirements of engineering calculation errors. Therefore, the shielding cross-section library processed in this paper is applicable to the shielding calculation of fast reactors and can be subsequently applied to the shielding design of advanced fast reactors.