Analysis Of The PWR Primary Shield With 3-D S_N Method

Discrete Ordinates(S_N) method is one of the most widely used method for the shielding design in the field of nuclear engineering due to its powerful capability to treat deep-penetration shielding problem.According to shielding design enchiridion,this thesis has studied the PWR(Pressurized Water Reactor) main shielding calculation with 3-D S_N code in our country.The key parameters were gain such as 3-D neutron and photon flux distribution, inner surface and 1/4 thick of the RPV fast neutron(E＞1.0MeV,E＞0.1MeV) flux distribution at axial and loop direction,neutron and photon dose rate and heat rate distribution in concrete wall.Meanwhile,the sensitivity of the source intensity,spectrum,temperature of the reflector were analyzed,it prove that 3-D S_N approach can be used for PWR main shielding calculation.The multi-group cross-section file based on ENDF/B-Ⅶevaluated nuclear data file MUSE1.0 were validated with H.B.R-2 benchmark,the result indicates that MUSE1.0 satisfies the accuracy requirement of PWR main shielding calculation.