Resonance self-shielding calculation for complicated fuel assembly

Resonance self-shielding calculation is a very important part of the reactor core design calculation. The traditional self-shielding model can only simulate the simple geometry. The subgroup self-shielding model developed by A. Hebert was utilized to develop a self-shielding calculation code. It can treat complicated geometry with two resonant isotopes contained in fuel region. Numerical results presented for many problems show that this model can get high accurate results when the fuel enrichment is low.