Covarancies of resonance self-shielding factor and its temperature gradient for uncertainty evaluation of Doppler reactivity

Uncertainty of Doppler reactivity is theoretically formulated and then uncertainties of self-shielding factor and its temperature gradient due to errors of resonance parameters were evaluated from NJOY output. Sensitivity analysis was made for ²³⁵U, ²³⁸U, ²³⁹Pu and ²⁴⁰Pu of JENDL-3.3 based on JFS-3 70 group structure. Resultant sensitivity coefficients are provided for the uncertainty evaluation of Doppler reactivity.