Study on the relation between Doppler reactivity coefficient and resonance integrals of Thorium and Uranium in PWR fuels

•We used sensitivity coefficient to decompose Doppler reactivity coefficient.•Relative change of capture cross-section of Th-232 is larger than that of U-238.•Narrower resonance is more sensitive to Doppler Effect than wider one.•Resonance width has a large impact on Doppler reactivity coefficient.