Study on the Impact of Thermal Agitation on Doppler Coefficient in Epithermal Range for Gd-Bearing Fuel

Table 1

Calculation conditions.

Fuel
Material	UO2 with Gd2O3
U-235 enrichment	4.8 wt%
Gd2O3 concentration	0~20 wt% using following Gd vector
	Gd-152: 0.2 wt%
	Gd-154: 2.2 wt%
	Gd-155: 14.8 wt%
	Gd-156: 20.5 wt%
	Gd-157: 15.6 wt%
	Gd-158: 24.8 wt%
	Gd-160: 21.9 wt%
Temperature	600 K, 900 K
Cladding
Material	Zircalloy-4
Temperature	600 K
Coolant
Material	H2O
Temperature	600 K
Boundary condition	White reflection