Moderating Material to Compensate the Drawback of High Minor Actinide Containing Transmutation Fuel on the Feedback Effects in SFR Cores

Table 3

Feedback effects and absorber worth for the cases with different transmutation fuels.

	UMOX; 2% Am 2% Np	+ZrH; 2% Am 2% Np	UMOX; 3% Am	+ZrH; 3% Am	UMOX; 5% Am	+ZrH; 5% Am	+ZrH 8% Am	1.2*ZrH 8% Am
Doppler effect 𝑇𝑓 + 100 K
BOL	−30.2%	59.7%	−23.0%	73.8%	−36.4%	49.4%	𝟏𝟖.𝟗%	𝟑𝟏.𝟗%
EOL	−26.9%	52.2%	−20.2%	65.2%	−30.9%	46.8%	𝟏𝟖.𝟕%	𝟑𝟐.𝟑%
Coolant effect 𝑇c + 50 K
BOL	4.9%	−8.1%	5.7%	−11.7%	12.2%	−4.6%	𝟐.𝟏%	−𝟎.𝟐%
EOL	0.9%	−12.0%	2.1%	−11.3%	1.2%	−14.2%	−𝟏𝟑.𝟑%	−𝟏𝟓.𝟎%
void effect
BOL	9.2%	−5.3%	6.9%	−8.1%	10.7%	−3.2%	𝟐.𝟕%	𝟎.𝟗%
EOL	−0.2%	−11.8%	−0.4%	−12.5%	−0.6%	−12.3%	−𝟏𝟏.𝟗%	−𝟏𝟑.𝟗%
Absorber rod worth
BOL	−7.8%	−3.6%	−6.0%	−1.6%	−9.6%	−5.6%	−𝟏𝟏.𝟏%	−𝟏𝟎.𝟔%
EOL	−9.5%	−5.0%	−6.9%	−2.0%	−11.1%	−6.8%	−𝟏𝟑.𝟑%	−𝟏𝟐.𝟗%