MOX@EON: EON Operational Experience - US Nuclear Waste ...
MOX@EON: EON Operational Experience - US Nuclear Waste ...
MOX@EON: EON Operational Experience - US Nuclear Waste ...
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Practical Aspects of MOX - Handling (2): Transients<br />
Most pronounced examples:<br />
1. ATWS: more negative Γ T helps voiding and reduces heat input at<br />
ATWS<br />
2. LOCA: PCT higher in MOX - ECR not limiting in KWU-plants (2 min);<br />
core failure rates (German safety criterion) higher in mixed cores;<br />
0,40 0,45 0,50 0,55 0,60 0,65 0,70 0,75<br />
0,00<br />
6<br />
ρ (%)<br />
-2,00<br />
-4,00<br />
-6,00<br />
Uran<br />
MOX<br />
Frequency distribution<br />
[% of fuel rods in the core]<br />
5<br />
4<br />
3<br />
2<br />
all<br />
UO 2<br />
UO 2<br />
/Gd 2<br />
O 3<br />
MOX<br />
-8,00<br />
1<br />
-10,00<br />
moderator-density (g/cm 3 )<br />
0<br />
0 50 100 150<br />
Fuel rod inner pressure [bar]<br />
FIG. 5. Resulting distribution of rod internal pressures in the core of a German 16x16<br />
PWR with 45370 FRs containing UO 2, UO 2/Gd 2O 3, and MOX fuel<br />
16
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