imagination_APR1400
imagination_APR1400
imagination_APR1400
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18 Beyond your <strong>imagination</strong>_ <strong>APR1400</strong> CHAPTER_2 DESIGN<br />
4. Fuel Assembly<br />
The fuel assembly consists of fuel rods, spacer grids, guide tubes, and the upper and lower end fittings. 236<br />
locations of each fuel assembly are occupied by the fuel rods containing UO2 pellets or the burnable<br />
absorber rods containing Gd2O3-UO2 in a 1616 array. The remaining locations are the 4 CEA guide tubes<br />
and 1 in-core instrumentation guide tube for monitoring the neutron flux shape in the core. Each guide tube<br />
is attached to fuel assembly spacer grids and to upper and lower end fittings to provide a structural frame to<br />
position the fuel rods.<br />
The advanced fuel assembly, named PLUS7, is developed by Korea Nuclear Fuel (KNF) in accordance<br />
with <strong>APR1400</strong> development. This fuel assembly is enhanced in thermal hydraulic and nuclear performance<br />
and the structural integrity compared with a conventional fuel assembly as follows. The mixing vanes with<br />
high thermal performance, which induce a relatively small pressure loss, are adopted in all mid-grids to<br />
increase the thermal margin by more than 10 % that has been confirmed in Critical Heat Flux (CHF) test.<br />
The batch average burn-up is increased to 55,000 MWD/MTU through optimizing the fuel assembly and<br />
fuel rod dimensions and adopting an advanced Zirlo alloy as a fuel clad. The neutron economy is improved<br />
with the introduction of the axial blankets at both ends of the pellet region and the optimization of the fuel<br />
Fuel Assembly (PLUS7)
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