PLUS7
- 1 Reconstitutable top nozzle
- 2 Inconel grid
- 3 Mixing vaned mid grid
- 4 Protective grid for debris filtering
- 5 Debris filtering bottom nozzle
- 6 High burn up fuel rod
PLUS7 is an advanced nuclear fuel assembly for Korean standard nuclear reactors. KNF successfully performed in-pile evaluation of LTA (Lead Test Assembly) following completion of its development in the year of 2002 and has been supplying this world-class nuclear fuel to local nuclear power plants since April 2006.
PLUS7 was developed from the previous fuel called Guardian which is supplied by Westing house Electric Company, and it has 7 improved performance factors:
- 1st, Improvement of neutron economy through optimized fuel rod diameter.
- 2nd, Improvement of seismic resistance through high strength grid design.
- 3rd, Improvement of grid-to-rod fretting wear resistance through mid-grid springs and dimple design.
- 4th, Improvement of fuel productivity through integral top nozzle.
- 5th, Improvement of debris filtering efficiency through protective grid and small hole/slot of bottom nozzle.
- 6th, Achievement of high burn-up capability from 45,000 MWD/MTU up to 55,000 MWD/MTU in comparison to Guardian, the conventional fuel.
- 7th, Enhancement of thermal margin by more than 10%.