An application of the LSWCR(lower shifted worth control rod) for the power maneuvering fir pressurized water reactor

In this research, Two lower shifted worth control rods (LSWCR) are suggested to mitigate problems related to variation of axial power distribution during power maneuvering. Then, two experiments are performed. The one experiment is in condition that the LSWCR1 is fixed at bottom of the core and the LSWCR2 is moved, and the other experiment is in condition that LSWCR2 is fixed at half of the core, and the LSWCR1 is moved. From the application results, it is shown that the insertion of LSWCR at 100% power equilibrium state, can produce the required reactivity to return to full power, and a boron concentration change is minimized. It seems possible that a combinative use of LSWCRI and LSWCR2 controls AO within the target AO band