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Abstract
A new concept is presented for monitoring and control of radial xenon oscillation in PWRs. This concept is based on a similar concept which has been developed and verified in domestic PWR plants for axial xenon oscillation control. It utilizes not only axial offset or core tilt of power distributions but also uses information of power distributions inversely calculated from the current iodine and xenon concentrations in respective core regions. Based on this concept, the operators are provided with the information of the timing, the amount of steps and the direction of control rod operation from a trajectory on the monitor display. Xenon oscillation can be eliminated by guiding the plot to the origin of the trajectory on the monitor display.