How to use owa-epanet to automatically find junctions within the circle with a certain radius in a water distribution network

Hello,
I need to using owa-epanet to find all junctions within the circle with a certain radius. So could you please tell me what code can I use to draw a circle having a radius of 250 meters centered on a junction represented by its coordinates and what code can I use to find all junctions within this circle?

For example, if x and y coordinates of a junction is 1200, 245 respectively, there will be a circle with a 250 meters radius centered on the junction. So what code can I use to to draw this circle and find all junctions within this circle using owa-epanet.

Thanks in advance!