In an almost eight hour spacewalk yesterday, two Russian astronauts were able to locate the source of the coolant leak on a radiator unit connected to the new Nauka module on the Russian half of ISS.
The image to the right, a screen capture from the live stream, shows the leak location, where a small white droplet sits on one of the coolant lines that connect two radiator panels. You can also see darkening on the tubes to either side, likely also caused by the leaking ammonia. To locate it ground controllers opened valves to let coolant into the line while the astronauts watched for changes, and were able to see the coolant come out of this spot.
One astronaut also noted the following during the inspection:….
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