Cosmonauts Find Radiator Coolant Leak on ISS During Spacewalk Written 26 October 2023

Spaceflight Now reports that two Russian spacewalkers “floated outside the International Space Station Wednesday and isolated a leaking radiator as planned, apparently causing residual coolant still trapped inside to make its way to the leak site and spew out into space.” Cosmonaut Oleg Kononenko “planned to sop up the pooling coolant with a cloth towel, but was told to leave the area immediately when he reported some of the liquid had made it onto a safety tether.” The tether “was secured in a bag and procedures were already in place to make sure the cosmonauts’ spacesuits were clear of any such contamination before they re-entered the space station at the end of the spacewalk.” In the meantime, Kononenko and crewmate Nikolai Chub “pressed ahead with work to attach a small synthetic aperture radar antenna to the hull of the Nauka module.” One of its four panels “failed to fully deploy and lock in place, and officials said adjustments would be made in a future spacewalk.” Finally, Kononenko and Chub “released a small student-built ‘nanosatellite,’ but the solar sail propulsion system it was designed to test failed to deploy.” After making a final attempt “to coax the balky radar panel into place, the cosmonauts called it a day.”
Full Story (Spaceflight Now)