Spacewalking astronauts isolated an International Space Station thermal control system radiator with a suspected leak during a 6 hr., 30-min. Nov. 1 spacewalk in which they also rerouted the flow of ammonia coolant to a backup circulation loop. The elusive leak on the photovoltaic radiator (PVR) of the P-6 solar power module, first noted in 2007, increased substantially in June. The loss threatens to prompt a shutdown of the station’s 2B power channel, one of eight channels that ...

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