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US spacewalkers completed coolant system repairs.
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On December 24, 2013 US astronauts Richard Mastraccio and Michael Hopkins performed a spacewalk. The spacewalk began at 11:53 UTC. Two astronauts successfully installed a replacement coolant pump aboard the International Space Station, completing a high-stakes two-spacewalk repair job and clearing the way for flight controllers to re-activate a critical coolant system. The spacewalk lasted 7 hours and 30 minutes.
