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Astronauts make spacewalk to fix cooling problem on ISS =
Published in Saudi Press Agency on 07 - 08 - 2010


Two astronauts left the International Space
Station on Saturday to perform a complicated spacewalk to fix a
broken cooling system that last weekend prompted the shutdown of some
systems onboard the orbiting spacecraft, reported dpa.
Doug Wheelock and Tracy Caldwell Dyson will replace the broken
350-kilogramme ammonia cooling loop with a spare part stored about 10
metres away outside the ISS during the planned seven-hour spacewalk
that began at 1119 GMT.
A second spacewalk to hook up cables and wire the part into the
station is scheduled for Wednesday.
The system is one of two used to keep electronics on the ISS from
overheating. Last Saturday, alarms were triggered signalling that the
ammonia-based refrigeration system on the ISS had failed due to a
power surge.
NASA officials stressed that the six crew members were in no
danger, and all critical and many non-critical systems on the ISS
were since operating as normal despite the malfunction.
The ISS could continue to operate without the cooling system
indefinitely, but would be in trouble if the second ammonia cooling
loop were to also fail before the first is replaced.
Wheelock and Caldwell Dyson had already trained to replace this
part, despite the effort being unplanned, as part of NASA's efforts
to prepare ISS crew members for contingencies aboard the station.


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