NASA Previews Spacewalks to Replace ISS Coolant Pump

During NASA Television press briefing from Johnson Space Center, agency managers discussed a series of planned spacewalks, Dec. 21, 23 and 25 by NASA astronauts Rick Mastracchio and Mike Hopkins to replace a faulty coolant pump on the International Space Station. The pump is associated with one of the station’s two external cooling loops, which circulate ammonia outside the station to keep both internal and external equipment cool.

The previously planned Orbital Sciences commercial cargo resupply mission to the International Space Station has been postponed until no earlier than mid-January. The postponement will allow ample time for the station crew to focus on repairing the pump module, which stopped working properly on Dec. 11.

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