CAPE CANAVERAL, Fla. (May 16, 2013)--An impromptu spacewalk to install a new pump seems to have fixed a big ammonia leak at the International Space Station, NASA said Thursday.
The "gusher" erupted on May 9.
Two days later, spacewalking astronauts replaced a suspect ammonia pump.
NASA now calls the old, removed pump "Mr. Leaky."
On Thursday, a Mission Control official said the repairs definitely took care of the big leak.
Engineers don't know whether the pump replacement also took care of a smaller leak that has plagued the system for years. It will take at least a couple months of monitoring to know the full status.
Ammonia is used as a coolant in the space station's radiator system.
The leak forced one of the station's seven power channels to go offline.
NASA hopes to resume normal operations early next week.