Space station leak fixed

Astronaut Robert Behnken participates in the mission's second session of extravehicular activity as construction and maintenance continue on the International Space Station. (AP Photo)
Astronaut Robert Behnken participates in the mission's second session of extravehicular activity as construction and maintenance continue on the International Space Station. (AP Photo)
Cape Canaveral - Nasa says an impromptu spacewalk seems to have fixed a big ammonia leak at the International Space Station.

The "gusher" erupted last Thursday. Two days later, spacewalking astronauts replaced a suspect ammonia pump. Nasa is now calling the old, removed pump "Mr Leaky".

On Thursday, a Mission Control official said the spacewalking 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.

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