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NASA suspects bad valve for space station trouble
NASA suspects valve for space station trouble, astronauts safe but some equipment shut down
By MARCIA DUNN
Associated Press
2013-12-12 11:42 PM

CAPE CANAVERAL, Florida (AP) -- NASA is scrambling to figure out what's wrong with a key cooling unit on the International Space Station.

On Wednesday, one of two identical cooling loops shut down. The system uses ammonia to dissipate heat from on-board equipment. One line was getting too cold. Engineers suspect a bad valve.

Mission Control ordered the six-man crew to turn off some science experiments and other non-critical equipment. Those instruments stayed off Thursday, while the astronauts remained safe and comfortable.

The suspect valve is in a pump that was replaced by spacewalking astronauts three years ago. Flight controllers are looking at ways to fix the valve. A software repair would be the easiest option, a spacewalk the most complicated.

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