NASA scrambles to fix bad pump
CAPE CANAVERAL, Fla. - Astronauts in orbit and on the ground practiced Monday for a major repair job later this week at the International Space Station, struck by a cooling-system failure.
CAPE CANAVERAL, Fla. - Astronauts in orbit and on the ground practiced Monday for a major repair job later this week at the International Space Station, struck by a cooling-system failure.
The weekend malfunction knocked out half of the space station's cooling system, forcing the crew of six to turn off unnecessary equipment and halt scientific work to avoid any overheating.
NASA's space station program manager, Mike Suffredini, ranked the problem as one of the most serious in the 12-year history of the orbiting lab but stressed that the outpost could keep going indefinitely given the current situation. The fear is that the second cooling loop could shut down and leave the station in precarious shape.
For now, "everything the crew needs to survive, they're in good shape; all those systems are active," Suffredini said Monday. "What we're talking about, really, is it would be a significant challenge if we suffered the next failure."
Another practice session was set for Tuesday. Two Americans on board, Douglas Wheelock and Tracy Caldwell Dyson, will venture out on a space walk to replace the pump Thursday. A second space walk will be needed to finish the job, probably Sunday.
The 780-pound pump is difficult to handle, and the astronauts will need to guard against any hazardous ammonia leaks. Engineering teams have been working nonstop since the right-side cooling loop shut down Saturday night. A pump that drives ammonia coolant through those lines failed when a circuit breaker tripped.
The electrical short is believed to be internal to the pump. Engineers believe a new pump will solve the problem, but there is no guarantee, Suffredini noted. Four spare pumps are on board.
"This is an anomaly we knew some day would happen," Suffredini said. "We're in a good position to go solve this problem. It is a significant failure, though, in terms of systems."
























