A problem with one of the International Space Station's cooling systems may require a repair spacewalk, NASA told NBC News on Wednesday.
The situation doesn't represent a life-threatening emergency, but it has required a cutback in normal operations on the orbiting outpost, NASA spokesman Josh Byerly said.
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"The crew was never in any danger," he said. "They're fine for the near future."
The problem is one of the "Big 14" maintenance issues that NASA and its partners expect to face on an occasional basis during space station operations. "This is the kind of thing that they expected to happen, at about the expected rate," NBC News space analyst James Oberg said.
One of the station's two external cooling loops, known as Loop-A, shut down when it reached a pre-set temperature limit on Wednesday, Byerly told NBC News.