Fuel leaks threaten to delay launch of new NASA moon rocket

The NASA rocket was set to lift off on a mission to put a crew capsule into orbit around the moon

Fuel leaks during final liftoff preparations threatened to postpone the launch of NASA’s mighty new moon rocket Monday morning on its shakedown flight with three test dummies aboard.

As precious minutes ticked away, NASA repeatedly stopped and started the fueling of the Space Launch System rocket with nearly 1 million gallons of super-cold hydrogen and oxygen because of a leak. The fueling already was running nearly an hour late because of thunderstorms off Florida’s Kennedy Space Center.

The leak of highly explosive hydrogen appeared in the same place that saw seepage during a dress rehearsal back in the spring.

Then a second apparent hydrogen leak turned up in a valve that had caused trouble in June but that NASA thought it had fixed, officials said.

Later in the morning, NASA officials spotted what they feared was a crack or some other defect on the core stage — the big orange fuel tank with four main engines on it — but they later said it appeared to be just a buildup of frost.

The rocket was set to lift off on a mission to put a crew capsule into orbit around the moon. The launch represents a milestone in America’s quest to put astronauts back on the lunar surface for the first time since the Apollo program ended 50 years ago.

NASA’s assistant launch director, Jeremy Graeber, said after the repeated struggles with the first leak that the space agency would have to decide whether to go forward with the Monday morning launch.