NASA moves up 1st all-female spacewalk to fix power unit

CAPE CANAVERAL, FLA. >> NASA is moving up the first all-female spacewalk to this week because of a power system failure at the International Space Station.

Astronauts Christina Koch and Jessica Meir will now venture out Thursday or Friday, instead of next Monday, to deal with the problem. It will be the first spacewalk prompting the change, NASA officials said Monday. The women will replace the broken component, rather than install new batteries, which was their original job.

Last week, astronauts conducted the first two of five spacewalks to replace old batteries that make up the station’s solar power network. The remaining spacewalks — originally scheduled for this week and next — have been delayed for at least another few weeks so engineers can determine why the battery charger failed. It’s the second such failure this year.

The devices regulate the amount of charge going to and from each battery. One didn’t kick in Friday night, preventing one of the three newly installed lithium-ion batteries from working. The balky charger is 19 years old; the one that failed in the spring was almost as old. Only three spares remain available.

“It’s absolutely a concern at this point when you don’t know what’s going on,” said Kenny Todd, a space station manager. “We’re still scratching our heads looking at the data. Hopefully, we can clear that up in relatively short order.”

Despite the slight loss of power, the orbiting lab and its six occupants are safe, according to NASA, and science operations are unaffected. The current situation is “manageable, but again not something that we would want to live with in the long term,” Todd told reporters.

NASA originally planned an all-female spacewalk last spring, but had to cancel it because of a shortage of readily available mediumsize suits. Koch helped assemble an extra medium suit over the summer.

“Very good that we have 4 expert spacewalkers on board to shoulder this tough task. They are the A-team!” tweeted astronaut Anne McClain, who would have gone spacewalking with Koch in March if not for the suit-sizing issue.