NASA engineers are planning some big Saturday chores for the astronauts at the international space station. The centerpiece project is a spacewalk to try to fix a couple of rips in a solar panel. It tore while being unfurled by astronauts Tuesday, apparently snagging a support for one of the solar wing's guide wires. Engineers don't want to reel it in for fear of causing further damaging, and the station's robot arm is too short to reach the torn section. So NASA plans to attach the shuttle inspection boom to the arm and send one of the astronauts up on it to free the snag. Space station program manager Mike Suffredini says ignoring the wing damage could allow the problem to worsen and possibly lose its ability to collect power. If that happens, it would have to be junked. The other major issue also involves the space station's power supply. A rotary joint that allows another set of solar panels to turn toward the sun is snarled. The astronauts had planned to inspect it on a spacewalk today, but that's been put off to deal with the rips.