Mission specialists Stephen Bowen and Alvin Drew are also to install a power extension cable between the U.S.-built Unity module, or node, and the Italian-made Tranquility node to provide a contingency power source in case it's needed, NASA said.

Bowen was added to the crew last month after lead spacewalker Tim Kopra was injured in a bicycle accident. Bowen did five earlier spacewalks and flew aboard the shuttle Atlantis last May.

During Monday's spacewalk, scheduled to begin at 11:18 a.m. EST, Drew and Bowen are also scheduled to install a piece of hardware that will go under an external camera. The hardware will tilt the camera to provide clearance for a spare part to be installed on a future mission.

In addition, they are scheduled to replace a guide for the rail cart system used for moving cargo along the integrated truss structure. The 356-foot-long truss structure is the space station's largest component, holding the station's main solar panels and thermal radiators.

The guides were earlier removed when astronauts did work on a joint attached to the truss that rotates, letting solar panels track the sun.

The refrigerator-size ammonia coolant pump, which failed in August, will be moved from a payload attachment bracket to an external stowage platform next to the Quest joint airlock, which the astronauts will use to exit the space station and return to it.

The astronauts are scheduled to have another 6 1/2-hour spacewalk Wednesday.

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