CAPE CANAVERAL, Fla., July 20 (Reuters) - After a tiring day of spacewalking, astronauts can enjoy at least one creature comfort: a working toilet.

While spacewalkers David Wolf and Thomas Marshburn worked outside the International Space Station on Monday stashing spare parts, crewmates repaired the outpost's broken toilet.

With a record 13 people aboard the station, it wasn't a good time for the station's main commode, which is connected to a water and urine recycling system, to fail.

The crews had to use toilets in the Russian side of the station and on shuttle Endeavour.

Overuse of the shuttle's toilet could have been a problem because its water tank can't be emptied while Endeavour is parked at the station. Dumping the wastewater overboard, which is typically how the tank is emptied, might contaminate the station's new outdoor experiments porch, which was installed during a spacewalk on Saturday.

On Monday, Wolf and Marshburn positioned a spare pump and other gear that may be needed to keep the station operational after the shuttle fleet is retired next year.

The shuttle crew has three more spacewalks planned during their 11-day visit to the station.

(Reporting by Irene Klotz, editing by Jane Sutton)

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