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NASA engineers continued efforts Sunday to regulate temperatures in one of two cooling loops on the International Space Station affected by the malfunction last week of a flow control valve in a cooling pump on the station’s starboard truss. Efforts overnight to fine-tune the position of an isolation valve associated with the flow control system in the Pump Module into a "sweet spot" to assist the faulty Flow Control Valve in regulating the affected cooling loop's temperatures were still being evaluated as engineers continue to review the data, valve positioning techniques and additional methods of temperature management in the loop. Meanwhile, parallel work is ongoing to either enable Orbital Sciences Corp. to launch its Antares rocket and the Cygnus cargo craft from the Wallops Flight Facility, Va. on Thursday night (Dec. 19) at 9:19 p.m. EST on its first resupply mission to the space station, or for Expedition 38 astronauts Rick Mastracchio and Michael Hopkins to mount a suite of spacewalks beginning Thursday to replace the faulty pump. The space station program continues to keep both options on the table pending further engineering analysis and troubleshooting efforts on the station's cooling system. Aboard the space station, Mastracchio and Hopkins continued to prepare their spacesuits and other equipment in the Quest airlock Sunday should they be called upon to conduct spacewalks to replace the pump module.
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