Cargo flight delayed amid coolant valve troubleshooting [Spaceflight Now]

ISSの冷却系故障とその復旧作業に伴いシグナス補給船の打ち上げが延期される模様。

No final decisions have been made, but if the spacewalks are required they likely will be targeted for Dec. 19 and 21, with a third excursion held in reserve Dec. 23 if more time is needed. If the spacewalks are ordered, Orbital Sciences would delay launch of the company's Cygnus cargo ship until early to mid January.

最も早い場合でも1日延期で日本時間の12月20日、船外活動が必要な場合は年明け1月中旬となるそうです。