UPDATE 1-Brazil 2010 steel output seen up 24 pct on yr -IBS

(Adds details on domestic consumption, 2009 estimates)

RIO DE JANEIRO Dec 2 (Reuters) - Brazil's crude steel output is forecast to rise to 33.1 million tonnes next year, up 24 percent from an estimated 26.7 million tonnes this year, the Brazilian Steel Institute said on Wednesday.

The institute saw exports at 11 million tonnes next year, up 16 percent from 9.5 million tonnes in 2009.

Domestic consumption of steel in Brazil was forecast to grow 21.6 percent in 2010 to 22.9 million tonnes, after falling nearly 22 percent this year to 18.8 million tonnes, the institute said.

Steel output in 2009 was expected to fall nearly 21 percent from last year to 26.7 million tonnes. (Reporting by Pedro Silva; writing by Reese Ewing; Editing by Walter Bagley) ((reese.ewing@thomsonreuters.com; +5511-5644-7721; Reuters Messaging: reese.ewing.reuters.com@reuters.net))