UPDATE 1-BC Partners in $331 mln bet on U.S. career training

* To buy Texas-based ATI Enterprises

* BC to spend up to $331 million from current fund

* Roughly $250 mln of debt also backing buy from Riverside

* Management to keep 12 percent stake in company

(Updates with confirmation from BC)

LONDON, Nov 10 (Reuters) - Private equity firm BC Partners [BCPRT.UL] is staking up to $331 million on strong growth in U.S. career training, buying Texas-based ATI Enterprises from middle-market rival The Riverside Company.

BC will invest the money from its current fund, alongside roughly $250 million of debt, to buy ATI, which offers courses in subjects such as welding, dental assisting and personal training.

London-headquartered BC said on Tuesday said it saw an "attractive market opportunity supported by underlying demographics, economics and government attention on education."

It expected ATI to generate revenue of $245 million in 2009.