LONDON, May 11 (Reuters) - U.S. oil company Chevron <CVX.N> said Friday it was evacuating hundreds of nonessential personnel from offshore operations in Nigeria due to security concerns.

Chevron spokesman Michael Barrett said the evacuation would not further affect the company's production in Nigeria.

"We are temporarily suspending some nonessential work activity in offshore operations to ensure the safety and security of our workforce," he said. "The number of personnel impacted is going to be in the hundreds."

Militant attacks this month have prompted Chevron to cut production by 42,000 barrels per day at its Escravos oilfields and by 15,000 bpd at its Pennington terminal.

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