SAN CLEMENTE (CBS) — Officials will be testing the emergency siren system at the San Onofre Nuclear Generating Station Wednesday.

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The system, which alerts neighboring communities in the event of a disaster, will undergo annual testing for two hours.

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Between 10 a.m. and noon, 50 sirens located in communities around the plant will be activated several times for about three minutes each.

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Officials are advising residents in Dana Point, San Clemente, San Juan Capistrano and Camp Pendleton not to be alarmed.