* Severe storms moving across TVA transmission area
* Rainfall boosts hydro output along Tennessee River
* Nuclear reactors shut after losing outside power (Updates power status at nuclear plant)
HOUSTON, April 27 (Reuters) - Severe storms and tornadoes moving through the U.S. Southeast dealt a severe blow to the Tennessee Valley Authority on Wednesday, causing three nuclear reactors in Alabama to shut and knocking out 11 high-voltage power lines, the utility and regulators said.
Governors in Alabama, Arkansas and Tennessee each declared a state of emergency as more than 20 deaths were blamed on a recurring round of severe storms this week moving eastward across the southern United States. [ID:nN27120833]
All three units at TVA's 3,274-megawatt Browns Ferry nuclear plant in Alabama tripped about 5:30 EDT (2230 GMT) after losing outside power to the plant, a spokesman for the U.S. Nuclear Regulatory Commission said.
A TVA spokeswoman said the station's backup power systems, including diesel generators, started and operated as designed. External power was restored quickly to the plant but diesel generators remained running Wednesday evening, she said.
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