June 3 (Reuters) - The U.S. Nuclear Regulatory

Commission has launched a special inspection at the Quad Cities

Generating Station in Illinois, to review two events caused by

battery issues, the agency said on Tuesday.

Constellation Energy ( CEG ) operates the two-unit plant

in Cordova, Illinois.

The first event involved a unit 1 scram caused by a degraded

condition on a unit 2 battery, while the second event involved a

notice of unusual event, due to a brief fire on the same unit 2

battery, the NRC said in a press release.

"While the plant remained safe during these occurrences, an

independent review by the regulator is warranted, given

questions related to battery problems at the root of both

events," said Jack Giessner, region three administrator.

Constellation Energy ( CEG ) was not immediately available for

comment.

The NRC recently completed a special inspection at the plant

to review the inoperability of safety-related vacuum breakers,

it said.