Operators Declare, Exit Site Area Emergency at LaSalle Station

Feb 20, 2006, 00:00 ET from Exelon Nuclear

    WARRENVILLE, Ill., Feb. 20 /PRNewswire-FirstCall/ -- Operators at the
 LaSalle Generating Station declared a "site area emergency" at 12:28 a.m.
 (CST) Monday during shutdown of the Unit 1 reactor for a scheduled refueling
 outage and exited the emergency condition at 4:27 a.m. Monday.
     The emergency was declared after plant personnel were unable to confirm
 the position of 3 of the 185 control rods following a shutdown of the reactor.
     There were no injuries, no radiological releases from the plant and no
 equipment damage.
     The Unit 1 reactor was safely shut down and remains in that condition.
 After operators reset the rod position indication system, only one rod of the
 185 control rods indicated out of position.  The plant is designed to remain
 safely shutdown in this condition.  As a result, the station exited the
 emergency condition according to procedures at 4:27 a.m.
     Exelon Nuclear personnel are working to determine why the control rod
 indications showed that rods were not inserted properly.
     A site area emergency is the second highest level of federal emergency
 classification established by the U.S. Nuclear Regulatory Commission.
     The shutdown of LaSalle Unit 1 will not affect Exelon Nuclear's ability to
 meet power supply commitments.
     LaSalle Generating Station is in Brookfield Township in LaSalle County,
 Ill., about 55 miles southwest of Chicago. Unit 1 began commercial service in
 1982 and Unit 2 in 1984. Each of the LaSalle's two boiling water reactors
 produces about 1,197 megawatts.
     Exelon Corporation (NYSE:   EXC) is one of the nation's largest electric
 utilities with approximately 5.2 million customers and more than $15 billion
 in annual revenues.  The company has one of the industry's largest portfolios
 of electricity generation capacity, with a nationwide reach and strong
 positions in the Midwest and Mid-Atlantic.  Exelon distributes electricity to
 approximately 5.2 million customers in northern Illinois and Pennsylvania and
 gas to more than 460,000 customers in the Philadelphia area.  Exelon is
 headquartered in Chicago and trades on the NYSE under the ticker EXC.

SOURCE Exelon Nuclear