MIDDLETOWN, Pa.—Emergency sirens have been scheduled for testing
again at the Three Mile Island nuclear power plant.  The latest
test will see the sirens sounding for several minutes about
12:15 p.m. Thursday.  The new sirens will eventually replace an
older system still in place, but that won't happen until the new
sirens pass several more tests.  The 96 sirens are located
within 10 miles of the plant, and are in place to warn residents
of a nuclear accident.  The plant in Middletown, near
Harrisburg, is owned by Exelon.