APRIL 20, 2015
ALBUQUERQUE, NEW MEXICO
Dozens of drums of radioactive
waste at one of the nation's premier weapons laboratories are stable after some
showed signs of chemical reactions over the past year, according to federal
officials.
The drums are being closely monitored after a chemical
reaction inside a container with similar contents caused a breach in February
2014, resulting in a radiation release and the indefinite closure of the
country's only underground nuclear waste dump.
Investigators with the U.S. Energy Department confirmed
during a recent town hall that there have been chemical reactions in the
containers stored at Los Alamos National Laboratory, but the gases building up
inside have decreased over the past several months.
"That would suggest that the reaction, if it is
occurring, is slowing down. It's reached a steady state, and it has
stopped," said John Marra, chief research officer for Savannah River
National Laboratory and one of the investigators who reviewed the cause of the
2014 radiation leak at the Waste Isolation Pilot Plant in southern New Mexico.
Monitoring of the temperature and the gases - which can
include hydrogen, carbon dioxide and nitrous oxide - has provided evidence of
fluctuation inside the drums remaining at Los Alamos.
"Some of it is just normal oxidation, but some of it
may be at a different rate than others. Every drum is unique," said Ted
Wyka, head of the Energy Department's Accident Investigation Board.
Wyka added that none of the changes has been at the same
level and rate as the drum that popped its lid after being placed into storage
at Waste Isolation Pilot Plant.
Still, Marra and others warned during the public meeting in
Carlsbad last week that managers at the Los Alamos lab will have to consider
the hazards of handling the drums as they craft a plan for permanent disposal.
The closure has delayed cleanup of legacy waste like
contaminated gloves, tools and clothing from decades of bomb-making across the
federal government's nuclear complex. In its 15 years of operation, the nuclear
dump received shipments from more than 20 different sites as part of the Energy
Department's multibillion-dollar-a-year cleanup program.
Investigators say the combination of those ingredients and
the way they were placed inside the drum spurred the chemical reaction that
resulted in the breach at the Waste Isolation Pilot Plant.
As a precaution, the remaining drums at Los Alamos were
packed in protective waste boxes last May and placed in domed vaults that are
temperature controlled and have filtration systems.
There have been no signs of concern in any of the drums, lab
director Charlie McMillian told staff in a memo last week.
Source: http://www.cbsnews.com