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NuclearPlantJournal.com Nuclear Plant Journal, March-April 2016
Deposit
Minimization...
The four MP3 steam generators were
cleaned in sets of two in series in
conjunction with other outage activities
off critical path over a period of nine
days, including one scheduled day off
for entire crew, and finished ~37 hours
ahead of the projected schedule. A hard
chemical cleaning would have resulted in
an additional 8 days of critical path time.
Regarding the effectiveness of
the process, 11,552 pounds of deposit
material were removed from the MP3
SGs, a new record for soft cleaning
processes, and a prompt, sustained steam
pressure return of greater than 12 psi
was observed. This result exceeded the
expectations of Millstone management.
In addition, waste processing
performance was improved over previous
applications of the DMT process. Prior to
late 2013, all previous DMT’s performed
in the US used hydrogen peroxide
as the oxidant to decompose oxalic
acid. AREVA implemented an ozone
generation system into the DMT process
that allows high concentrations of oxalic
acid to be decomposed more efficiently
than with the hydrogen peroxide. Since
2013, efficiency of the decomposition
process has continued to improve. This
process improvement was a product of
changing the process parameters and
application methodology to maximize
the efficient use of ozone, thus resulting
in a time savings of 20% over hydrogen
peroxide use for decomposition of the
DMT process solutions.
Transferability
Response
DMT was developed to reduce
the deposit inventory on the secondary
side of steam generators in PWRs and
as such, works in any PWR steam
generator regardless of the NSSS design.
However, the DMT process technology
is also readily adaptable to other
components, systems, and industries
where predominantly iron-based deposit
accumulation and hazardous waste
disposal is a concern. The versatility of the
organic acid as the complexing agent, and
the simplified application methodology,
enables the process to be applied to nearly
any industrial component that requires
cleaning. The process is applicable to
any BWR or PWR heat exchanger or
Balance of Plant system.
Contact: Richard Seel, Dominion
Nuclear, telephone: (860) 447-1791,
at a U.S. reactor, the ninth deployment of
the innovative inspection tool.
Through advanced camera and
remote positioning technology Stinger
is able to examine the complete range of
components from the reactor vessel flange
to the annulus floor. Remote operation
of the tool allows for uninterrupted fuel
movement and significant dose savings
improvement by reducing the number of
inspection workers from the refuel floor.
The advanced visual inspection
capabilities of the tool allow data and high-
resolution video to be transmitted in real-time
for analysis by NRC-certified technicians
in Wilmington, N.C. With new camera and
lighting capability, Stinger now has the
ability to conduct cladding examinations on
reactor pressure vessel interior walls.
Contact: Jon Allen, GE Hitachi
Nuclear Energy, telephone: (910) 819-
2581, email:
.
Detritiation System
Kurion, Inc
., an innovator in
protecting people and the environment
from nuclear and hazardous materials, has
completed construction and acceptance
testing of its prototype Modular
Detritiation System
®
(MDS
®
) and has
initiated the system’s mission, which
is to push the technology for additional
performance through various experiments.
The MDS has completed an extensive
cold and hot commissioning phase and
is achieving its design goals based on
scaling-up its proven bench scale system.
This milestone comes less than six months
after Kurion announced the development
of the prototype system, delivering on
patent-pending technology that removes
tritium from contaminated water.
Kurion’s MDS is the world’s first
solution to process large volumes of light
water across a range of concentrations
to remove tritium contamination and
allows for the recycling or clean release
of reactor cooling water for light water
reactors. The technology builds upon
proven heavy water solutions and applies
advances in throughput and efficiency for
light water detritiation. Kurion’s MDS
Corporation...
DMT Project Area.
