Molten Salt Reactor
BY JOHN KUTSCH
company’s proprietary design in
which all the primary components
(pumps, moderator and primary
HX) of the reactor core are sealed
in a compact and replaceable component, the IMSR Core-unit.
• A new Core-unit is exchanged every 7 years with the old Core-unit
stored on site.
• The IMSR is a “pool-type” reactor
with no penetrations into the reactor vessel.
• IMSR fuel, the Fuel Salt, is a liquid,
high-temperature fluoride salt
that operates at ~700C.
• These salts have high thermal stability and are excellent heat transfer liquids.
• IMSR Fuel salt can be produced
today with current methods and
within current regulations.
• The Fuel Salt, which contains the
nuclear fuel, never leaves the reactor core vessel during operation.
• Fuel Salt is circulated in a closed
provision, which is compact, efficient,
and cost-competitive with fossil fuels.
The IMSR is a Gen 4 reactor and a suc-
cessor of the very effective Molten Salt
Reactor Experiment work of Oak Ridge
Terrestrial Energy USA is now work-
ing with Idaho National Laboratory to
couple the IMSR to advanced industrial
systems. Several systems have been de-
signed and proposed. These can serve
energy-intensive industries with stable
heat and power for clean H2, O2 pro-
duction, and by extension ammonia and
Desalination is also a very significant
market sector for IMSR heat and power.
IMSR has the potential to be a transformative technology. When coupled
with advanced industrial systems,
IMSR enables new, transformative
HOW THE INTEGRAL
MOLTEN SALT REACTOR
• The term ‘Integral’ refers to the
John Kutsch is vice president of Business
Development for Terrestrial Energy USA.
n IMSR power plant can rapidly load follow grid power
emand. Photo courtesy: Terrestrial Energy USA