tritium technology for iter - nucleus overview of fusion fuel cycle mass and energy flows iaea demo...
TRANSCRIPT
![Page 1: Tritium Technology for ITER - Nucleus overview of fusion fuel cycle mass and energy flows IAEA DEMO Workshop, Karlsruhe, 15-18 Nov 2016 Page 8 ITER UID: THR7JS Current and planned](https://reader033.vdocuments.site/reader033/viewer/2022051722/5aa2bf477f8b9a436d8d5665/html5/thumbnails/1.jpg)
IAEA DEMO Workshop, Karlsruhe, 15-18 Nov 2016 Page 1
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Disclaimer: The views and opinions expressed herein do not necessarily reflect those of the ITER Organization
Tritium Technology for ITER
Scott Willms
ITER Organization
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Outline
• Fuel Cycle Overview
• Comparison of ITER Fuel cycle to DEMO
• Distinguishing Characteristics of the ITER Tritium Plant Systems
• Technologies for ITER Tritium Plant Systems
– TEP – Tokamak Exhaust Processing
– ISS – Isotope Separation Systems
– SDS – Storage and Delivery System
– DS – Detritiation System
– WDS – Water Detritiation System
– ANS – Analytical System
• Fuel Cycle Modeling
• Gap Analysis to DEMO
• Conclusions
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Fuel Cycle Overview
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ITER Fuel Cycle
• DT loop fuel tokamak with T2 and D2
• D2 loop supplies neutral beams with D2 (and some H2)
• Effluent detritiation oxidizes all hydrogen isotopes to
water, recovers tritium from the water and exhausts the
detritiated gases.
• TBM Stream recovers T and other gases from TBM
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Tritium Plant commissioning schedule
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Comparison of ITER Fuel Cycle to DEMO
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Generic overview of fusion fuel cycle mass and energy flows
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Current and planned key fusion tritium fuel
cycle development points
State-of-the-art
Fusion power: 10’s MW
Burn fraction: Nil
Pulse length: seconds
Annual duty cycle: ~5%
Breeding: None
ITER/ITER-TBM
Fusion power: 500 MW
Burn fraction: 0.3%
Pulse length: 3000 s
Annual duty cycle: 5%
Breeding: TBM testing
DEMO
DEMO
Fusion power: 2000 MW
Burn fraction: >3%?
Pulse length: Continuous
Annual duty cycle: 50%
Breeding: Self-sufficient
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Distinguishing characteristics of ITER Tritium Plant systems
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Unique capabilities of interest to ITER (1/2)
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Unique capabilities of interest to ITER (2/2)
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Technologies for ITER Tritium Plant systems
Note: Most design information is at the preliminary design phase.
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TEP – Tokamak Exhaust Processing
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TEP Functions
• Separate hydrogen isotopes from impurities
• Separate helium from hydrogen isotopes/impurities (proposed req.)
• Recover tritium from impurities (e.g. Q2O and CQ4)
• Retain gamma emitters (e.g. 41Ar) to provide time for radioactive decay
• Perform process evacuation of high-tritium gas mixtures
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TEP process diagram
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TEP Technologies
Function Core Technology
Separate Hydrogen isotopes from
impurities
Permeators, cryogenic molecular sieve,
oxidation/adsorption
Separate helium from Hydrogen
isotopes/impurities Cryogenic molecular sieve
Recover Tritium from impurities Palladium Membrane Reactor,
Oxidation/adsorption
Gamma (41Ar) decay Tanks
Process evacuation Vacuum pumps
Internal TEP gas management function Manifolds, tanks
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Palladium membrane reactor
• Without generating solid waste, recover hydrogen isotopes from:
– Water
– Hydrocarbons
– Ammonia
• Successfully tested at ITER scale in lab
• Considering tests at JET
HTO
(Tritiated Water)
CO
CO, CO2
HT
Catalyst
Pd/Ag Membrane Reactor Shell
HTO + CO HT + CO2
Seven tube PMR before and after loading catalyst
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Permeators
• Well-proven to separate hydrogen isotopes (infinite separation factor)
• Available pumps are well-suited to 1/10th ITER scale applications, but not
to full ITER scale. While feasible, new pump development would be
welcome.
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ISS – Isotope Separation System
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ISS Functions
• Recover T from WDS H2 and return H2 to WDS
• Recover T from neutral beam D2 and HD, and return D2 to neutral beams
(through SDS)
• Separate torus DT exhaust into T2 and D2 and return to SDS/Fueling for
torus fueling
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ISS process diagram
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ISS Technologies
Function Core Technology
Recover T from WDS H2 and return H2 to WDS Distillation
Recover T from neutral beam D2 and HD, and return D2 to
neutral beams (through SDS)
Distillation
Separate torus DT exhaust into T2 and D2 and return to
SDS/Fuelling for torus fuelling
Distillation
Support for ISS functions Pumps, equilibrators
Refrigeration
Rupture disks, expansion tank
Raman spectroscopy (gas analysis)
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Cryogenic distillation
• Demonstrated at laboratory-scale with dynamic ITER-type loads (10th
ITER) and routinely in industrial applications (tritium recovery from heavy
water)
• Issues for ITER
– Tritium inventory
– Control under various and changing loads
– Single system serving three duties simultaneously
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SDS – Storage and Delivery System
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SDS Functions
• Recycle DT for torus fueling
• Recycle D2 for neutral beams
• Recycle gases for glow discharge cleaning
• Medium-term storage of D and T
• Long-term storage of T
• Supply non-tritium gases to the Fuel Cycle
• Load-in/Load-out of T
• Q2 assay
• Collect 3He
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SDS process diagram
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SDS Technologies
Function Core Technology
Recycle gases for torus fuelling Transfer pumps, buffer tanks
Recycle Q2 for neutral beam
heating
Transfer pumps, buffer tanks, metal-hydride
beds
Recycle gases for glow discharge
cleaning
Transfer pumps, buffer tanks
Store Q2 (Medium term) Metal-hydride beds
Store Tritium in the Tritium-depot Tritium transport beds, secure facility
Supply non-Tritium gases Gas cylinders, lines with back-flow prevention
Load-in/Load-out Tritium Materials handling equipment, load in/load out
station
Measure Q2 inventory Calorimetry, PVT-c
Collect 3He Purifier, collection tank
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Uranium hydride beds
• Used successfully to store hydrogen isotopes including tritium
• Store tritium at room temperature with negligible gas pressure, deliver
hydrogen isotopes at 400 – 500 C.
• Generates gas pressure with no moving parts
• Tested with tritium at ITER scale
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DS – Detritiation System
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DS Functions
• Provide reduced pressure in rooms and enclosures (radioactivity
confinement-related )
• Perform detritiation of room atmospheres
• Perform detritiation of process gases
• Perform enclosure (incl. glovebox) atmosphere detritiation
• Perform torus detritiation
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DS process diagram
• Multiple oxidation/adsorption trains are used to serve an extensive list of
clients
– Processes
– Gloveboxes and other enclosures
– Port Cell and Neutral Beam Cell atmosphere
– Rooms
– Vacuum vessel over pressure venting
– Elephant trunks
Tritium Oxidation
Tritiated gases from sources (processes,
enclosures, rooms)
TM1
Tritium Collection
TM2
Detritiated gases to Stack
Oxidize all tritium to water
Collect tritium using molecular sieve or scrubber
columnTM = Tritium Monitors
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DS Technologies
Function Technology
Provide reduced pressure
Rooms Blowers
Enclosures Blowers
Perform gas detritiation
Room atmosphere Oxidation, Scrubber Column
Enclosure atmosphere Oxidation, molecular sieve (or scrubber column)
Elephant trunk Oxidation, molecular sieve (or scrubber column)
Process gas Oxidation, molecular sieve (or scrubber column)
Torus Oxidation, molecular sieve (or scrubber column)
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Scrubber Column technology is being deployed for tritiated water
collection
• Counter-current contactor between tritiated gas and clean water
• Completed pilot-scale technology validation
Two sections of “single” scrubber column (2.8 m combined length)
Perevezentsev, A., et al, Wet scrubber column for air
detritiation, Fusion Science and Technology, 56, 1455-1461
(2009).
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Scrubber Technology Validation Completed
• Completed R&D at three sites including pilot-scale testing with tritium
• Developed mathematical model and correlated results
• Used model to predict performance of
ITER-scale scrubber column and show
that requirements are met
• ITER system can produce tritiated
less water than traditional system
with same detritiation performance
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
0 200 400 600 800 1000 1200 1400 1600
DF
G (Nm3/h)
l=1.0
l=0.95
l=0.90
In the low flow region, L is not reduced below a minimum level to maintain sufficient DF
Gas Feed Rate (Nm3/h)
Detr
itia
tio
n F
acto
r
l = Clean water feed rate
Tritiated water vapor feed rate
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The Tokamak Complex DS is a large industrial system
Scrubber columns, 8 each (11 m tall)
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WDS – Water Detritiation System
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WDS Functions
• Recover tritium from moderately tritiated water
• Release protium (and deuterium) to the environment
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WDS process diagram
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WDS Technologies
Function Core technology
Admission and storage of
tritiated water Water holding tanks
Chemical purification of feed-
waters
Filtration, ion-exchange resin, adsorption of
impurities by solid adsorbent
Production of gaseous Hydrogen Electrolysis of water
Chemical purification of gaseous
Hydrogen for delivery to ISS
Hydrogen permeation through palladium-alloy
membranes
Detritiation of gaseous
Hydrogen
Liquid phase catalytic exchange between
gaseous Hydrogen and liquid water
Hydrogen discharge to the
atmosphere1
Mixing with air to Hydrogen concentration below
4vol.%, prevention of fire backwards
propagation
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WDS water storage tanks are the first processing components
installed in the Tokamak Complex
20 m3 tank installed with tokamak
ring in background
100 m3 tank swinging into position
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ITER UID: THR7JS
ANS – Analytical System
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ANS Functions
• Perform gas chemical analysis for hydrogen isotope inventory
determination
• Perform gas chemical analysis for process gas characterization
• Support analytical capabilities included within Tritium Plant systems
• Determine tritium content of liquids
• Determine tritium content of solids
• Perform chemical analysis for special samples
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ITER UID: THR7JS
ANS process diagram
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ITER UID: THR7JS
ANS Technologies
Functions Analytical technologies
Security Laser Raman Spectrometer (LRS), Gas Chromatograph (GC)
Safety LRS, GC (micro Gas Chromatograph)
Operations LRS with fiber connection to KMPs
Gas acceptance testing GC including GC
Operational
monitoring/diagnosis
GC including GC, QMS
Verification LRS, GC including GC, Quadrupole Mass Spectrometer (QMS)
Calibration (Calibration strategies)
HDO and D2O Fourier Transform- Infrared spectrometer (FT-IR), Liquid Scintillation
Counter (LSC)
Solids Thermal Desorption Spectrometer (TDS), LSC, Open-wall ionization
chamber, Tritium contamination detectors like open-wall ionization
chamber
Special samples Instruments in current plant, future instruments
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Fuel Cycle Modeling
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ITER UID: THR7JS
0
0.2
0.4
0.6
0.8
1
83736353433323133
Mo
le F
racti
on
Stage number from bottom to top
HH1
HD2
HT3
DD4
DT5
TT6
HH exp
HD exp
HT exp
DD ext
DT exp
TT exp
Feed Tray
Time-dependent Fuel Cycle system modeling
• Commercially available chemical engineering software (Aspen)
adapted to tritium system modeling. Highlights include:
– Cryogenic distillation
– Flow and composition determination throughout cycle
0
50
100
150
200
250
0 10 20 30 40 50 60 70 80 90 100
D2
, D
T a
nd
T2
flo
wra
tes
(Pa
m3
/s)
Time (min)
Torus Feed (Flat)
TEP Feed (waves)
DT
T2, D2(lines on top ofeach other)
DT
D2
T2
Torus feed (ramp up/flat top/ramp down) becomes
highly variable feed following cryogenic pumping
and regeneration Cryogenic distillation column concentration profile
matches favorably with experiments
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ITER UID: THR7JS
Gap analysis to DEMO
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Tritium technology gap analysis major themes
• Tritium purification and recycle
– Proof-of-concept work has been performed, but now this must progress to the
next level. ITER will make significant contributions.
– New technologies will be needed due to impractical scale-ups and to
accommodate tritium breeding.
• Safety
– Scaling containment/detritiation systems to the next level is proving difficult
and expensive.
– Containment in the extreme DT fusion environment will reveal issues that
must be addressed.
• Tritium breeding and extraction
– Fundamental experiments are needed.
– No proof-of-concept experiments have been performed. Full experiments will
require neutron irradiation.
– ITER TBM is planned and complimentary work is needed
– A large body of work will be required to field a functioning, full breeder blanket
on DEMO or pre-DEMO experiments
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ITER UID: THR7JS
ITER TBM
Mission:
Test, understand and develop prototype blanket systems (tritium
breeder/tritium extraction) in a realistic fusion environment. Together with
TBEF, qualify blanket systems for FNSF.
Approach:
Neutron irradiate multiple, inexpensive (“suitcase”) sized blanket modules
and extract resulting tritium in realistic fusion environment
49
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ITER Test Blanket Module (ITER-TBM)
System characteristics
• Operate in extended burn and dwell with daily interruptions for 6 days
• Include tritium containment systems
• Large ITER tritium inventory and small TBM inventory
Sub-system characteristics
• 14 MeV source • Varying neutron flux
• Small modules (~1 m2) • Realistic fusion
environment • Must consider non-TBM
interactions
• Modules changeable during maintenance periods
• Include tritium
extraction and heat extraction technology
• Technology changeable during maintenance periods
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Tritium Breeding and Extraction Facility (TBEF)
Mission:
Test, understand and develop prototype integrated blanket systems
(neutrons/breeding/tritium extraction) in a controlled, scalable, easily-
configured environment. Together with ITER-TBM, qualify blanket systems
for FNSF.
Approach:
Neutron irradiate multiple, inexpensive (“suitcase”) sized blanket modules
and extract resulting tritium in controlled, easily-configurable environment
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Tritium Breeding and Extraction Facility (TBEF)
System characteristics
• Operate continuously until steady state achieved (1-4 wks)
• Include tritium containment systems
• Relatively small tritium inventory
Sub-system characteristics
• Not necessary to be 14 MeV source
• Controlled neutron flux
• Small modules, but large enough to display system behavior (~1 m2)
• Modules readily
changeable • Controlled
temperature/heat input
• Include tritium
extraction and heat extraction technology
• Technology readily changeable
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Fuel Cycle Development Facility (FCDF)
Mission:
Test and develop technologies in an integrated fusion fuel cycle configuration
in support of TBEF, FNSF and ITER as well as meet other needs such staff
development.
Approach:
Test new technologies and new configurations in an H and D (not T)
integrated fusion fuel cycle facility. Develop, demonstrate and optimize
system performance.
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Fuel Cycle Development Facility (FCDF)
System characteristics
• Include all purification/recycle and extraction sub-systems
• Constructed at approximate 1/5th DEMO scale
• Used to develop sub-systems as well as the overall system
• Conducive to low-cost technology development since
• Not directly tied to support machine operations (ITER or FNSF)
• Not operating with tritium
• Test safety systems without risking actual tritium release
• Can test beyond performance extremes (not tied to operating machine)
• Generate reliability
• Use for staff training
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Conclusions
• The ITER Tritium Plant design and construction is a major undertaking
• Feasible technologies for each function have been identified
• Lessons being learned on ITER will be valuable for DEMO
• There is still tritium technology work beyond ITER that is needed to
advance to DEMO.