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Transcript of Www.inl.gov Thermal Design and Analysis of Capsule Experiments in the ATR Paul Murray ATR Experiment...
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Thermal Design and Analysis of Capsule Experiments in the ATR
Paul MurrayATR Experiment Design and AnalysisIdaho National Laboratory
NSUF User Meeting
June 22, 2015
Temperature Indications and Comparison to Simulation
2
Contents• Introduction – static and active temperature control• EPRI static capsule experiment
– Experiment design– Temperature indicators (melt wires and SiC)– Reactor power history– Melt wire temperature indications– SiC temperature indications– Heat transfer simulations– Irradiation temperature estimates
• UCSB lead-out capsule experiment– Experiment design– Heat transfer simulations– Temperature measurements
ATR core cross-section
EPRI experiment
UCSB experiment
Capsule experiments• A gas gap of known thermal resistance is used to attain the desired
specimen temperature• Gas gap temperature controlled capsule experiments
– Static capsule experiment with fixed temperature control gas– Lead-out experiment with variable temperature control gas
Pressure tube
Helium/argon/neon gas gap
SpecimensSpecimen holder
Reactor coolant 50°C, 360 psig
5
EPRI static capsule experiment
• Capsule containing zirconium alloy specimens is irradiated in the A-16 position in the ATR northwest lobe
• Experiment is designed to study irradiation induced growth of zirconium alloys
6
Experiment design• 50 specimens (10 stacks of 5) are contained in a helium-filled
pressure-retaining stainless steel capsule• Gas gap temperature control is designed to maintain specimen
temperature at 285ºC ±10ºC
Spacer
Specimens
Holder
Capsule
7
Temperature indicators• Six melt wires (labelled A – E) and two SiC rods (labelled F) located in
dowel holes at top and bottom of specimen holder
Melt wire label
Location of melt wire in specimen holder
Composition of melt wire
Melting temperature
A Top Right 100% Sn 231.8°CD Top Right 80% Au 20% Sn 279.5°CC Top Left 90% Pb 10% Sb 252.4°CB Bottom Right 95% Sn 5% Sb 238.6°CE Bottom Right 90% Pb 5% Ag 5% Sn 302.9°CC Bottom Left 90% Pb 10% Sb 252.4°C
F
C
C
F
B
E
D
A
Top
Bottom
Dowel holes
Capsule
Holder
Specimens
8
Temperature indicators• Melt wires are encapsulated in helium-filled quartz tubes; post-
irradiation visual inspection is used to determine if melting occurred• Measured change in SiC electrical resistance resulting from post-
irradiation annealing is used to estimate irradiation temperature
Interior of annealing furnace
Apparatus for resistance measurement
SiC
9
Reactor power history
Cycle Average Lobe Power (MW) EFPD
149A 18.0 37149B 18.0 54150B 18.0 42151A 18.9 60151B 18.9 56152B 18.9 52
• SiC indicates temperature corresponding to average power during the final irradiation cycle
• Melt wire indicates temperature corresponding to peak power during the irradiation
10
Reactor power history
11/27/2
012
12/5/2
012
12/13/2
012
12/21/2
012
12/29/2
012
1/6/2
013
1/14/2
013
1/22/2
01318.5
18.6
18.7
18.8
18.9
19
19.1
19.2
19.3
19.4
19.5Cycle 152B NW Lobe Power
Date
Pow
er (M
W)
19.44 MW
• Peak lobe power 19.44 MW occurred during cycle 152B on 12/06/2012
11
Melt wire temperature indications• All melt wires at top of holder showed clear indications of melting• Peak irradiation temperature at top of the holder is equal to or
greater than 279.5°C (melting temperature of 80 Au 20 Sn)
Composition of melt wire
Melting temperature
Melted during irradiation
100% Sn 231.8°C Yes80% Au 20% Sn 279.5°C Yes90% Pb 10% Sb 252.4°C Yes95% Sn 5% Sb 238.6°C Yes90% Pb 5% Ag 5% Sn 302.9°C No90% Pb 10% Sb 252.4°C Yes
Sn80Au 20Sn
12
Melt wire temperature indications• One melt wire (90 Pb 5 Ag 5 Sn) at bottom of holder did not melt;
other wires showed clear indications of melting• Peak irradiation temperature at bottom of holder is less than
302.9°C (melting temperature of 90 Pb 5 Ag 5 Sn)
Composition of melt wire
Melting temperature
Melted during irradiation
100% Sn 231.8°C Yes80% Au 20% Sn 279.5°C Yes90% Pb 10% Sb 252.4°C Yes95% Sn 5% Sb 238.6°C Yes90% Pb 5% Ag 5% Sn 302.9°C No90% Pb 10% Sb 252.4°C Yes
90Pb 5Ag 5Sn 95Sn 5Sb
13
SiC temperature indications• Indicated irradiation temperature at top of holder is 258°C ±10°C
14
SiC temperature indications• Indicated irradiation temperature at bottom of holder is 279°C ±10°C
15
Heat transfer simulation at 18.9 MW
16
Heat transfer simulation at 19.4 MW
17
Temperature indications and results of simulation
Reactor Lobe Power
Indicated Irradiation
Temperature of SiC
Indicated Irradiation
Temperature of Melt Wires
Calculated Irradiation
Temperature of SiC
Calculated Irradiation
Temperature of Melt Wires
Calculated Irradiation
Temperature of Specimens
18.0 MW 275°C - 291°C
18.9 MW
258°C ± 10°C (top)
279°C ± 10°C (bottom)
261°C - 269°C (top)
266°C - 271°C (bottom)
284°C - 301°C
19.4 MW> 279.5°C (top)
< 302.9°C (bottom)
277°C (top)279°C
(bottom)290°C - 307°C
18
Irradiation temperature estimates
Cycle Average Lobe Power (MW)
Estimated Irradiation
Temperature149A 18.0 275°C - 291°C149B 18.0 275°C - 291°C150B 18.0 275°C - 291°C151A 18.9 284°C - 301°C151B 18.9 284°C - 301°C152B 18.9 284°C - 301°C
UCSB lead-out capsule experiment
• Capsule containing low alloy carbon steel specimens is irradiated in the I-22 position in the ATR southeast lobe
• Capsule is instrumented with 28 thermocouples• Active gas gap temperature control using helium-argon control gas
is designed to maintain specimen temperature at 250°C to 310°C
Experiment design• Numerous multi-purpose disc specimens, compact tension specimens,
and tensile specimens contained in a thin-walled sleeve• Thermocouples and gas lines located in a sealing tube assembly that
contains the specimen packets • Helium-argon control gas mixture is adjusted based on temperature
feedback from thermocouples
Gas lines and TCs
Sealing tube assemblySpecimens
Sleeve
Experiment design• Specimens arranged in packets according to desired irradiation
temperature• Three gas zones with variable gas gaps• Selected thermocouples in each zone used for temperature control
Bottom zone Top zoneMiddle zone
Heat transfer simulation
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2850
100
150
200
250
300
350
Specimen
Thermocouple
Thermocouple Number
Te
mp
era
ture
(d
eg
ree
s C
)
• Simulation using a 50% He – 50% Ar control gas mixture used to establish thermocouple setpoints at approximately 276°C
Control TCs
Heat transfer simulation• Simulation using actual control gas mixture on 6/20/2011
(bottom zone 42% He, middle zone 62% He, top zone 48% He)
Temperature measurements
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2850
100
150
200
250
300
350
Measured
Calculated
Thermocouple Number
Te
mp
era
ture
(d
eg
ree
s C
)
• Simulation using actual control gas mixture during irradiation
Temperature measurements• Error bars correspond to ±0.002 inch uncertainty in gas gaps
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2850
100
150
200
250
300
350
Measured
Calculated
Thermocouple Number
Te
mp
era
ture
(d
eg
ree
s C
)
Summary• EPRI static capsule experiment
– Passive temperature indication• UCSB lead-out experiment
– Active temperature indication• Comparison of temperature indications to heat transfer simulations
– Temperature uncertainty is approximately ±30°C for a materials irradiation at 300°C