Transcript Alexandrov Research Institute of Technology FEDERAL STATE UNITARY ENTERPRISE SOSNOVY BOR, RUSSIA

FEDERAL STATE UNITARY ENTERPRISE
Alexandrov Research Institute of Technology
SOSNOVY BOR, RUSSIA
SENSITIVITY ANALYSIS AND VERIFICATION
OF FUEL ROD MODEL
USED IN COUPLED NEUTRONIC
AND THERMAL-HYDRAULIC CODES
L.M. Artemova, V.G. Artemov, Y.P. Shemaev
Alexandrov Research Institute of Technology
Sosnovy Bor, Russia
SAPFIR_95&RC_VVER
program package
Fuel rod model considers:

― thermal expansion

― fuel swelling and cladding creep



― degradation of fuel thermal
conduction
― change of gap conductance
― asymmetric disposition of pellets
in fuel rod
Alexandrov Research Institute of Technoloqy
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Fuel diameter variation with burnup
(VVER-1000)
1.025
experiment
Relative change
1.02
1.015
calculation with
TRANSURANUS, 2006
1.01
1.005
calculation with
START-3, 2001
1
0.995
Burnup, MW·day/kg U
0.99
0
10
20
30
40
50
Alexandrov Research Institute of Technoloqy
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70
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Fuel rod diameter variation with burnup
(VVER-1000)
0
-0.01
experiment
-0.02
∆D, mm
-0.03
-0.04
calculation with
TRANSURANUS, 2006
-0.05
-0.06
-0.07
Burnup, MW·day/kg U
-0.08
0
10
20
30
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50
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Variation of fuel rod geometry with burnup
(RC models)
3.88
3.86
internal clad radius
Radius, mm
3.84
pellet radius:
model 3
(TRANSURANUS)
3.82
3.8
model 2
3.78
3.76
model 1
(START-3)
burnup, MW•day/kgU
3.74
0
10
20
30
40
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60
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Experiments at different burnup depth
3,88
internal clad radius
3,86
175 FPD
80 FPD
3,82
60 FPD
30 FPD
Radius, mm
3,84
3,80
3
3,78
pellet radius:
2
3,76
1
burnup, MW•day/kgU
3,74
0
2
4
6
8
10
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Axial xenon oscillations
5
100
0
90
-5
80
model 1
-10
70
-15
60
-20
50
models 2 and 3
-25
-30
30
ICH readings
experiment:
-35
40
20
control rod position
-40
10
time, h
-45
0
0
10
20
30
40
50
Alexandrov Research Institute of Technoloqy
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70
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control rod position, %
axial offset, %
(Rostov NPP, unit #1, 30 FPD)
Axial xenon oscillations
(Rostov NPP, unit #1, 60 FPD)
20
90
80
models 2 and 3
axial offset, %
70
0
60
-10
50
model 1
-20
40
30
-30
experiment:
-40
ICH readings
20
control rod positon
control rod position, %
10
10
time, h
-50
0
10
20
30
40
0
50
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70
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Spontaneous power reduction
(Rostov NPP, unit #1, 80 FPD)
100
95
experiment
90
85
power, %
ICH readings
restored values
model 1
80
75
70
65
models 2 and 3
60
55
time, h
50
0
1
2
3
4
5
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7
8
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Axial xenon oscillations
(Rostov NPP, unit #1, 80 FPD)
60
models 2 and 3
40
ICH readings
axial offset, %
20
0
model 1
-20
-40
time, h
-60
0
5
10
15
20
25
30
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40
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Axial xenon oscillations
(Zaporozhye NPP, unit #1, 175 FPD)
60
90
80
70
axial offset, %
model 3
20
60
50
0
model 1
40
model 2
-20
30
20
experiment
control rod position
-40
time, h
control rod position, %
40
10
-60
0
0
10
20
30
40
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60
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Weight function for calculation
of fuel effective temperature
 r   1 T r 
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Dependence of modeling results
on pellets disposition
100
95
experiment:
90
ICH readings
restored values
power, %
85
axially aligned pellets
80
75
70
max misaligned pellets
65
misaligned pellets
half-maximum effect
60
55
time, h
50
0
1
2
3
4
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6
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Fresh fuel conduction
Thermal conduction UO2, W/m·deg
9
VNIINM,1983
8
P. Lucuta,1996
7
W. Wiesenack, 1997
6
5
4
3
2
1
Temperature, 0K
0
0
500
1000
1500
2000
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2500
3000
15
Spontaneous power reduction
(Rostov NPP, unit #1, 80 FPD)
100
95
ICH readings
experiment:
restored values
90
model 1
power, %
85
80
75
70
65
models 2 and 3
60
55
time, h
50
0
1
2
3
4
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6
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Conclusions:


Realistic evaluation of fuel temperature is
needed for transients modeling
Best agreement of modeling results with
experiment is provided with:
—model 3 (TRANSURANUS) of fuel
swelling and cladding creep
— fuel thermal conduction from
VNIINM data base
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THANK YOU !
Contacts:
Ludmila Artemova
Alexandrov Research Institute of Technology
Sosnovy Bor, Leningrad region, Russia
Tel. +7(81369) 60-619
e-mail:[email protected]
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