Download - EUROTRANS – DM1
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
EUROTRANS – DM1
RELAP5 Model Evaluation with SIMMER-III Code and Preliminary
Transient Analysis for EFIT Reactor
WP5.1 Progress MeetingKTH / Stockholm, May 22-23, 2007
P. Meloni, G. Bandini, M. Polidori
FPN-FISNUC / Bologna
EFIT Transient Analysis by ENEA
Use of SIMMER-III code for in-vessel natural circulation assessment and DHR performance evaluation
RELAP5 model evaluation and revision based on SIMMER-III results
Preliminary transient analysis (PLOHS and ULOF) with revised RELAP5 model
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
EFIT Design and Parameters
Primary circuit layout from ANSALDO presentation at the last EUROTRANS - DM4 Technical Review Meeting (March 2007):
Reactor core with 3 fuel zones
4 primary pumps, 8 IHXs, 4 secondary loops
4 DHR units (3 out of 4 in operation in transient analysis)
Primary circuit parameters:
Active core thermal power = 379 MW (ENEA study)
Lead mass flowrate = 31850 kg/s
Core inlet / outlet temperature = 400 / 480 C
Total pressure drop = 43 kPa (core pressure drop = 36 kPa)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
Used Approach
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
SIMMER-III calculationPLOHS (beam trip at t = 0 s)
3 DHR in operation
Recirculation ratio at DHR outlet
RELAP5 calculationPLOHS (beam trip at t = 0 s)
3 DHR in operation
Comparison
Additional RELAP5 pressure drop coefficients to fit core and DHR natural circulation mass flow rates (SIMMER)
Comparison with ANSALDO data
RELAP5 revised model
Transient analysis with RELAP5
ULOF
PLOHS (beam and pump trip if aver. core out T > 500 C)
RELAP5 model evaluation and transient analysis
Comparison
ULOF with SIMMER-III
SIMMER-III Model of EFIT
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
2-D R-Z (36 x 35) Cylindrical model
Initial condition with stagnant lead and free level DH simulation
Harmonization with RELAP5 plant data and boundary conditions
No steam generator heat losses
3 out of 4 DHR units in operation (degraded conditions)
DHR heat removal based on constant oil temperature in secondary side (Tin = 405 C, Tout = 409 C)
SIMMER-III Results (Lead Temperature)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
SIMMER-III Results (Lead Temperature)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
SIMMER-III Results at 3600 s (Lead Velocities)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
Horizontal velocityVertical velocity
SIMMER-III ANSALDOResults at after 1 hourt = 3600 s: (P = 16 MW)
mC = 2740 kg/s
mD = 2983 kg/s 2985 Kg/s
TCi = 410.5 C
TCo = 449.1 C
TDi = 444.6 C 444 C
TDo = 407.0 C 407 C
Recirculation Ratio at DHR Outlet for RELAP5
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
y = mC (TDi - TDo)
(TCi - TDo)
x = y + mD - mC
y = 255 kg/s
Recirculation ratio at DHR outlet:x = 498 kg/s (17% of mD)
Simplified scheme of RELAP5 model
xy
mC
mD
TCi
TCo
TDo
TDi
TDi
TCi
TCo
TCi
TCo
SIMMER and RELAP5 Comparison at t = 3600 s
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
Parameter Unit SIMMER-III RELAP5
Core mass flow rate Kg/s 2740 3047
Core inlet temperature C 410.5 413.7
Core outlet temperature C 449.1 448.5
DHR mass flow rate (3 units) Kg/s 2983 3108
DHR inlet temperature C 444.6 442.7
DHR outlet temperature C 407.0 408.4
DHR removed power (3 units) MW 16.67 15.89
xy
mC
mD
TCi
TCo
TDo
TDi
TDi
TCi
TCo
TCi
TCo
Additional pressure drop coefficients in RELAP5 model to fit SIMMER-III results
RELAP5 (revised)
2737
410.5
449.2
2983
443.0
406.9
16.02
Code Result Comparison (Transient)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
Core mass flow rate and temperature
0
1000
2000
3000
4000
0 1000 2000 3000 4000 5000Time (s)
Flo
w r
ate
(kg
/s)
Core flow (simmer)
Core flow (relap5)
390
410
430
450
470
490
0 1000 2000 3000 4000 5000
Time (s)T
em
pe
ratu
re (
C)
Tcore in (simmer)
Tcore out (simmer)
Tcore in (relap5)
Tcore out (relap5)
Core inlet / outlet temperature
Core mass flow rate
After the initial transient (about 2000 s) the revised RELAP5 model fit very well the SIMMER-III results
Code Result Comparison (Transient)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
DHR mass flow rate and temperature
0
1000
2000
3000
4000
0 1000 2000 3000 4000 5000
Time (s)
Flo
w r
ate
(kg
/s)
DHR flow (simmer)
DHR flow (relap5)
390
400
410
420
430
440
450
0 1000 2000 3000 4000 5000
Time (s)T
em
pe
ratu
re (
C)
Tdhr in (simmer)
Tdhr out (simmer)
Tdhr in (relap5)
Tdhr out (relap5)
DHR mass flow rate
DHR inlet / outlet temperature
After the initial transient the revised RELAP5 model fit well the SIMMER-III results, and stable DHR operation is predicted by both codes
Code Result Comparison (Transient)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
Core decay power
and
DHR removed power
0
5
10
15
20
25
30
0 1000 2000 3000 4000 5000Time (s)
Po
we
r (M
W)
DHR power (simmer)
DHR power (relap5)
Decay power
Preliminary Transient Analysis with RELAP5
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1, WP1.5 Progress Meeting
Protected Loss of Heat Sink (PLOHS) at BOC with beam and pump trip when average outlet core temperature exceeds 500 C and DHR degraded conditions (3 out of 4)
Unprotected Loss of Flow (ULOF) at BOC with SGs full capacity and without reactivity feedback (constant core power)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
Maximum temperature
(°C)
Inner zone (Fax = 1.14)
Middle zone (Fax = 1.16)
Outer zone (Fax = 1.17)
Hot FA 1/42
Fr = 1.12
Average FA 41/42
Hot FA 1/66
Fr = 1.13
Average FA 65/66
Hot FA 1/72
Fr = 1.24
Average FA 71/72
Central fuel 1252 1151 1330 1215 1282 1091
Surface fuel 870 819 859 806 813 733
Internal clad 540 525 536 521 531 505
External clad 528 514 526 511 522 498
Lead 495 485 496 484 499 480
Parameter Inner zone
Middle zone
Outer zone
Reflector + by-pass
Total
Thermal power (MW) 96 142.3 140.5 0 (*) 378.8
Lead mass flow rate (kg/s) 7615 11330 11805 1106 31856
Nominal Conditions (RELAP5 steady-state)
(*) about 5 MW (not considered in this study)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
PLOHS Transient Results (Relap5)
Core and DHR mass flow rate
Initial transient
About 3 hours transient
0
5000
10000
15000
20000
25000
30000
35000
0 100 200 300 400 500
Time (s)
Flo
w r
ate
(kg
/s)
Core flow
DHR flow
0
1000
2000
3000
4000
5000
6000
0 2000 4000 6000 8000 10000
Time (s)F
low
ra
te (
kg/s
)
Core flow
DHR flow
Proton beam and pump trip is assumed at 73 s (average lead temperature at core outlet > 500 K)
After some initial oscillations (free levels movements) both core and DHR mass flow rates became stable
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
PLOHS Transient Results (Relap5)
Core and DHR power
Initial transient
About 3 hours transient
0
5
10
15
20
25
30
0 2000 4000 6000 8000 10000
Time (s)P
ow
er
(MW
)
Core power
DHR power
0
50
100
150
200
250
300
350
400
0 200 400 600 800 1000
Time (s)
Po
we
r (M
W)
Core power
DHR power
The DHR system reaches full operation after about 600 s
A maximum of 20 MW power can be removed by 3 DHR units in operation)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
PLOHS Transient Results (Relap5)
Max lead and clad temperature
Initial transient
About 3 hours transient
420
450
480
510
540
570
600
0 2000 4000 6000 8000 10000
Time (s)T
em
pe
ratu
re (
C)
Tlead (inner_hot)
Tclad (inner_hot)
420
450
480
510
540
570
600
0 100 200 300 400 500
Time (s)
Te
mp
era
ture
(C
)
Tlead (inner_hot)
Tclad (inner_hot)
Peak clad temperature reaches 585 C in the hot channel of inner core zone
Max lead and clad temperature stabilize at about 450 C after 6000 s
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
PLOHS Transient Results (Relap5)
Max fuel temperature (hot channel)
Initial transient
400
600
800
1000
1200
1400
0 100 200 300 400 500
Time (s)
Te
mp
era
ture
(C
)
Tfuel (inner_hot)
Tfuel (middle_hot)
Tfuel (outer_hot)
400
600
800
1000
1200
1400
0 2000 4000 6000 8000 10000
Time (s)
Te
mp
era
ture
(C
)
Tfuel (inner_hot)
Tfuel (middle_hot)
Tfuel (outer_hot)
About 3 hours transient
380
400
420
440
460
480
0 2000 4000 6000 8000 10000
Time (s)T
em
pe
ratu
re (
C)
Vessel temp1
Vessel temp2
Vessel temp3
Max vessel wall temperature
The vessel wall temperature reaches a maximum of about 460 C after 3000 s and reduces below 440 s after 10000 s
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF Transient Results (Relap5)
0.0
0.2
0.4
0.6
0.8
1.0
-100 0 100 200 300 400 500
Time (s)F
ract
ion
(M
/Mo
)
Core flow
Core and SG exchanged power
Core mass flow rate
Core mass flow rate and power
0
100
200
300
400
500
-100 0 100 200 300 400 500
Time (s)
Po
we
r (M
W)
Core power
SG power
All primary pumps stop at 0 s (no pump inertia), secondary loops at nominal conditions
Core mass flow rate stabilizes at about 37% of the nominal value
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF Transient Results (Relap5)
Max lead temperature (top of active zone)
Average channel temperature
Hot channel temperature
450
550
650
750
850
-100 0 100 200 300 400 500
Time (s)
Te
mp
era
ture
(C
)
Tlead (inner_ave)
Tlead (middle_ave)
Tlead (outer_ave)
450
550
650
750
850
-100 0 100 200 300 400 500
Time (s)T
em
pe
ratu
re (
C)
Tlead (inner_hot)
Tlead (middle_hot)
Tlead (outer_hot)
Peak lead temperature reaches about 850 C in the hot channel of inner core zone just after pump stop
Max lead temperature stabilizes at about 625 C in the hot channel of outer core zone
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF Transient Results (Relap5)
Max clad temperature (top of active zone)
Average channel temperature
Hot channel temperature
500
600
700
800
900
-100 0 100 200 300 400 500
Time (s)T
em
pe
ratu
re (
C)
Tclad (inner_hot)
Tclad (middle_hot)
Tclad (outer_hot)
500
600
700
800
900
-100 0 100 200 300 400 500Time (s)
Te
mp
era
ture
(C
)
Tclad (inner_ave)
Tclad (middle_ave)
Tclad (outer_ave)
Peak clad temperature reaches about 870 C in the hot channel of inner core zone just after pump stop
Max clad temperature stabilizes at about 660 C in the hot channel of inner core zone
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF Transient Results (Relap5)
Max fuel temperature (centre of active zone)
Average channel temperature
Hot channel temperature
1000
1100
1200
1300
1400
1500
1600
-100 0 100 200 300 400 500
Time (s)T
em
pe
ratu
re (
C)
Tfuel (inner_hot)
Tfuel (middle_hot)
Tfuel (outer_hot)
1000
1100
1200
1300
1400
1500
1600
-100 0 100 200 300 400 500
Time (s)
Te
mp
era
ture
(C
)
Tfuel (inner_hot)
Tfuel (middle_hot)
Tfuel (outer_hot)
Peak fuel temperature reaches about 1525 C in the hot channel of middle core zone just after pump stop
Max fuel temperature stabilizes at about 1405 C in the hot channel of middle core zone
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF with SIMMER-III (Lead Temperature)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF with SIMMER-III (Lead Temperature)
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF with SIMMER-III at 1000 s (Lead Velocities)
Horizontal velocityVertical velocity
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
ULOF: SIMMER-III – RELAP5 Comparison
Core mass flow rate and temperature
Core inlet / outlet temperature
Core mass flow rate
0.0
0.2
0.4
0.6
0.8
1.0
0 100 200 300 400 500
Time (s)
Fra
ctio
n (
M/M
o)
Core flow (simmer)
Core flow (relap5)
350
450
550
650
750
850
0 100 200 300 400 500
Time (s)T
em
pe
ratu
re (
C)
Tcore in (simmer)
Tcore out (simmer)
Tcore in (relap5)
Tcore out (relap5)
SG tube temperature in SIMMER-III calculation is imposed according to RELAP5 results
After the initial transient (about 200 s) there is a good agreement in code results
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
ENTE PERLE NUOVE TECNOLOGIE,L’ENERGIA E L ’AMBIENTE
KTH – Stockholm, May 22 – 23, EUROTRANS – DM1 – WP1.5 Progress Meeting
Use of SIMMER-IV (3-D Calculation)
In progress(Convergence and CPU time problems still to be solved)
A A
BB
SectionA - A
SectionB - B