VVER-1000 Coolant Transient Benchmark - OECD Nuclear Energy ...

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CFD RESULTS AND DISCUSSION Table 4.8: Comparison of loop-to-assembly temperature differences along the centreline of the zone of minimal mixing Code 8 18 29* Assembly # 41* 54 68* 82* Experiment 0.60 0.50 0.80 0.50 2.60 4.30 10.80 CEA 0.05 0.04 0.04 0.05 0.30 5.20 11.00 BUTE 0.15 0.05 0.15 0.65 2.15 5.05 09.45 EREC 0.03 0.06 0.14 0.37 1.15 3.91 10.39 FZD 0.75 0.95 1.35 1.95 3.15 5.85 10.05 FZK 0.02 0.02 0.00 0.30 1.20 3.50 7.8 ORNL 0.80 0.85 1.15 1.75 3.35 7.95 11.65 UNIPI 0.03 0.09 0.20 0.50 1.39 4.41 09.91 * Assembly with temperature measurement. Table 4.9: Comparison of loop-to-assembly temperature differences along the border between the perturbed sector #1 and the non-perturbed sector #4 Code 76 77 78* Assembly # 79* 80* 81 82* Experiment 10.35 10.63 10.60 10.40 10.70 10.71 10.80 CEA 12.40 12.60 12.65 12.66 12.29 12.35 11.00 BUTE 10.45 10.25 10.05 09.85 09.45 08.55 09.45 EREC 11.59 10.82 09.78 10.63 09.90 09.39 10.39 FZD 09.55 09.45 09.45 09.15 08.65 08.35 10.05 FZK 10.40 9.5 9.3 8.7 7.7 7.2 7.8 ORNL 11.55 10.35 09.05 08.15 08.05 10.85 11.65 UNIPI 09.01 08.86 08.77 08.55 08.28 08.07 09.91 * Assembly with temperature measurement. Table 4.10: Comparison of loop-to-assembly temperature differences along the border between the perturbed sector #1 and the non-perturbed sector #2 Code 14 23 33 Assembly # 44* 56* 69 82* Experiment 08.30 08.93 07.70 08.80 07.60 08.06 10.80 CEA 10.20 11.40 10.80 09.20 06.20 06.70 11.00 BUTE 11.05 10.95 10.75 10.15 09.45 08.35 09.45 EREC 11.91 11.60 11.10 10.36 09.87 10.24 10.39 FZD 11.85 11.75 11.55 11.25 10.35 09.55 10.05 FZK 10.90 10.40 9.5 8.8 7.7 7.0 7.8 ORNL 13.15 13.15 11.35 10.45 09.25 09.05 11.65 UNIPI 11.37 11.46 11.12 10.61 09.85 09.02 09.91 * Assembly with temperature measurement. 48 V1000CT-2: SUMMARY RESULTS OF EXERCISE 1 ON VESSEL MIXING SIMULATION – © OECD/NEA 2010
Temperature deviations, K Temperature deviations, K Figure 4.23: Comparison of the deviations of all computed core inlet temperatures from plant-estimated data (163 assemblies) 8 6 4 2 0 0 20 40 60 80 100 120 140 160 -2 -4 -6 -8 Assembly Assembly # CEA TRIO_U - TRIO_U (LES) EREC EREC-REMIX REMIX v.1.0 (k-ε) FZK CFX - CFX 5.7.1 5.7.1 (k-ε) (k-ε) FZD CFX - CFX 10 10.0 (SST) (SST) BUTE CFX -CFX-10.0 10 (SST) (SST) UNIPI CFX 10 (k-ε) CFD RESULTS AND DISCUSSION Table 4.11: Comparison of maximum and average deviations in assembly inlet temperatures 95 instrumented assemblies TRIO_U BUTE CFX 10 EREC REMIX FZD CFX 10 FZK CFX 5 ORNL FLUENT UNIPI CFX 10 Mean error (ME) 0.052 0.009 -0.036 0.237 -0.278 0.016 -0.071 Average in modulus error 0.575 0.549 -0.688 0.888 -0.598 0.852 -0.813 Maximum in modulus error 2.900 2.850 -4.163 4.550 -3.011 4.850 -3.560 Mean square error (MSE) 0.828 0.754 -1.573 2.197 -0.885 2.112 -1.734 163 instrumented assemblies TRIO_U BUTE CFX 10 EREC REMIX FZD CFX 10 FZK CFX 5 ORNL FLUENT UNIPI CFX 10 Mean error (ME) 0.130 0.106 -0.087 0.354 -0.178 0.405 -0.049 Average in modulus error 0.699 0.622 -0.810 0.979 -0.671 1.191 -0.898 Maximum in modulus error 3.210 3.050 -4.930 4.820 -4.130 -4.360 Mean square error (MSE) 1.101 0.927 -1.935 2.464 -1.066 5.940 -1.974 V1000CT-2: SUMMARY RESULTS OF EXERCISE 1 ON VESSEL MIXING SIMULATION – © OECD/NEA 2010 49
Page 1 and 2: Nuclear Science ISBN 978-92-64-9915
Page 3 and 4: Foreword FOREWORD The Nuclear Energ
Page 5 and 6: Table of contents TABLE OF CONTENTS
Page 7 and 8: List of tables LIST OF TABLES 1.1 L
Page 9 and 10: LIST OF FIGURES 4.34 CEA TRIO_U and
Page 11: List of abbreviations ANS American
Page 14 and 15: INTRODUCTION 1.2 Exercise 2 - Compu
Page 16 and 17: THE INVESTIGATED MIXING PROBLEM •
Page 18 and 19: THE INVESTIGATED MIXING PROBLEM Fig
Page 25 and 26: Chapter 3: Methodology of compariso
Page 27 and 28: Chapter 4: CFD results and discussi
Page 29 and 30: Temperature, K Temperature, K Figur
Page 31 and 32: CFD RESULTS AND DISCUSSION Figure 4
Page 33 and 34: 4.4.3 Radial distributions at the c
Page 35 and 36: Temperature, K Figure 4.4: Downcome
Page 37 and 38: Velocity at 5 800 mm (m/s) Figure 4
Page 41 and 42: Figure 4.10: EREC REMIX results - a
Page 43 and 44: Figure 4.14: FZK CFX 5 results - an
Page 45 and 46: Figure 4.18: BUTE CFX 10 results -
Page 47: Figure 4.22: Assembly-by-assembly c
Page 51 and 52: Temperature deviations, K Temperatu
Page 59: Velocity, m/s Velocity, m/s Figure
Page 62 and 63: COARSE MESH RESULTS 5.2 Final state
Page 64 and 65: COARSE MESH RESULTS Figure 5.53 sho
Page 66 and 67: CFD RESULTS AND DISCUSSION Table 5.
Page 68 and 69: COARSE MESH RESULTS Velocity at 5 8
Page 70 and 71: COARSE MESH RESULTS Figure 5.6: INR
Page 72 and 73: COARSE MESH RESULTS Figure 5.10: KU
Page 74 and 75: COARSE MESH RESULTS Figure 5.14: UN
Page 76 and 77: COARSE MESH RESULTS Figure 5.17: De
Page 78 and 79: COARSE MESH RESULTS Temperature dev
Page 88 and 89: COARSE MESH RESULTS Figure 5.40: As
Page 90 and 91: COARSE MESH RESULTS Temperature, K
Page 98 and 99:
COARSE MESH RESULTS Flow rate, kg/s
Page 101 and 102:
Chapter 6: Summary and conclusions
Page 103 and 104:
References REFERENCES ANSYS (2010a)
Page 105 and 106:
CFX 10 (FZK, FZD, BUTE, UNIPI) Appe
Page 107 and 108:
DESCRIPTION OF CFD CODES millions o
Page 109 and 110:
CATHARE2 (INRNE) Appendix B: Descri
Page 111:
DESCRIPTION OF SYSTEM CODES The rea
Page 114 and 115:
PARTICIPANT-PROVIDED COMPUTATION DE
Page 116 and 117:
Page 118 and 119:
Page 121 and 122:
Page 123 and 124:
INRNE (CATHARE 2.5) I. Vessel therm
Page 125 and 126:
PSU (TRACE) I. Vessel thermal-hydra
Page 127:
II. Core thermal-hydraulic model 1.
Page 130 and 131:
DEVIATIONS OF CFD COMPUTED-TO-EXPER
Page 132 and 133:
Page 134 and 135:
Page 137 and 138:
*89 1.00 *62 2.84 103 0.33 76 2.06
Page 139 and 140:
*89 -0.38 *62 3.46 103 -0.40 76 4.3
Page 141:
*89 -0.98 *62 7.73 103 -0.84 76 8.9
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