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OECD/NRC BWR Peach Bottom-2 Turbine Trip Benchmark – 2 nd Workshop, Villigen,October 2001 PowerPoint Presentation
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PAUL SCHERRER INSTITUT. PB2 TTRIP Phase 2 Coupled 3D Kinetics/Core Thermal-Hydraulic BC Analysis with CORETRAN. H. Ferroukhi, W. Barten, P.Coddington. OECD/NRC BWR Peach Bottom-2 Turbine Trip Benchmark – 2 nd Workshop, Villigen,October 2001 . PAUL SCHERRER INSTITUT. CONTENTS.

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slide1

PAUL SCHERRER INSTITUT

PB2 TTRIP Phase 2

Coupled 3D Kinetics/Core Thermal-Hydraulic BC

Analysis with CORETRAN

H. Ferroukhi, W. Barten, P.Coddington

OECD/NRC BWR Peach Bottom-2 Turbine Trip Benchmark – 2nd Workshop, Villigen,October 2001

contents

PAUL SCHERRER INSTITUT

CONTENTS
  • CORETRAN and RETRAN-3D at PSI
  • PB2 TTRIP Phase 2: 3-D Kinetics with Core T/H Boundary Conditions
  • Steady-State Results
  • Transient Results
  • Summary
slide3

CORETRAN

  • 2 Group, 3-D
  • Core Static Depletion and Transients
  • Neutronics
    • ARROTTA (ANM)
    • ANM-NEM /CMFD
  • Thermal-Hydraulics
    • VIPRE-02
      • Stand Alone Sub- Channel Analyses
    • 3 Eq. HEM to 6 Eq.
  • RETRAN-3D
  • 2 Group, 3-D
  • Core and Plant System Transients
  • Neutronics
    • ARROTTA (ANM)
    • ANM-NEM /CMFD
  • RETRAN Thermal-Hydraulics
    • 3 Eq., 4 Eq., 5 Eq.

PAUL SCHERRER INSTITUT

CORETRAN and RETRAN-3D at PSI

  • PSI transient code environment with CORETRAN / RETRAN-3D
slide4

PAUL SCHERRER INSTITUT

PB-2 Phase 2: Objectives at PSI

  • ANALYSIS WITH CORETRAN: Coupled 3-D Kinetics/Core Thermal-Hydraulic BC Model
    • Steady-state at both TT2 Conditions and HZP
    • Transient Analysis:
    • Analysis performed and submitted
  • ANALYSIS WITH RETRAN-3D: Coupled 3-D Kinetics/Core Thermal-Hydraulic BC Model
    • RETRAN-3D Model needs to be set-up for Phase 3 but can also be used for Phase 2
    • Model set-up based on CORETRAN
    • Lumped Model necessary in RETRAN-3D (Homogenized T/H Feedback Variables !)
    • Steady-State analysis at HZP to verify consistency in Neutronic Solution CORETRAN-RETRAN-3D
    • Steady-State and Transient Analysis at TT2 Conditions with 33-T/H Lumped Model
      • Assess differences between CORETRAN and RETRAN-3D
        • Influence of T/H solution and void model
        • Influence of T/H feedback homogenization
  • Analysis with RETRAN: 1-D Kinetics
    • Additional exercise if time available
    • Valuable to assess differences 1-D/3-D
slide5

PAUL SCHERRER INSTITUT

PB2 Phase 2: CORETRAN Model of PB2

  • ANM Neutronic Algorithm (ARROTTA)
  • 6 Equation 2 Fluid T/H Model (VIPRE-02)
  • Full Core Representation
    • 1x1 Neutronic and T/H Radial Mesh
  • Bypass = 1 Additional T/H Channel
    • No Bypass Void
  • Detector Model
  • X-S model modified
    • X-S tables read directly
    • Use of provided X-S interpolation routine
    • Xenon densities read as Restart file
  • No Decay Heat Model
slide6

PAUL SCHERRER INSTITUT

PB2 Phase 2: CORETRAN Steady-State Results

slide7

PAUL SCHERRER INSTITUT

Note on Spacer Void Model

  • Spacer Void Model (SVM) available in SIMULATE-3 to treat void accumulation at Spacer Grids
  • PSI Experience with Swiss BWRs shows very good agreement with TIP with the SVM
  • Assessment CORETRAN/SIMULATE performed at PSI for Swiss LWRs show that the SVM has a
    • Strong impact on the axial power shape in the boiling zone
    • Strong impact on the core reactivity (more negative void coefficient in boiling zone)
slide8

PAUL SCHERRER INSTITUT

PB2 Phase 2: CORETRAN Transient Results

  • Analysis 1: Boundary Condition = Total Core Flow versus Time
          • 6 Eq. + NBC
          • FIBWR Flow Split Model in quasi-static mode
          • Pressure-Flow Convergence Problems

Power and LPRM

Core Flow

Pressure

slide9

PAUL SCHERRER INSTITUT

PB2 Phase 2: CORETRAN Transient Results

  • Analysis 2: Boundary Condition = (33 T-H Channels) + ( Bypass Channel) Flow versus Time
          • No FIBWR Model

No Bypass Correction (Nominal)

With Bypass Correction (BC1)

slide10

PAUL SCHERRER INSTITUT

PB2 Phase 2: CORETRAN Transient Results

  • Sensitivity Studies: Boundary Condition = (33 T-H Channels) + ( Bypass Channel) Flow versus Time
          • Time Step Size
          • SCRAM Signal

Time Step Size

SCRAM Signal

slide11

PAUL SCHERRER INSTITUT

PB2 Phase 2: Summary

  • CORETRAN Model for PB-2 Exercise 2 Set-Up
  • Steady-State Analysis at TT2 Conditions
    • Good agreement with PB1 Edit
      • Axial Power Shape (Caution on spacer void)
      • Core Average Void Fraction, Average Exit Quality, Core Pressure Drop
    • Very High K-eff
  • Transient Results
    • Analysis with total ore flow BC + FIBWR flow split UNAPPLICABLE
    • Analysis with 33-TH Channel flow BC
      • No Bypass Correction gives slight under prediction of power peak (Nominal Case Submitted)
      • Later analysis with Bypass Correction shows better agreement with measurements
  • Sensitivity Analysis
    • Large sensitivity on time-step size
      • Small Time-Step size of 1ms selected
    • Choice of SCRAM on 95% power instead of defined t=0.63 s seems more adequate
      • but leads to earlier and lower power peak magnitude
  • Next Step is to perform similar analysis with RETRAN-3D before Phase 3
slide12

PAUL SCHERRER INSTITUT

PAUL SCHERRER INSTITUT

PB2 Phase 2: CORETRAN Bypass Model

  • CORETRAN PB2 Bypass Model
  • Defined Leakage Paths
    • Core Support Plate
    • Control Rod Drive Housing
    • Assembly Lateral Leakage
      • Path a: Through Lower Tie Plate Holes (9 in FIBWR)
      • Path b:between Channel Box and Lower Tie Plate (8 in FIBWR)
      • Path c:Water Rods
  • All Paths to ONE SINGLE BYPASS T/H CHANNEL
  • Bypass Geometry
    • Assumed Core Shroud Diameter
      • D_CS = 5.6 m (220.47 in)
      • Based on EPRI Report NP-563
    • Assumed Assembly Outer Pitch
      • P_OUT = 0.1365 m (5.37 in)
    • Bypass Flow Area = 7.5 m2 (11570 in2)

1

FIBWR Model

All Leakage Paths defined by Flow-Pressure Drop Correlations