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OECD/NRC Boiling Water Reactor Peach Bottom 2 Turbine Trip Benchmark. ANALYSIS AND SENSITIVITY STUDIES OF EXERCISE 1 OF THE OECD/NRC BWR TT BENCHMARK. 2002 ANS Winter Meeting. Bedirhan Akdeniz and Kostadin Ivanov Pennsylvania State University.

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OECD/NRC Boiling Water Reactor

Peach Bottom 2 Turbine Trip Benchmark

ANALYSIS AND SENSITIVITY

STUDIES OF EXERCISE 1 OF THE OECD/NRC

BWR TT BENCHMARK

2002 ANS

Winter Meeting

Bedirhan Akdeniz

and

Kostadin Ivanov

Pennsylvania State University


Peach bottom 2 turbine trip benchmark outline
Peach Bottom 2 Turbine Trip Benchmark OUTLINE

2002 ANS Winter Meeting

. Introduction

. Objectives and Definitions

. Performed Studies

- Steady State Results

- Transient Results

- Sensitivity Studies Results

. Conclusions


Peach bottom 2 turbine trip benchmark introduction
Peach Bottom 2 Turbine Trip Benchmark INTRODUCTION

2002 ANS Winter Meeting

  • Recent progress in computer technology has made development of coupled system thermal-hydraulic and neutron kinetics code systems feasible.

  • The OECD/NRC BWR Turbine Trip Benchmark has attracted the participation of a significant number of companies and organizations from different countries

  • Benchmark team of PSU is responsible for authoring the specifications, coordinating the benchmark activities, answering participant questions, analyzing the solutions submitted by participants, providing reports and summarizing the results for each phase of the benchmark


Peach bottom 2 turbine trip benchmark objectives and definitions
Peach Bottom 2 Turbine Trip BenchmarkOBJECTIVES and DEFINITIONS

2002 ANS Winter Meeting

BWR Turbine Trip:

  • Begins with a sudden turbine stop valve closure and simulates the turbine trip transient

  • Coupling between core phenomena and system dynamics plays an important role

  • Available real plant experimental data makes this benchmark problem very valuable


Peach bottom 2 turbine trip benchmark objectives and definitions1
Peach Bottom 2 Turbine Trip Benchmark OBJECTIVES and DEFINITIONS

2002 ANS Winter Meeting

Purpose of Exercise 1:

  • to test the system thermal-hydraulics with fixed axial power profile

  • to initialise the participants’ system models

TRAC-BF1:

- Transient Reactor Analysis Code

- An advanced best-estimate computer program for BWR accident analysis


Peach bottom 2 turbine trip benchmark performed studies
Peach Bottom 2 Turbine Trip BenchmarkPERFORMED STUDIES

2002 ANS Winter Meeting

  • TRAC-BF1 model was developed for PBTT

  • After being sure that the model is reflecting the PBTT characteristics, steady state and transient studies were performed

  • The results were compared with RETRAN results and available measured dome pressure data

  • Sensitivity studies were performed for steam bypass flow and core by pass flow.


Peach bottom 2 turbine trip benchmark requested outputs
Peach Bottom 2 Turbine Trip Benchmark REQUESTED OUTPUTS

2002 ANS Winter Meeting

1- SEQUENCE OF EVENTS

3- TIME HISTORIES

  • Dome Pressure

  • Core Exit Pressure

  • Total Jet Pump flow

  • Turbine Bypass Flow

2- STEADY STATE

  • Core Inlet Enthalpy

  • Core Axial Pressure Drop

  • Core Average Axial Void Fraction Distribution


Peach bottom 2 turbine trip benchmark performed studies1
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

TRAC-BF1 Steady State Results

  • Steady state pressure drop, core inlet enthalpy and core average void fraction distribution are callculated as follows:

Inlet Enthalpy: 1209.1 kJ/kg

Pressure Drop: 137.6 kPa

Plant Reference Parameters:


Peach bottom 2 turbine trip benchmark performed studies2
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

TRAC-BF1 Steady State Results


Peach bottom 2 turbine trip benchmark performed studies3
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

TRAC-BF1 Transient Results


Peach bottom 2 turbine trip benchmark performed studies4
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

TRAC-BF1 Transient Results


Peach bottom 2 turbine trip benchmark performed studies5
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

TRAC-BF1 Transient Results


Peach bottom 2 turbine trip benchmark performed studies6
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

SEQUENCE of EVENTS

  • TSVC : Turbine Stop Valve Closed

  • BVBO : Bypass Valve Begins Opening

  • BFO : Bypass Full Open

  • DPIR : Dome Pressure Initial Response

  • CEPIR : Core Exit Pressure Initial Response


Peach bottom 2 turbine trip benchmark performed studies7
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

SENSITIVITY STUDIES

  • In order to determine the jet pump behavior correctly sensitivity study was performed for pressure drop characterisics

  • Different number of channels were used to test the system thermal-hydraulics. Although few of them is sufficient to simulate the Exercise 1, 33 core channels were used because of the Exercise 2 and 3.

  • Main steam bypass flow modeling was performed

  • Core bypass flow modeling was performed.

  • In this presentation main steam bypass flow and core bypass flow sensitivity results will ve presented.


Peach bottom 2 turbine trip benchmark performed studies8
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

SENSITIVITY STUDIES

Main Steam Bypass Flow Modeling:

Accurate modeling of the steam bypass system is going to assure that the

dynamic response of system pressure is well predicted.

important issues are:

- obtaining the steam bypass characteristics

- an accurate geometric representation


Peach bottom 2 turbine trip benchmark performed studies9
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

MAIN STEAM BYPASS FLOW SENSITIVITY STUDY


Peach bottom 2 turbine trip benchmark performed studies10
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

CORE BYPASS FLOW SENSITIVITY STUDIES

Bypass Channel Modellng:

Additional 2 bypass channels added

to 33 core channels in order to

represent core bypass flow.

Leak Path Flow Modeling:

Instead of additional bypass channels

TRAC-BF1 allows user to define

leakage flow from channel to vessel

component.

TRAC-BF1 1-Dimensional Vessel Model


Peach bottom 2 turbine trip benchmark performed studies11

Steady State Core Bypass Flow Sensitivity Results

Flow Rates

Bypass Channel Model

(kg/s)

Leak Path Model

(kg/s)

RETRAN

(kg/s)

Total Core

10445

11031

10445

Channels

9603

9530

9603

Bypass

842

1501

842

Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

CORE BYPASS FLOW SENSITIVITY STUDIES


Peach bottom 2 turbine trip benchmark performed studies12
Peach Bottom 2 Turbine Trip Benchmark PERFORMED STUDIES

2002 ANS Winter Meeting

CORE BYPASS FLOW SENSITIVITY STUDIES


Peach bottom 2 turbine trip benchmark conclusions
Peach Bottom 2 Turbine Trip BenchmarkCONCLUSIONS

2002 ANS Winter Meeting

For both steady state and transient simulations, TRAC-BF1 results are in very good agreement with measured data and RETRAN predictions.

The Results from sensitivity studies are helpful to analyze participants’ results for the 1st Benchmark Exercise.

It is also verified that TRAC-BF1 can represent the system thermalhydraulics at both steady state and transient conditions.


OECD/NRC Boiling Water Reactor Turbine Trip Benchmark

2002 ANS Winter Meeting

T H A N K Y O U

Bedirhan Akdeniz and Kostadin N. Ivanov

The Pennsylvania State University


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