UNIVERSITÀ DI PISAUNIVERSITÀ DI PISAG

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Recent Applications of Recent Applications of RELAP5-3D at GRNSPGRELAP5-3D at GRNSPG

N.Muellner

2011 RELAP5 International User’s Group Seminar And Meeting

Salt Lake City, UT, July 25-28, 2011

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RELAP5 International User's Group Seminar and Meeting, Salt Lake City, UT, July 25-28, 2011

CONTENTS Introduction

Fast Data Access (HDF5 file format)

3DS Viewer

Conclusions

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Introduction CNA2 – Chapter 15 FSAR – one of the

main projects of GRNSPG 2007-2010

Relap5-3D main tool for analysis

Applications (incomplete list) Three different nodalizations for RCS 3D Neutronics Coupling to code modelling I&C

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The Atucha-2 NPPThe Atucha-2 NPP2 LOOPS 1 MCP, 1 UT SG each

1 PRZ

2160 MWth1958 + 203 (nom. mod. T), or2001 + 160 (max mod T) +14 from MCP

451 separated FC

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The Atucha-2 NPPThe Atucha-2 NPP

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83 NPPScenarios

THE BEPU PROCESSTHE POSTULATED INITIATING EVENTS (PIE)

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IntroductionRELAP5-3D – Calculation of Temperatures, Pressures, Mass flows etcMultiple Timesteps inside“Control-timestep”

DYNETZ – calculation ofSignals from Control System

Ovars:TemperaturesPressuresMassflows

Ivars:Valve postionsPumps on/offPRZ Heaters

& Spray

DRIVER-PROGRAM

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Introduction Results 2007-2011, apart from FSAR

Chapter 15 - data of several TB

2011 Activities – Qualification Consolidate data bases Visualization

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Fast Data Access & Quality Control

Need to organize data

HDF5 data format chosen Open format supported by plotting

software such as Tecplot User can determine data structure Possibility to save all data which are part

of one calculation in one file

Controls may be imposed when file is created

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Fast Data Access & Quality Control

HDF5 ideal for large data sets B-Tree (generalization of a binary search tree) Chunking may be enabled (file sensitive to size

of chunks) At the moment, we could reach a maximum time

of access of 1s (room for improvement)

HDF5 is used by (among others) NASA (climate and geographic data) DOE (Advanced Simulation and Computing

Program) Boeing

Open libraries available for reading/creating HDF5 files

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3D - Viewer Our ProEngineer Technical Drawings of

NPP can be exported into .3ds file format (format by Autodesk)

3ds file format can be read by open libraries, and is tuned to be displayed with OpenGL

OpenGL visualization

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3D Viewer Putting together

Fast data access HDF5 Our technical 3D drawings 3ds- OpenGL Libraries

3D Visualization of Relap5-3D results

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Conclusions Fast data access - HDF5

Fast access to large data files Common standard, supported by

commercial plotting – packages Possibility to define controls on data set

generation

3D Viewer Fast 3D Visualization using existing

drawings Use of open libraries, independent from OS