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Improvement of the Verification of Coupled Thermohydraulics/Neutron Kinetics Codes

 
Improvement of the Verification of Coupled Thermohydraulics/Neutron Kinetics Codes

Description

Beneficiary Organisation details
Main beneficiary:
State Office for Nuclear Safety (Czech Republic)
http://www.sujb.cz
Co-beneficiaries:
Nuclear Regulatory Agency (Bulgaria)
http://www.bnsa.bas.bg
Hungarian Atomic Energy Authority
http://www.haea.gov.hu
Nuclear Regulatory Authority of the Slovak Republic
http://www.ujd.gov.sk
Project Aims

  • Establishment of validation procedures for coupled codes;
  • Extension and qualification of a database for the validation of coupled codes;
  • Contribution to the validation of available coupled codes.

Project Results

  • Assessment of fuel-cell cross section data and data collection from experimental facilities have been fulfilled. Corresponding Technical Reports were completed;
  • The favoured VVER-440 transient to be applied for code validation was the "Drop of one turbine to house load level", measured in Loviisa-1 (Finland);
  • From the available VVER-1000 transients, the experiment "Turning off one of the two working feed water pumps", performed in Balakovo-4 (Russia), was selected;
  • Input decks were prepared for the different coupled codes to be validated against the measurements;
  • Good agreement was found in most cases between the results of neutronics codes calculations and the data measured in the respective reactor cores;
  • First coupled-codes calculations were performed with HEXTRAN-SMABRE and DYN3D-ATHLET for both reactors. The preliminary results showed that both codes are able to model the behaviour of the safety-relevant core and thermal-hydraulics plant parameters during a transient;
  • Coupled code calculations were performed for codes HEXTRAN-SMABRE (VTT), DYN3D-ATHLET (FZR, NRI, STCNRS, INRNE), BIPA8-ATHLET (KI) and KIKO3D-ATHLET (AEKI). The calculated results were compared with each other and with the measured data;
  • Reports produced were reviewed by GRS.

Further Information
Further information on the project results could be sought from the beneficiary organizations.


General Information

Title: 
Improvement of the Verification of Coupled Thermohydraulics/Neutron Kinetics Codes
Programme: 
PHARE
Budget year: 
1995
Countries: 
Bulgaria
Czech Republic
Hungary
Slovakia
Types of activities: 
Technical Support Organisations
NPP: 
Balakovo
Loviisa
Installation types: 
VVER-440/213 + 1000
Duration (months): 
215
Contractors: 
IAEA (International Atomic Energy Agency)
FZR (Forschungszentrum Rossendorf)
VTT (Technical Research Centre of Finland)
GRS (Gesellschaft fur Anlagen und Reaktorsicherheit)
Sub-contractors: 
AEKI,KI,INRNE,NRI,STCNRS
Status: 
Completed
Old reference: 
SRR1/95
Effective contract date: 
24/07/1997
Closure date: 
24/11/1999