Nuclear Energy for New Europe 2009

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No: 218

Conference: Nuclear Energy for New Europe 2009

Title: Simulation of primary to secondary leak transient in VVER-1000

Theme: Thermal Hydraulics

Author(s): Eugenio Coscarelli, Alessandro Del Nevo, Francesco D'Auria

Contact : Eugenio Coscarelli

E-mail: e.coscarelli@ing.unipi.it

Address: University of Pisa, San Piero a Grado Nuclear Research Group (GRNSPG)
56122 Pisa

Country: Italy

The present paper deals with the assessment of CATHARE2 code against a primary to secondary leak transient conducted in the scaled facility PSB-VVER. It is an Integral Test Facility (ITF), full height, full pressure, low power and scaled 1:300, installed at the Electrogorsk Research and Engineering Centre, Russia. The experiment is the fourth out of five experiments part of the OECD/NEA PSB-VVER Project validation matrix. The objectives of the test are the investigation of the thermal-hydraulic (TH) response of the VVER-1000 primary system following a primary to secondary side accident and the availability of experimental data aimed at the validation of thermal-hydraulic codes. Indeed, the test was designed and executed to obtain the experimental data addressing a scenario and phenomena not covered by the OECD/NEA VVER validation matrix. The experiment is a “Primary to Secondary Side Leak” with a BRU-A failure (the valve remained open in fully position) in the SG connected with the broken loop. The calculations have been performed using CATHARE2V2.5_1, its accuracy has been evaluated by qualitative and quantitative analysis reported in the present document. The quantitative analysis has been performed adopting a method developed at University of Pisa, which has capabilities in quantifying the errors in code predictions related to the measured experimental signal; the Fast Fourier Transform (FFT) is used aiming to have an integral representation of the code calculation discrepancies (i.e. error between measured and calculated time trends) in the frequency domain.

No:	218
Conference:	Nuclear Energy for New Europe 2009
Title:	Simulation of primary to secondary leak transient in VVER-1000
Theme:	Thermal Hydraulics
Author(s):	Eugenio Coscarelli, Alessandro Del Nevo, Francesco D'Auria
Contact :	Eugenio Coscarelli
E-mail:	e.coscarelli@ing.unipi.it
Address:	University of Pisa, San Piero a Grado Nuclear Research Group (GRNSPG) 56122 Pisa
Country:	Italy

The present paper deals with the assessment of CATHARE2 code against a primary to secondary leak transient conducted in the scaled facility PSB-VVER. It is an Integral Test Facility (ITF), full height, full pressure, low power and scaled 1:300, installed at the Electrogorsk Research and Engineering Centre, Russia. The experiment is the fourth out of five experiments part of the OECD/NEA PSB-VVER Project validation matrix. The objectives of the test are the investigation of the thermal-hydraulic (TH) response of the VVER-1000 primary system following a primary to secondary side accident and the availability of experimental data aimed at the validation of thermal-hydraulic codes. Indeed, the test was designed and executed to obtain the experimental data addressing a scenario and phenomena not covered by the OECD/NEA VVER validation matrix. The experiment is a “Primary to Secondary Side Leak” with a BRU-A failure (the valve remained open in fully position) in the SG connected with the broken loop. The calculations have been performed using CATHARE2V2.5_1, its accuracy has been evaluated by qualitative and quantitative analysis reported in the present document. The quantitative analysis has been performed adopting a method developed at University of Pisa, which has capabilities in quantifying the errors in code predictions related to the measured experimental signal; the Fast Fourier Transform (FFT) is used aiming to have an integral representation of the code calculation discrepancies (i.e. error between measured and calculated time trends) in the frequency domain.