IBLOCA Analysis for Vandellòs-NPP Using RELAP5/MOD3.3. Sensitivity Calculations to EOP Actions (NUREG/IA-0497)

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Publication Information

Manuscript Completed: January 2018
Date Published: February 2019

Prepared by:
M. Pérez-Ferrgut, J. Freixa, F. Reventós and I. Sol

Department of Physics
Universitat Politècnica de Catalunya
ETSEIB, Av. Diagonal 647, Pav. C
08028 Barcelona

Kirk Tien, NRC Project Manager

Division of Systems Analysis
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
Under the Thermal-Hydraulic Code Applications and Maintenance Program (CAMP)

Published by:
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Availability Notice


This report analyzes the effect of the plant specific EOPs for the RCPs during a hypothetical IBLOCA in Vandellòs II NPP, a 3 loop Westinghouse design reactor. The scenarios simulated are:

  • Cold leg IBLOCA simulating the rupture of an accumulators connection to the RCS;
  • Hot leg IBLOCA simulating the rupture of the pressurizer surge line connection to the RCS.

The selection of an intermediate break size conforms to the risk-informed approach for the assessment of the ECCS performance.

The RELAP5/MOD3.3 model of Vandellòs II NPP was developed by the Advanced Nuclear Technologies (ANT) group at the Universitat Politècnica de Catalunya (UPC).

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