Assessment of TRACE5.0 Code Against ATLAS Test A5.2. Counterpart Test to LSTF (NUREG/IA-0540)

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Publication Information

Manuscript Completed: January 2023
Date Published: August 2023

Prepared by:
M.Lorduy, S. Gallardo and G. Verdú

Universitat Politècnica de València
Instituto Universitario de Seguridad Industrial, Radiofísica y Medioambiental
Camí de Vera s/n
46022 València, Spain

K.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


The purpose of this work is to overview the results provided by the simulation of a counterpart experiment reproducing an Intermediate Break Loss-Of-Coolant Accident (IBLOCA) at the ATLAS and LSTF integral test facilities, using the thermal-hydraulic code TRACE5 patch 5 and the Symbolic Nuclear Analysis Packages software (SNAP) version 2.6.8.

The scenario simulates a 13% cold leg IBLOCA under the assumption of the full High-Pressure and Low-Pressure Injections, and the total failure of the Auxiliary Feedwater.

The simulation results are compared with the available data of the A5.2 and IB-CL-05 tests, in the OECD-ATLAS and OECD/NEA ROSA-2 projects, respectively, to evaluate the prediction capabilities of TRACE5 and clarify the causes of the major differences between the transients. Furthermore, these results represent a contribution to assess the predictability of computer codes such as TRACE5.

Page Last Reviewed/Updated Thursday, September 07, 2023