Assessment of NEPTUN Reflooding Experiments 5050 and 5052 with TRACE V5.0 Patch 5 (NUREG/IA-0495)

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Publication Information

Manuscript Completed: December 2017
Date Published: February 2019

Prepared by:
S. Hillberg

VTT Technical Research Centre of Finland Ltd
P.O. Box 1000
FI-02044 VTT, Finland

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


NEPTUN experiments 5050 and 5052 have been simulated with TRACE V5.0 Patch 5. Calculation results were compared to experiment data received from OECD/NEA databank but, unfortunately, not all original experiment data was available. Uncertainties of the experimental data were not quantified in the original material nor were there enough available data in order to form an estimate. There is also uncertainly about radial placement of those thermocouples for which data is available.

Both simulations show qualitatively similar results: TRACE predicts higher temperature in the lower parts of the test section which leads to later quenching than in the experiment. In higher elevations temperatures are a closer match but there is still a significant difference in quenching times. Collapsed water level prediction is in reasonably good agreement in both experiments.

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