Assessment Against ACHILLES Reflood Experiment with TRACE V5.0 Patch3 (NUREG/IA-0441)

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Publication Information

Manuscript Completed: November 2013
Date Published: February 2014

Prepared by:
O. A. Berar, A. Prošek

Jožef Stefan Institute
Jamova cesta 39
Sl-1000 Ljubljana, Slovenia

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:
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

At present time, the development of the U.S. Nuclear Regulatory Commission RELAP5 has been ceased in favor of the newer TRACE best estimate system code. The present work presents the assessment of the Achilles natural reflood experiment with the TRACE V5.0 Patch 3. In addition, comparison calculations with TRACE V5.0 Patch 1 and latest RELAP5/MOD3.3 Patch 4 were performed. The TRACE input deck has been obtained by conversion of the already existing RELAP5 input deck. The calculated results were compared against the experimental data. The results show that both TRACE and RELAP5 are capable of reproducing the reflood phenomena at a satisfactory level. However, some discrepancies between the predicted variables and the experimental data suggest further investigation of the TRACE reflood model.