Safety analysis of the IAEA reference research reactor during loss of flow accident using the code MERSAT |
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| Authors: | A. Hainoun N. Ghazi |
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| Affiliation: | a Department of Nuclear Engineering, Atomic Energy Commission of Syria (AECS), P.O. Box 6091, 17th Nissan Street, Kafersouseh, Damascus, Syria
b National Atomic Energy Commission (NATEC), P.O. Box 4720, Sana’a, Yemen |
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| Abstract: | Using the thermal hydraulic code MERSAT detailed model including primary and secondary loop was developed for the IAEA's reference research reactor MTR 10 MW. The developed model enables the simulation of expected neutronic and thermal hydraulic phenomena during normal operation, reactivity and loss of flow accidents.Two different loss of flow accident (LOFA) have been simulated using slow and fast decrease time of core mass flow. In both cases the expected flow reversal from downward forced to upward natural circulation has been successfully simulated. The results indicate that in both accidents the limit of onset of subcooled boiling was not arrived and consequently no exceed of design limits in term of thermal hydraulic instability or DNB is observed. Finally, the simulation results show good agreement with previous international benchmark analyses accomplished with other qualified channel and thermal hydraulic system codes. |
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| Keywords: | LOFA, loss of flow accident HEU, highly enriched uranium LEU, low enriched uranium MERSAT, (Model for Evaluation of Reactor Safety and Analysis of Thermal hydraulic) DNB, departure from nucleate boiling DBAs, design basis accidents MTR, material testing reactor SFE, standard fuel element CFE, control fuel element SS, steady state PIEs, postulated initiating events SLOFA, slow loss of flow accident FLOFA, fast loss of flow accident HTC, heat transfer coefficients IAEA, International Atomic Energy Agency AECS, Atomic Energy Commission of Syria UPISA, University of PISA (Italy) ANL, Argonne National Laboratory (USA) LAS, Laboratoire d&rsquo Analyse de Sû reté (Algeria) JEN, Junta de Energia Nuclear (Spain) JAERI, Japan Atomic Energy Research Institute (Japan) |
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