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Assessing the impact of modeling assumptions on steady-state thermal-hydraulic safety margins in research reactors: The OPAL case
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DOI：10.1016/j.pnucene.2026.106493.png)
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Abstract
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• Steady-state thermal-hydraulic behavior of OPAL was analyzed using RELAP5/Mod3.2, PARET/v7.6, and PLTEMP/v4.3. • Agreement of RELAP5 and PARET predictions at two operating points (14 MW and 18 MW) assessed using relative error and FFTBM metrics. • Fuel, cladding, and coolant temperatures agree within 2.5% across the three codes. • ONBR, OFIR, and CHFR minimum values show consistent and conservative safety margins, with deviations below 8%. • Results provide a robust reference basis for future transient scenarios and coupled neutronic–thermal-hydraulic analyses.
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